High temperature and thermal shock resistant silicon nitride ceramic mirror polished round rod

High temperature and thermal shock resistant silicon nitride ceramic mirror polished round rod is a high-performance engineering ceramic material, characterized by excellent high temperature resistance, thermal shock resistance, high hardness, high wear resistance, and good chemical stability. This product adopts advanced manufacturing technology, undergoes precision machining and mirror polishing treatment, has high surface smoothness, and is suitable for working environments with various high-temperature, high-speed, and strongly corrosive media.

Main characteristics
High temperature resistance: Silicon nitride ceramics (Si3N4) have no melting point at normal pressure and decompose directly at around 1870 ℃. They can withstand oxidation up to 1400 ℃ and can be used at temperatures up to 1200 ℃ (mechanical strength will decrease above 1200 ℃). In a protective atmosphere, it is recommended to use temperatures up to 1400 ℃.
Thermal shock resistance: Silicon nitride ceramics have excellent thermal shock resistance and will not crack under thermal shock from room temperature to 1000 ℃. This is due to its small coefficient of thermal expansion (2.8-3.2 × 10-6/℃) and high thermal conductivity.
High hardness and wear resistance: Silicon nitride ceramics have a hardness second only to diamond, cubic boron nitride, boron carbide, and carbon carbon composite materials, and have extremely high wear resistance.
Good chemical stability: Silicon nitride ceramics are not resistant to hydrofluoric acid and concentrated NaOH corrosion, but can withstand corrosion from all inorganic acids, certain alkaline solutions, molten alkalis, and salts. In addition, it can resist the erosion of molten metals such as aluminum, lead, tin, silver, brass, nickel, etc., but can be corroded by molten liquids such as magnesium, nickel chromium alloys, stainless steel, etc.
Mirror polished surface: The product has undergone precise mirror polishing treatment, resulting in high surface smoothness, which can reduce friction and wear and improve service life.

Product specifications
Maximum production size: length ≤ 1200mm, diameter ≤ 300mm, thickness ≤ 50mm.
Shape: Round bar shaped, products can be customized with different lengths, diameters, and thicknesses according to customer needs.
Density: Depending on the process, the density range of the material is between 3.1-3.3g/cm ³.

application area
Metallurgical industry: used for manufacturing components on thermal equipment such as crucibles, muffle furnaces, combustion nozzles, heating element fixtures, molds, aluminum liquid conduits, thermocouple temperature protection sleeves, aluminum electrolytic cell liners, etc.
Mechanical industry: used for manufacturing high-speed cutting tools, bearings, supports for heat treatment of metal parts, rotor engine blades, guide vanes and turbine blades for gas turbines, etc.
Chemical industry: used for manufacturing ball valves, pump bodies, sealing rings, filters, heat exchanger components, fixed catalyst carriers, combustion boats, evaporating dishes, etc.
Semiconductor, aviation, and atomic energy industries: used for manufacturing switch circuit substrates, thin film capacitors, electrical insulators that can withstand high temperatures or drastic temperature changes, radar antenna covers, missile tail nozzles, support and isolation components in atomic reactors, carriers of nuclear fission materials, etc.
Other fields: It can also be used to manufacture artificial joints, as well as fully ceramic engines made of silicon nitride that are currently under development.

Precautions for use
Temperature control: Although silicon nitride ceramics have excellent high temperature resistance, excessive surface temperature should be avoided as much as possible during use to avoid accelerated oxidation and shortened service life.
Dust prevention measures: Effective dust prevention measures should be taken during the mining, crushing, processing, transportation, and storage of ceramic raw materials and glaze minerals to reduce dust diffusion and personnel contact.
Installation method: It is recommended to use the heating method to install ceramic bearings or ceramic bearing seats, and use thermal expansion to transform the tight fit into a loose fit, which is both labor-saving and reliable.
Storage and transportation: Ceramic products should be handled with care to avoid collisions and scratches. When storing, it should be stored separately in the warehouse or material shed according to the variety, specification, grade, and manufacturer, and kept dry and clean.

High temperature and heat-resistant silicon nitride ceramic mirror polished round rod has become an indispensable high-performance material in modern industry due to its excellent performance and wide application fields. We are committed to providing customers with high-quality products and services to meet their various needs. If you have any questions or customization needs, please feel free to contact us at any time.