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Cemented carbide having nearly spherical WC grains and preparing method thereof

A cemented carbide and near-spherical technology, which is applied in the field of cemented carbide with nearly spherical WC grains and its preparation, can solve the problems of troublesome preparation methods, reduced alloy properties, and cubic phase enrichment, etc. The effect of chipping, reducing stress concentration, and low ball milling time

Active Publication Date: 2014-02-26
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, the preparation method of this invention is cumbersome, and the process is relatively complicated. After the alloy is vacuum sintered at 1400-1440 ° C, nitrogen gas is directly introduced into the furnace for vacuum quenching, which may nitriding the alloy or cause the cubic phase to be rich on the surface of the alloy. set, reducing the properties of the alloy

Method used

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  • Cemented carbide having nearly spherical WC grains and preparing method thereof
  • Cemented carbide having nearly spherical WC grains and preparing method thereof
  • Cemented carbide having nearly spherical WC grains and preparing method thereof

Examples

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Embodiment 1

[0030] An example of the present invention figure 1 The cemented carbide with nearly spherical WC grains shown is composed of Co, cubic TaC and WC, wherein the content of Co is 12.5wt% (if not otherwise specified, all refer to the mass fraction, the same below ), the content of cubic TaC is 2.45wt%, the balance is WC, the C / W ratio of the cemented carbide is 0.824; the WC grains in the cemented carbide are nearly spherical, and the sphericity of the WC grains is 0.79 .

[0031] In this embodiment, the FSSS grain size of the WC raw material is 2.40 μm, and the cemented carbide is a uniform cemented carbide.

[0032] A method for preparing the cemented carbide with nearly spherical WC grains in the above embodiment includes the following steps:

[0033] (1) Mixing: Mix Co powder, TaC powder and WC powder, where the content of Co powder is 12.5wt%, the content of TaC powder is 2.45wt%, and the balance is WC powder; put the mixed powder on the drum Ball mill in a ball mill for 6 hours ...

Embodiment 2

[0037] An example of the present invention figure 2 The cemented carbide with nearly spherical WC grains shown is composed of Co, cubic TaC and WC, wherein the content of Co is 8wt%, the content of cubic TaC is 1.85wt%, and the balance is WC, the C / W ratio of the cemented carbide is 0.813; the WC grains in the cemented carbide are nearly spherical, and the sphericity of the WC grains is 0.80.

[0038] In this embodiment, the FSSS grain size of the WC raw material is 2.56 μm, and the cemented carbide is a uniform cemented carbide.

[0039] A method for preparing the cemented carbide with nearly spherical WC grains in the above embodiment includes the following steps:

[0040] (1) Mixing: Mix Co powder, TaC powder and WC powder, where the content of Co powder is 8wt%, the content of TaC powder is 1.85wt%, the balance is WC powder; the mixed powder is placed in a roller ball mill Middle ball milling for 5 hours to obtain mixed slurry;

[0041] (2) Pressing: drying, granulating and pres...

Embodiment 3

[0044] An example of the present invention image 3 The cemented carbide with nearly spherical WC grains shown is composed of Co, cubic TaC and WC, wherein the content of Co is 8wt%, the content of cubic TaC is 1.85wt%, and the balance is WC, the C / W ratio of the cemented carbide is 0.813; the WC grains in the cemented carbide are nearly spherical, and the sphericity of the WC grains is 0.87.

[0045] In this embodiment, the FSSS grain size of the WC raw material is 3.92 μm, and the cemented carbide is a uniform cemented carbide.

[0046] A method for preparing the cemented carbide with nearly spherical WC grains in the above embodiment includes the following steps:

[0047] (1) Mixing: Mix Co powder, TaC powder and WC powder, where the content of Co powder is 8wt%, the content of TaC powder is 1.85wt%, the balance is WC powder; the mixed powder is placed in a roller ball mill Middle ball milling for 4 hours to obtain mixed slurry;

[0048] (2) Pressing: drying, granulating and press...

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Abstract

The invention discloses cemented carbide having nearly spherical WC grains and a preparing method thereof. The cemented carbide comprises the components in mass fraction: 3%-15% of Co, 0.1%-12% of a cubic phase, and the balance being WC; the C / W ratio of the cemented carbide is 0.78-0.89. The WC grains are nearly spherical in shape, and the spherical degree is 0.7-1. The preparation method comprises the steps of mixing a Co powder, a cubic phase powder and a WC powder, carrying out roller ball milling of the mixed powder, then drying, granulating and pressing the obtained slurry to obtain a half finished product, and then sintering to obtain the cemented carbide. The cemented carbide has relatively high hardness, toughness and strength, and the preparation method is simple in process and low in cost.

Description

technical field [0001] The invention relates to a carbide-based hard alloy and a preparation method thereof, in particular to a hard alloy with nearly spherical WC grains and a preparation method thereof. Background technique [0002] Materials for manufacturing metal cutting tools must have high high temperature hardness and wear resistance, necessary bending strength, impact toughness and chemical inertness, as well as 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, it is difficult to have both hardness and toughness of the material at the same time. Cemented carbide, which is commonly used as tool material, is a metal alloy with WC as the hard phase and Co as the binder phase. Its WC crystal grains have a triangular prism structure, and each crystal plane forms a sharp angle. It is easy to cause stress concentration, which reduces the strength and...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05B22F1/00
Inventor 黄文亮谢文黄前葆王社权汤爱民温光华
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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