JPH09176773A - Cermet alloy vanes - Google Patents

Abstract

(57) [Abstract] [Purpose] It has sufficient self-abrasion resistance and is suitable for HFC-based CFCs as an alternative refrigerant. It has low vane mating material attacking property, low friction coefficient, and self-lubricating property. Provided is a cermet alloy vane which has high corrosion resistance and is sufficiently resistant to the corrosive action of acids such as carboxylic acids generated by decomposition of ester-based lubricating oil. [Structure] Ni alone or Ni and Co as main components (however, N
5% to 20% by weight, where i is 50% or more by weight%)
, A hard phase having a double core structure composed of a core particle (core) mainly composed of a carbide or a nitride of Ti or a mutual solid solution compound thereof and the surrounding structure, and inevitable impurities. And the hard phase is wt%, Ti: 30 to 60%, W: 10 to 30%, and Mo: 0.5.
-10% and at least one or more of Ta, Nb, Cr, V, Zr, and Al in total: 1-25%, N:
2 to 6% and C: 4 to 12%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cermet alloy vane suitable for a vane of a rotary compressor used in a refrigerating and refrigerating device or an air conditioner using a CFC substitute refrigerant.

[0002]

2. Description of the Related Art FIG. 1 is a schematic cross-sectional view of a rotary compressor mounted in a conventional refrigerating and refrigerating apparatus or an air conditioner in which the cermet alloy vane of the present invention can be used. Reference numeral 1 is a rotary compressor, 2 is a condenser, 3 is a capillary tube as a decompression device, and 4 is an evaporator, which are sequentially connected to form a refrigeration cycle. A cylinder 6 is welded and fixed to the closed container 5 of the rotary compressor 1. A vane 7 is inserted into the vane groove 8 of the cylinder 6. Reference numeral 9 denotes a piston, which is fitted into the eccentric portion 21 of the shaft 10 and rotates eccentrically along the inner wall of the cylinder 6 when rotating about the rotation center 20 of the shaft 10. The vane 7 contacts the piston 9 to separate the inside of the cylinder 6 into the suction chamber 11 and the compression chamber 12, and reciprocates in the vane groove 8 according to the movement of the piston 9. The inside of the closed container 5 has a high pressure, and the tip of the vane 7 is pressed against the outer circumference of the piston 9 against the pressure difference between the inside and the outside of the cylinder 6 by the spring force of the vane spring 13.

Conventionally, fluorocarbon has been used as the gas as the refrigerant. Consider the requirements for the compressor to maintain good operation continuously. Since the tip of the vane always slides in close contact with the outer periphery of the piston 9 and the side surface of the vane with the cylinder 6, the characteristics required for the vane are that the vane itself does not wear, that is, the self-wear is small, and The piston and cylinder are not worn, that is, the attacking property of the mating material is low. In order to improve lubricity, the compressor is conventionally filled with, for example, an alkylbenzene-based lubricating oil that is compatible with CFC gas. In order to continuously maintain a good operating condition in such a lubricating environment, it is necessary that the vane and the piston are compatible with each other and have high lubricity. Therefore, it is important that the coefficient of friction between the vane and the piston is low. If this friction coefficient is high, not only is the self-lubricating property poor, but in ester-based lubricating oils used with CFC substitute refrigerants, the temperature of the lubricating oil rises and carboxylic acid is generated, which causes corrosive wear on the vane material. There can be problems.

