Non-homogeneous gradient hard alloy and preparation method thereof

A cemented carbide, non-uniform technology, applied in the field of powder metallurgy, can solve problems such as insufficient wear resistance, increased solubility of fine WC, difficulty in controlling the particle size and proportion of fine WC, etc., to achieve good toughness and strength, superior performance, and excellent cutting edge The effect of mouth strength and impact resistance

Active Publication Date: 2016-07-27
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, non-uniform gradient cemented carbide cannot be realized by simply combining the two existing technologies of non-uniform alloy and gradient cemented carbide. On the one hand, the existing non-uniform gradient cemented carbide is mainly used for mining tools, milling tools, etc. In the field of metal turning, which requires high wear resistance and high temperature plastic deformation resistance, this structure obviously has the disadvantage of insufficient wear resistance. It is also difficult to realize the bimodal particle size distribution of WC grains in the process, because the fine WC powder is preferentially dissolved and precipitated during the sintering process, especially after the high cubic phase compound is added, WC will dissolve into it, so the fine WC Solubility will increase further, making it difficult to control fine WC particle size and ratio

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  • Non-homogeneous gradient hard alloy and preparation method thereof
  • Non-homogeneous gradient hard alloy and preparation method thereof
  • Non-homogeneous gradient hard alloy and preparation method thereof

Examples

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Embodiment 1

[0045] A kind of non-uniform gradient cemented carbide of the present invention, in this embodiment non-uniform gradient cemented carbide is with 8wt.% Co as binder phase, with 92wt.% tungsten carbide and titanium-containing cubic phase compound as hard phase, wherein the content of the titanium-containing cubic phase compound is 3.4wt.%, and the specific composition of the titanium-containing cubic phase compound is 2.0wt.% (Ti, W) C, wherein the W content is 45.2wt.%, and 0.4wt.% of TiC 0.5 N 0.5 , 1.0 wt.% (Ta, Nb)C, Ta / Nb mass ratio=3. Tungsten carbide (WC) grain distribution has a bimodal structure, one of which is 0.8 μm and the other is 2.8 μm. The original WC powder includes two different particle sizes, coarse and fine. The average particle size of coarse WC powder is 10.0 μm. The average particle size of fine WC powder is 0.5 μm, and the mass ratio of fine WC powder to coarse WC powder is 0.3:1. In this example, the non-uniform gradient cemented carbide has a surfa...

Embodiment 2

[0057] A kind of non-uniform gradient cemented carbide of the present invention, in this embodiment non-uniform gradient cemented carbide is with 8wt.% Co binding phase, with 92wt.% tungsten carbide and titanium-containing cubic phase compound as hard phase, wherein The content of titanium-containing cubic phase compound is 3.4wt.%. 0.5 N 0.5 , 1.0 wt.% (Ta, Nb)C, Ta / Nb mass ratio=3. The grain distribution of tungsten carbide (WC) has a bimodal structure, one of which is 1.0 μm and the other is 2.5 μm. The original WC powder includes two different particle sizes, coarse and fine. The average particle size of coarse WC powder is 8.0 μm. The average particle size of fine WC powder is 1.2 μm; the mass ratio of fine WC powder to coarse WC powder is 0.7:1. In this example, the non-uniform gradient cemented carbide has a surface gradient structure with titanium-containing cubic phase compounds missing, the average binder phase content of the surface gradient structure is 1.5 times...

Embodiment 3

[0069] A kind of non-uniform gradient cemented carbide of the present invention, in this embodiment non-uniform gradient cemented carbide is to use 6wt.% Co binding phase, with 94wt.% tungsten carbide and titanium-containing cubic phase compound as hard phase, wherein The content of titanium-containing cubic phase compound is 3.4wt.%, and its specific composition is 2.0wt.% (Ti, W) C, of ​​which W content is 51.3%, 0.4wt.% TiC 0.5 N 0.5, 1.0 wt.% (Ta, Nb)C, Ta / Nb mass ratio=3. Tungsten carbide (WC) grain distribution has a bimodal structure, one of which is 0.6 μm and the other is 1.9 μm. The original WC powder includes two different particle sizes, coarse and fine. The average particle size of coarse WC powder is 8.0 μm. The average particle size of fine WC powder is 0.8 μm; the mass ratio of fine WC powder and coarse WC powder is 0.8:1. In this example, the non-uniform gradient cemented carbide has a surface gradient structure with titanium-containing cubic phase compound ...

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Abstract

The invention discloses non-homogeneous gradient hard alloy and a preparation method thereof. According to the non-homogeneous gradient hard alloy, Co serves as a binding phase, a tungsten carbide and titanium-containing cubic phase compound serves as a hard phase, the titanium-containing cubic phase compound accounts for 2-8 wt.% of the mass fraction of the non-homogeneous gradient hard alloy, tungsten carbide grain distribution has a double-peak structure, the original particle size is rough and fine, and the non-homogeneous gradient hard alloy is of a surface structure without a titanium-containing cubic phase compound with the average binding phase content 1-2 times of a nominal binding phase content. The preparation method includes the steps of material preparation, mixing, milling, compression molding and sintering. The non-homogeneous gradient hard alloy has higher hardness, toughness and bending strength and can meet the machining requirement of cast iron, alloy steel, stainless steel and other metal materials, the preparation method is simple in process, and cost is low.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a non-uniform gradient cemented carbide and a preparation method thereof, in particular to a cemented carbide with a non-uniform WC particle size distribution and a cubic phase gradient structure on the surface and a preparation method thereof. Background technique [0002] Surface lack of cubic phase (also known as de-β layer) gradient structure cemented carbide refers to adding a certain amount of cubic phase to the raw material powder, such as TiC, TiN or solid solution carbide (Ti, W) C, (Ta, Nb) C Or solid solution carbonitride (Ti, W) (C, N), (Ti, Ta, Nb) (C, N), TiCN, etc., the raw material powder is ball milled and mixed, and pressed into a green compact containing a cubic phase as a whole, after sintering In the stage, by changing the atmosphere in the furnace, a gradient layer of lacking cubic phase is formed on the surface of the substrate with a certain thickness. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F3/10
CPCC22C1/051C22C29/005C22C29/08B22F3/101B22F2998/10B22F1/052B22F3/02B22F2009/043
Inventor 谢文左锐温光华陈响明王社权
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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