发动机活塞顶部陶瓷组织和耐烧蚀性研究  

Study on Structure and Ablation Resistance of Ceramic Coating on the Top of Engine Piston

作　　者：颜君衡 

机构地区：[1]曲阜金皇活塞股份有限公司

出　　处：《内燃机与配件》2016年第6期8-11,共4页Internal Combustion Engine & Parts

摘　　要：为提高新开发的天然气发动机活塞的使用性能,改善活塞顶部出现的烧蚀等问题,对天然气发动机活塞顶部进行了硬氧处理和镀陶处理。通过SEM和XRD分别研究了其组织和物相的变化,并进行了活塞顶部陶瓷耐烧蚀性能和热冲击性能试验研究。结果表明:镀陶处理膜层存在均匀分布的放电通道,通道周围堆积有熔融的颗粒。主要物相为α-Al2O3、γ-Al2O3、SiO2和一定量的非晶相,以及莫来石(3Al2O3·2SiO2)。抗热蚀性能测试显示,未表面处理的活塞在加热到630s时,活塞顶部测温点温度达到433℃,顶面出现熔融现象;顶部硬氧的活塞在加热到660s时,活塞顶部测温点温度达到456℃,顶面出现熔融现象;顶部陶瓷活塞在加热到1350s时,活塞顶部测温点温度达到500℃,顶面出现熔融现象。可见顶部陶瓷活塞耐热性显著优于顶部硬氧活塞和未表面处理活塞。强化热冲击500次,陶瓷层未脱落,起皮,微弧氧化陶瓷层耐热冲击性良好。In order to improve the performance of the engine piston in new natural gas automobile, and other issues, such as erosion, appear on the top of piston, anodic oxidation and PEO treatment were carried on it. Structure and phase changes were studied by SEM and XRD, and the ablation resist- ance and thermal shock resistance of the ceramic coating on the top of engine piston were investigated. The result showed that discharge channels distributed evenly in the PEO ceramic coating, and molten particles surrounded them. The main phases of the ceramic coating are α - Al2O3, γ - Al2O3, SiO2, 3Al2O3 · 2SiO2 and a certain mount of amorphous. Result of ablation resistance test displayed that when the top of piston appeared melting phenomenon, the untreated piston was heated to 433℃ in 630s, the piston treated by anodic oxidation was heated to 456℃in 660s, while the piston covered by PEO ceramic coating was heated to 500℃ in 1350s. So, the heat resistance of the piston treated by PEO is much better than the piston treated by anodic oxidation and untreated. After 500 times thermal shock resistance tests, the ceramic coating was not found to fall off, indicating a good thermal shock resistance.

关 键 词：天然气发动机活塞 陶瓷耐烧蚀试验 耐热冲击性试验 

分 类 号：U464.174[机械工程—车辆工程]