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1.前言据L、R、S的《发动机燃油箱分析报告》声称,目前发动机使用的燃油含硫4.0％,含钒437ppm。使用这种油时,高温部位产生高温腐蚀,而低温部位产生硫酸腐蚀,直接影响船用柴油机的耐久性和可靠性,特别是排气阀的高温腐蚀加速了气阀的损坏漏气。所以对排气阀采取改进措施已成为重要的研究课题。日本钢管株式会社为了提高船用柴油机的高可靠性和高耐久性,从1980年开始,通过对材料学的探讨,对陶瓷排气阀进行了开发
1. Introduction According to L, R, S’s “Engine Fuel Tank Analysis Report”, the fuel currently used by the engine contains 4.0% sulfur and 437 ppm vanadium. The use of this oil, the high temperature parts of high temperature corrosion, and sulfuric acid corrosion occurs at low temperatures, a direct impact on the durability and reliability of marine diesel engines, especially the high temperature corrosion of the exhaust valve to accelerate the gas valve damage. Therefore, the exhaust valve to take measures to improve has become an important research topic. Nippon Steel Pipe Co., Ltd. In order to improve the high reliability and durability of marine diesel engines, from the beginning of 1980, through the study of materials science, ceramic exhaust valves were developed