Conventionally, SKH51 has been used for such vanes.
The corresponding molten high-speed tool steel or Fe-based sintered material has been mainly used. In some cases, carbon is used with emphasis on the attacking property of the mating material, or when it is necessary to emphasize wear resistance in a high-power type, ceramics such as Al ₂ O ₃ and SiC may be used. It was For the purpose of improving the wear resistance and self-lubricating property of the vane, regarding the material surface of the vane, JP-A-56-47550 and JP-A-61-485.
56, JP-A-64-35091 and JP-A-2-102.
What is described in each publication of No. 392 is proposed. More recently, a vane has been proposed in which a hard coating layer such as a Ni—P plating layer or a Ni—P plating layer in which fluorine resin particles are dispersed is formed on the surface of a base material of Al or high speed tool steel. Among them, those using Al as a base material are disclosed in JP-A-64-32087 and JP-A-3-186.
No. 82, and Japanese Patent Laid-Open No. 06-033256 discloses high-speed tool steel as a base material.

[0005]

The refrigerant used in the compressor is a chlorofluorocarbon (hereinafter referred to as CFC) -based so-called specific chlorofluorocarbon, especially two Cl atoms as shown in the chemical structural formula of Chemical formula 1. A specific CFC called CFC-12 is mainly used. When this CFC-based chlorofluorocarbon reaches the stratum, it is exposed to ultraviolet rays and decomposes to release chlorine (Cl), thereby destroying the ozone layer. For this reason, it has been internationally decided by the Montreal Protocol that CFC-based CFCs will be completely abolished by the year 2004, and the development of refrigerants to replace them is underway. Among these, as alternative refrigerants, in addition to hydrofluorocarbon (hereinafter referred to as HFC) -based CFCs containing no chlorine, such as HFC-134a shown in the chemical structural formula of Chemical formula 2,
A few HFC mixed refrigerants have been developed. As the mixed refrigerant, R407C (HFC-32, 125, 13
4a 3 types mixed) and R410A (HFC-32, 1
25 is the most promising. The ozone depletion potential of these refrigerants is zero.

[0006]

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However, the use of HFC-based CFCs in vane pumps and rotary compressors has the following problems as compared with the conventional CFC-based CFCs. 1)
Since it does not contain chlorine, the lubricity of the refrigerant is poor. 2) The hygroscopicity of the refrigerant is great. 3) Alkylbenzene-based lubricating oils used for CFC-based CFCs cannot be used because they are not compatible with HFC-based CFCs. Therefore, compatible ester-based lubricating oils are mainly used. However, ester-based oils have poor lubricity and high hygroscopicity, and therefore hydrolyze to form carboxylic acid, which causes adverse effects such as corrosive wear. There are cases. And 4) the compression ratio needs to be high, so the load on the vanes is large.

Considering the above problems, the requirements that the vane should have when using HFC type CFC as an alternative CFC will be summarized again. First of all, it is a material with higher wear resistance than before due to high load (self-wear resistance),
Next, in order to operate permanently without causing seizure or galling in a low lubricity environment, the compatibility between the vane and piston is high (the vane mating material has low aggression property), and therefore the friction coefficient is low. Examples of such materials include high self-lubricating properties, and materials that sufficiently withstand the corrosive action of acids such as carboxylic acids generated by the decomposition of ester-based lubricating oil (corrosion resistance). In this regard, it has been proved that, when HFC-based CFCs are used, vanes made of conventional high-speed tool steel and Fe-based sintered material have excessive wear due to sliding with the piston, and eventually cause abnormal wear. Therefore, it cannot be put to practical use. In addition, ceramics have problems because they are too aggressive against other materials. The weak point of carbon is that it has large self-wear and is brittle in strength. Further, those coated with a hard layer such as the above-mentioned Ni-P plated layer have not solved the problem of reliability in peeling resistance.

Recently, in comparison with such conventional vane material, H
A vane coated with a hard layer has been tested by physically or chemically vapor-depositing Ti or Cr nitride or the like using a high-speed tool steel as a base material for FC-based CFCs. This type of vane has relatively good characteristics, but since it is a coating, the reliability finally becomes a problem in terms of peeling resistance, and it has not been adopted practically. As described above, the vanes that have been practically used in the case of the conventional CFC-based chlorofluorocarbon or the vanes that have been studied for the HFC-based chlorofluorocarbon, and those that have been known so far are shown in Table 1.
As shown in (1), except for the cermet vanes of the present invention, they have all advantages and disadvantages, and practically satisfactory ones have not been found.

