针对铜合金分火器表面长期处于高温状态下,基体表面防护涂层易发生剥落的现象,进行耐高温防护涂层的研究.使用甲基三甲基硅氧烷(MTMS)、硅溶胶为主要成膜剂,通过电导率变化研究涂料的水解程度.涂层材料喷涂在铜基体表面,经过烧结形成涂层,其耐热震性能主要与基体表面毛化程度(喷砂粒径)、涂层厚度、烧结温度和烧结时间有关.实验结果表明,铜合金表面经10～30目砂毛化处理,涂层厚度控制在20～30 μm,烧结时间在10 min,烧结温度在200℃时,获得的涂层耐热震性能最好,在500℃下的水冷热震次数达32次.
A new type of high temperature resistant coating with methyltrimethoxysilane (MTMS) and silica solution as main film former,and with appropriate pigments was applied on Cu-alloy,which is used for distributor of gas cooker or gas water heater.The results show that the resistance to thermal shock of the coating is mainly related to the surface roughness of the substrate (grit diameter),the coating thickness as well as the temperature and time of the coating sintering process;an optimal coating with high resistance to thermal shock can be obtained when the surface of copper alloy was sandblasted with 10 to 30 mesh sand,the thickness of coating is between 20～30 μm and the coating sintering is conducted at 200 ℃ for 10 min,which can withstand up to 32 cycles thermal shock between heating to 500 ℃ and water cooling.
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