Silicon nitride ceramic is an inorganic ceramic material that does not shrink during sintering. The silicon nitride has high strength, especially hot-pressed silicon nitride, which is one of the hardest substances in the world. What’s more, silicon nitride ceramics have a Mohs hardness of 9 – 9.5 and a Vickers hardness of approximately 1550. Moreover, it has properties such as high strength, low density and high temperature resistance.
Silicon nitride (Si3N4) ceramics are one of the structural ceramic materials with the best comprehensive performance at present and it is known as the “all-round ceramic”. However, it will break over time in a working environment above 1200℃(2192℉), reducing its strength. It is also more prone to fatigue damage above 1450℃(2642℉). Therefore, the operating temperature of silicon nitride material and silicon nitride crucible generally does not exceed 1300℃(2372℉). In addition, silicon nitride oxide ceramic and aluminum nitride ceramics are widely used in aerospace, automotive, electronics and other fields.
Mechanical industry: bearings, high-speed turning tools, engine scrapers, guide vanes and turbine blades of gas turbines;
Metallurgical industry: crucibles, burners, castings, riser thermocouple temperature protection sleeves and aluminum electrolytic cell linings;
Chemical industry: ball valves, pump bodies, sealing rings, filters, heat exchanger components and evaporating dishes;
Semiconductor industry: circuit substrates, film capacitors or electrical insulators that withstand high temperatures or temperature changes;
Defense industry: radomes, missile tail nozzles, bulletproof armor, supports and isolation parts in atomic reactors;
Medical engineering: artificial joints.
The production process of silicon nitride ceramics mainly includes powder preparation, powder mixing and granulation, pressing and molding, green body machining, sintering, grinding and polishing and quality inspection. Among them, powder preparation and sintering are the two most core links. In addition, the quality of silicon nitride powder can greatly affect the final performance of silicon nitride ceramics.
In powder preparation, what Kerui pays the most attention to is the quality of raw materials. Therefore, we use high-purity silicon nitride as raw material for silicon nitride machining. Sintering molding is to sinter the green body in a high-temperature sintering furnace. This makes the ceramic particles bond to each other, the grains grow and the pores and grain boundary gaps are reduced. Finally, we make the silicon nitride insulator into a dense and hard polycrystalline ceramic body. For details on the production process, visit our Facebook homepage.
Kerui has achieved an efficient production process and effective cost control. This includes fine control of good refractory raw material selection, molding process and sintering process. Therefore, we have minimized silicon nitride ceramic costs while ensuring product quality.
Our factory is located in Chaohua Town, Xinmi City, Henan Province. This place is a well-known refractory town. Therefore, we are able to obtain high-quality and reasonably priced raw materials. This further reduces the cost for customers to purchase silicon nitride ceramics.
Kerui focuses on the balance between technology and cost-effectiveness in the design and manufacturing of fine ceramic and kiln shelf. This makes Kerui’s products not only technically competitive in the market but also more economical in silicon nitride price.
Kerui provides customers with tailor-made silicon nitride ceramic solutions through flexible production arrangements and responsive and high-quality services. This flexibility allows the products we sell to fully meet the application requirements of customers.