Bearing Balls and Other Machinery Parts

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Silicon Nitride Ceramic Bearing Balls

Toshiba Materials' silicon nitride ceramic bearing balls are stronger, harder and more wear-resistant than steel ones, lengthening the life of machinery.
They are also lightweight with less than half the density of steel balls, helping to conserve energy.
Silicon nitride ceramic material is an insulator that will not corrode or rust, enabling it to be used in extreme conditions.

Features

  • High strength, hardness and heat resistance
  • Low density (less than half the weight of a steel ball of the same size)
  • Resistant to electrolytic corrosion, chemical corrosion and rust
Silicon Nitride Ceramic Bearing Balls

Product specifications

Product specifications : Silicon Nitride Ceramic Bearing Balls
Item Unit Silicon nitride High-carbon chromium Features of Ceramic Bearings
Heat resistance 800 180 Maintain strong load bearing performance in high temperatures
Density Mg/m2 3.24 7.8 Reduce centrifugal force of rolling elements (bearing balls and rollers), lengthening life and preventing increase in temperature
Thermal expansion coefficient x10-6K 3 12.5 Minimal change in internal gaps under high temperatures, preventing vibration and minimizing changes in preload
Hardness HV 1500 750 Minimal deformation of rolling contact parts, increasing hardness
Young's modulus GPa 308 208
Poisson's ratio 0.29 0.3
Corrosion resistance Good Poor Can be used under unusual conditions such as in acid and alkali solutions
Magnetism Non-magnetic Ferro-magnetic Minimal rotation change caused by magnetism in strong magnetic fields
Thermal conductivity Insulator Conductor Prevents electric pitting (in generators, motors, etc.)
Molecular bonding state of materials Covalent bonding Metallic bonding Minimal agglutination caused by absence of oil film
Material Grade Features and properties Example uses

Applications

  • Bearings for wind power generators
    Generator
  • Machine tools
  • In-vehicle motors
  • Aircraft engines
  • Medical drills and other medical equipment

In-vehicle Parts and Industrial Machinery Parts

Silicon nitride ceramics have a lighter weight and a greater resistance to wear and corrosion than conventional metal parts. They are used for in-vehicle parts and parts in various industrial machinery parts such as semiconductor manufacturing equipment.
In-vehicle parts to which silicon nitride ceramics are suited include diesel pump rollers which require resistance to wear and baking, and the check ball for fuel injection in diesel engines, which needs to be hard and resistant to wear.
The industrial equipment field, meanwhile, makes use of the material's wear resistance, heat resistance and outstanding heat shock performance that prevents it from being wet by molten metal, using it in various tools for semiconductor manufacturing equipment, including center valves, contact collets and masks.

In-vehicle Parts and Industrial Machinery Parts

Features

  • Wear resistant
  • Resistant to baking

Product specifications

Product specifications : In-vehicle Parts and Industrial Machinery Parts
Item Unit Silicon nitride High-carbon chromium Features of Ceramic Bearings
Heat resistance 800 180 Maintain strong load bearing performance in high temperatures
Density Mg/m2 3.24 7.8 Reduce centrifugal force of rolling elements (bearing balls and rollers), lengthening life and preventing increase in temperature
Thermal expansion coefficient x10-6K 3 12.5 Minimal change in internal gaps under high temperatures, preventing vibration and minimizing changes in preload
Hardness HV 1500 750 Minimal deformation of rolling contact parts, increasing hardness
Young's modulus GPa 308 208
Poisson's ratio 0.29 0.3
Corrosion resistance Good Poor Can be used under unusual conditions such as in acid and alkali solutions
Magnetism Non-magnetic Ferro-magnetic Minimal rotation change caused by magnetism in strong magnetic fields
Thermal conductivity Insulator Conductor Prevents electric pitting (in generators, motors, etc.)
Molecular bonding state of materials Covalent bonding Metallic bonding Minimal agglutination caused by absence of oil film
Material Grade Features and properties Example uses

Catalog download

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Open 9:00am-5:00pm (business days)

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