偶联修饰纳米蒙脱土/超高分子量聚乙烯基复合材料的摩擦磨损性能  

FRICTION WEAR BEHAVIOR OF COUPLING MODIFIED NANO-MONTMORILLONITE/ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE COMPOSITES

作　　者：温建萍[1] 甄明辉[1] 沈洲[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《硅酸盐学报》2007年第8期1040-1045,共6页Journal of The Chinese Ceramic Society

基　　金：航空科学基金(04G52044)资助项目

摘　　要：通过模压烧结法制备了超高分子量聚乙烯(ultra-high molecular weight polyethylene,UHMWPE)与硅烷(silane,s)和钛酸酯(titanate,t)偶联剂修饰的纳米蒙脱土(nano-montmorillonite,nano-MMT)复合材料,nano-MMT含量由0到15%(质量分数,下同)。采用45#钢为摩擦对偶件的往复滑动式摩擦磨损试验机,在室温干摩擦条件下测试了复合材料的摩擦学性能,实验条件为:接触压力P=8.0kN、滑动速度v=1.8m/min、时间t=3h;用扫描电镜观察了复合材料磨损表面的形貌并分析了磨损机理。结果表明:随nano-MMT含量的增加,偶联修饰的nano-MMT/UHMWPE复合材料的硬度、摩擦系数和磨损率增加;偶联修饰改善了复合材料的摩擦学性能;与钛酸酯相比,硅烷偶联修饰nano-MMT/UHMWPE复合材料的硬度和摩擦学性能更好。用5%硅烷偶联修饰的nano-MMT,5%钛酸酯偶联剂修饰的nano-MMT和5%nano-MMT增强的UHMMPE复合材料的摩擦系数μ、摩擦温度θ、磨损率W分别为:μs=0.124,μt=0.135,μ=0.180;θs=92℃,θt=96℃,θ=94℃;Ws=4.25×10-7mm3/(N.m),Wt=6.31×10-7mm3/(N.m),W=18.80×10-7mm3/(N.m);两种偶联修饰复合材料的表面磨损情况相似,含5%nano-MMT的复合材料主要表现为粘着磨损,而含15%nano-MMT的复合材料主要表现为表层和亚表层的脆性疲劳断裂。The ultra-high molecular weight polyethylene （UHMWPE） / nano-montmorillonite （MMT） composites modified with silane and titanate coupling agent were made by the compression mould/sintering technique. Composites from 0 to 15% （in mass, the same below） were prepared. The friction and wear properties of the composites were tested against a 45 carbon steel counterfact on a reciprocating tribometer at room temperature and under dry friction conditions. The experimental conditions were a contact pressure of 8 kN, a sliding velocity of 1.8 m/min, and a sliding time of 3 h. The worn surface of the composites was examined by scanning electron microscopy, as an attempt to examine the wear mechanism of the composites. The results show that the hardness, friction coefficient and wear rate of nano-MMT reinforced UHMWPE composites modified with silane and titanate coupling agent increase with the increase of content of nano-MMT. The tribological properties of UHMWPE composites modified with silane and titanate coupling agent were improved. The composite modified with silane coupling agent has higher hardness and better tribological properties than the composite modified with titanate coupling agent. The friction coefficient μ, friction temperature 0 and wear rate Wof the UHMMPE composites of 5% nano-silane coupling agent modified MMT, 5% nano-titanate coupling agent modified MMT and 5% nano-MMT are respectively μs=0.124,μt=0.135,μ=0.180; θs=92 ℃, θt=96 ℃, θ=94 ℃; Ws=4.25^-7mm^3/（N·m）, Wt=6.31^-7mm^3/（N·m）, W= 18.80^-7mm^3/（N·m）. The surface wear of the two kinds of composites modified with silane and titanate coupling agent are similar. The wear mechanism of the composite of 5% nano-MMT exhibits mainly adhesion, but the composite of 15% nano-MMT is translated to brittle breakage of the wear surface.

关 键 词：硅烷偶联剂 钛酸酯偶联剂 超高分子量聚乙烯 摩擦磨损 复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程]