China Made a Process in High-performance Tungsten Carbide

Chinese R&D team in tungsten carbide has a breakthrough in the research and development of high-performance tungsten carbide composite material, it mainly includes:

1. Phase controlled particle size adjustable nano WC-Co composite powder scale preparation techniques: It takes tungsten-cobalt oxide and carbon as raw material, and uses solid-phase synthesis in-situ reaction to synthesize ultrafine or nano WC-Co composite powder. It has many advantages, such as simple operation, short process, Low-cost equipment, energy saving and so on. The synthesis of composite powder has high purity, low oxygen content, Co content within a wide range of 6-20wt% is accurate and adjustable, which reached on the current international quality ultrafine nano WC-based powder control standards.

2. High liquidity, nano-structure WC-based spraying powder scale preparation techniques: It based on the principle of spray-drying and combines with heat treatment, which not only maintains the characteristics of nano structure, but also can fabricate the thermal spray powder with high fluidity. So it gets to the root of nano powder thermal spraying at high temperature flame flow easily decomposed decarbonization, which is a difficulty in international technical fields.

3. High density, high surface quality and technical preparation of carbide wear and corrosion coating: The technology synergistically adjust the initial powder component, thermal spray granulation and agglomeration process, by a combination of carbon content design, unique heat treatment process, recombinant size, thermal spraying process parameters optimization to fabricate high-performance nano-structure carbide coating. The coating having a porosity of <0.5% of a high density; compared with the conventional micro structure, the surface quality has significantly improved, the surface roughness Ra <0.5m.

4. Ultrafine size nano-crystalline tungsten carbide block preparation: The technology develops a low-temperature region slow heating rate, low pressure, high temperature rapid heating region segmentation, greater pressure, does not heat the unique field effect sintering process. And produces nano tungsten carbide block with average grain size of 60-100nm. The average grain size of 60nm dense nano-crystalline alloy is the smallest grain size reported so far around the world. Meanwhile, nano-crystalline tungsten carbide sintered material can meet the requirements of high hardness and high fracture toughness.

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