Wear Performance of Ni/ZrO 2 Infi ltrated Composite Layer

The Ni/ZrO 2 was used as raw materials to fabricate the surface infi ltrated composite layer with 1-4 mm thickness on cast steel substrate through vacuum infi ltrated casting technology. The microstructure indicated that the infiltrated composite layer included surface composite layer and transition layer. Wear property was investigated under room temperature and 450 ℃. The results indicated that the abrasion volume of substrate was 8 times that of the infi ltrated composite layer at room temperature. The friction coeffi cient of infi ltrated composite layer decreased with the increasing load. The wear resistance of infi ltrated composite layer with different ZrO 2 contents had been improved obviously under high temperature. The friction coeffi cient of infi ltrated composite layer was decreased comparing with that at room temperature. The oxidation, abrasive and fatigue abrasion was the main wear mechanism at room temperature. Oxidation abrasion, fatigue wear and adhesive wear dominated the wearing process under elevated temperature.