[0010]

[Table 1]

An object of the present invention is to use a material having a high wear resistance that can withstand high loads, that is, a material having a high wear resistance, that is, a material that is sufficiently practical and suitable for an HFC-based CFC as an alternative refrigerant, that is, seizure under a low lubricity environment. Since the vanes and pistons are highly compatible with each other so that they operate permanently without causing galling, the opponent material attack of the vanes is low, and therefore the coefficient of friction is low, self-lubrication is high, and ester-based lubricating oil A vane made of a cermet alloy, which is a material having a corrosion resistance sufficient to withstand a corrosive action caused by an acid such as a carboxylic acid generated by decomposition.

[0012]

DISCLOSURE OF THE INVENTION The present inventors have contradictory characteristics among the various characteristics required when using HFC-based CFCs, that is, the wear of the vane itself is small without causing wear of the piston as the mating material. In order to satisfy all of the above requirements, the corrosion resistance is good, there is no risk of sudden peeling of the surface layer even during long-term operation, and the reliability is ensured. It has been found that a cermet alloy containing a hard phase having a uniform and fine specific particle size and a binder phase rich in Ni is suitable. As shown in FIG. 2, the structure of the cermet alloy is a hard phase having a double core structure composed of core particles (core) made of carbonitride of Ti and its surrounding structure, and a binder phase mainly composed of Ni or Co. It has a delicate balance between wear resistance and toughness. Further, it can be used as a material for a cutting tool even in a field requiring wear resistance and toughness (particularly thermal shock resistance) particularly in a high-speed cutting region.

That is, the present invention is directed to Ni alone or Ni and Co.
A binder phase containing 5 to 20% by weight, the main component of which is Ni and the proportion of Ni in Co is 50% or more by weight,
A cermet composed of a hard phase having a double core structure composed of a core particle (core) mainly composed of a carbide or a nitride of Ti or a mutual solid solution compound thereof and the surrounding structure, and an unavoidable impurity. Alloys, wherein the hard phases are each 30% by weight, Ti: 30 to 60%,
W: 10 to 30%, Mo: 0.5 to 10%, Ta,
At least one kind or plural kinds of Nb, Cr, V, Zr, and Al are combined: 1 to 25%, and N (nitrogen): 2 to 6
%, C (carbon): 4 to 12%, and in a hard phase having a double core structure and uniformly dispersed in the matrix, the average particle diameter of the core particles is 1.5 μm or less. The cermet alloy vane has a maximum particle diameter of 5 μm or less.

Function: In the compressor using HFC type CFC, as described above, low lubricity, high load operation,
There are adverse conditions such as the risk of corrosive wear due to the formation of carboxylic acids. Therefore, in the present invention, the vane member has wear resistance and corrosion resistance comparable to that of ceramics, and the mating material has a high degree of self-lubricity with attackability comparable to carbon, and is not brittle like ceramics and carbon and has sufficient strength next to high-speed tool steel A nitride-containing cermet alloy was used as one having Further, in the present invention, wear resistance equivalent to that of ceramics is obtained by using a carbide of Ti for the hard phase core portion. In addition, by including Ti nitride or carbonitride in the hard phase, the friction coefficient is reduced, self-lubrication is enhanced, and the aggressiveness of the mating material is mitigated. Furthermore, the hard phase particles fall off and damage the mating material. In order to prevent the wear of the vane itself, or to promote the wear of the vane itself, the particle size is defined in a uniform and fine specific range,
Corrosion resistance was addressed by using a binder phase rich in Ni.

