JPH08174272A - Copper-based alloy powder for hardfacing - Google Patents

Abstract

(57) [Summary] [Structure] Copper-based alloy powder for hardfacing, containing 5-40% by weight of Mn and 1-9% by weight of Si, and the balance Cu and unavoidable impurities, and 7.5% by weight or less of Al, 30% by weight of Zn % Or less, Sn15
Weight% or less, Pb10 weight% or less, Y, lanthanoid, Ti, Z
0.01 to 1% by weight in total of 1 or 2 or more selected from the group consisting of r, Hf, Ca and Mg, and 20% by weight or less in total of 1 or more of Mo, Nb, W and V, Fe20 1% or less selected from wt% or less, Co 20 wt% or less, Cr 20 wt% or less, B2 wt% or less, C2 wt% or less and solid solution oxygen 0.01 to 0.1 wt%
Copper-based alloy powder for hardfacing, which additionally contains at least one species. [Effect] The copper-based alloy powder for hardfacing according to the present invention has excellent heat resistance, wear resistance, strength characteristics, weldability, and low cost, and is widely used as a wear resistant overlay material. Can be used in

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper-based alloy powder for hardfacing, and more particularly to a wear-resistant copper-based alloy powder for hardfacing.

[0002]

2. Description of the Related Art Conventionally, Co alloys and Ni alloys have been mainly used as nonferrous alloys for hardfacing, and Cu-Zn alloys (brass alloys) and Cu-Si alloys have been used as Cu alloys. In particular, the Cu-8Al system is used for wear resistance. Recently, as the weight of automobiles has been reduced, aluminum members have come to be used in more severe environments, and there is a demand for hardfacing of aluminum members.

[0003]

However, it has been pointed out that the Cu-based alloy is suitable for welding on aluminum, but the wear resistance is insufficient. Recently, a Cu-high Ni alloy was developed. However, the lack of wear resistance and high cost have been pointed out. Further, there are some members that are required to have wear resistance at high temperatures, but no Cu-based materials meet this requirement.

It is an object of the present invention to have excellent heat resistance, wear resistance, strength characteristics, weldability, and low cost, and to be used as a wear-resistant build-up material for a wide range of fields. It is to provide a copper-based alloy powder.

[0005]

Means for Solving the Problems As a result of intensive studies for achieving the above object, the present inventors have found that a Cu--Mn--Si alloy base is a conventional Cu--Al alloy base or a Cu--Ni alloy base.
It was found that the copper-based alloy powder for hardfacing according to the present invention was completed by finding that it is more excellent in wear resistance and higher in high temperature strength than the alloy base.

That is, the copper-based alloy powder for hardfacing according to the present invention contains 5-40% by weight of Mn and 1-9% by weight of Si,
The balance consists of Cu and inevitable impurities. The copper-based alloy powder for hardfacing according to the present invention has a Mn of 5 to 40.
% By weight and 1 to 9% by weight of Si, and further comprises (a)
To (d) one or more, and the balance of Cu and unavoidable impurities: (a) Al 7.5 wt% or less, Zn 30 wt% or less,
One or more of strength improving elements selected from the group consisting of Sn 15 wt% or less and Pb 10 wt% or less,
(B) 0.01 to 1% by weight in total of one kind or two or more kinds of silicide forming elements selected from the group consisting of Y, lanthanoid, Ti, Zr, Hf, Ca and Mg, (c)
20% by weight or less, 20% by weight or less of Fe, 20% by weight or less of Co, and C in total of one or more of Mo, Nb, W and V
r one or more high temperature strength improving elements selected from the group consisting of 20% by weight or less, (d) B2% by weight or less,
One or more curing elements selected from the group consisting of C2% by weight or less and solid solution oxygen of 0.01 to 0.1% by weight.

