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What is the Tungsten Carbide?

Time : 2022-02-22 Hits : 15

The theoretical carbon content of tungsten carbide is 6.128% (atomic 50%). When the carbon content of tungsten carbide is greater than the theoretical carbon content, free carbon (WC+C) appears in the tungsten carbide, and the presence of free carbon makes the surrounding carbonization during sintering. Tungsten grains grow, resulting in uneven grains of cemented carbide; tungsten carbide generally requires high compound carbon (≥6.07%) free carbon (≤0.05%), and the total carbon depends on the production process and application range of cemented carbide.

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The requirements of cemented carbide on the particle size of tungsten carbide WC, according to the cemented carbide for different purposes, use different particle sizes of tungsten carbide; cemented carbide cutting tools, such as cutting edge V-CUT knife, etc., the finishing alloy is made of ultra-fine Fine-grained tungsten carbide; medium-grained tungsten carbide is used for rough machining alloys; medium-coarse-grained tungsten carbide is used as raw material for gravity cutting and heavy-duty cutting alloys.

Coarse-grained tungsten carbide is used for mining tools with high rock hardness and large impact load; medium-grained tungsten carbide is used as raw material for wear-resistant parts when rock has small impact and small impact load; when its wear resistance, compression resistance and surface finish are emphasized, ultra-fine sub-fine Fine and medium grain tungsten carbide is used as raw material; impact-resistant tools are mainly made of medium and coarse grain tungsten carbide.

Storage: It should be stored in a cool and dry warehouse. During transportation, the packaging container should be kept intact and protected from rain and sunlight.

Packaging, storage and transportation: The product is packed in iron drums (plastic drums) lined with polyethylene plastic bags, and the net weight of each bag should not exceed 50kg. The words "moisture-proof" and "upward" should be displayed on the outer packaging drum. The product should be stored in a cool and dry warehouse. During transportation, pay attention to the packaging container in good condition and prevent rain and sunlight exposure.

Uses:
1. It is widely used as high-speed cutting turning tools, furnace structural materials, jet engine components, metal ceramic materials, resistance heating elements, etc.
2. It is used to manufacture cutting tools, wear-resistant parts, melting crucibles for metals such as copper, cobalt and bismuth, and wear-resistant semiconductor films.
3. It is used as super hard tool material and wear-resistant material. It can form solid solutions with many carbides. WC-TiC-Co carbide tools have been widely used. It can also be used as a modified additive for NbC-C and TaC-C ternary system carbides, which can not only reduce the sintering temperature, but also maintain excellent properties, and can be used as aerospace materials.
4. Tungsten carbide (WC[9]) powder is synthesized by using tungsten anhydride (WO3) and graphite at a high temperature of 1400-1600℃ in a reducing atmosphere. Dense ceramic products can be obtained by hot pressing sintering or hot isostatic pressing sintering.