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用模拟刹车制动的摩擦试验机 ,研究了 1种针刺毡结构炭 /炭复合材料在不同制动速度下的摩擦磨损性能 ,并在光学显微镜下直接对摩擦表面进行了观察和分析 .研究结果表明 :在制动速度为 5m/s或静态条件下 ,针刺毡炭 /炭复合材料的摩擦因数很低 ,但在制动速度为 10m/s、能量较小时摩擦因数出现了峰值 ;在制动速度升高到 2 0m/s后 ,摩擦因数较高且随刹车速度变化趋于稳定 ,显示出优良的高能高温制动性能 ;只要制动速度不是极高 (如2 8m/s) ,这种材料均具有很好的抗磨损性能 ,其中磨损量在制动速度为 15m/s时达到最大值 ,该制动速度对应于飞机进出场滑行制动速度 ;摩擦表面微观结构及氧化状况取决于制动条件的影响 ,炭磨屑和基体炭在制动过程中会优先氧化 .
The friction and wear properties of a kind of needle felt structure carbon / carbon composite under different braking speeds were studied with a friction tester simulating brake braking, and the friction surface was observed and analyzed directly under a light microscope. The results show that the friction coefficient of needle felt carbon / carbon composites is very low at the braking speed of 5m / s or static condition, but the friction coefficient appears peak value when the braking energy is 10k / After the braking speed is increased to 20m / s, the friction coefficient is high and changes with the braking speed tends to be stable, showing excellent high temperature and high temperature braking performance; as long as the braking speed is not very high (such as 28m / s) This material has a good anti-wear properties, of which the amount of wear at a braking speed of 15m / s maximum, the braking speed corresponding to the aircraft entering and leaving the taxiway braking speed; friction surface microstructure and oxidation dependent Under the influence of braking conditions, carbon wear debris and carbon matrix will be preferentially oxidized during braking.