| Wear-resistant pipes with ceramic inner layer were manufactured by a centrifugal-thermit process of Fe₃O₄ and Al powders and characteristics of the ceramic layer was investigated. The ceramic layer was found to be composed of Al₂O₃, FeAl₂O₄ and Fe phases. A solidification model of the reaction products was proposed, which explained cavity distribution inside the ceramic layer. As the centrifugal-force increases, separation of the reaction products, Fe and ceramic compounds, became more distinct and better bonding between the steel-pipe substrate and the reaction products was achieved. With heat-treated tool steel as a counter material, the wear of the ceramic layer was negligible within the tested sliding distance under the stress of 25g/㎟. Erosion resistance of the ceramic layer was also superior to the bare pipe. |
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