Abstract Beijing University of Science and Technology recently introduced the preparation technology of nano-scale ultra-fine grained cobalt-free cemented carbide. The technology consists of three parts: The first part of the technology provides raw materials for the production of ultrafine particle WC powder. Only the particle size of WO3 powder is â‰¤500nm to ensure...
Beijing University of Science and Technology recently introduced nano-scale ultra-fine grain cobalt-free cemented carbide preparation technology, which consists of three parts:
The first part of the technology provides raw materials for the production of ultrafine particle WC powder. Only the particle size of the WO3 powder â‰¤ 500 nm can ensure that the particle size of the WC powder is â‰¤ 300 nm. At present, the first part of the technology can guarantee the production of 20-25Kg ultrafine particle WO3 powder (using ultrasonic thermal conversion technology) daily (24 hours).
The second part of the technology mainly provides WC powder with an average particle size of â‰¤300 nm. At present, a single design capability is guaranteed to produce 20 to 30 kg of 20 to 30 kg of WC powder per day (24 hours).
The third part of the technology is mainly guaranteed by various special molding equipment and special sintering equipment and corresponding operation technology. At present, conventional pressure changing and vacuum-medium pressure sintering processes have been mastered. After testing, the average grain size of WC powder of ultrafine grain cemented carbide is â‰¤50nm, the hardness of alloy is â‰¥90.7, and the bending strength of alloy is â‰¥3000N.
Because nano-scale cemented carbide has higher strength, hardness and wear resistance than conventional cemented carbide, it plays an important role in the modern industry. According to Japanese industry statistics, in the computer circuit board processing industry, 60 million pieces of nano-scale cemented carbide twist drills are needed each year (about 18 billion yen), but at present, Japan does not have nano-scale cemented carbide production technology, so only Can be replaced with (0.5 ~ 1.5Î¼m) micron-sized cemented carbide.
At present, 30 tons of micron-sized cemented carbide with high performance is quickly adopted by the computer industry. Other industries such as precision machinery, machining tools, special wear-resistant materials and parts, drawing dies, high-performance automated tools, optical components, etc. are in greater demand.
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