The effects of mixing time of powder mixture on the characteristics of sintered friction materials for aircraft brakes were
studied. The carbon content in the different place of powder mixture, the hardness and the
frictional behaviour of sintered materials were tested. The results show that, the mixing homogeneity of powder mixture is not affected obviously by mixing time, but the hardness of sintered friction materials decreases with the increase in mixing time. The hardness of sintered materials for mixing time of 16h was decreased by 10HRF compared with that for mixing time of 8h. Along with the increase of mixing time, the friction coefficient and wear of friction materials increase,but the wear of counterpart materials decreases. Through comparison of the average total wear (total wear of materials and counterpart), the average friction coefficient and the dilapidation of friction materials after 50 times brake tests, it is shown that the sintered materials for mixing time of 6～10h have fine frictional behaviour and no dilapidation with friction coefficient being 0.192～0.205 and total wear being 3.78～3.90μm at a time. The hardness of sintered materials is 62.5～66.8 HRF.