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Ultrafine crystal gradient hard alloy with double-gradient-layer structure on surface as well as preparation method thereof

A cemented carbide, ultra-fine grain technology, applied in the field of cemented carbide manufacturing, can solve the problems of poor stiffness and resistance to plastic deformation, difficult to control, low hardness, etc., to increase the stiffness of the matrix and the ability to resist plastic deformation, improve properties, the effect of improving the strength and surface toughness of the alloy

Active Publication Date: 2019-01-08
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the invention is to solve the problem that the grain size of the present double-layer gradient structure cemented carbide has large grain size, low strength and hardness, and low hardness, rigidity and hardness in the hard layer under the higher toughness-rich binder phase gradient layer. The ability to resist plastic deformation is poor, and the two-stage sintering process adopted is complicated and difficult to control.

Method used

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  • Ultrafine crystal gradient hard alloy with double-gradient-layer structure on surface as well as preparation method thereof
  • Ultrafine crystal gradient hard alloy with double-gradient-layer structure on surface as well as preparation method thereof
  • Ultrafine crystal gradient hard alloy with double-gradient-layer structure on surface as well as preparation method thereof

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Embodiment 1

[0038] The surface of the present invention has an ultrafine-grained gradient hard alloy with a double gradient layer structure, and its composition is: 70%WC, 5%Ti(C,N), 6%(W,Ti)C, 6%( Ta,Nb)C, 12%Co, 0.4%VC, 0.6%Cr 3 C 2 , the metallographic structure is based on WC and cubic phase carbonitride as the core hard phase, cobalt as the binding phase to form a 30 μm thick binder phase layer on the outside, and a 21 μm thick cubic phase layer on the inside. The average size of WC grains in the hard phase and double gradient layer structure is 0.3 μm, the outer binder-rich gradient layer does not contain cubic carbonitrides, and the cobalt content is 1-2 times the nominal cobalt content of cemented carbide , the content of cubic phase elements in the inner cubic phase-rich layer is 1-1.5 times the nominal content of cemented carbide.

[0039] The preparation method of the ultra-fine-grained gradient cemented carbide having a double gradient layer structure on the surface of the p...

Embodiment 2

[0045] The surface of the present invention has an ultrafine-grained gradient cemented carbide with a double gradient layer structure, and its composition is: 83%WC, 3%Ti(C,N), 2%(W,Ti)C, 1%( Ta,Nb)C, 10%Co, 0.2%VC, 0.8%Cr 3 C 2 , the metallographic structure is based on WC and cubic phase carbonitride as the core hard phase, cobalt as the binding phase to form a 48 μm thick binder phase layer on the outside, and a 18 μm thick cubic phase layer on the inside. The average size of WC grains in the hard phase and double gradient layer structure is 0.31 μm, the outer binder-rich gradient layer does not contain cubic carbonitrides, and the cobalt content is 1-2 times the nominal cobalt content of cemented carbide , the content of cubic phase elements in the inner cubic phase-rich layer is 1-1.5 times the nominal content of cemented carbide.

[0046] The preparation method of the ultra-fine-grained gradient cemented carbide having a double gradient layer structure on the surface o...

Embodiment 3

[0052] The surface of the present invention has an ultrafine-grain gradient hard alloy with a double gradient layer structure, and its composition is: 78%WC, 4%Ti(C,N), 4%(W,Ti)C, 4%( Ta,Nb)C, 9%Co, 0.5%VC, 0.5%Cr 3 C 2 , the metallographic structure is based on WC and cubic phase carbonitride as the core hard phase, cobalt as the binding phase to form a 42 μm thick binder phase layer on the outside, and a 27 μm thick cubic phase layer on the inside. The average size of WC grains in the hard phase and double gradient layer structure is 0.32 μm, the outer binder-rich gradient layer does not contain cubic carbonitrides, and the cobalt content is 1-2 times the nominal cobalt content of cemented carbide , the content of cubic phase elements in the inner cubic phase-rich layer is 1-1.5 times the nominal content of cemented carbide.

[0053] The preparation method of the ultra-fine-grained gradient cemented carbide having a double gradient layer structure on the surface of the pre...

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Abstract

The invention belongs to the field of hard alloy manufacturing and particularly relates to ultrafine crystal gradient hard alloy with a double-gradient-layer structure on the surface as well as a preparation method thereof. The hard alloy takes WC and carbon nitride as a core hard phase; the double-gradient-layer structure comprises a cobalt-enriched layer with the thickness of 20 to 50 um which is formed on the surface by taking the cobalt as the adhesion phase as well as a cubic-phase-enriched layer with the thickness of 10 to 30 um which is formed on the inner side by taking the carbon nitride as a cubic phase; the average size of the WC crystal grains is 0.1 to 0.5 um; the surface cobalt-enriched gradient layer does not contain the cubic phase and the cobalt content is 1 to 2 times ofthe nominal content; and the cubic phase element content of the inner side cubic-phase-enriched layer is 1 to 1.5 times of the nominal content. The preparation method comprises the following steps: after batching, performing wet grinding and performing pressing formation; and sintering by combining low-pressure sintering with gradient sintering to obtain the ultrafine crystal gradient hard alloy with the double-gradient-layer structure. The ultrafine crystal gradient hard alloy with the double-gradient-layer structure is reasonable in structural design, simple and controllable in preparation process and low in production cost and can realize large-scale industrialized production and application.

Description

technical field [0001] The invention belongs to the field of hard alloy manufacture, and in particular relates to an ultra-fine-grain gradient hard alloy with a double gradient layer structure on the surface and a preparation method thereof. Background technique [0002] Cemented carbide is a kind of refractory metal compound (WC, TiC, TaC, NbC, etc.) Alloy materials have the advantages of high strength and hardness, and good wear resistance. They are mainly used to make knives and are widely used in the field of cutting processing. In recent years, with the development of material science and machining industry, higher and higher requirements have been put forward for the wear resistance, strength, hardness and plastic deformation resistance of cemented carbide tool materials under high-speed continuous cutting conditions. [0003] Due to its small grain size, high strength and hardness, ultrafine-grained cemented carbide has excellent performance in the field of machining...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C29/02
CPCC22C1/051C22C29/005C22C29/02
Inventor 周向葵吴深樊江磊王艳王凯王强
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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