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近几年,世界各国都在致力于提高列车速度。日本也在对新干线实行高速化攻关。另一方面,由于高速化的要求,制动闸片的形状不断小型轻量化,而且,制动吸收的能量非常大,故热负荷急剧增大。在这种严酷的工作条件下,以往的材料已无法适应使用要求。现已成功地开发了能足以经受这种条件的烧结摩擦材料(化学成分如下表),其特点如下: (1)高速制动时,由于工作表面处于高温,故以铜、铁、镍合金为基材,大大提高了其耐热温度; (2)陶瓷添加量由过去的3％～5％增大
In recent years, all countries in the world are devoting themselves to increasing the speed of trains. Japan is also speeding up the Shinkansen. On the other hand, due to the demand for speeding up, the shapes of the brake pads are continuously reduced in size and weight, and the energy absorbed by the brake is extremely high, so that the thermal load increases sharply. In this harsh working conditions, the past material has been unable to meet the requirements. Has been successfully developed to be able to withstand such conditions sintering friction material (chemical composition in the table below), which are as follows: (1) high-speed braking, the work surface at high temperatures, so the copper, iron, nickel alloy as Substrate, greatly improving the heat-resistant temperature; (2) the amount of ceramic added from the past 3% to 5% increase