Silicon nitride ceramic ball is a kind of precision ceramics sintered at high temperature in non-oxidizing atmosphere, with high strength, high wear resistance, high temperature, corrosion resistance, acid and alkali resistance and other excellent properties. Its density is 3.20g/cm³, about 1/3 of the weight of bearing steel, small centrifugal force when rotating, suitable for high-speed operation. In addition, silicon nitride ceramic balls are also self-lubricating, suitable for non-lubricating media and high pollution environment.
MATERIAL : Si3N4
DENSITY : 2.8
COLOR : Black / Blue / White
HRDNESS(Mohs scale) : 9
MAX WORKING TEMPERATURE : 1650
▼Performance characteristic
1.Small density, small centrifugal force, more conducive to high-speed operation
The density of silicon nitride ceramic material is about 3.2, while the density of steel bearing is about 7.8. The density of silicon nitride ceramics is only about 40% of the density of steel bearing. Therefore, when the rolling element uses silicon nitride ceramics, the bearing can effectively suppress the increase in the rolling element load caused by the centrifugal force when the bearing rotates at high speed. Therefore, the use of low-density silicon nitride balls is more conducive to the development of high-speed bearings.
2.Heat resistance, can adapt to higher temperature working conditions
Generally, when the operating temperature of steel bearings exceeds 120°C, the hardness will decrease and the rolling life will also decrease. For example: the service temperature limit of M50 high-temperature steel bearing is about 400℃. When this temperature is reached, the hardness of the steel decreases greatly. However, silicon nitride completely maintains its original hardness in this temperature range. Only at about 800℃, its hardness and strength began to decline. Therefore, for bearings used in high-temperature environments, silicon nitride materials are very suitable. For example: aviation jet engines, gas turbines, nuclear reactor systems, X-ray tube tungsten disks, and rockets and spacecraft.
3.small linear expansion coefficient, can be used in the field of environmental temperature changes
The linear expansion coefficient of silicon nitride is about 1/4 of that of steel bearing, so the dimensional change of silicon nitride bearing material with temperature changes is small.
Anti-locking: Therefore, the bearing made of silicon nitride ceramic material can effectively prevent the bearing material from "locking" due to temperature changes and dimensional changes. So as to ensure the stable operation of the equipment and reduce the loss due to equipment failure.
4.Excellent self-lubricating performance
Silicon nitride ceramic material itself has the functions of anti-friction, anti-wear and lubrication. Under bad lubrication conditions, such as oil-lean lubrication and oil-free dry friction, it shows superior anti-friction and self-lubricating performance. It has a good emergency state, which can effectively avoid losses caused by sudden equipment failures.
The self-lubricating mechanism of silicon nitride is still controversial. At present, some scholars believe that the main reason for this characteristic is that silicon nitride decomposes in a small amount during the friction process and forms a very thin film on the surface, thereby reducing the frictional resistance. And as the friction continues, the friction surface becomes more and more smooth, and the resistance becomes smaller and smaller, which has the effect of lubricating and reducing wear.
5.Stable chemical properties-corrosion resistance
Silicon nitride has good chemical resistance to most acids, such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and alkali. Only hydrofluoric acid or a mixture of hydrochloric acid and nitric acid can corrode silicon hydride.
Therefore, the bearing material made of silicon nitride can be exposed to corrosive acid, alkali, salt and other solutions for a long time. Compared with steel bearings, its average life will be 4-25 times longer than stainless steel bearings. It can be applied to machinery used in chemical machinery equipment, food, marine, sewage treatment and other departments to reduce the trouble caused by corrosion.
6.Non-magnetic, insulating
In a strong magnetic environment, when steel bearings are used, the fine powder worn down from the bearing itself is adsorbed on the rolling elements and rolling surfaces, which will become the main cause of early spalling damage and increased noise.
The use of bearing steel to prepare the bearings of the railway vehicle traction motor will cause electric corrosion, which will reduce the life of the traction motor bearing. The use of insulated full ceramic silicon nitride bearing materials can effectively improve the impact of electrical corrosion on the bearing.
