热障陶瓷涂层材料对柴油机活塞的影响

发布时间：2018-03-18 10:18

本文选题：热障涂层　切入点：柴油机活塞　出处：《表面技术》2017年02期 　论文类型：期刊论文

【摘要】：目的研究不同陶瓷材料对活塞温度和热应力的影响。方法以氧化镁-部分稳定氧化锆陶瓷(Mg-PSZ)和氧化钇-部分稳定氧化锆陶瓷(Y-PSZ)两种材料为研究对象,在硅铝合金活塞顶部分别喷涂Mg-PSZ和Y-PSZ等离子体,分析讨论了两种不同涂层材料对活塞温度场和热应力场的影响,对比分析了有无陶瓷涂层活塞温度场和热应力场的变化。结果和无涂层活塞相比,Mg-PSZ涂层活塞和Y-PSZ涂层活塞的表面温度明显升高,其表面最高温度分别升高了50.49%和34.81%,但是对应的基体最高温度却分别下降了28.49%和17.34%。同时还发现,Mg-PSZ涂层活塞和Y-PSZ涂层活塞具有相同的温度和热应力分布,并且其活塞基体和无涂层活塞也具有相同的温度和热应力分布。结论 Mg-PSZ涂层活塞和Y-PSZ涂层活塞都会导致活塞表面温度升高,应力增大,但是Y-PSZ对基体温度影响更大,Mg-PSZ对热应力影响更大。
[Abstract]:Objective to study the effect of different ceramic materials on the temperature and thermal stress of piston. Methods two kinds of materials, magnesium oxide partially stabilized zirconia ceramic Mg-PSZ and yttria-partially stabilized zirconia ceramic Y-PSZ, were studied. Mg-PSZ and Y-PSZ plasma were sprayed on the top of Si-Al alloy piston respectively. The effects of two kinds of coating materials on the temperature field and thermal stress field of the piston were analyzed and discussed. The changes of temperature field and thermal stress field of piston with or without ceramic coating were compared. The results showed that the surface temperature of Mg-PSZ coated piston and Y-PSZ coated piston was significantly higher than that of uncoated piston. The surface maximum temperature increased by 50.49% and 34.81 respectively, but the corresponding maximum temperature of the substrate decreased by 28.49% and 17.34.The same temperature and thermal stress distribution of the Mg-PSZ coated piston and Y-PSZ coated piston were also found. The temperature and thermal stress distribution of the piston substrate and uncoated piston are the same. Conclusion both the Mg-PSZ coated piston and Y-PSZ coated piston can cause the surface temperature to increase and the stress to increase. However, the effect of Y-PSZ on the temperature of the matrix is greater than that of Mg-PSZ on the thermal stress.
【作者单位】：中北大学机械与动力工程学院;中国北方发动机研究所(天津);
【分类号】：TG174.453

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