论文部分内容阅读
在现时使用低质重油日益增多的情况下,如何提高船用柴油机气缸套和活塞环的寿命是航运部门亟待解决的一个问题.本研究工作即针对这一课题,将离子软氮化技术推广到该领域.为此,选取了十种不同成分用于制造气缸套和活塞环的灰口铸铁作为试样,以丙酮/氨为混合气源,在不同温度、时间、气压和加钛催渗的条件下作了大量炉次试验,并采用现有可利用的各种金属检验分析的方法,考查不同参数对渗层的影响,获得了大量实测数据,找到了灰口铸铁离子软氮化及加钛离子软氮化的最佳参数并建立了一整套典型的稳定的工艺规程.经本工艺处理后的柴油机气缸套和活塞环,通过实机运转考验后,其磨损率比国内外有关文献上介绍的低2—4倍,从而说明本工艺是一种经济效果特别显著的新工艺.
In the current situation where the use of low-quality heavy oil is increasing day by day, how to improve the life span of marine diesel cylinder liner and piston ring is a problem to be solved urgently by the shipping department.This research aims to address this issue by extending ion soft nitriding technology to Area.Therefore, ten kinds of gray cast iron with different composition for manufacturing cylinder liner and piston ring were selected as the sample, and acetone / ammonia was used as the mixed gas source under the conditions of different temperature, time, pressure and titanium permeation Under a large number of furnaces under the test, and the use of existing available methods of various metal test analysis of different parameters on the impact of seepage, obtained a large number of measured data to find the gray cast iron ion nitrocarburizing and titanium Ion nitriding the best parameters and the establishment of a set of typical and stable process specifications.Diesel engine cylinder liner and piston ring after the process, after the real machine running test, the wear rate than the literature on the domestic and foreign introduced 2-4 times lower, indicating that the process is a particularly significant economic effect of new technology.