Research On Low Temperature Moulding Process Of New Type Composite Friction Material

With development of modern automotive industry and the enhancement of conscious on environment protection, the performance of the friction materials was required higher because the friction material in an automotive brake system plays a key role for effective and safe brake performance. Based on consulting and analyzing lots of internal and overseas documents about friction materials, a new technologic mathod is put forward in this paper through which friction materials are fabricated with low temperature moulding and by using new high-performance inorganic bond, steel fibre, Kevlar, iron powder, graphite, petroleum coke, barium sulfate, palm corundum. The influences of technologic parameters, such as method and time of mixing, moulding temperature, moulding pressure, time of holding pressure and method of curing-treatment process on material properties are researched. On the base of the research, the optimized technologic parameters are presented, in which the time of mixing is 35minutes, the moulding pressure is 40~50MPa, the time of holding pressure is 10～15 minutes, the method of desiccation is spontaneous desiccation at room temperature.It is indicated by the experimental results that the cool-pressed friction materials possess such properties as easy to take shape, stable friction coefficient without heat fade, good performance of heat recovery, satisfied shock-strength which can come up to the national standard. Compared with hot-presses friction materials, cool-pressed friction materials possess low hardness, good performance of smooth braking, low noise.Wide materials origin, easy moulding technics, high cost performance, low energy consumption and low environmental pollution bring wider foreground to application of the technics.