Effects of AlN-CrFe Mixed Components on Properties of Cu-based Powder Metallurgy Friction Materials
Taking AlN-CrFe as mixed friction component,Cu-based friction materials were prepared by powder met-allurgy method,and effects of AlN-CrFe content on properties of Cu-based friction materials were investigated.The results indicate that with the gradual increase in AlN content,the hardness is gradually increased,while the density shows a gradual decline trend.When AlN content exceeds 9%,the variation of hardness and density of material is indistinctive.Both the friction coefficient and relative wear amount are gradually reduced with the increase of AlN con-tent.A high and stable friction coefficient can be obtained with the AlN/CrFe proportion of 3∶9.During the friction and wear test,there exist spalling pits and cracks on the surface of material,which become smaller with the AlN content increasing.The wear mechanism is gradually transformed from peeling wear to oxidizing wear,and finally to abrasive wear.
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