混合式陶瓷球轴承在液氮中的摩擦学性能研究

研究了由ＳｉａｌｏｎＳｉ３Ｎ４陶瓷球，９Ｃｒ１８内外环以及由ＰＴＦＥ和玻璃纤维制成的保持架组合成的混合式陶瓷球轴承在液氮气氛和重负荷条件下的摩擦磨损性能，结果表明，通过９０ｍｉｎ的－１９６℃超低温台架试验后，混合式陶瓷球轴承仍可以正常工作，对试验后的陶瓷球进行显微镜观察未发现大面积的接触疲劳破坏，但在内外环滚道表面有轻微疲坑，混合式陶瓷球轴承的摩擦功耗明显低于钢制球轴承。

Tribo-characteristics of Hybrid Ceramic Ball Bearing in Liquid Nitrogen

The tribo characteristics of a high speed, self lubricating hybrid ball bearing, with Si 3N 4 ceramic balls and GCr18 steel rings were tested in liquid nitrogen atmosphere(LN 2). The bearing was tested under axial load of 2.6 kN and radial load of 2 kN at a speed up to 40 000 r/min. The hybrid bearing had a lower bearing friction torque and bearing temperature than those of the steel self mated bearing coated with TiN+Ag film. The crushing load test shows that the crushing load of Si 3N 4 ball is larger than taht of 9Cr18 ball in cryogenic atmosphere. The pitting on the steel races of hybrid bearing was found. On the contrary,no signs of pitting were observed on the race of steel self mated bearing.