Preferably, the Ta, Nb, Cr, V,
Al in Zr and Al is 0.5 to 3%, Ta, Nb,
By setting at least one kind or a plurality of kinds among Cr, V, and Zr to 0.5 to 22% in total, the amount of Al was specified with particular emphasis on the mitigation of the aggressiveness of the partner material. And Ni
Singly or in the binder phase mainly composed of Ni and Co,
There is an intermetallic compound formed on the Ni-Al binary system equilibrium diagram, and a metal formed on the Ti-Al binary system equilibrium diagram accompanying the hard phase having the double core structure. By using the cermet alloy vane in which the interstitial compound is present, the effect of mitigating the aggressiveness of the mating material was made more reliable. In addition, by crystallization or precipitation of free carbon in the cermet alloy, the coefficient of friction is significantly reduced, self-lubrication is improved, and the temperature rise of the lubricating oil is prevented, so that carboxylic acid is generated. A cermet alloy vane was used for suppressing.

The knowledge to apply the cermet alloy having such wear resistance property to the vane member will be shown below. As mentioned above, a material that satisfies all the basic characteristics (wear resistance, low attack of the mating material, friction coefficient, corrosion resistance, peel resistance) as a vane member under the CFC alternative environment has been found so far. Not not. As can be seen from Table 1, CrN is PV
D-coated vane members have reached a certain level except for reliability in peel resistance. However, considering that peeling resistance is a problem that occurs because it is a coating, it was thought that a bulk material consisting only of nitride would be good. Was an issue because it was too large. Therefore, the present inventors comprehensively judged these matters, and found that a cermet alloy containing Ti carbonitride having high self-lubricating property as a hard phase and a suitable amount of a metal mainly composed of Ni having high corrosion resistance was a vane member. It came to the idea that it is suitable as.

Further, in the friction-wear characteristics in the low friction speed range as in the present case, mechanical fracture wear and adhesive wear are the main components, whereas conventional cermet alloys for cutting are used for medium and high speed cutting. Because the alloy composition is suitable for
It has been found that when such a vane member is used, hard phase loss and bond metal adhesion occur, and thus sufficient wear resistance cannot always be obtained. Therefore, as a result of intensive studies on the application of the cermet alloy to the vane member, the present inventors have found that a hard phase containing a carbonitride of Ti and having a uniform fine particle size, and a binder phase rich in Ni. It has been surprisingly found that by adding an appropriate amount of Al to a cermet alloy having γ, a epoch-making effect can be obtained for preventing the hard phase particles from falling off and improving the adhesion resistance of the binder phase metal. As a result of further various experiments, a vane member suitable for a rotary compressor using the above-mentioned CFC alternative of the present invention as a refrigerant was found.

The action of each element and the reason for limiting the numerical values in the present invention will be described below. 1). Amount of binder phase: The amount of binder phase is an amount corresponding to the amount of hard phase, and sets the balance between wear resistance and toughness of the alloy.
If the amount of the binder phase is less than 5%, it tends to be unsintered, and even if it is sintered, the hardness becomes too high, and the mating material aggression becomes excessive, which is not suitable. If the amount of the binder phase exceeds 20%, the hardness becomes low, so that the wear resistance is lowered, and in some cases, the binder phase metal is adhered to cause baking. For this reason, the amount of binder phase is set to 5 to 20%. 2). Binder phase composition: The strength and corrosion resistance of cermet alloys are greatly influenced by the binder phase. W, Mo, Ta, Nb, Cr
Such a carbide forms a solid solution in Co and causes strain hardening. Then, it affects the plastic deformability of the binder phase and contributes to the improvement of strength. Co is corroded by acid, but Ni is hardly corroded. Therefore, when the proportion of Ni in Ni and Co in the binder phase is less than 50%, the influence of corrosion by carboxylic acid is large, and Ni is not practically used. Since a problem arises, the lower limit of the Ni content is defined as 50%.

