We all know that alumina and zirconia are the two most commonly used precision ceramic raw materials, so how can precision ceramics made of silicon nitride, which is relatively unpopular, be applied?
Silicon nitride precision ceramics have very good impact resistance, so many automobile ball bearings are made of silicon nitride ceramics. These bearings are much harder than those made of metal and also reduce contact with the bearing track.
Since silicon nitride ceramic materials have very good thermal stability and wear resistance, good cutting tools are made of it. Compared with some metal knives, knives made of silicon nitride ceramics have stronger fracture toughness and thermal shock resistance, and it can easily cut cast iron, hard steel and nickel-based alloys.叧壣山dai
Silicon nitride fine ceramic materials can also make insulators and chemical barriers in integrated circuits. It is much better than silica and acts as a better diffusion barrier for water molecules and sodium ions. If it is a high-quality electronic product, the metropolis will use it to manufacture related materials.
Silicon nitride precision ceramic materials have high thermal stability, strong oxidation resistance and high dimensional accuracy of products. Since silicon nitride is a covalent compound with high bond strength and can form an oxide protective film in the air, it also has good chemical stability. It is oxidized, and is not infiltrated or corroded by many molten metals or alloys such as aluminum, lead, tin, silver, brass, nickel, etc., but can be corroded by molten liquids such as magnesium, nickel-chromium alloy, and stainless steel.
Silicon nitride precision ceramic materials can be used for high temperature engineering components, advanced refractory materials in metallurgical industry, corrosion-resistant components and sealing components in chemical industry, cutting tools and cutting tools in machining industry, etc.