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

Due to its extremely high melting point, excellent high-temperature mechanical properties and good chemical stability, tungsten crucible is widely used in high-temperature experiments in aerospace, metallurgy, materials science and other fields, especially in crystal growth, metal smelting and rare element extraction, etc., which plays a key role. However, in the actual use process, tungsten crucibles are not “indestructible”, and will still fail in different forms due to a variety of complex factors. First, thermal fatigue cracking is one of the…

As a metal with a high melting point, tungsten is widely used in high-temperature smelting, single crystal growth, vacuum evaporation and other industrial fields due to its excellent thermal stability, corrosion resistance and high strength. As an important vessel carrying high-temperature materials, the surface condition of tungsten crucible has a direct impact on service life, product purity and operation efficiency. Therefore, the surface treatment technologies for W crucibles have attracted extensive attention in recent years, and a variety of targeted…

Tungsten crucibles play an important role in high-temperature metallurgy, crystal growth, vacuum smelting and other fields, and have long been known for their excellent high temperature resistance and good chemical stability. However, with the increasing complexity of the application environment, more and more users have begun to pay attention to its wear resistance. Abrasion resistance, as an index to measure the ability of materials to resist surface damage under mechanical actions such as friction, impact, and grinding, is a performance…