• f
  • t
  • g
  • y
  • in
Technical Ceramics

LOADING IMAGES

Si3N4 Silicon Nitride Ceramic Bearing Balls

The unique combination of material properties of Silicon Nitride makes it ideal for applications with high dynamic stresses, thermal rigor, and demanding reliability requirements, meanwhile, it provides advantages in severe-service applications such as turbines and high-end ball bearings.
  • Density :

    3.3 g/cm3
  • Max. Service Temp. :

    1200 degree C
  • Thermal Conductivity :

    27 W/m.K
  • Dielectric Strength :

    20 KV/mm
Inquiry now
Product Detail



Material Introduction


Silicon nitride ceramic balls are precision ceramics sintered at high temperature in a non-oxidizing atmosphere. It has high strength, high wear resistance, high temperature resistance, corrosion resistance, acid and alkali resistance, and can be used for a long time in seawaterand has good performance of electrical and magnetic insulation. At 800, the strength and hardness are almost unchanged. Its density is 3.20g/cm3, which is almost 1/3 of the weight of steel bearing. The centrifugal force is small during rotation. High-speed operation can be achieved. It also has self-lubricating properties, and it can be used in environments where no lubricating medium is highly polluted. Become the first choice for ceramic bearings and hybrid ceramic ball bearings.


The superiority of silicon nitride bearing material:


- 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.


- 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.


- 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.


- 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.


- 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.


- 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.


Compared with steel bearings, the main advantages of silicon nitride bearings are:

1. It is 59% lighter than steel bearings, which greatly reduces the centrifugal force, rolling and wear of the bearing on the raceway during high-speed and accelerated operation;

2. The modulus of elasticity is 44% larger than that of steel, which means that the amount of deformation is much smaller than that of steel balls when subjected to force;

3. The hardness is higher than steel, HRC reaches 78;

4. Small friction coefficient;

5. The thermal expansion coefficient is 1/4 of that of steel, which can withstand drastic changes in temperature;

6. It is easy to obtain almost perfect surface finish, Ra can reach 46nm;

7. High temperature resistance: Silicon nitride ceramic balls still have high strength and hardness at 1050°C;

8. Never rust, and can work without oil lubrication;

9. More resistant to chemical corrosion than steel;

10. No metal pollution;

11. Non-magnetic;

12. Electrical insulation.

13. There is no adhesion and wear;

The combination of these excellent properties makes silicon nitride the first choice for high-performance bearing rolling element materials.


Technical Properties of Si3N4 Silicon Nitride Ceramic


Request a free quote

If you have questions or suggestions, please leave us a message,we will reply you as soon as we can!

Hot Products
  • boron nitride nozzle

    Boron Nitride Ceramic Nozzle For Metal Powder Gas Atomization

    BN-2300, one of hexagonal boron nitride based composite, is an ideal materials for an atomizer nozzle, thanks to its high strength, high melting point, high toughness, outstanding thermal shock resistance, excellent machinability and low-friction properties. BN-2300 nozzles for the atomizing process can ensure a continuous flow with no blockage or breakage happening at that level.

  • Ceramic Grinding Media

    Ceramic Grinding Media Balls Beads

    Ceramic grinding balls have been extensively used in high-speed milling applications for blending, grinding, and dispersing. Additionally, ceramic balls and beads are used as abrasive media for ceramic raw materials and glazes in ceramic factories, cement factories, enamel factories, and glass work due to their superior density, stiffness, and wear efficiency.

  • Alumina Ceramics

    Alumina Ceramic Parts

    Alumina parts are made of aluminum oxide, which is one of the most important and versatile materials in the field of oxide ceramics. This material therefore used in a wide range of applications. The alumina ceramic from UNIPRETEC has a Al2O3 purity up to 99.8%. Due to the fine structure of the material and its high surface quality, an unsurpassable combination of properties can be achieved.

