Ceramic Bearings from ST
are available in virtually every common material and standard size
also as hybrid bearings
or axial bearings
or angular contact bearings
available for as little as under €20!

Ceramic Bearings

Ball bearings are available either as hybrid bearings (steel rings and ceramic ball elements) or as full-ceramic bearings. Hybrid bearings easily substitute metal bearings, however, they do not show all the material advantages listed above. This is why full-ceramic bearings with rings and rolling elements (balls, cylinders, cones) are preferred for many applications.

Comparison between ceramic and metal bearings

Ceramic bearings boast a number of advantages over metal bearings:

  • Extremely smooth running characteristics as result of very low friction
  • Low-maintenance or zero-maintenance (media-lubrication or zero lubrication both possible)
  • Excellent wear resistance and thus long service life
  • Reduced weight (up to 60% less)
  • Excellent chemical resistance (especially corrosion resistance & resistance to humidity)
  • High hardness
  • High stiffness
  • Non-magnetic
  • Excellent temperature stability (up to 1,000°C)

These properties open up a host of application possibilities in the following areas:

  • Aerospace engineering
  • Machinery and equipment
  • Turbo pumps
  • Chemicals industry (aggressive media)
  • Metalwork industry (high operating temperatures)
  • Pharmaceuticals industry
  • Medical technology
  • Food industry
  • Semiconductor industry and biotechnology (e.g. clean room conditions do not allow for any contamination by lubricants)

Ball bearings are available either as hybrid bearings (steel rings and ceramic ball elements) or as full-ceramic bearings. Hybrid bearings easily substitute metal bearings, however, they do not show all the material advantages listed above. This is why full-ceramic bearings with rings and rolling elements (balls, cylinders, cones) are preferred for many applications. The main ceramic material used for our bearings is non-oxide ceramics (Si3N4). For specifics on the advantages of the different materials, see the data sheets.

Materials Properties Si3N4 ZrO2 SiC 100Cr6
Density ρ g/cm³ 3,2 >6,0 3,14 – 3,2 7,85
Hardness HV10 N/mm² 1600 1300 – 1500 2400 700
Young’s Modulus E GPa 300 205 410 210
Thermal Expansion Coefficient α 10-6/K 3,2 >10 4,3 11,5
Flexural Strength δB N/mm² 750 1000 – 1500 300 – 600 >2500
Fracture Toughness KIC MPa m½ 8 8 – 12 4 – 5 >20
Thermal Conductivity λ W/m * K 22 2 30-120 40 – 45

Bearings are available in ISO-compliant measurements, in the precision classes P0, P6, P5 and P4; bearings can of course also be custom made to your individual specifications.

CONTACT US

We are pleased to answer your questions and help find a solution to your problems with new and innovative materials. Do you have a question you would like to ask, or perhaps your own materials do not meet the specific demands of a given application? Then send us an e-mail.

E-Mail: verwaltung@sintertechnik.com

ADDRESS

Sintertechnik GmbH
Altreuthstr. 18
D-91362 Pretzfeld

Telephone: +49 9194 9550

Fax: +49 9194 4251

OFFICE HOURS

Monday – Friday: 8AM – 6PM