3). Ti: Exists mainly in the hard phase together with C and N as titanium carbide, titanium carbonitride, and titanium nitride, of which titanium carbide and titanium carbonitride have the function of enhancing wear resistance, and titanium nitride The titanium carbonitride has the function of enhancing the self-lubricating property and the function of refining the hard phase in the alloy structure. If Ti is less than 30%, the wear resistance is insufficient, and if it exceeds 60%, the alloy becomes brittle and the attacking property of the mating material becomes large. Therefore, the Ti component range is 30
-60%. 4). W: W is a component that strengthens the binder phase together with the refinement of the hard phase and secures the strength of the alloy. If W is less than 10%, the alloy becomes brittle. Further, when it exceeds 30%, phenomena such as precipitation of intermediate compounds as low-order carbides occur and the alloy strength decreases. Therefore, W is set to 10 to 30%. 5). Mo: Mo existing in the hard phase has the function of uniformly refining the hard phase, enhancing the strength of the alloy, and improving the sinterability to improve the bonding strength between the hard phase particles and the binder phase. And plays the role of preventing particles from falling off during sliding friction. If Mo is less than 0.5%, the above effect cannot be obtained, and if it exceeds 10%, the surrounding structure becomes too thick and the hard phase becomes brittle and particles fall off.
0%.

5). Ta, Nb, Cr, V, Zr, Al:
These metal elements form a composite carbonitride together with Ti, Mo and W, or form an intermetallic compound to strengthen the alloy,
It acts to improve plastic deformation resistance and heat resistance.
Of these, Ta and Nb mainly contribute to heat resistance and oxidation resistance, and Cr mainly contributes to improvement of corrosion resistance and plastic deformation resistance. If the content of these elements is less than 1%, the above effect does not occur, and if it exceeds 25%, the element becomes rather brittle. Therefore, it is set to 1 to 25%. 6). Al: Al dissolves in the hard phase and the binder phase,
It has the effect of increasing the sinterability of the alloy, improving the bonding strength between the hard phase and the binder phase, and preventing the hard phase particles from falling off on the sliding surface. Further, as shown in FIG. 3 and FIG. 4, when the solid solution limit in the hard phase and the binder phase is exceeded, the intermetallic compound (for example, TiA) on the Ti--Al phase diagram is exceeded in the hard phase.
l _3, to form a TiAl, etc.) contributes to the improvement of wear resistance, in the binding phase acts as a precipitation strengthening element formed intermetallic compounds diagram NiAl phase (e.g. NiAl _3, NiAl, etc.) However, it has an effect of imparting a great resistance to adhesive wear that is likely to occur in the low friction velocity range as in the present case. A
If the amount of l is less than 0.5%, intermetallic compounds sufficient to obtain the above effects are not sufficiently formed, and if it exceeds 3%, the amount of intermetallic compounds formed is too large and the binder phase becomes brittle. Al
The range of the component was 0.5 to 3%.

9). C (carbon): C is the hard phase forming element (Ti, Mo, W, Ta, Nb, Cr, V, Zr, A).
l) forms a hard carbide or carbonitride with the effect of increasing wear resistance and reducing galling. Therefore, the C content is determined in consideration of the content of the hard phase forming element, but when it is present in excess, it is crystallized or precipitated as free carbon, which contributes to the reduction of the friction coefficient. If C is less than 4%, a brittle intermetallic compound is formed as a low-order carbide and the alloy deteriorates. On the other hand, if it exceeds 12%, the precipitated free carbon becomes abrasion powder and the other material is damaged. From the above, the component range of C is set to 4 to 12%. 10). N (nitrogen): N mainly exists in the form of nitride or carbonitride of Ti and has a refining effect on hard phase particles. In addition, the toughness of the nitride enhances the toughness and at the same time has the effect of improving the self-lubricating property. If N is less than 2%, the hard phase particles do not have a sufficient refining effect and the self-lubricating property is poor, so that the particles fall off during sliding, causing wear marks on the piston. If N exceeds 6%, the hardness of the hard phase becomes low and the wear resistance becomes poor. From the above, the N component range was set to 2 to 6%. 11). Particle diameter of core particles in the hard phase: The sliding state of the vane in the rotary compressor as in the present case is considered to be the friction-wear characteristic in the so-called low friction velocity range. Therefore, the wear mode is mechanical fracture wear,
Adhesive wear, abrasive wear, and scrape wear can be considered. In this case, the abrasive wear is mainly due to the hard phase particles falling off. This is due to the binding force of both the hard phase and the binding phase and the brittleness of the hard phase itself. This can be solved by suppressing the particle size as well as the effect of adding Al. From the above, the hard phase core particles have an average particle diameter of 1.5 μm or less and a maximum particle diameter of 5
It was defined as μm or less.

