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发动机技术的当前趋势是提高发动机的额定功率,降低燃料消耗,以及使其能使用低价格燃料。为了提高燃油效率,降低冷却要求以及减小摩擦,在柴油机上对用作基体材料以及涂层的陶瓷均进行了研究。正在研制的等离子喷涂热障陶瓷涂层是建立在航空发动机工业部门所积累的多年的运用经验的基础之上的。现在,在用于柴油机上的等离子喷涂试生产涂层方面也正在取得经验。本文继介绍等离子喷涂过程之后,将讨论有关在大量生产基础上制作喷涂层的一些问题。重点放在喷涂前的表面准备、粉末类型以及质量控制、等离子喷涂过程的条件、发动机零件大量生产所需的机器的原理以及喷涂屡质量控制观点。
The current trend in engine technology is to increase the engine’s rated power, reduce fuel consumption, and make it possible to use low-cost fuel. In order to improve fuel efficiency, reduce cooling requirements and reduce friction, both the ceramic used as a base material and a coating were investigated on a diesel engine. The plasma sprayed thermal barrier ceramic coating being developed is based on years of experience accumulated in the aviation engine industry. At present, experience is also being gained in the pilot production of coatings for plasma spraying on diesel engines. Following the introduction of the plasma spray process, some of the issues related to the production of sprayed coatings on a mass production basis are discussed. The emphasis is on surface preparation, powder type and quality control before spraying, conditions of plasma spraying process, the principle of machines required for mass production of engine parts and the quality control point of view of spraying.