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A kind of composite wc alloy powder and its preparation method and application

An alloy powder and alloy technology, which is applied in metal powder material technology and advanced manufacturing application fields, can solve problems such as deficiencies, and achieve the effect of diversified molding and excellent anti-corrosion.

Active Publication Date: 2018-08-17
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, tungsten carbide alloy powder has the disadvantages of brittleness on the forming surface and insufficient corrosion resistance of the bonding phase such as HCl and HF.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: According to the requirements of the NiMoCrFeCo binder phase alloy composition, nickel, molybdenum, cobalt, nickel-chromium alloy, and nickel-chromium-iron alloy are added to a vacuum melting furnace for melting. The melting temperature is 1380 ° C, and 23.2% Cr, 3.5% Fe, 12.5% ​​Mo, 2.05% Co, 0.02% C, 0.06% Mn, 0.06% Si, 0.05% Al, 3.5% W, 0.25% V, ≤ 0.006% P, ≤ 0.006% S and NiMoCrFeCo bonding composition Phase alloy melt; WC and NiMoCrFeCo are sprayed, mixed and coated at a mass ratio of 8:2 to obtain NiMoCrFeCo-WC shell-core powder. Vacuum sintering at 900-920°C for 15-40min, cooling and sieving to reach NiMoCrFeCo-WC alloy powder.

Embodiment 2

[0041]Example 2: According to the composition requirements of the NiMoCrFeCo binder phase alloy, nickel, molybdenum, cobalt, nickel-chromium alloy, nickel-chromium-iron alloy and other materials are added to the vacuum melting furnace for melting. The melting temperature is 1420 ° C, and 21.6% Cr, 5.5% Fe, 15.4% Mo, 2.5% Co, 0.01% C, 0.01% Mn, ≤0.06% Si, ≤0.05% Al, 2.95% W, ≤0.20% V, ≤0.006% P, ≤0.006% S and the balance Ni The formed NiMoCrFeCo bond phase alloy melt; WC and NiMoCrFeCo are mixed and stirred at a mass ratio of 35:65, argon jet atomization, cooling and sieving to reach NiMoCrFeCo-WC alloy powder.

Embodiment 3

[0042] Example 3: According to the requirements of the NiMoCrFeCo binder phase alloy composition, nickel, molybdenum, cobalt, nickel-chromium alloy, and nickel-chromium-iron alloy are added to a vacuum melting furnace for melting, and the melting temperature is 1450 ° C to refine 15.0% Cr, 11.5% Fe, 22.0 %Mo, 0.05% Co, 0.02% Mn, ≤0.09% Si, ≤0.03% Al, 2.0% W, ≤1.0% V, ≤0.015% S and the rest NiMoCrFeCo bonded phase alloy melt, after argon Gas-jet atomization into NiMoCrFeCo alloy powder; WC and NiMoCrFeCo powder are mixed by vacuum ball milling at a ratio of 7:3, and then subjected to atmospheric hot isostatic pressing to form NiMoCrFeCo-WC alloy rods. The sintering temperature is 1250±20°C and the pressure is 160Mpa. The protective atmosphere is argon, the NiMoCrFeCo-WC alloy bar is melted in a vacuum induction melting furnace, and the molten NiMoCrFeCo-WC alloy droplets are sprayed and atomized with high-purity argon, the induction melting current is 650A, and the argon speed i...

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Abstract

The invention discloses a composite WC alloy powder and its preparation method and application. The alloy powder is NiMoCrFeCo-WC alloy powder with a WC core and a NiMoCrFeCo shell; according to the mass percentage, the composition of the NiMoCrFeCo-WC alloy powder is: 1.84-5.02 %C, 2.00-7.00% Mo, 3.80-13.30% Cr, 0.24-3.45% Fe, 0.01-2.07% Co, 29.56-76.90% W, ≤0.02% Mn, ≤0.3% V , ≤0.027% of Si, ≤0.015% of Al, ≤0.006% of P, ≤0.006% of S and the balance of Ni. The WC alloy powder of the present invention provides composite powder with excellent anti-corrosion, wear-resistant and anti-oxidation functions for thermal spraying, powder metallurgy, hot-pressing sintering and the like.

Description

technical field [0001] The invention belongs to the field of metal powder material technology and advanced manufacturing application, and specifically relates to NiMoCrFeCo-WC alloy powder material technology, which is mainly used for thermal spraying, surface cladding, powder metallurgy and sintering molding. Background technique [0002] Tungsten carbide alloy powder has become one of the most important ways to strengthen high-performance mechanical parts. The tungsten carbide alloy is bonded to the steel surface by thermal spraying, sintering, spray welding and other processes to form a surface with high hardness, oxidation resistance, high temperature resistance and corrosion resistance, so that the steel parts attached to the outer layer of tungsten carbide have excellent surface properties , to obtain a high service life. [0003] Tungsten carbide alloy powder is composed of hard phase WC particles and bonding phase, and the bonding phase of coated WC alloy powder is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/08B22F9/04C22C19/05C23C4/06B33Y70/00
CPCC22C19/056C23C4/06B22F9/04B22F9/082B33Y70/00B22F2009/043B22F2009/0836B22F2009/0848B22F1/17
Inventor 沈承金周树政胡定祥陶庆陈正王延庆张平王晓虹高鹏闫士良姚叶沈浩任宣儒
Owner CHINA UNIV OF MINING & TECH