Thermotics Study of the Semimetallic Nylon1010 Composite

Thermal expansion characteristics of semimetal nylon composites (nylon 1010 incorporated with metal oxides) were analyzed with thermal expansion instrument. The changes of composite weight after being heated and the heat absorption and release of the composites were analyzed by carrying out TG-DSC experiments. Experimental results show that the average thermal expansion coefficient of the composites rises as the average diameter of the metal oxides decrease from room temperature to 160 ℃. Thermal dynamics and physical properties of the nylon composites change with the addition of the oxides; the crystallization temperature rises from 180 ℃ of pure nylon to 190 ℃ (maximum) and the melting point of the oxide composites also increases continuously with the addition of the oxides. The water content of the oxide/nylon composite is related to the kind and content of the oxide. The water content reaches its maximum when the content of oxide is 10%, and the 10% Al2O3/nylon composite has a water absorption ratio up to 1%.

半金属尼龙1010复合材料摩擦热效应试验研究

利用自制可变速摩擦热试验机对复合材料的表面温度场、摩擦系数和摩擦磨损状况进行了测试,并通过扫描电子显微镜对复合材料的表面微观形貌以及转移膜的成分进行了分析。实验结果表明:不同组分、含量的金属氧化物/PA1010复合材料的表面温升并不相同;Fe_3O_4/PA1010复合材料摩擦片摩擦因数与表面形成的转移膜有关;制动时复合材料摩擦片表面瞬时温度经历三个阶段:无反应阶段、线性升温阶段、温度缓慢变化阶段;摩擦因数的变化趋势和复合材料的玻璃态向高弹态转变的过程相对应。