  • Ceramic Welding Roll

    Ceramic Si3N4 Welding Rolls for Steel Tube Industry

    silicon nitride ceramics is an inorganic non-metallic material. It is a super-hard material, which has lubricity and is wear-resistant; except for hydrofluoric acid, it does not react with other inorganic acids. It is highly corrosive and resistant to oxidation at high temperatures. Moreover, it can resist high thermal shocks. It will not crack when heated to over 1,000°C in the air, cooled rapidly and then heated rapidly. Because of the excellent characteristics of Si3N4 ceramics, it’s often used to manufacture bearings, turbine blades, mechanical seal rings, permanent molds and other mechanical components. In the field of welding of copper stainless, and aluminum tubes, silicon nitride ceramic rolls have natural advantages.

  • boron nitride setters

    Ceramic Boron Nitride Setters for Nitride Ceramics Sintering

    Boron Nitride can be compared to graphite thanks to lubrication capacities, good thermal conduction and easy machinability, although it's white and has good electrical insulation. Plus, it isn't wetted by most molten metals and can therefore be used as a container for most molten metals.

  • Alumina ceramic sintering aid for MIM

    High Purity Alumina Ceramic Sintering Aid for MIM Components

    Ceramic kiln furniture has two basic properties - firstly dimensional stability at high temperatures and secondly thermal shock resistance. UNIPRETEC is professional manufacturer of High Purity Alumina Ceramic Kiln Furniture(Trays, Setter Plates, Saggers).

Related products
Ceramic Welding Guide Roll
Si3N4 Silicon Nitride Ceramic Guide Roll For HF Tube And Pipe Welding
UNIPRETEC is good at producing standard and customized Si3N4 Silicon Nitride Guide Roll for high frequency electric resistance welding. Typical Si3N4 properties are: high thermal shock resistance, high service temperature, excellent electrical insulated, high wear and corrosion resistance. Si3N4 weld guide rolls improve the surface finish of the tube and reduce scrap rates, by using Ceramic Guide Rolls, customers benefit from reduced down time, better process efficiency and higher yields.
SILICON NITRIDE SLIDING SHOES
Si3N4 Silicon Nitride Ceramic Sliding Shoes Blocks for Induction Hardening Machines
Silicon Nitride Ceramic exists high hardness, high mechanical strength and wear resistance at high temperature, so Silicon Nitride is an ideal material for sliding shoes and blocks in induction hardening system.
Ceramic Weld Pins
Ceramic Welding Guide Pins
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.
Paper Dewatering Foils
Si3N4 Silicon Nitride Ceramic Paper Dewatering Foils
Silicon Nitride Ceramic is hard and chemical inert, which makes Si3N4 a perfect wear and corrosion material. Besides, Silicon Nitride has very high thermal shock resistance. So Silicon Nitride is typically used to make Paper Dewatering Foils.
Silicon Nitride Ceramic Hook
Si3N4 Silicon Nitride Ceramic Hook for Hot Dip Aluminising
In the molten metal handling industry, hot-dip aluminising is a process for improving the metals' corrosion and wear resistant properties, Ceramic Hooks made of Silicon Nitride is used in this process.
silicon nitride parts
GPSN Si3N4 Silicon Nitride Ceramic Parts
Silicon Nitrides (Si3N4) feature an excellent combination of material properties. They are nearly as light as silicon carbide (SiC), but their microstructure gives them excellent thermal shock resistance and their high fracture toughness makes them resistant to impacts and shocks.
silicon nitride bushing
GPSN Si3N4 Bush Silicon Nitride Ceramic Bushing
Silicon Nitride Ceramic exists high hardness, high mechanical strength and wear resistance at high temperature.
silicon nitride rod
GPSN Si3N4 Silicon Nitride Ceramic Rods
Silicon Nitride ceramic's unique properties of high strength, superior fracture toughness and excellent hardness provides a unique engineering material solution for many project's extreme environments and demanding mechanical / structural requirements.
our Partners
Customer CTS
Customer ERAMET
Partner Magna
Customer INDO-MIM
Partner Knowles Electronics
MARTOR
PARTNER FUZHOU UNIVERSITY
Customer HealthCap
PARTNER TSINGHUA UNIVERSITY
chat now
If you have questions or suggestions, please leave us a message,we will reply you as soon as we can!
   

Online Service