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Inhomogeneous hard alloy and preparation method thereof

A cemented carbide, non-uniform technology, applied in the field of cemented carbide and its preparation, can solve the problems that the toughness and strength of cemented carbide cannot be achieved, and the improvement of stacking porosity is not obvious enough, so as to achieve good toughness and strength, stacking The obvious effect of porosity

Active Publication Date: 2010-09-29
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the WC fine grains used in the above patent documents are all larger than 1 μm grains, and the nominal grain size of the coarse WC that can be produced at present is the grain size of multiple grains aggregated together. Such coarse WC grains There is not much difference between the actual grain size after ball milling and the fine grain size used, and the improvement of the bulk porosity after the combination of such thick and fine grains is not obvious enough, so that the manufactured cemented carbide cannot achieve both toughness and strength. requirements

Method used

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  • Inhomogeneous hard alloy and preparation method thereof
  • Inhomogeneous hard alloy and preparation method thereof

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Embodiment 1

[0028] a kind of like figure 1 The heterogeneous cemented carbide of the present invention shown, the heterogeneous cemented carbide is mainly composed of tungsten carbide, and contains Co phase and cubic carbide phase (also can contain orthogonal carbide phase), the heterogeneous hard alloy The grain distribution of tungsten carbide (WC) in the alloy has a bimodal structure, one of which is 0.7 μm and the other is 2.0 μm.

[0029] The heterogeneous cemented carbide of the present embodiment is prepared according to the following steps:

[0030] (1) Ingredients: select Co powder, TaNbC (6 / 4) and WC powder as raw materials, and the mass percentage of each raw material is

[0031] Co powder 9wt%

[0032] TaNbC 0.8wt% and

[0033] WC powder balance;

[0034] WC powder includes coarse and fine WC powder with two different particle sizes, the average particle size of coarse WC powder is 10.4 μm, and the average particle size of fine WC powder is 0.29 μm; the mass ratio of coars...

Embodiment 2

[0039] a kind of like figure 2 The heterogeneous cemented carbide of the present invention shown, the heterogeneous cemented carbide is mainly composed of tungsten carbide, and contains Co phase and cubic carbide phase (also can contain orthogonal carbide phase), the heterogeneous hard alloy The WC grain distribution in the alloy has a bimodal structure, one of which is 0.6 μm and the other is 2.1 μm.

[0040] The heterogeneous cemented carbide of the present embodiment is prepared according to the following steps:

[0041] (1) Ingredients: select Co powder, TaNbC (6 / 4) and WC powder as raw materials, and the mass percentage of each raw material is

[0042] Co powder 9wt%

[0043] TaNbC 0.8wt% and

[0044] WC powder balance;

[0045] WC powder includes coarse and fine WC powder with two different particle sizes, the average particle size of coarse WC powder is 10.4 μm, and the average particle size of fine WC powder is 0.29 μm; the mass ratio of coarse WC powder and fine ...

Embodiment 3

[0050] a kind of like image 3The heterogeneous cemented carbide of the present invention shown, the heterogeneous cemented carbide is mainly composed of tungsten carbide, and contains Co phase and cubic carbide phase (also can contain orthogonal carbide phase), the heterogeneous hard alloy The WC grain distribution in the alloy has a bimodal structure, one of which is 0.6 μm and the other is 2.2 μm.

[0051] The heterogeneous cemented carbide of the present embodiment is prepared according to the following steps:

[0052] (1) Ingredients: select Co powder, TaNbC (6 / 4) and WC powder as raw materials, and the mass percentage of each raw material is

[0053] Co powder 9wt%

[0054] TaNbC 0.8wt% and

[0055] WC powder balance;

[0056] WC powder includes coarse and fine WC powder with two different particle sizes, the average particle size of coarse WC powder is 10.4 μm, and the average particle size of fine WC powder is 0.29 μm; the mass ratio of coarse WC powder and fine WC...

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Abstract

The invention relates to tungsten carbide based hard alloy and a preparation method thereof and particularly discloses inhomogeneous hard alloy. The grain distribution of the tungsten carbide used as a main component in the inhomogeneous hard alloy has a double-peak structure, wherein one peak is between 0.3mu m and 0.9mu m, and the other peal is between 1.2mu m and 3.5mu n. The preparation method comprises the following steps of: selecting cobalt powder, carbides and tungsten carbide powder in a certain proportion as raw materials, wherein the tungsten carbide powder has two different granularities of being 2-12mu m and smaller than 1mu m, the mass ratio of the coarse tungsten carbide powder to the fine tungsten carbide powder is (0.5-2.0):1, and the carbides are one or more of cubic carbides and orthogonal carbides; then uniformly mixing the prepared raw materials; carrying out ball milling, drying, granulating and pressing; and finally, carrying out vacuum high-temperature sintering to obtain the inhomogeneous hard alloy. The inhomogeneous hard alloy has higher hardness, toughness and strength, simple preparation process and low cost.

Description

technical field [0001] The invention relates to a carbide-based hard alloy and a preparation method thereof, in particular to a tungsten carbide-based hard alloy and a preparation method thereof. Background technique [0002] The material for making metal cutting tools must have high high temperature hardness and wear resistance, have the necessary bending strength, impact toughness and chemical inertness, and good processability (cutting, forging and heat treatment, etc.), and not easily deformed. However, the higher the hardness of the material, the lower its toughness, that is to say, it is difficult to have both hardness and toughness of the material at the same time. The cemented carbide with non-uniform structure is one of the solutions to meet this demand. [0003] In the prior art, there is a double-grain cemented carbide for rock drilling tools prepared by the method of overlapping feeding, which is mainly based on the following mechanism of action: the accumulatio...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
Inventor 周定良黄文亮谢文王社权李屏黄前葆
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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