Research on Friction and Wear Performance of Brake disc Pair Materials for New Type of Drilling Rig

摘要

Tribological performance of new brake pair is studied at different temperatures, load and speed by variable temperature friction and wear test. The research indicates that brake pair has better frictional characteristics at variable temperature as well as heat-fade resistance performance at high temperatures. Wear rate of brake block and brake disc increases with friction temperature rising, however wear-resisting performance of brake disc is comparatively stable. Load has less influence on frictional coefficient of brake pair. Wear rate of brake disc and brake block increases with load increasing, but brake block has comparatively stable wear-resisting performance. Frictional coefficient of brake pair increases and tends to stabilize gradually along with sliding speed increasing, and speed has less influence on wear rate of brake block and brake disc. Initial heat-fading occurs in brake block material along with frictional temperature rising, secondary solidification may happen when frictional temperature reaches a certain value. When temperature rises much higher, brake block begins to soften and plastic flow intensifies, in addition thermal decomposition occurs in organic substance and wear-resisting performance becomes poorer. Build-up welding material has strong age-hardening effect and stable thermal structure, which leaves surface hardness and structure performance of brake disc unchanged at high temperatures.