多孔氧化铝陶瓷储油材料的摩擦学性能研究

Tribological Behavior of Methyl Silicone Oil-Pregnant Porous Al_2O_3

用石墨作为造孔剂,利用模压成型高温烧结方法制备了分布均匀的多孔氧化铝陶瓷,将多孔氧化铝陶瓷浸渍甲基硅油得到多孔氧化铝储油材料,在THT07 135型高温摩擦磨损试验机上考察了其同Si3N4陶瓷球对摩时的摩擦磨损性能,用扫描电子显微镜观察分析了磨损表面形貌.结果表明,浸渍甲基硅油后多孔氧化铝陶瓷的减摩抗磨性能显著改善,这是由于储存在多孔氧化铝陶瓷中的润滑剂起到润滑作用并抑制偶件的氧化磨损所致.

Porous Al_2O_3 blocks were prepared by mold compression of fully mixed graphite and Al_2O_3 powders and sintering at 1 560 ℃ for 2 h. Then the resulting sintered porous Al_2O_3 blocks were immersed in methyl silicone oil to become oil-pregnant porous Al_2O_3 materials. The friction and wear behaviors of the porous Al_2O_3 and of the oil-pregnant porous Al_2O_3 blocks sliding against Si_3N_4 were examined on a THT07-135 high temperature friction and wear tester, in a ball-on-plate contact configuration. The worn surfaces morphologies and the distribution of Si on the worn surfaces of the porous Al_2O_3 and oil-pregnant porous Al_2O_3 blocks were observed and analyzed with a scanning electron microscope. As the results, the oil-pregnant porous Al_2O_3 showed much better friction-reduction and anti-wear behavior than the porous Al_2O_3 as a control. This was because the lubricant entrapped in the porous ceramic contributed to retard the micro-fracture and to decrease the oxidation and abrasive wear of the Si_3N_4 ceramic. Though the friction and wear behavior of the oil-pregnant porous Al_2O_3 was decreased to some extent at a relatively high friction and wear test temperature, it was still by far better than that of the porous Al_2O_3 not subject to oil immersion.