Silicon Nitride With Excellent Performance

Specification granularity: natural block, 10-100mm, 10-60mm, 3-10mm, 1-3mm, 0-1mm, or customized according to customer requirements.

Packaging: Ton bag packaging (1000kg/bag) or customized according to customer requirements.

Silicon nitride (Si3N4) is an inorganic substance composed of silicon and nitrogen, with the chemical formula Si3N4. It is an important structural ceramic material. It has two main crystal forms: α-Si3N4 and β-Si3N4. The former is granular crystal and the latter is needle-shaped crystal. Both belong to the hexagonal system.

Silicon nitride has high hardness, second only to diamond and cubic boron nitride, and has extremely high bending strength. Silicon nitride itself has lubricity, low friction coefficient and wear resistance. Silicon nitride has excellent thermal stability and strong oxidation resistance. The thermal oxidation resistance temperature can reach 1400℃, the operating temperature can reach 1200℃, and the operating temperature can reach 1800℃ in a neutral or reducing atmosphere. In addition, silicon nitride has low thermal expansion and can be used in extremely cold and hot working environments. Silicon nitride has good chemical stability, can withstand most acid erosion, and is not wetted or corroded by many molten metals or alloys such as aluminum, lead, tin, silver, brass, and nickel.

Silicon nitride combined with silicon carbide refractory products are widely used in furnace waist, furnace belly, furnace body and other parts. In the steelmaking process, silicon nitride refractory materials are used in the slide plate material at the bottom of the ladle, which improves the wear resistance, erosion resistance and service life of the slide plate. In transportation tools such as torpedo cars, silicon nitride refractory materials are used for lining, which improves its corrosion resistance, wear resistance and erosion resistance. In the smelting process of non-ferrous metals such as aluminum, copper, and zinc, silicon nitride ceramics are used to manufacture high-temperature components such as temperature measuring thermocouple sleeves, smelting furnace linings, container linings, crucibles, etc. The non-wetting property of silicon nitride with metal solutions makes it perform well in these environments.

In the sanitary ceramics, daily ceramics, electronic ceramics, architectural ceramics and other industries, silicon nitride combined with silicon carbide refractory materials as kiln furniture materials improves firing efficiency and product quality. Kiln furniture materials such as silicon nitride rollers perform well at high temperatures, extend service life and reduce energy consumption. The working environment of waste incinerators is complex, requiring refractory materials to have good high temperature strength, wear resistance, acid and alkali corrosion resistance, thermal shock stability, etc. Silicon nitride combined with silicon carbide materials have been widely used in waste incinerators and have performed well.

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