【摘要】 为了制得一种新的超微/纳米复合胶体,基于纳米六方氮化硼对硅油的润滑性改善作用机制以及六方氮化硼(h-BN)和石墨(C)的相似性质,通过将h-BN和C混合后高能球磨,然后真空烧结,最后与硅油混合后重新进行球磨细化,制备出BN-C-硅油复合胶体。探讨了该胶体的结构形态、润滑机制以及摩擦盘表面粗糙度对其润滑性能的影响。研究表明:该胶体在较宽温度范围内具有良好的润滑性,无论在常温还是高温下,该胶体的摩擦因数显著低于BN-硅油胶体和纯硅油;BN-C-硅油胶体的润滑性能受摩擦副粗糙度的影响,粗糙度值越小,胶体的摩擦因数越小。结合汗腺式金属陶瓷烧结体(干摩擦因数为0.25)的结构特点,研究了该复合胶体的应用,结果表明浸渍该胶体后可得到200℃下干摩擦因数为0.13的高温自润滑金属陶瓷。更多还原

【Abstract】 Based on the similar properties of hexagonal boron nitride(h-BN)to graphite(C)and the improving mechanism of nano h-BN to the lubricating property of silicone oil,h-BN and C powders were mixed and milled in a high energy ball mill,then sintered in vacuum,and finally milled again with silicone oil to prepare a new ultra-micro/nano composite colloid.The structure and the lubricating mechanism of the colloid,the effect of the plate surface roughness on the lubricity of the colloid were discussed.The results show that the BN-C-silicone oil colloid performs good lubricating property at a wide range of temperature.The frictional coefficient of BN-C-silicone oil colloid is evidently lower than those of BN-silicone oil colloid and pure silicone oil at both ambient temperature and high temperature.The frictional coefficient of the colloid goes lower as the plate surface roughness decreases.Considering the structure characteristic of the sweat-gland ceramic sinter,the application of the colloid was studied.It is found that when the colloid was dipped into the ceramic sinter,the dry frictional coefficient of the sinter decreased from 0.25 to 0.13 at 200 ℃.The ceramic sinter turned to self-lubricating ceramic sinter at high temperature.更多还原