[0022]

Examples of the present invention will be shown below. 20 types of base materials for vanes shown in Table 2 were prepared. Among them, the cermet alloys of No. A to No. I which are the vanes of the present invention and the cermet alloys of No. J to No. N which are the comparative vanes include carbides, nitrides, carbonitrides, metal components, etc. The raw material powder was wet mixed and pulverized with a ball mill, granulated with a spray dryer, shaped into a shape close to a vane (near net shape) with a press, and sintered at 1400 ° C. in a vacuum furnace to obtain a product. It was ground with a diamond grindstone and used as a finished vane. No. O was a conventional smelting high-speed tool steel SKH51, and a steel ingot melted and ingot in the atmosphere was made into a rectangular steel by hot forging, hot rolling and cold drawing, and used after being heat treated and ground. No. P and No. Q are commercial Al
₂ O ₃ based ceramics and Al-impregnated carbon were ground and used as vanes. No. R is No. O high-speed tool steel SKH
51 was coated with CrN in a PVD coating of 5 to 10 μm. Similarly, for No. S, the SKH51 plated with Ni-P was used. No. T was used by grinding a material obtained by near-net-shape forming a Fe-Cr-based raw material powder, sintering it in a vacuum furnace, and then annealing and heat-treating it.

[0023]

[Table 2]

The wear test was carried out as follows.
Meehanite cast iron equivalent to piston material (nickel,
A chrome and molybdenum-added material) was rotated as a disk, and the completed vanes were pressed against each other and slid against each other, and the wear amount and friction coefficient were measured.
At this time, the liquid tank was filled with a polyol ester oil in which HFC134a, which is a representative of HFC-based CFCs, was filled, and the test was performed while the sliding parts of the 20 kinds of vanes and disks shown in Table 2 were completely immersed in this oil. Was carried out. The sliding conditions were a pressing load of 150 kgf, an oil temperature of 110 ° C, and a rotation speed of 1 m / s. Table 3 shows the results.

[0025]

[Table 3]

The vane material of the present invention is a cermet alloy of No. A to No. I, in which No. A to No. G are sound phase alloys, and No. H and No. I are crystallization of free carbon. Or, it is deposited. As for the sliding characteristics in the presence of HFC-based CFCs, the vane materials of No. A to No. G are No. O (high speed tool steel) which is mainly used in the presence of CFC-based CFCs.
It can be seen that the wear resistance is significantly better than that of No. T (Fe-based sintered material) and the friction coefficient is also excellent. Also N
It can be seen that o. H and No. I are the effects of free carbon, and the friction coefficient is lower than the No. R coated product, and it is superior in terms of the attacking property of the mating material. However, the vane material No. J, in which the amount of the binder phase exceeded the limit value, had significantly poor wear resistance,
It can be seen that the vane material K with C% exceeding the limit value has significantly deteriorated the attacking property of the mating material due to abrasion powder. Further, the vane material No. No. L in which the hard phase particle diameter exceeds the limit value is excessively worn due to the particles falling off. In addition, vane material No. M containing no Al is inferior to the vane of the present invention in both self-wearing and aggressiveness of the mating material, and vane material No. N in which the amount of Al added exceeds the limit value has these characteristics. It can be seen that it is getting worse. The above effect can be similarly obtained by using cast iron in which a large amount of phosphorus is added to crystallize steadite, cast iron in which boron is added, cast iron by continuous casting, or the like.

