成人a毛片手机免费播放-成人a毛片在线看免费全部播放-成人a视频高清在线观看-成人a视频片在线观看免费-欧美三级中文字幕hd-欧美三极

Metal tungsten carbide powder has a good conductive thermal conductivity and high melting point. It is an important raw material for the preparation of tungsten carbide, which can be heated by a mixture of tungsten and carbon. Preparation Metal tungsten carbide powder can be heated by a mixture of tungsten and carbon, and the presence of hydrogen or hydrocarbons can accelerate the reaction. If use oxygen containing compounds in the preparation of tungsten, vacuum products must eventually in 1500 ℃,…

Supermicro tungsten carbide powder as a “micro-tungsten particle bullet”, due to fine particles, permeability, good dispersion, bio-genetic engineering provides a new and effective method, can be prepared by one-step reduction carbonization. Preparation In the preparations of supermicro tungsten carbide powder, one step reduction carbonization method can be used in addition to the traditional process. One-step reduction carbonization method is a method suitable for industrial scale production, using the precursor powder containing tungsten as a direct step to restore carbonized tungsten…

Micron tungsten carbide powder has excellent wear resistance and high temperature oxidation resistance. It is widely used in traditional applications and high-tech fields. Application Due to its special properties and uses, it also plays an important role not only in traditional applications but also in high-tech fields. Ultrafine cemented carbide is made of micron tungsten carbide powder with high toughness, high strength, high hardness and high wear resistance. In addition to processing into a sharp edge for the processing of…

Superfine tungsten carbide powder has good compatibility, which can improve the sharpness of the tool, and it can be prepared by one-step reduction carbonization method. Characteristic Superfine tungsten carbide powder has good compatibility with iron, copper, cobalt and nickel, which can increase the wear resistance of the tire body, reduce the variation of the matrix, and improve the sharpness of the tool. Preparation Compared with the traditional process, a one-step reduction carbonization method is used to prepare superfine tungsten carbide…

Fine particle tungsten carbide powder has smaller particle size, high specific surface area and good catalytic activity. It can replace precious metal as catalyst, but also can be used as raw material for the production of tungsten carbide. Particle The main influencing factors of fine particle tungsten carbide powder are the particle size and the composition of the tungsten powder. Due to the carbonization process is mainly achieved by the reaction of the surface of the tungsten powder particles with…

Nanometer tungsten carbide powder is a kind of tungsten carbide powder with a particle size <100nm, which has the properties of the abnormal tungsten carbide powder. It can make the tungsten carbide with more excellent properties. Particle When the particle size of the tungsten carbide powder varies greatly, the characteristic of the powder is obviously different. Especially when the particle size reaches the nanometer level, it often shows the abnormal performance of the conventional tungsten carbide powder. Applications Nanometer tungsten…

Ultrafine tungsten carbide powder is tungsten carbide powder with particle size ≤0.5μm. It is the basic raw material for the production of ultrafine-grained tungsten carbide. It should be sealed in vacuum and cannot be stored for more than 8 months. Particle The particle size of the ultrafine tungsten carbide powder can be measured by using the microscope (SEM, TEM), the laser particle size method, the X-ray line width method and the specific surface area method. The combination of several measurement…