How to deal with scrap cemented carbide

Cemented carbide is in a certain temperature after a protective gas for sintering. If at higher sintering temperature and placed in a protective atmosphere to heating alloy, carbide volume expansion will occur, as the deterioration of metal drill will be liquefied boiling, such as the volume of the alloy will become loose and porous, hard alloy becomes extremely easily broken processing, after crushing and grinding, can be the same as the original carbide tungsten carbide and binder mixtures. The principle of high temperature processing method is the use of special high temperature furnace, in turn far outweigh carbide sintering temperature 0 ℃ hard cuny beside the metal from the alloy structure to collapse.

 

Adopting this process to get the carbide renewable raw materials due to the high temperature treatment, originally contained traces of other metals and non-metallic impurities and harmful gas was stripped away, tungsten carbide grain grew up long thick, obviously intracrystalline defect reduction, alloy structure and performance has improved, so has good mechanical performance and longer service life.The recycled mixture is suitable for the grain is relatively coarse, containing a high percentage of drill carbide. For the crystal grain more fine, types of carbide drill content is low, not only in the temperature of the high-temperature processing to improve, in order to make the expansion of scrap cemented carbide have enough stress loose phenomenon, and in the making of fine grained cemented carbide, corresponding to change the mixture preparation and sintering process. High temperature processing method has short process flow, equipment, simple recycling carbide mixture is clean, the environmental pollution is small, the characteristics of the recovery rate is higher, but the process energy consumption high, part of the drill will be lost in the process of high temperature, etc., the biggest problem is only appropriate to make recycled mixture is bulky grain carbide alloy. At present, some developed countries such as Japan, Sweden, some manufacturers still use the method of waste carbide.