Ultra-fine crystal gradient alloy with rich-cobalt surface and preparation method thereof

A cemented carbide, ultra-fine grain technology, applied in the field of cemented carbide manufacturing

Active Publication Date: 2014-04-23
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The WC grain size in the gradient cemented carbide prepared by the two-step sintering method is large, the performance is low, and the production cost is increased, which is not conducive to large-scale production

Method used

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  • Ultra-fine crystal gradient alloy with rich-cobalt surface and preparation method thereof
  • Ultra-fine crystal gradient alloy with rich-cobalt surface and preparation method thereof
  • Ultra-fine crystal gradient alloy with rich-cobalt surface and preparation method thereof

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Effect test

Embodiment 1

[0028] The ultra-fine-grain gradient cemented carbide with cobalt-rich surface of the present invention has the following components by mass percentage: 80%WC, 5%Ti(C,N), 14%Co, 0.3%VC, 0.7%Cr 3 C 2 , the metallographic structure is based on WC and cubic phase carbonitride as the core hard phase, cobalt as the binder phase to form a 15 μm thick cobalt-rich gradient layer on the surface, in which the hard phase and WC grains in the gradient layer The average size is 0.32 μm, the cobalt content in the cobalt-rich gradient layer on the surface is 1.4 times the nominal cobalt content of the cemented carbide, and the cobalt-rich gradient layer on the surface does not contain cubic carbonitride.

[0029] The preparation method of the superfine-grained gradient cemented carbide with cobalt-rich surface of the present invention is carried out according to the following steps:

[0030] (1) The cemented carbide raw material with added carbonitride is used for batching, and its composit...

Embodiment 2

[0034] The ultra-fine-grain gradient cemented carbide with cobalt-rich surface of the present invention has the following components by mass percentage: 77.2%WC, 6%Ti(C,N), 15%Co, 0.5%VC, 0.8%Cr 3 C 2 , 0.5% carbon black, the metallographic structure is based on WC and cubic phase carbonitride as the core hard phase, and cobalt is used as the binder phase to form a 20 μm thick cobalt-rich gradient layer on the surface, in which the hard phase and gradient layer The average size of the WC grains in the medium is 0.33 μm, and the cobalt content in the cobalt-rich gradient layer on the surface is 1.3 times the nominal cobalt content of the cemented carbide, and the cobalt-rich gradient layer on the surface does not contain cubic carbonitrides.

[0035] The preparation method of the superfine-grained gradient cemented carbide with cobalt-rich surface of the present invention is carried out according to the following steps:

[0036] (1) Cemented carbide raw materials with added ca...

Embodiment 3

[0040] The cobalt-rich ultrafine-grain gradient cemented carbide of the present invention has a composition by mass percentage of: 91.5%WC, 2%Ti(C,N), 6%Co, 0.2%Cr 3 C 2 , 0.3% carbon black, the metallographic structure is based on WC and cubic phase carbonitride as the core hard phase, and cobalt is used as the binder phase to form a 40 μm thick cobalt-rich gradient layer on the surface, in which the hard phase and the gradient layer The average size of the WC grains in the medium is 0.28 μm, and the cobalt content in the cobalt-rich gradient layer on the surface is 1.5 times the nominal cobalt content of the cemented carbide, and the cobalt-rich gradient layer on the surface does not contain cubic carbonitrides.

[0041] The preparation method of the superfine-grained gradient cemented carbide with cobalt-rich surface of the present invention is carried out according to the following steps:

[0042] (1) The cemented carbide raw material with added carbonitride is used for b...

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Abstract

The invention belongs to the field of hard alloy preparation, and in particular relates to an ultra-fine crystal gradient alloy with a rich-cobalt surface and a preparation method of the alloy. According to the ultra-fine crystal gradient alloy with the rich-cobalt surface, a gradient layer with the rich-cobalt surface, which is 10-40mu m thick, is formed by taking WC (Wolfram Carbide) and cubic phase carbonitride as a core part hard phase and cobalt as the binding phase, wherein the average size of the crystal particles of WC in the hard phase and the gradient layer is 0.2-0.4mu m, the content of cobalt in the gradient layer with the rich-cobalt surface is 1.2-2 times of the standard content of cobalt of hard alloys, and the gradient layer with the rich-cobalt surface is free of the cubic phase carbonitride. The preparation method comprises the following steps: firstly, preparing the materials, wet-grinding and pressing into a material blank, and supplying an inert gas with the pressure of 5-10MPa before reaching a liquid phase sintering temperature, wherein the liquid phase sintering temperature is 1,350-1,500 DEG C. By charging the gas with certain pressure in the liquid phase sintering period, the ultra-fine crystal gradient alloy with the rich-cobalt surface is prepared, the WC crystal grains are refined, a rich-cobalt surface layer of certain thickness is obtained, the sintering period is shortened, and the production cost is lowered.

Description

technical field [0001] The invention belongs to the field of cemented carbide manufacture, and in particular relates to a cobalt-rich superfine-grain gradient cemented carbide and a preparation method thereof. Background technique [0002] Due to its high strength, hardness and good wear resistance, cemented carbide is mainly used to make cutting tools and is widely used in the field of cutting processing. In recent years, with the development of material science, more and more difficult-to-machine materials have begun to be used in many applications, so the performance of cemented carbide tools used in processing materials has been put forward higher and higher requirements, and with the modern manufacturing industry The development of the development requires that the cemented carbide tool is suitable for high-speed continuous cutting, etc., which requires the cemented carbide tool not only to have good wear resistance, but also to have good toughness and impact resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/10
Inventor 王凯周向葵王强许智峰刘铁赫冀成
Owner NORTHEASTERN UNIV LIAONING
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