作者用金相,扫描电子显微镜,X光衍射和电子探针分析技术对国产燃油与典型工况内燃机排气阀所用钢材21—4N与4Cr10Si2Mo的损坏机理进行了研究。着重检验了表面腐蚀保护膜的形貌,组成及其在反复应力作用下的破坏过程。无论汽油机或柴油机气阀,都是在燃气腐蚀与疲劳应力的联合作用下过早地产生所谓“麻坑”而损坏。试验已经充分证明:气阀上采用一种表面处理方法所得到的涂层可以有效地减少并推迟“麻坑”的产生,数倍地提高了使用寿命。本文研究了一种叫做PSR—1号的涂层合金及涂层工艺,在VF—79型气阀涂层专用设备上制备的涂层气阀具有很高的耐磨耐腐蚀性能,其全面技术经济指标均已超过传统堆焊阀。经陆路,内河与海洋广泛行驶考核证明,这种涂层无论对汽油机或柴油机排气阀均有极好的保护能力,目前已通过鉴定并正式投产使用。
The mechanism of failure of The exhaust valves of internal combustion engine with domestic fuels and typical working parameters made by 21—4N and 4Cr10 Si2Mo steel was investigated with metallographic, SEM, X-ray diffration and electron probe methods. Especially~ the mophology, composition and the destruction process under cyclic stress of the surface corrosion protection layer were examined. Exhaust valves of both gasoline and Diesel engine are damaged by combine gas corrosion and fatigue stress, which caused the formation of pits. Experiments show that a surface treatment process forming a protective coating prevents the pit-formation and extends the service lives in se veral folds. The application of a type PSR-1 alloy coating by special coating equipment VF-79 can furnish economically very good anti-corrosion and antiwear properties service tests in land, river and sea transports pcove that this coating is good for both gasoline and Diesel engine valves and performs better than hard surfacing. This process has been commercialized recently.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%