铸型尼龙及其复合材料的摩擦学性能和晶型转变

THE TRIBOLOGICAL PROPERTIES AND TRANSITION OF CRYSTAL FORM OF MONOMER CAST NYLON AND ITS COMPOSITES

利用 MM- 2 0 0摩擦磨损试验机研究了在干摩擦和水润滑条件下铸型尼龙 (MC尼龙 )及其复合材料的摩擦磨损性能 ,并利用红外光谱分析了材料在不同磨损条件下发生的物理化学变化。研究结果表明 ,在干摩擦条件下 ,当载荷与速度的积 (pv值 )小于 84 N.m/s时玻璃纤维增强 MC尼龙复合材料(GF/MC)的摩擦系数和磨损率都比 MC尼龙低 ;当 pv值大于 84 N.m/s时 ,GF/MC的摩擦系数略高于MC尼龙 ,而磨损率则远大于 MC尼龙 ,随 pv值的改变 ,磨损机理发生了变化。在水润滑条件下二者的摩擦系数降低 ,GF/MC的耐磨性比纯基体显著提高。光谱分析表明 ,MC尼龙及其复合材料在摩擦过程中会发生晶型转变 ,在干摩擦后 α晶型减少 ,γ晶型增多 ,在水润滑后 α晶型增多 ,而

The tribological properties of monomer cast nylon(MC nylon) and its composites under dry friction and water lubrication were investigated on a MM 200 model friction and wear testing machine, and the physical and chemical transformations of materials with different wear conditions were analyzed using infrared spectroscopic analysis. The results show that, under dry friction, the friction coefficient and wear rate of glass fiber reinforced MC nylon composite is lower than that of MC nylon when the load( p ) multiplied by sliding velocity( v ) ( pv value) is less than 84 N·m/s; when the pv value is over 84 N·m/s, the friction coefficient of composite is little higher than that of MC nylon, but the wear rate is remarkably higher than that of MC nylon. The wear mechanism of materials is changing with variety of the pv value. Under water lubrication, the friction coefficients of both these materials reduce, and the wear resistance of the composite is remarkably higher than that of pure MC nylon. The spectroscopic analysis shows that the transition of crystal form of MC nylon and its composite is happened on the friction. The quantity of α crystal form is fewer than that of γ crystal form under dry friction, while more than that of γ crystal form under water lubrication.