Wear performance of Ni/ZrO₂ infiltrated composite layer

Abstract

The Ni/ZrO₂ was used as raw materials to fabricate the surface infiltrated composite layer with 1–4 mm thickness on cast steel substrate through vacuum infiltrated 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°C. The results indicated that the abrasion volume of substrate was 8 times that of the infiltrated composite layer at room temperature. The friction coefficient of infiltrated composite layer decreased with the increasing load. The wear resistance of infiltrated composite layer with different ZrO₂ contents had been improved obviously under high temperature. The friction coefficient of infiltrated 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.

Keywords

Ni/ZrO₂ infiltrated composite layer / micro-structure / room temperature / high temperature / wear resistance

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