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Submicro gradient hard alloy with cubic phase removed on surface layer and preparation method

A cemented carbide and cubic phase technology, which is applied in the field of cemented carbide materials, can solve the problems of decreasing the wettability of the cemented carbide phase and the binder, increasing the pores of the gradient cemented carbide, hindering sintering and densification, etc., so as to reduce the porosity rate, reducing decarburization problems, promoting strength and hardness

Active Publication Date: 2022-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Whether it is the adsorbed oxygen or the combined oxygen of the raw material powder, the oxidation during the preparation process will cause the wettability of the hard phase and the binder to decrease during sintering, thereby hindering the densification of sintering, resulting in an increase in the pores of the gradient cemented carbide, and a decrease in strength and hardness. series of questions

Method used

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  • Submicro gradient hard alloy with cubic phase removed on surface layer and preparation method
  • Submicro gradient hard alloy with cubic phase removed on surface layer and preparation method
  • Submicro gradient hard alloy with cubic phase removed on surface layer and preparation method

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preparation example Construction

[0065] According to the present invention, a second aspect is to provide a method for preparing a submicron gradient cemented carbide with a surface layer decubic phase described in the first aspect, the method comprising:

[0066] Step 1, mixing ball mill.

[0067] In step 1, the raw material of the mixture includes Ti(C x , N 1-x ) powder, (W y , Ti 1-y ) C powder, TaC powder and WC powder.

[0068] According to the present invention, the Ti(C x , N 1-x ) powder, (W y , Ti 1-y ) The weight percent content and particle size of C powder, TaC powder and WC powder are preferably the same as the weight percent content and particle size of each substance described in the first aspect.

[0069] According to the present invention, the ball milling process has a direct effect on the cemented carbide.

[0070] In step 1, the weight ratio of pellets is 2-20:1, preferably 5-15:1, more preferably 10:1.

[0071] According to the present invention, the ball loading amount is dete...

Embodiment 1

[0128] Preparation of Submicrograded Cemented Carbide with Surface Decubic Phase

[0129]Weigh the raw materials by weight to prepare the sub-micro gradient cemented carbide with decubic phase on the surface layer, in which Co with an average particle size of 1.10μm accounts for 9.2%, and Ti(C) with an average particle size of 1.38μm 0.5 ,N 0.5 ) accounted for 3.9% with a particle size of 2.80μm (W 0.23 ,Ti 0.77 )C accounted for 5.3%, TaC with a particle size of 1.28 μm accounted for 1%, W with a particle size of 2.00 μm accounted for 3.34%, and the rest was WC with a particle size of 0.65 μm. The atomic ratio of (Ti+Ta) to N in the total composition of the raw material was 3.54:1.

[0130] First, WC powder, Ti (C 0.5 ,N 0.5 ) powder, (W 0.23 ,Ti 0.77 ) C powder and TaC powder were added to a stirring ball mill for mixing. The grinding balls were WC-6wt% Co cemented carbide balls of Φ6mm, and the weight ratio of the balls was 10:1, and the grinding was carried out at a ...

Embodiment 2

[0138] The method for preparing the submicron gradient cemented carbide with decubic phase on the surface layer in this example is the same as that in Example 1, except that TaC is not added, and the atomic ratio of Ti to N in the total composition of the raw material is 3.38:1.

[0139] The obtained graded cemented carbide has a decubic surface layer thickness of about 37.2 μm and an average WC grain size of 0.63 μm. The SEM image of the microstructure is as follows figure 2 As shown in (a), the porosity is A02B00, and the metallographic structure is as follows figure 2 (b).

[0140] The prepared sub-micro gradient cemented carbide has a density of 99.4%, a transverse fracture strength of 2028.44MPa, and a hardness (Hv30) of 1798.1MPa.

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Abstract

The invention discloses a submicro gradient hard alloy with a cubic phase removed from a surface layer and a preparation method, the submicro gradient hard alloy comprises Co powder, Ti (Cx, N1-x) powder, (Wy, Ti1-y) C powder, TaC powder, W powder and WC powder, and adsorption oxygen and chemical oxygen of submicro WC powder, cubic phase carbide and other ceramic raw material powder are reduced through atmosphere protection heat treatment; the oxygen content of the mixed raw material powder is reduced, so that the decarburization problem of the gradient hard alloy is remarkably reduced, meanwhile, the content ratio of cubic phase metal elements to N can be controlled, and the submicro gradient hard alloy is obtained through vacuum pre-sintering and pressure final sintering treatment. And the deoxidation effect is remarkable, the porosity in the gradient hard alloy is reduced, the strength and hardness of the gradient hard alloy are promoted, and the obtained submicro gradient hard alloy has excellent wear resistance and toughness and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of cemented carbide materials, in particular to a cemented carbide material and a preparation method thereof, and more particularly, to a submicro gradient cemented carbide with decubic phase in the surface layer and a preparation method thereof. Background technique [0002] During the sintering process of homogeneous composition cemented carbide, through the decomposition of nitrides or carbonitrides and element diffusion, the surface layer can remove the brittle sodium chloride type face-centered cubic solid solution phase and rich in the ductile metal binder phase, so that the original The formation of surface layer decubic phase gradient cemented carbide. The graded cemented carbide has high toughness on the surface, but still maintains high hardness inside. When this graded cemented carbide is used as a chemical vapor deposition (CVD) coated cemented carbide tool base, the high toughness of its surface layer ca...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F3/10B22F3/14C22F1/00
CPCC22C29/08C22C1/051C22C1/10B22F3/10B22F3/14C22F1/00
Inventor 杨天恩桑江燕夏旭任菊苏文卓
Owner SICHUAN UNIV
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