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Nickel-chrome-molybdenum-tungsten alloy powder for plasma surfacing

A technology of plasma pile and nickel-chromium-molybdenum, which is applied in the field of alloy powder materials, can solve the problems of alloy powder not being able to meet requirements, sudden drop in high-temperature hardness, and poor high-temperature resistance, so as to save production costs, improve production efficiency, and improve corrosion resistance. Improved effect

Inactive Publication Date: 2012-12-19
兰州理工合金粉末有限责任公司
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Problems solved by technology

[0003] Ni-Cr-B-Si alloy is widely used in surface engineering technology because of its good wear resistance, corrosion resistance and oxidation resistance, but its high temperature resistance is worse than that of cobalt-based alloys, and its hardness suddenly drops at high temperatures above 700°C. down, even can not be used normally
It is hoped to use the plasma surfacing process to obtain a coating resistant to high temperature wear and corrosion on high temperature and high pressure sealing surfaces, fastening joints in oil fields, and wear-resistant parts in coal mines, so as to prolong the service life of workpieces. However, for some harsh Wear and corrosion environment, Ni-Cr-B-Si alloy powder cannot meet the requirements

Method used

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Embodiment Construction

[0007] The present invention is a nickel-chromium-molybdenum-tungsten alloy powder used for plasma surfacing. On the basis of Ni60A, an appropriate amount of Mo and W are added, and the content of Cr element is increased. The components are: C: 1.3~ 1.6%, B: 3.2~3.8%, Si: 3.8~4.5%, Cr: 22~28%, Fe: 3.0~5.0%, Mo: 3.0~5.0%, W: 1.0~3.0%, and the balance is Ni.

[0008] According to the above components, Use a medium frequency induction furnace to melt the purified and preheated raw materials, and use a fast-setting low-vacuum air atomization system to atomize and break the uniformly alloyed melt into powder particles. Select 75-150μm powder as the product, suitable for plasma Surfacing.

[0009] In the present invention, the content of C is between 1.3% and 1.6%, and Cr is also increased to 22-28%. Cr can be solid-soluted with Ni matrix to play a role of solid-solution strengthening, and forms Cr with C, B, etc. 23 C 6 , Cr 7 C 3 , CrB and other hard phases are evenly distri...

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Abstract

The invention discloses nickel-chrome-molybdenum-tungsten alloy powder for plasma surfacing. The nickel-chrome-molybdenum-tungsten alloy powder comprises the following components in percentage by weight: 1.3 to 1.6 percent of C, 3.2 to 3.8 percent of B, 3.8 to 4.5 percent of Si, 22 to 28 percent of Cr, 3.0 to 5.0 percent of Fe, 3.0 to 5.0 percent of Mo, 1.0 to 3.0 percent of W and the balance of Ni.

Description

technical field [0001] The invention relates to an alloy powder material for plasma surfacing welding, in particular to a nickel-chromium alloy powder material with high hardness and high wear resistance. Background technique [0002] In the plasma surfacing process, due to the concentrated heat of the plasma arc, the temperature is extremely high, and the arc center temperature can reach 15000-33000 ° C, so the alloy burns a lot during the cladding process, and because the substrate has a certain dilution of the cladding layer, It makes it difficult for the hardness of the plasma surfacing coating to reach the high hardness of the coating obtained by other processes, but because the plasma surfacing has the advantages of high bonding strength with the substrate, regular forming, small machining allowance, and high yield, it is still used in the industrial field. widely used. [0003] Ni-Cr-B-Si alloy is widely used in surface engineering technology because of its good wear...

Claims

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Application Information

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IPC IPC(8): C23C4/06C22C19/05B23K10/02
Inventor 胡春莲张富邦侯尚林
Owner 兰州理工合金粉末有限责任公司
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