The tribological performances between Si3 N4 ceramic balls and GCr15 steel disks without lubrication both in air and in vacuum (6 × 10-3pa) are investigated. The results show that the friction coefficient and wear in vacuum are smaller than those in air. The friction mainly occurs between steel and steel in air because the steel is obvious to adhere on the ceramic surface. The ceramic and steel are hard to adhere in vacuum. The function of mechanical plough and the rotation of small wear particles in the contact region reduce the friction and wear between the ceramic and steel in vacuum.
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