▼Field of application
1. Mechanical field: silicon nitride ceramics are widely used in the mechanical field to manufacture valves, pipes, grading wheels, ceramic cutters, bearing balls, etc. Its low density, high temperature resistance, self-lubrication and corrosion resistance make it widely used in high-speed machine tool spindle high-speed bearing, aerospace engine, wind turbine bearing, automotive engine bearing and other equipment.
2. Semiconductor field: silicon nitride ceramic has excellent thermal conductivity and high thermal conductivity, making it an ideal material in semiconductor packaging field. Silicon nitride substrates have excellent performance in integrated circuits, high thermal conductivity, high bending strength and good thermal matching, suitable for high-performance power modules.
3. Bioceramic field: As a new generation of bioceramic materials, silicon nitride ceramic has good radiographic imaging performance, anti-infection performance and biocompatibility, and is widely used in biological sensors, spine, orthopedics and dental implants.
4. Wave transmitting material field: silicon nitride ceramics and their composite materials have excellent performances such as heat resistance, wave transmitting and bearing, and are used to manufacture high performance wave transmitting materials such as radome and antenna window.
Application Examples of Silicon Nitride Ceramics
5. Bearing: silicon nitride ceramic bearing ball has the characteristics of low density, wear resistance, high temperature resistance, corrosion resistance and self-lubrication, especially suitable for high-speed rotating bodies, such as high-speed bearing of high-speed machine tool spindle, aerospace engine bearing, etc.
6. Substrate: in the semiconductor field, silicon nitride substrate is widely used in packaging of high-performance power modules due to its high thermal conductivity, high bending strength and good thermal matching.
7. Implants: Silicon nitride ceramics are used in the biomedical field to manufacture spinal intervertebral fusion devices, orthopedic and dental implants, etc., with good biocompatibility and anti-infection performance.
Transparent material: silicon nitride ceramic and its composite materials are used to fabricate radome and antenna window, which have excellent transparent performance and high temperature resistance.
▼Technical Properties of Si3N4 Silicon Nitride Ceramic
Silicon nitride ceramic ball is a kind of precision ceramics sintered at high temperature in non-oxidizing atmosphere, with high strength, high wear resistance, high temperature, corrosion resistance, acid and alkali resistance and other excellent properties. Its density is 3.20g/cm³, about 1/3 of the weight of bearing steel, small centrifugal force when rotating, suitable for high-speed operation. In addition, silicon nitride ceramic balls are also self-lubricating, suitable for non-lubricating media and high pollution environment. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic substrate is a kind of high performance and high stability ceramic substrate material, mainly composed of silicon nitride powder synthesized by silicon and nitrogen elements adding a small amount of oxides and rare earth sintered . It has the advantages of high hardness, high strength, low thermal expansion coefficient, low creep at high temperature, good oxidation resistance, high thermal corrosion performance, low friction coefficient, etc. is one of the best structural ceramic materials with comprehensive performance MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic bolt is a kind of bolt made of silicon nitride (Si3N4) material, which has excellent high temperature resistance, corrosion resistance and mechanical properties. Silicon nitride ceramic bolts perform well at high temperatures, maintain high strength at 1200 ° C, and only break down at 1900 ° C . In addition, it also has good chemical resistance, able to resist almost all inorganic acids (except hydrofluoric acid) and less than 30% caustic soda solution MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic rods perform well in high temperature environments, have good heat shock resistance, and can maintain high strength and impact resistance at high temperatures. Its decomposition temperature is 1800℃ in the air, up to 1850℃ in nitrogen, and it will not break after being heated in cold water at 1000℃ . Silicon nitride ceramics have high thermal conductivity and low coefficient of thermal expansion, which makes them have excellent heat shock resistance at high temperature MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Si3N4 Silicon Nitride has the most versatile combination of mechanical, thermal, and electrical properties of any technical ceramic material. It is a high performance technical ceramic that is extremely hard and has exceptional thermal shock and impact resistance. It surpasses most metals high temperature capabilities and has a superior combination of creep and oxidation resistance. Additionally, its low thermal conductivity and high wear resistance make it an excellent material that can withstand the toughest of conditions in the most demanding industrial applications. Si3N4 Silicon Nitride is an excellent choice when high-temperature and high-load abilities are needed. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
