| A special insulation coatings were studied, which provide a insulation layer between metal wire and metal substrate at high temperature. By analysis of the technical requirement and phenomenon of the experiments, the high temperature insulation coatings were comprised of two parts, one is primer coatings and the other is top coating. The primer coatings are high temperature resistant insulation coatings, which were treated at high temperature about 600 ℃, and the top coating is a barrier coating to prevent moisture penetration. The organic-inorganic compound process was used to produce primer coatings, using glass material as high temperature binder for film forming . The top coating is organic silicone heat resistant and water-proof coating. The mechanism of film forming and film structure were studied after heat treated at 600 ℃, the results indicated that the porosity of primer and moisture penetration are the main reasons of the insulation decrease , and after using barrier coating, the insulation property of coatings has been improved. The insulation resistance of coatings is more than 20 M 1, and the coatings could suffer cold and hot cycle test without film damage in the range of -50℃~250℃. The insulation property of the film is still excellent after heat and humidity test for 96h . |
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