Superfine Tungsten Carbide Powder
According to the definition of the national standard GB/T 26725-2011 of the People's Republic of China "Superfine Tungsten Carbide Powder" (see the attachment for details), in general, this standard is applicable to the production of cemented carbide and other powder metallurgy products. Ultrafine tungsten carbide powder. Ultrafine tungsten carbide powder products refer to tungsten carbide powders with an average particle size between 0.2 and 0.6 μm. Nano tungsten carbide powder products refer to powders with an average particle size of less than 0.1 μm. The appearance of ultrafine tungsten carbide powder is dark gray and uniform in color , no daylight-visible inclusions. Since GB/T 4295 "Tungsten Carbide Powder" has already included the standard of 0.2,0.6μm tungsten carbide powder, ultra-fine tungsten carbide powder in this standard refers to tungsten carbide powder with an average particle size range of 100nm.
The National Standard of the People's Republic of China GB/T 26725-2011 "Superfine Tungsten Carbide Powder" (see the attachment for details) is mainly about the requirements, test methods, inspection rules, marking, packaging, transportation and storage of superfine tungsten carbide powder and the content of the contract. The main content of the standard includes product classification, average particle size, specific surface, total carbon, free carbon, combined carbon, oxygen content and Al, Ca, Fe, K, Mg, Mo, Na, S, Si and other impurity elements.
Tungsten carbide powder with an average particle size of less than 100nm belongs to ultra-fine tungsten carbide powder, and the range is relatively wide. In the actual production and trading process, there will be problems such as various applications and sales prices. Therefore, ultra-fine tungsten carbide powder products are divided into Three grades: FWCN20, FWCN50, FWCN80, the corresponding average particle size is 50nm, 50, 80nm, 80, 100nm, and the corresponding specific surface area requirements are: 7.60m/g, 7.60, 4.77m/g, 4.77, 3.80 m/g. The values of total carbon, free carbon, combined carbon and oxygen content of ultra-fine tungsten carbide powder are determined according to the actual production situation, while meeting the requirements of the follow-up process and maintaining the advanced nature. The continuation of "Tungsten Carbide Powder".
Superfine tungsten carbide powder/nano tungsten carbide powder specification grade classification table
In order to ensure the quality of the subsequent processing products of ultra-fine tungsten carbide powder, when the production capacity permits, the requirements for the content of impurity elements in the ultra-fine tungsten carbide powder standards are higher than those of ordinary tungsten carbide powders, and the requirements for impurity elements in this standard are higher than GB /T 4295 "Tungsten carbide powder" has stricter requirements for impurity elements, Al, Ca, Fe, K, Mg, Mo, Na, S, Si Other impurity elements are formulated according to the actual production situation and the degree of influence on the subsequent production process. The specific requirements for impurity elements are as follows.
The impurity content specified in the ultra-fine tungsten carbide powder standard mass fraction/%
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