Overview
| brand | Wumeng Ceramics | specifications | Customized according to needs |
| model | 03-020 | Processing customization | yes |
| Processing capacity | High quality processing | Saleable land | nationwide |
| material quality | Silicon nitride | Forming process | Hot pressing |
| purpose | mechanical | performance | Wear-resistant, pressure-resistant, high-temperature, corrosion-resistant insulation |
| colour | black | quantity | one thousand |
| Batch number | twenty million two hundred and twenty thousand four hundred and twenty-seven | encapsulation | Carton+foam |
| Sample cycle | 3 days | ||
Product Details
Silicon nitride ceramics
Silicon nitride ceramic material has high hardness, low density, wear resistance, and high temperature resistance. The rolling element is made of silicon nitride ceramic, and other components are still paired with bearing steel to form a friction pair. The friction coefficient is extremely low, and it is not easy to adhere and bond with the cage. Therefore, it has always been considered a material for manufacturing high-speed and precision bearings.
The use of ceramic rolling elements in bearings was initially intended to meet the demanding operating conditions of advanced gas turbines. Later, various applications in other fields such as machine tool spindles, electric motors, and generators accelerated the development of ceramic rolling elements.
Hybrid rolling bearings with ceramic rolling elements are used in many challenging applications. The railway and renewable energy industries (such as wind turbines) have already started using them in large quantities.
Characteristics of silicon nitride ceramic rollers:
Silicon nitride ceramic balls have a series of properties that metal materials do not possess, such as high ceramic strength, good wear resistance, high stiffness, corrosion resistance, high temperature resistance, electrical insulation, non magnetic conductivity, and small specific gravity. They have become the first material for ceramic bearings.
Performance of silicon nitride ceramics:
High rigidity, high strength, and high hardness.
Extremely strong corrosion resistance, suitable for use in strong acids and alkalis.
High temperature resistance, silicon nitride ceramic balls can be used normally in environments below 1000 ℃.
Non magnetic, electrically insulated.
Low density (3.24g/cm3), about 60% lighter than steel balls, reducing wear and noise.
Low linear expansion coefficient (3.2 × 10-6/K), almost 1/4 of the bearing steel, can withstand sharp temperature changes.
Self lubrication can solve the pollution and inconvenience caused by lubricating media, and can be used under vacuum and high temperature.
Drug resistance, high mechanical strength, and low thermal conductivity.
Fracture toughness: 7.0MPa · m1/2
Bending strength: 800MPa
Compressive strength: 1800MPa
Elastic modulus: 320GPa
Thermal conductivity: 80W/m · k
Hardness 9~9.5
The specific heat capacity is 0.71J/(g · K).
The heat of formation is -751.57kJ/mol.
The thermal conductivity is 16.7W
Application fields of silicon nitride ceramics:
Motor bearings, high-temperature spindles, turbine blades, mechanical seals
Welding roller, water blocking ring, crucible, combustion nozzle
Corrosion resistant and wear-resistant parts such as ball valves, pump bodies, burners, carburetors, etc
High temperature insulation, radar radome, engine
Metal forming, rolling elements, cutting tools, industrial nozzles
Turbine rotor, cam tappet, powder treatment pump, valve, sealing ring
Sealing pumps, sealing valves, heat-resistant parts of automotive internal combustion engines, aircraft turbine engines
Ceramic blades, turbine outer rings, and air bearings