论文部分内容阅读
我国粉末冶金摩擦材料的生产和应用,是在六十年代中期开始的,最近几年有了很大发展。在国防和民用机械如飞机、坦克、重型汽车、船舶、拖拉机、推土机和机床上,都不同程度地采用粉末冶金摩擦材料做离合器和制动器的元件。 随着动力机械向高速、高负荷方向发展,摩擦元件的工作条件越来越繁重。例如,制动的滑动速度提高到50米/秒,工作压力增加到50公斤力/厘米~2时,摩擦表面的瞬时高温可达1000℃,这样,过去广泛使用的石棉-树脂摩擦材料,往往由于烧焦、碎裂而失效。通常使用的金属材料如耐磨铸铁、青铜等,由于高温时
The production and application of powder metallurgy friction materials in our country began in the mid-1960s, and great progress has been made in recent years. In defense and civilian machinery such as aircraft, tanks, heavy vehicles, ships, tractors, bulldozers and machine tools, are used to varying degrees, powder metallurgy friction material clutch and brake components. With the power machinery to high-speed, high-load direction, the friction element working conditions more and more heavy. For example, when the sliding speed of the brake is increased to 50 m / s and the working pressure is increased to 50 kgf / cm 2, the instantaneous high temperature of the friction surface can reach 1000 ° C. As a result, asbestos-resin friction materials, Due to scorch, fragmentation and failure. Commonly used metal materials such as wear-resistant cast iron, bronze, etc., due to high temperature