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  1. JvdWal

    What's the normal operating temperature of bearings?

    For higher temperatures you can take a full ceramic bearing. Without a cage you can go til 800C. With a cage of PEEK you can stand at least 180C
  2. JvdWal

    High coefficient of friction material

    Try SGL Carbon in Germany. The deliver the brake discs for the Porsche 911 in carbon reinforced silicon carbide
  3. JvdWal

    Preventing bearing wear

    I would suggest using a bearing, with a material combination of two much harder materials then the particles. Bearings made of Silicium Carbide Ceramic might work very well. We at Ceratec have many years of experience producing, and engineering ceramic / metal bearings, wich are most of the time...
  4. JvdWal

    Carbon Ceramic brakes

    what kind of composite material is used in the 'ceramic brakes' that porsche uses? who supplies this material?
  5. JvdWal

    joining of alumina

    Thank you for your replies, Jimmetalsceramics and metman. As said in your first point metman, I want the same material throughout for a semiconductor application. Metal may not be used in this application. What is possible For an other application where leak tightness is important, sounds the...
  6. JvdWal

    joining of alumina

    Temperature goes from 20 til 300 degrees. the joined Alumina parts have to be gas tight. The mean point is to get monolytic material.
  7. JvdWal

    Boron Carbide

    You can also try Ceratec in the Netherlands www.ceratec.nl
  8. JvdWal

    joining of alumina

    Who delivers those glass frits? I think that is the way to get a monolytic alumina, but I'm searching for information about it.
  9. JvdWal

    joining of alumina

    What kind of material do I have to use? Where can I obtain the fusing material? Alumina purities above 92% Thanks in advance
  10. JvdWal

    joining of alumina

    Actually I would like to receive the most monolytic alumina possible. Is there a way?
  11. JvdWal

    joining of alumina

    What is the right way to join alumina to alumina? Is brazing possible? Or welding? Diffusion welding? Anything else?
  12. JvdWal

    Ceramic balls

    Ceratec Technical Ceramics in the Netherlands delivers bearing grade ceramic balls. Materials they can deliver are: alumina, zirconia, silicon nitride, silicon carbide, rubin and sapphire. more info on www.ceratec.nl
  13. JvdWal

    critical speed-bearings

    I forgot, Using ceramic balls (Si3N4) makes the critical speed of an deep groove ball bearing 30% higher
  14. JvdWal

    critical speed-bearings

    critical speed [~/min] depends on outside diameter (D) of bearing D<30: n = {(3 * A) / (D + 30)}* k or, D_>30: n = {A / (D-10)} * k A (grease lubrication) A = 500000; in case of radial ball bearing A = 360000; in case of double row angular ball bearing A = 320000; in case of...

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