| 摘要 |
PURPOSE:To obtain a heat insulating cylinder liner having good quality at a low cost by spraying thermally specifically composed ceramic powders of partially stabilized ZrO2.Y2O3 and Cr2O3 onto the sliding surface of the cylinder liner at the continuously varied mixing ratios. CONSTITUTION:The thermally spraying powder materials of 2 kinds of ceramics; the partially stabilized ZrO2.Y2O3 consisting of 4-20% Y2O3 and 80-96% ZrO2 contg. a slight amt. of oxide and Cr2O3 are thermally sprayed onto the sliding surface 2 of the cylinder liner 1 made of a metal while the mixing ratio thereof is continuously or stepwise changed to form the ceramic coating layer 3 on the sliding surface, by which the cylinder liner having an excellent heat insulating characteristic, wear resistance and scuffing resistance is obtd. The above-mentioned ceramic coating layer 3 is formed by spraying thermally the powder materials onto the thermally sprayed underlying coating layer of the nichrome alloy formed on the surface of the cylinder liner 2 by starting first from 100% ZrO2.Y2O3, then decreasing successively the same and increasing the ratio of Cr2O3 until finally the Cr2O3 is sprayed at 100%.
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