[0027]

As described above, the vane of the present invention is
Carbide or nitride or carbonitride of titanium is dispersed uniformly and finely as a hard phase, and by balancing the composition of the binder phase, it not only enhances self-lubricating property and suppresses galling with piston and cylinder, but also HFC type. It has sufficient corrosion resistance against erosion and wear due to carboxylic acid generated by the decomposition of fluorocarbon lubricating oil, and is more reliable in terms of peeling resistance compared to hard phase coated products, etc. It has outstanding superiority and is highly practical and suitable for HFC-based CFCs as an alternative refrigerant. It has a high wear resistance material that withstands high loads, that is, self-wear resistance, and is baked in a low lubrication environment. Since the vane and piston are highly compatible with each other so that they can operate permanently without causing galling, the mating material of the vane is low, and therefore the coefficient of friction is low, self-lubrication is high, and ester-based Lubricating oil became shall provide cermet alloy vanes is a material having a sufficient withstand corrosion resistance corrosive action by acid such as carboxylic acid generated by decomposition. It is the only vane material currently available for use as an alternative refrigerant for HFC-based CFCs. Therefore, by using the cermet alloy vane of the present invention, it has become possible to put the compressor into practical use that uses alternative CFCs as a refrigerant in compliance with environmental regulations.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a rotary compressor mounted in a conventional refrigerating and refrigerating apparatus or an air conditioner in which the cermet alloy vane of the present invention can be used.

FIG. 2 is a schematic diagram showing an alloy structure of a cermet alloy vane of the present invention.

FIG. 3 is a Ti-Al binary system equilibrium diagram.

FIG. 4 is a Ni-Al binary system equilibrium diagram.

[Explanation of symbols]

 1. . . Rotary compressor 7. . . Vane (Cermet alloy vane) 9. . . Ston

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masao Koshi, Inventor Masakoshi Koshi 1-1 1-1, Fujikoshi Honcho, Toyama City, Toyama Prefecture (72) Inventor Hideo Hirano 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. Co., Ltd. (72) Inventor Hiroyuki Kono 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Hirotsugu Fukuoka, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A binder phase containing 5% to 20% by weight of Ni alone or a main component of Ni and Co, and a proportion of Ni of Ni and Co of 50% or more by weight, and a balance of Ti carbide. Alternatively, a hard phase having a double core structure composed of core particles (core) containing nitride or a mutual solid solution compound thereof as a main component and a peripheral structure thereof, and inevitable impurities,
A cermet alloy consisting of, wherein the hard phases are respectively in weight%, Ti: 30 to 60% and W: 10 to 30%.
And Mo: 0.5 to 10%, Ta, Nb, Cr, V,
At least one kind or a plurality of kinds of Zr and Al are combined: 1 to 25%, N (nitrogen): 2 to 6%, and C (carbon): 4 to 12%, and In a hard phase having a double core structure uniformly dispersed in a matrix, the core particles have an average particle diameter of 1.5 μm or less and a maximum particle diameter of 5
A vane made of a cermet alloy characterized by having a size of not more than μm. 2. The Ta, Nb, Cr, V, Zr and Al
Al in 0.5 to 3%, Ta, Nb, Cr, V, Z
0.5 to at least one of r
The cermet alloy vane according to claim 1, which is 22%. 3. An intermetallic compound formed on a Ni-Al binary binary equilibrium diagram is present in the binder phase containing Ni alone or Ni and Co as main components, and the double core structure is formed. The cermet alloy vane according to claim 1 or 2, wherein an intermetallic compound formed on the Ti-Al binary binary equilibrium diagram is present in association with the hard phase. 4. The cermet alloy vane according to claim 1, wherein free carbon is crystallized or precipitated in the cermet alloy.