Explanation

White powder crystal; melting point 190CTC, density 3.44g/cm (20 ℃), there are three kinds of crystal structures, respectively called α Type β Type and y type. among α The type is a hexagonal densely packed structure; β Type 7 phase with crystalloid structure can be synthesized only under high pressure and high temperature, and its hardness can reach 35GPa. silicon nitride is gray when it has impurities or excessive silicon. silicon nitride is an important structural ceramics materials. It is a superhard substance with inherent lubricity and wear resistance, and is an atomic crystal 1 body; antioxidant at high temperatures. Moreover, it can resist cold and hot shocks, and when heated to over 1000 ° C in the air, it will not shatter even after rapid cooling and heating. It is precisely because silicon nitride ceramics have such excellent characteristics that people often use it to manufacture mechanical components such as bearings, turbine blades, mechanical seal rings, permanent molds, etc. If we use silicon nitride ceramics that are resistant to high temperature but not easy to heat transfer to manufacture the heating surface of engine parts? Not only can it improve the quality of diesel engines, save fuel, but it can also improve thermal efficiency. China, the United States, Japan and other countries have developed this type of diesel engine.

Classification