Multi-component hard alloy and preparation method thereof

A cemented carbide and multi-component technology, applied in the field of WC-3C2---Co multi-component cemented carbide and its preparation, can solve the problems of increased difficulty in adjusting the properties of multi-component cemented carbide, complex impact mechanism, etc., and achieve the goal of overcoming high temperature metal Weakening, process stability, repeatable effect

Active Publication Date: 2019-09-13
SHAANXI SCI TECH UNIV
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Problems solved by technology

[0004] For example, Zhang Wenwen et al. studied the preparation of five kinds of WC-Fe-Ni cemented carbides with different Fe / Ni ratios by low-pressure sintering at 1450 ° C. By adjusting the ratio of Fe / Ni used to replace Co, combined with SEM, TEM, XRD, etc. The impact on the microstructure and properties of cemented carbide was tested by means. The results show that when the Fe / Ni ratio is 3:1, the comprehensive mechanical properties of the alloy are the best, and the grain size of the alloy is the smallest at this time, and the bending strength of the alloy is the smallest. The change trend is inversely proportional to the grain size change, which can be improved to a certain extent, but the corrosion resistance of the acid solution of the WC-Fe-Ni alloy is worse than that of the WC-Co cemented carbide ("Fe / Ni ratio Influence of WC-Fe-Ni Cemented Carbide Microstructure and Properties" Zhang Wenwen et al., Journal of Nonferrous Metals of China, Vol. 28, No. 9, 2018)
In the prior art, there are still many technologies that can replace WC-Co cemented carbide to a certain extent, especially some schemes that use multi-element metals for Co substitution. The impact mechanism is extremely complicated, and it is difficult to adjust the performance of multi-element cemented carbide also increased significantly

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preparation example Construction

[0026] The invention provides a kind of WC-(Ti x ,Cr 1-x ) 3 C 2 -(Fe, Cr)-(Ni, Cu)-Co multi-component cemented carbide preparation method, comprises the following steps:

[0027] WC powder, (Ti x ,Cr 1-x ) 3 C 2 Powder, Fe-Cr pre-alloyed powder, Ni-Cu pre-alloyed powder and Co powder are mixed according to the mass ratio of 63~75:4~7:10~15:3~8:5~10, and the mixed powder is sequentially WC-(Ti x ,Cr 1-x ) 3 C 2 -(Fe,Cr)-(Ni,Cu)-Co multi-component cemented carbide; where, 0.5≤x≤1;

[0028] The mass ratio of Fe and Cr in the Fe-Cr pre-alloyed powder is 89-97:3-11, and the mass ratio of Ni and Cu in the Ni-Cu pre-alloyed powder is 70-89:11-30.

[0029] The present invention will WC powder, (Ti x ,Cr 1-x ) 3 C 2 The powder, the Fe-Cr pre-alloyed powder, the Ni-Cu pre-alloyed powder and the Co powder are mixed in a mass ratio of 63-75:4-7:10-15:3-8:5-10. In the present invention, the WC powder, (Ti x ,Cr 1-x ) 3 C 2 The particle size of the powder, Fe-Cr pre-al...

Embodiment 1

[0056] A WC-(Ti x ,Cr 1-x ) 3 C 2 -(Fe,Cr)-(Ni,Cu)-Co multi-component cemented carbide and its preparation method: the steps are as follows:

[0057] (1) Weigh 73.65% Ni(CH 3 COO) 2 powder and 26.35% CuCl 2 2H 2 O powder, Ni(CH 3 COO) 2 Powder, CuCl 2 2H 2 O powder and deionized water are made into 200L of a solution with a concentration of 0.32mol / L. After fully stirring in a constant temperature water bath at 55°C, add an excess of sodium oxalate-NaOH mixed solution with a concentration of 0.15mol / L to the solution, and Add 3% positively charged cetyltrimethylammonium bromide surfactant, then continue to stir for 3h, filter and dry the solution to obtain the precursor powder, then place it in a hydrogen furnace at 520°C for 6h and heat reduction for 6h. After the furnace is cooled, ball mill the reduced powder for 7 hours under the protection of argon gas. The ball mill equipment is a planetary ball mill. -Cu pre-alloyed powder, and then perform high-frequency im...

Embodiment 2

[0063] A WC-(Ti x ,Cr 1-x ) 3 C 2 -(Fe,Cr)-(Ni,Cu)-Co multi-component cemented carbide and its preparation method: the steps are as follows:

[0064] (1) Weigh 73.65% Ni(CH 3 COO) 2 powder and 26.35% CuCl 2 2H 2 O powder, Ni(CH 3 COO) 2 Powder, CuCl 2 2H 2 O powder and deionized water are made into 200L of a solution with a concentration of 0.32mol / L. After fully stirring in a constant temperature water bath at 50°C, add an excess of sodium oxalate-NaOH mixed solution with a concentration of 0.1mol / L to the solution, and Add 3.5% positively charged hexadecyltrimethylammonium bromide surfactant, then continue to stir for 3h, filter the solution, dry to obtain the precursor powder, and then place it in a hydrogen furnace at 520°C for heating and reduction for 6h, After cooling with the furnace, ball mill the reduced powder for 7 hours under the protection of argon gas. The ball mill equipment is a planetary ball mill. Ni-Cu pre-alloyed powder is then subjected to hig...

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Abstract

The invention provides a WC-(Tix, Cr1-x)3C2-(Fe, Cr)-(Ni, Cu)-Co multi-component hard alloy and a preparation method thereof, and belongs to the field of high-temperature ceramic manufacturing. According to the multi-component hard alloy and the preparation method thereof, an Fe-Cr alloy and an Ni-Cu alloy are adopted to partially replace Co as a bonding phase of a WC-based hard alloy, the solid solution strength effect is obvious and the feasibility is high; and WC is partially replaced by (Tix, Cr1-x)3C2 solid solution carbide, the cost is reduced while the effect is improved, and Co and WCsources are saved. The preparation method comprises the steps of sequentially carrying out wet ball-milling, compression forming and vacuum hot pressing sintering after WC powder, (Tix, Cr1-x)3C2 powder, Fe-Cr prealloy powder, Ni-Cu prealloy powder and Co powder are mixed. The preparation method is stable in process, high in precision, and high in repeatability, and a novel multi-component hard alloy with excellent hardness, bending strength and self-corrosion current density performance.

Description

technical field [0001] The invention belongs to the technical field of high-temperature ceramic preparation, in particular to a WC-(Ti x ,Cr 1-x ) 3 C 2 -(Fe,Cr)-(Ni,Cu)-Co multi-component hard alloy and its preparation method. Background technique [0002] The traditional WC-Co cemented carbide is based on the refractory metal hard compound WC, and the metal Co is used as the binder phase, and it is prepared by powder metallurgy. Because Co has good wettability, yield and work hardening behavior, and WC has the characteristics of high melting point, hardness, chemical stability and thermal stability, so WC-Co cemented carbide is widely used; WC-Co hard alloy Alloys have high hardness, high strength, toughness and excellent wear resistance, and play an extremely important role in cutting, drilling, mining, machining and wear-resistant parts. [0003] However, Co is scarce and expensive, especially if the cemented carbide products with a utilization rate of less than 100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/10B22F1/00B22F3/02B22F3/14B22F9/04B22F9/22C22C1/05
CPCC22C29/08C22C29/067B22F3/02B22F3/14B22F9/04B22F9/22C22C1/051B22F2009/043B22F1/14
Inventor 刘芳
Owner SHAANXI SCI TECH UNIV
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