Nano and the structure of ultrafine cemented carbide

Ordinary structure cemented carbide wear resistance and toughness are mutually exclusive, coordinate this contradiction has always been a hard alloy research focus. Study found that in the cemented carbide binder phase content in certain circumstances, when the tungsten carbide (WC) grain size decreases to 0.8 mu m, not only the hardness of alloy to improve, and strength has improved, with the further decrease of grain size, increase more obvious.

This has both high hardness and high strength of cemented carbide cutting tool in machining hard and brittle materials, such as cold cast iron, etc.) when shows excellent performance. WC - 10 co of ultrafine cemented carbide hardness (HRA) can reach 93, transverse rupture strength is greater than 5000 mpa. Nano and ultra-fine grain cemented carbide with cemented carbide are far superior to the ordinary performance, meet the modern processing industry as well as for the new material processing requirements in the application of the special ability greatly enhanced. Nano and the structure of ultrafine cemented carbide "twin" (high abrasion resistance and toughness) performance, especially suitable for manufacturing to adapt to the high load and high stress abrasion, sharp, good rigidity, tools and moulds, such as printed circuit board (PCB) micro drill, V - CUT knife, cutter, etc.

On grain size of nanometer and the structure of ultrafine cemented carbide problem, there is no unified standard. It is generally believed that the grain size is less than 0.5 microns of cemented carbide for ultrafine cemented carbide, grain size is less than 0.2 microns of cemented carbide for nanometer cemented carbide. In this regard, Sweden Sandvik and classification standard of the German association of powder metallurgy relative authority.

Since the 1990 s, and how to refine the grain, the preparing ultrafine cemented carbide and nano results of research and development has become a hotspot in the field of cemented carbide technology all over the world. At Rutgers university in 1989, the first to successfully developed nano structure cemented carbide and patented. Cemented carbide, the advent of nanometer structure is in the field of cemented carbide landmark breakthrough, in order to solve the contradiction between the cemented carbide strength and hardness opens a new route.

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