The Mohs hardness of silicon nitride ceramics is usually above 9, which makes it excellent in wear resistance and scratch resistance , enough to keep its physical and chemical properties stable at extreme high temperatures, melting point of more than 2700℃, can still maintain good mechanical strength and dimensional stability at high temperatures. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
The Mohs hardness of silicon nitride ceramics is usually above 9, which makes it excellent in wear resistance and scratch resistance. enough to keep its physical and chemical properties stable at extreme high temperatures,the long-term operating temperature can reach 1200°C (short-term 1400°C), and it is suitable for environments with molten metals, glass or high-temperature gases. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Si3N4 Silicon Nitride Ceramic is dark gray to black in color and can be polished to a very smooth reflective surface, giving parts with a striking appearance. The very high quality bodies developed for these demanding high reliability applications are available today and can be used in many mechanical, thermal and wear applications. What's more, Si3N4 Silicon Nitride is an electrical insulator and is not wet by nonferrous alloys. Silicon Nitride Ceramic is a rather expensive material, but it’s performance to cost benefit ratio is excellent in the applications where it can outperform the normally utilized materials with long life and very reliable low maintenance operation. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic is a kind of made of silicon nitride (Si3N4) material, which has excellent high temperature resistance, corrosion resistance and mechanical properties. Silicon nitride ceramic perform well at high temperatures, maintain high strength at 1200 ° C, and only break down at 1900 ° C . In addition, it also has good chemical resistance, able to resist almost all inorganic acids (except hydrofluoric acid) and less than 30% caustic soda solution MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic bearings can maintain stable mechanical properties at high temperatures up to 1400 ° C. Compared with traditional ceramics, silicon nitride ceramics show higher strength and toughness, and can withstand greater impact and loads . MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Technial Ceramics are used to make the welding guide pins, which are used for projection welding and resistance welding in automotive industry. Ceramic pins are electrical insulated and high thermal shock resistant. Besides, they can be used up to 1,200 degree C. So they offer much longer service life and higher economic efficiency. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic piston is a kind of high performance material, with high bulk density, high thermal shock resistance, high hardness and high temperature resistance. These characteristics make silicon nitride ceramic pistons perform well in extreme environments and are widely used in various industrial fields. MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic is a kind of made of silicon nitride (Si3N4) material, which has excellent high temperature resistance, corrosion resistance and mechanical properties. Silicon nitride ceramic perform well at high temperatures, maintain high strength at 1200 ° C, and only break down at 1900 ° C . In addition, it also has good chemical resistance, able to resist almost all inorganic acids (except hydrofluoric acid) and less than 30% caustic soda solution MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic rings are usually manufactured by hot press sintering process . This process sintering silicon nitride powder under high temperature and high pressure conditions significantly improves the density and mechanical properties of the material. By optimizing the hot press sintering process, the overall performance of silicon nitride ceramic rings can be further improved, making it more suitable for harsh industrial needs MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic bolt is a kind of bolt made of silicon nitride (Si3N4) material, which has excellent high temperature resistance, corrosion resistance and mechanical properties. Silicon nitride ceramic bolts perform well at high temperatures, maintain high strength at 1200 ° C, and only break down at 1900 ° C . In addition, it also has good chemical resistance, able to resist almost all inorganic acids (except hydrofluoric acid) and less than 30% caustic soda solution MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
Silicon nitride ceramic structure is a kind of ceramic material composed of silicon and nitrogen elements, chemical formula Si3N4, with unique crystal structure and excellent physical and chemical properties . Its basic structural unit is the tetrahedron [SiN4], the silicon atom is located in the center of the tetrahedron, surrounded by four nitrogen atoms, forming the form of one atom for every three tetrahedra, forming a continuous and sturdy network in three-dimensional space MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
The Mohs hardness of silicon nitride ceramics is usually above 9, which makes it excellent in wear resistance and scratch resistance , enough to keep its physical and chemical properties stable at extreme high temperatures, melting point of more than 2700℃, can still maintain good mechanical strength and dimensional stability at high temperatures MATERIAL : Si3N4 DENSITY : 2.8 COLOR : Black / Blue / White HRDNESS(Mohs scale) : 9 MAX WORKING TEMPERATURE : 1650
Details
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