JPS5981002A - Coating tool and its manufacturing method - Google Patents

Abstract

PURPOSE:To prolong the life of a tool by improving resistance against fused deposition and wear by directly forming an aluminium oxide coating layer over the tool surface at temperature lower than that of a specific coating reaction. CONSTITUTION:An aluminum oxide coating layer is directly formed over the tool surface at temperature lower than the coating reaction temperature of 400 deg.C by a chemical vacuum evaporation method. A host material is oxidized at reaction temperature over 400 deg.C, and a decarburized layer is formed between the host material and the coating layer, resulting in the reduction of an adhesive property. Upon performing the chemical vacuum evaporation, at least one kind of diethyl aluminium chloride, triethylaluminium chloride, triethylaluminium, and ethyl aluminium dichloride is used, and a mixture of hydrogen gas and methane gas is used as carrier gas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coated tool made of cemented carbide, special steel, etc. that is protected by a coating layer that has extremely high welding properties and extremely high wear resistance f1 and toughness. be.

One or two of the groups IV8, VA, and VIA of the periodic table (V).

-1- Super hard alloy consisting of carbides and/or nitrides of transition metal elements]2 tools, special steel]-tools, etc.
) titanium carbide; ii) titanium nitride; 111) aluminum oxide;
Single layer or double layer consisting of one or two types of nitrides and oxides,
Coated super hard alloy tools and coated special steel tools coated with double layers and multiple layers to increase durability and durability are widely known and have already been widely used.

In general, in order to coat aluminum oxide on the surface of two-legged cemented carbide tools and special wII-tools, A (CC
i+ l-12,v Su,, C02h' Suwo suitably (
7? :, adjust the partial pressure to 10-4 to 10-' atmosphere, introduce it into the reactor, and heat it to 950' (: ~1050°
It is known that it is sufficient to maintain the temperature at C for an appropriate period of time. Its chemical formula is: 2A f, Ce 3+ 311,0→A Q 20
3+ G II C (l).

Is it possible to use this manufacturing method to directly form an aluminum oxide layer on the surface of the tool to provide a single layer coating?
Translation (1) Because it is necessary to carry out the process at a high temperature of about 1'C, whether the material is ultra-hard alloy or special steel, ljJ
There is a problem in that the surface of the ashes is surfaced, a significant decarburized layer is formed, and the coating becomes less than one layer thick, making it impossible to put it to practical use.

, 2, in the past, a titanium carbide layer was first formed on the tool surface to protect the base material, and then an acid-ratio aluminum layer was formed using the method described in 1. This is a commonly used method of forming.

In the conventional process, an oxidizing atmosphere at a high temperature of (+)I o o n °Crfiff& has a significant adverse effect on the 1:J phase.

(2) For this reason, it is necessary to perform hair coating and skin iL coating to protect the R upper material, which is essentially meaningless, and the economic loss is 1. avoidable.

(:)) Since a coating atmosphere of at least 2 JT+ must be generated in the same reactor, time and wasteful gas flow are required for gas replacement.

(4) li) Since the reaction temperature is close to the material limit of the material, in actual mass production, the reaction temperature must be set at the lower limit of 11F, resulting in poor yield and unstable quality.

(5) It requires a carrier gas of high purity and is extremely expensive, creating a cost bottleneck.

Due to these problems, it becomes a major cost increase factor, the quality of the product becomes unstable, and the price is extremely high11. Therefore, it can be considered as f-komono.

The present inventors conducted research χ in order to solve the conventional problems described in -1-
As a result of repeated experiments, the present invention was completed.

The first object of the present invention is to coat the aluminum oxide coating directly onto the base material without causing any negative factors to the base material. To present the ingredients.

The second object of the present invention is to provide a method for manufacturing a coated tool that can be inexpensively and easily applied, and that can guarantee stable quality at a mass production level. .

The first feature of the present invention is that according to the present invention, the degree of coverage is 1.
This is achieved by setting the odor to 100°C or below. Namely 1. -1. (A coating reaction temperature of 1ζ that exceeds 110°C will lead to oxidation of the lit material, and
A 111L carbon layer is formed between the material and the coating layer, and the adhesion of the coating layer deteriorates, causing the coating layer to become brittle.

The second aspect of the present invention [1] is diethyl aluminum chloride l
, (C:II,)=AfCf is reacted in a reactor using a mixed gas of hydrogen gas and methane gas, and the surface of the ultra-hard alloy is coated with an aluminum oxide layer by chemical vapor deposition. By doing this, the basic (this is achieved).

