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26 марта 2021 г. 06:02

Useful Knowledge Shared For Tungsten Carbide

carbide wear parts

With high hardness, excellent wear resistance & corrosion resistance, tungsten carbide has a high performance in the high-tech manufacturing field which has a strict requirement of quality, stability and reliability.

Characteristics of tungsten carbide

1. High hardness and wear resistance. Generally, between HRA86 ~ 93, decreases with an increase in cobalt.

2. Thermohardening. Under the temperature of 500°C is basically unchanged and there is still a high hardness at 1000°C.

3. High anti-bending strength. The bending strength at normal temperature is between 90 and 150 MPa and the higher the cobalt, the higher the anti-bending strength.

4. More stable chemical properties. Carbide material has acid-resistance, alkali-resistant, and even significantly oxidation even at high temperatures.

5. High thermal conductivity. Cemented carbide has higher thermal conductivity than that of high-speed steel, which increases with the increase of cobalt.

6. The coefficient of thermal expansion is relatively small. It is lower than high-speed steel, carbon steel and copper, and increases with the increase in cobalt.

The manufacturing method of tungsten carbide

The production of the cemented carbide is to mix tungsten carbide and cobalt in a certain proportion, pressurize into various shapes, and then semi-sintered. The sintering temperature is 1300-1500°C.

When manufacturing cemented carbide, the selected raw material powder has a particle size between 1 and 2 microns, and the purity is very high. The raw materials are mixed according to the specified composition ratio, and the medium is added into the wet ball mill to wet-grind them for making them fully mixed and crushed. After drying and sieving, the forming agent is added, and then the mixture is dried and sieved. Then, when the mixture is granulated and pressed, and heated to close to the melting point of the binder metal (1300-1500°C), the hardened phase and the binder metal will form a eutectic alloy. After cooling, a solid whole is formed. The hardness of cemented carbide depends on the hardened phase content and grain size, that is, the higher the hardened phase content and the finer the grains, the greater the hardness. The toughness of cemented carbide is determined by the bond metal. The higher the content of the bond metal, the greater the bending strength.

Hardness test of tungsten carbide

The cemented carbide is a metal, which can reflect the difference in mechanical properties in chemical components, tissue structures, and heat-treatment process. Therefore, the hardness test is widely used in the inspection of carbide properties, which can supervise the correctness of the heat treatment process and the research of new materials. The hardness detection of tungsten carbide mainly uses a Rockwell hardness tester to test HRA hardness values. The test has a strong shape and dimensional adaptability of the test piece with high efficiency.

For more professional information, please visit the introduction page of tungsten carbide knowledge .

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Автор: Статус: online pinkledstone
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