Abstract:The Nano-Zirconia Coating with agradated coating1Cr18Ni9 on the 20Crsteel surface is made with plasma spraying technique with the purpose of producing special pipe insulant. The microstructure of the nanostructured coating is investigated with SEM, and its wear resistance is analyzed with a friction test,the strength of combination between the coating and the base material is studied in the method of thermal shock, the heat-shielding performance of the coating is tested with a closed container with Nano-Zirco-nia Coating in contrast to one without coating. The results show that the Nano-Zirconia Coating and the gradated coating 1Cr18Ni9 are in close association with each other; the micro-hardness value of the plasma sprayed specimen is significantly improved and the wear resistance is increased by 2.84 times compared with GCr15 steel; both the heat-shielding performance and the high-temperature anti-oxidation performance of the 20Cr Steel are remarkably enhanced by the Nano-Zirconia Coating.
Key words:ZrO2;plasma spraying;microstructure of the coating
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