Sintering method of binderless pure tungsten carbide products
Usually the tungsten carbide product refers to the mixing of tungsten carbide powder with cobalt powder or other binder powder. Then it can be formed by ordinary sintering furnace to make a tungsten carbide product with high wear resistance and high strength. However, to make a pure tungsten carbide product with ultra-fine density and higher hardness without a binder phase, it is shown that the ordinary sintering method is not feasible. But the SPS sintering method solves this problem.
?Spark Plasma Sintering (SPS), also known as "Plasma Activated Sintering" (PAS), is a new technology for preparing functional materials.
? SPS technology is to heat and sinter by directly passing pulse current between powder particles. The process advantages of SPS are very obvious: uniform heating, fast heating rate, low sintering temperature, short sintering time, high production efficiency, ?little and uniform product structure, maintaining the natural state of raw materials, and obtaining high density and high hardness materials. Therefore, this method It is the most suitable for sintering pure tungsten carbide products.
Of course, for actual production, in addition to the need to develop powder materials suitable for SPS technology like tungsten carbide, it is also necessary to develop new mold materials with higher strength and better ruesability than the currently used mold material (graphite) to improve the load-carrying capacity of the mold and the cost of the mold are reduced.
In terms of technology, it is necessary to establish the temperature difference relationship between the mold temperature and the actual temperature of the work piece in order to better control the product quality. In terms of performance testing of SPS products, it is necessary to establish standards and methods suitable for them.
If you need binderless tungsten carbide products that pls contact :
Nancy Xia [email protected]