Furthermore, the present invention uses any one of the above-mentioned hardfacing copper-based alloy powders to carry out overlay welding using a laser, a plasma arc, or an electron beam, and any one of the above. The present invention also relates to a hardfacing member obtained by compacting a copper-based alloy powder for hardfacing according to the shape of a welded portion of the hardfacing. In the copper-based alloy powder for hardfacing according to the present invention, Mn
Forms a solid solution with respect to Cu and forms a silicide due to the presence of Si. Therefore, Mn strengthens the matrix by forming a solid solution with Cu, and at the same time, functions to generate hard silicide and impart wear resistance. Incidentally, Mn is superior to Ni in the solid solution effect and the hardness of silicide in the copper-based alloy. Next, the amount of Mn added will be explained. Conventionally, Mn was added in an amount of less than 5% by weight in a copper-based alloy, but this was mainly aimed at solid solution strengthening in the Cu-Al system. It is a thing. In the present invention, the addition of 5 wt% or more is necessary for the formation of silicide. On the other hand, although the strength is improved as the amount of Mn added is increased, the melting point of the alloy is increased and the oxidation tendency of Mn becomes remarkable, and the castability and the weldability are both reduced. The amount of Mn added is preferably 40% by weight or less. Therefore, the addition amount of Mn is 5 to 40
Weight%

[0008] Si partially dissolves in Cu to harden the matrix, but most of them form silicide with Mn and Cu. Regarding the amount of Si added, it is necessary to add 1 wt% or more in order to obtain the effect of silicide formation.
However, if it exceeds 9% by weight, it becomes hypereutectic and coarse silicide is crystallized to embrittle the material. Therefore, the addition amount of Si is set to 1 to 9% by weight.

In order to further improve the strength of the copper-based alloy for hardfacing according to the present invention, it is effective to add an alloy element generally used for improving the strength of Cu alloy. That is, the addition of Al, Zn, and Sn imparts strength, good castability, and weldability, and Pb imparts lubricity. The addition amount range of these is a range that forms a solid solution with copper. That is, Al
Is 7.5 wt% or less, Zn is 30 wt% or less, and Sn is 1
5 wt% or less, and Pb is generally added at 10 wt%
Is valid until.

Further, Y, which has a strong tendency to form silicide, lanthanoids (La, Ce, misch metal, etc.), Ti,
Addition of Zr, Hf, Ca and Mg has the effect of improving the grain size, shape and distribution of the silicide. In order to obtain this effect, it is necessary to add one or more of these silicide-forming elements in a total amount of 0.01 or more. However, if it exceeds 1% by weight, needle-like silicide is generated and the material becomes brittle. Therefore, the amount of the silicide-forming element added is 0.01 to 1% by weight.

Further, in Cu alloys, Mo, Nb, W, V, Fe, Co, which are generally effective in imparting heat resistance,
The addition of Cr serves to improve the high temperature strength of the matrix and at the same time change the Mn silicide from acicular to granular. The effect is that at least one of Mo, Nb, W, and V has a total content of up to 20% by weight, Fe up to 20% by weight, and Co.
It improves up to 20% by weight and up to 20% by weight of Cr, but the effect is saturated even if Cr is added more than that, and no further increase in the effect can be obtained.

Furthermore, the hardness of the Cu alloy is improved by the addition of B, C, and O, which are effective for hardening the alloy as an interstitial solid solution element, and the welding characteristics such as the improvement of the joining with the base material are improved. Is achieved. The effect is B2 wt% or less,
It is achieved by adding C 2% by weight or less and solid solution oxygen of 0.01 to 0.1% by weight. The copper alloy having the above composition has wear resistance,
It is an alloy that excels in high-temperature strength and weldability, and is optimal as a wear-resistant surfacing alloy that has been conventionally demanded for aluminum.