1. Triethylaluminum (C
, II, ) 3A (+, Ethyl aluminum 11 tsukuroid ((2, 1(5) l'cf2, etc.).

As reaction IJi, aluminum oxide 1 is produced using the conventional process.
．． 11, blasphemy, it is possible to use the same chemical vapor reactor used to form the coating.
A simple dedicated reactor that does not require a high-temperature resistant structure may be used.

These compounds used in the present invention have already been mass-produced as polymerization catalysts and have been used in industrial standards (historically).

The characteristics are: (a) Low boiling point 2 +111 ``C0 (b) Low decomposition point 3 +, 10 'C0 Therefore, the reaction is performed at low temperature, -
Since the reaction rate is somewhat slow and the temperature is low, there is no influence on the quality -1-, and the same effect as the reaction at high temperature in the conventional process can be obtained.

In the conventional process, reaction-1 requires 4 (J1 degrees 1'
1 required around + 00 + 1 'C,
In this process, 31) IJ °C ~ 40 (PiC is sufficient
] You can hit the target and get the following benefits.

(1) Even if the reaction occurs at a low temperature, once the coating is applied, the coating layer is completely the same as the coating at a high temperature, and is uniform and coated.
layer is obtained.

(2) Coating at low temperatures is a conventional process C.11. 11. Completely prevent the negative impact on the lumber, which was the country's fortune. I can do it. Therefore, there is a risk of oxidation and decarburization of the 1i upper material, and the coating layer adheres to the fil material, eliminating the peeling of the coating layer and brittleness, which are the drawbacks of the conventional process.

(3) Super hard alloy cutting tip (throw-away tip)
Not only that, but it can also be applied to wear-resistant tools made of cemented carbide.It should be noted that the conventional process
When coating γ-wearing tools (extremely durable), it is difficult to use because the steel reinforcement parts (the outside of the firing have returned) due to the high temperature, so it is difficult to coat the IL-finished products. Is it possible to coat only the carbide part and re-make it made of steel after it gets sticky? In this case, the super-historical alloy deforms to some extent during joining, making it possible to use it industrially in fields where it can be expected to be most effective, such as press molds. However, in this process,
Steel reinforcement ヰ7 (Returning temperature r = l: J, because the coating deteriorates under 11, it becomes possible for the first time to coat the carbide part and the steel part at the same time, and the carbide part and the steel part) (The material does not change in quality at all, and it can be used as is without any change in shape or size.)

(4) Special steel tools (when coating all steel products such as drilling parts and their ponds, conventional C, V, D
, process 1. Reaction i, 'A 1% Cato
Since the temperature was around 0°C, the hardening of the mother H was completely reversed, and it was necessary to re-harden it in a vacuum furnace after the coating process. Since distortion, deformation, etc. inevitably occur during the hardening process, corrections such as straightening and bending must be performed, resulting in the complexity of correction means, the limits of correction, and the technical difficulty of correction. These problems made the cost of the product extremely high, and the range of application of coated products was extremely narrow due to technical and price constraints. However, low-temperature coating using the process of the present invention , v The quenching condition of the top steel is not affected at all, so there is no need for processes such as re-quenching and straightening.1) The problems of the conventional process are solved at once.
The effects are immeasurable, and it is thought that the price will be reduced to a fraction of the conventional price.
Coach ink is used for steel tools and parts.
expected to expand.

(5) The reaction temperature must be 1 degree Celsius; directly, the heat flux is low; indirectly, it requires a high temperature; If we develop a specialized furnace for the horn method of the present invention, which does not require a furnace material, it will be possible with a simple device, and compared to the current expensive reactor, the retort and furnace shell made of Inconel heat-resistant steel will be It is no longer necessary, resulting in a significant cost reduction.

(2) The organic compounds required for the process of the present invention are widely produced for use as catalysts, and compared to the expensive halides used in the conventional process.
f: Can be easily converted into a single song.

In addition to the advantages of (1)...(6), the coating produced by the process of the present invention has a very good stability of the product, and since the process was developed, This is considered to be the most epoch-making invention. Furthermore, since the process of the present invention requires smoke compounds to ignite in the air, the introduction path from the cylinder to the furnace must be airtight, and strict care must be taken when handling them. .

Examples of the present invention are listed below.

