セラミックス製ボールねじの試作 (第1報)

アルミナ製円筒状モデルによる寿命試験

抄録

In order to study the applicability of ceramics to ball screws, the life test was performed by the combination of simplified cylindrical models of alumina test pieces and some kinds of ceramic balls. Basic dynamic capacity of alumina obtained from their results was only 3.4% of that of bearing steel. SEM observation made it clear that the fracture occurred from the outskirts of the ceramics pores. Furthermore, in order to improve their surfaces, ceramics of Si₃N₄ or TiC was coated on the cylindrical surfaces of test pieces by CVD, but it was not so effective.