Further, when overlay welding is performed using the copper-based alloy powder for hardfacing according to the present invention, it is desirable to use a laser, plasma arc, or electron beam having a high energy density as a heat source. This is because the use of such a high-density heat source increases the control range of the heat input amount, and as a result, the refining of the structure of the overlay portion is achieved by cooling with the base material. Laser with high energy density,
Overlay welding using plasma arc and electron beam is known, and the copper-based alloy powder for hardfacing according to the present invention can be subjected to overlay welding according to such known overlay welding method.

In addition, the copper-based alloy powder for hardfacing according to the present invention is compacted in advance according to the shape of the welded portion to form a hardfacing member, thereby facilitating the overlaying and stabilizing the quality. can do.

[0015]

【Example】

Examples 1 to 34 and Comparative Examples 1 to 8 Copper-based alloy powders for hardfacing having the compositions shown in Tables 1 and 2 below were prepared and tested according to the following test conditions: Test conditions Melt fluidity is 1500 Judgment was made based on whether or not atomization was possible at ° C: ○: good, △: atomized powder was not spherical but was gusset, ×: when atomized, the fluidity was poor and powder was not formed, or completely No melting; weldability was judged by the presence or absence of cracks under the following laser welding conditions: ◯: cracks, no spatter, Δ: no cracks, many spatters, ×: cracks were observed, base material: AC4 ( Aluminum casting), preheat 200 ° C Laser output: 1.8 kW Welding speed: 150 mm / min Atmosphere: Argon flow, flow rate 2 liter / min Blur amount: ab value 1.4 Hardness: Matrix hardness is micro-Vickers, 3
00g, 30 seconds, indenter: measured at room temperature and 300 ° C under the condition of sapphire Abrasion amount: Amsler type, 40 kg load, rotation speed 800
Measured at rpm, slip distance of 50,000 meters, slip ratio of 10%, room temperature, change in wear amount by volume. The above test results are shown in Tables 1 and 2.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

As described above in detail, the copper-based alloy powder for hardfacing according to the present invention has excellent heat resistance, wear resistance, strength characteristics, weldability, low cost, and high heat resistance. It can be put to practical use in a wide range of fields as an abradable overlay material.

Claims (8)

[Claims] 1. A copper-based alloy powder for hardfacing, comprising 5 to 40% by weight of Mn and 1 to 9% by weight of Si, with the balance being Cu and inevitable impurities. 2. Mn in an amount of 5-40% by weight and Si in an amount of 1-9% by weight, further less than 7.5% by weight of Al and 30% by weight of Zn.
Hereinafter, a copper-based alloy powder for hardfacing, which additionally contains one or more kinds of strength improving elements selected from the group consisting of Sn 15% by weight or less and Pb 10% by weight or less, and the balance being Cu and unavoidable impurities. . 3. Y, lanthanoid, Ti, Zr, Hf,
The copper-based alloy powder for hardfacing according to claim 1 or 2, further containing one or more kinds of silicide-forming elements selected from the group consisting of Ca and Mg in a total amount of 0.01 to 1% by weight. 4. A high-temperature strength improving property selected from the group consisting of 20% by weight or less in total of 20% by weight or less of Fe, 20% by weight or less of Co, and 20% by weight or less of Cr in total of at least one of Mo, Nb, W, and V. The copper-based alloy powder for hardfacing according to claim 1, 2 or 3, further containing one or more elements. 5. Mn 5-40% by weight, Si 1-9% by weight
And 1 to 20% by weight of Mo, and the balance being Cu and unavoidable impurities, the copper-based alloy powder for hardfacing according to claim 4. 6. An additional content of one or more curing elements selected from the group consisting of B2% by weight or less, C2% by weight or less, and solute oxygen of 0.01 to 0.1% by weight. 1,
The copper-based alloy powder for hardfacing according to 2, 3, 4 or 5. 7. A copper-based alloy powder for hardfacing according to claim 1, which is used for laser, plasma arc,
A member obtained by overlay welding using an electron beam. 8. A hardfacing member obtained by compacting the copper-based alloy powder for hardfacing according to any one of claims 1 to 6 according to the shape of the welded portion for overlaying.