1 Example 1 (1) By the process of the present invention: 1. JIS standard 1:'
-:((1 super hard alloy cutting tip cNNq(: 432
And JIS standard.

■-5 Ladder die for ultra-hard alloys for cold forging (Fig. 1)
and SKI') 61 punch (Fig. 2) was subjected to aluminum oxide i and FJ. Apparatus 6 uses the reaction used in the conventional process as it is, and [ζ□Article 111]
The coating was carried out with

(C, II,)2A ff C(-', 3% by volume -CO, 3% by volume 11, remaining volume] 1:% Reaction temperature 300-400°C Gas flow rate,
10 (□/Between control and reaction: 4
-, 5 hours In order to change the strength and thickness of the coating layer, the reaction temperature holding time was slightly changed, and 6
We have produced various test products. The test piece was cut, and the coating layer was also polished and corroded. When measured with a Fi (1 f, 1x microscope), the coating layer was approximately 3μ, and there were no oxidized layers, decarburized layers, or abnormal layers on the surface of the ultra-hard lid material. It was not recognized (see Fig. 4).

(1) The coated test piece was coated with the coated carbide tip using the conventional process.
1, a cutting test was conducted for comparison. The results are shown in Tables 1 and 2.

Table 1 Cutting Wear Test Data Table 2 Intermittent Cutting Defect Test Data (II) A comparative test was conducted between a Hellagu die coated with this process and a conventional carbide header die without coating. The results are shown in Table 3.

No.: (Table Hesogouguisu usage test data (Il+)
Punches and i coated with this Y process
; by the process of rice oil I) - layer] -1 to 'l'
i C1 layer L1 is A, (720, Comparison with the punch which has been applied -). The results are shown in Table 4. .

Table 4 Press KO pin use test We analyzed various test data and summarized below: (1)
Products previously thought to be uncoatable have been coated using the process of the present invention, and impressive test results have been obtained.

(2) The process of the present invention coats products that have conventionally only been coated with trisol or double coating, making them more than conventional products.
The second good result was obtained.

(3) The thickness of the covered m layer was classified into four types by changing the temperature and holding time, but the results showed that there was no 1α tangent relationship with the layer thickness, which indicates that the coating layer adhered to the base material. However, if it is completely diffused, it is assumed that the original performance of the Af゛,03 coating layer will be sufficiently exhibited regardless of the layer thickness.

(4) - From these series of test data, the decisive difference between the conventional process and the process of the present invention is the low temperature aXI.
This result is thought to be due to the diffusion and integration of the coating layer and the coating layer, with no adverse effect on the temperature at all.

(5) Breaking through the conventional concept of chemical vaporization, the low-temperature coating can actually be used as a product and fully effective. C, V, I), it is believed that a completely new field of use for chemical vapor deposition will be opened up.

The above data is useful not only for cutting as a super-hard alloy coated product, but also for cold forging molds and press molds due to its excellent wear resistance, impact resistance, and welding resistance with workpieces. It is also very effective as a wear-resistant carbide tool such as those made of special steel, and it has been proven that by applying the process of the present invention to the coating of special steel tools and machine parts, it is possible to mass-produce high-quality products at low cost. done.

C0 ~ ", I), chemical vapor deposition is a conventional process.
oo.

Since the reaction is basically based on the reaction at the high temperature after C1iij, it had various negative effects on coatings 1, 4 and 4, and was subject to technical, technical and cost constraints.However, the process of the present invention According to the authors, it is an epoch-making invention that solves 11 of these conventional problems at once, and is expected to dramatically expand the market for coated parts.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a cross-sectional view of a pilot helagoo die showing an application example of the present invention, Fig. 2 is a side view of a press KO pin showing an example of the use of a pond ja of the present invention, Fig. 3 , and Figure 4 are (x8oo) sharp images showing cross-sections of aluminum oxide layers coated in accordance with the present invention. Patent Applicant: 1 J.A.
Patent attorney Aoyama Bohha is the 2nd person.

Claims (2)

[Claims] (1) A coated tool characterized in that an aluminum oxide coating layer is formed directly on the surface of the tool at a coating reaction temperature of 40 + l "C or less". (2) Coating that forms 11 layers by chemical vapor deposition]-
In the method of manufacturing ingredients: 1. In the 1-arrangement "V vapor Vt, at least one of noethylaluminum chloride, triethylaluminum, and ethylaluminum cycloid is used, and a mixed gas of hydrogen gas and methane gas is used as the A gas. A method for manufacturing a coated tool.