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26 апреля 2021 г. 12:30

Performance And Characteristics Of Tungsten Carbide

carbide wear parts

Tungsten carbide is an alloy which has the main components of tungsten carbide powder with metal bender. It is widely used for manufacturing high-speed carbide cutting tools for hard, tough materials. The high-performance tungsten carbide has excellent characteristics.

1. High hardness and excellent wear resistance

The hardness of cemented carbide can reach 86 to 93HRA, which is equivalent to 69 to 81HRC. High hardness can be maintained at 900-1000 ℃ with excellent wear resistance. Compared to high-speed steel, the cutting speed can be 4-7 times higher with 5-8 times service life, which can cut hard material with a hardness of 50 HRC.

2.High strength and high elastic modulus

The tungsten carbide has a compressive strength of up to 6000 MPa and an elastic modulus (4 ~ 7) × 105 MPa, which both are higher than high-speed steel. However, its bending strength is low, typically 1000 ~ 3000MPa.

3. Excellent corrosion resistance and oxidation resistance

It is generally resistant to atmospheric, acid, alkali and is not easy to oxidize. There is a wide range of applications in the industries of fluid and chemical, such as various valves used for fluid control including regulating valves, black water valves, lock slag valves, and decompression noise reduction valves, etc.

4.Small linear expansion coefficient

When the tungsten carbide products are working, the shape size the stable

5.The finished products are no longer processed with re-grinding

Due to the high hardness and brittleness, the powder metallurgical formation is no longer cutting or re-grinding, and when the demand is re-processing, it can adopt electric sparks, line cutting, electrolytic grinding and other electric processing or special grinding wheel cutting. It is usually used by a certain specification paper made of cemented carbide, adopting brazing, bonding or mechanical clamping for the blade body or mold.

How To Improve The Performance Of Tungsten Carbide

In order to adapt to the harsh environment under different working conditions, tungsten carbide often needs to be reprocessed to make corresponding changes for the original performance, so what are the methods to change the performance of tungsten carbide?

1. Improve the quality of raw materials

Improve the purity of raw materials

High-strength, high-impact toughness alloys have high requirements for the purity of raw materials, while continuous cutting tool with low impact load but high machining accuracy, have low requirements for raw material purity.

Control the particle size and distribution of raw materials

It should avoid excessively large particles in the carbide or cobalt powder raw materials, and prevent the tungsten carbide from forming coarse carbide grains and cobalt pools during sintering.

At the same time, the size and composition of the particle materials should be controlled to meet the needs of different products. For example, carbide cutting tools should adopt tungsten carbide powder with a fisher particle size of less than 2 microns, wear-resistant tools should use tungsten carbide powder with a particle size of 2-3 microns, and mining tools should adopt tungsten carbide powder with the particle size of larger than 3 microns.

2. Improve the structure of the tungsten carbide

3. Improve or select new hard phase and binder phase

The performance of tungsten carbide is affected by the composition and structure of the hard phase and the binder phase. Generally speaking, when the content of the hard phase is high and the grains are finer, the hardness is high and the wear resistance is good, with poor impact resistance. Improving the hard phase and the binder phase is one method to change the performance.

4. Surface hardening treatment

To solve the contradiction between wear resistance and toughness, hardness & strength of tungsten carbide, surface hardening treatment can be adopted.

The coating is physically or chemically depositing a layer of TiC or TiN on the surface of the cemented carbide to increase the wear resistance. The most rapid development at present is the coated tungsten carbide.

5. Add elements or compounds

6. Heat treatment

For more useful knowledge, please visit the article page of high performance tungsten carbide

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Автор: Статус: offline pinkledstone
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