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大小:2.19 MB
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时间:2020-04-30
《喷涂参数对内送粉等离子喷枪制备YSZ涂层微观结构和性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第5卷第3期热喷涂技术、,01.5.No.32013年9月ThermalSprayTechnologySep.,2013喷涂参数对内送粉等离子喷枪制备YSZ涂层微观结构和性能的影响乔新义,史萌,马林,汪瑞军(中国农业机械化科学研究院,北京100083)摘要:为了进一步提高大气等离子喷涂YSZ热障涂层性能并降低其成产成本,开发了内送粉等离子喷枪。本文采用SprayWatch2i在线监测系统测量了YSZ粉末粒子温度和飞行速度,采用实验室手段表征了涂层的微观结构、结合强度、弯曲性能和抗热震性能。研究结果表明,内送粉方式下喷涂距离对涂层微观
2、结构租『生能的影响规律与外送粉相似,而电流和主气流量表现出了独特的作用效果:随电流的增大,涂层综合性能先增加后降低,高电流下制备的涂层结合强度较低;在3O~50L/min范围内,增大主气流量可显著提高涂层结合强度。与外送粉最优参数制备YSZ涂层相比,内送粉时的功率消耗大幅降低,但粒子熔化效果明显增强,相同送粉速率下粉末沉积效率略有增加,涂层热循环寿命有所提高。关键词:内送粉;等离子喷枪;氧化钇稳定氧化锆;热障涂层中图分类号:TG174.4文献标识码:A文章编号:1674.7127(2013)09.0003.09DoI10.3969~
3、.jssn.1674-7127.2013.03.001EffectofSprayParametersonMicrostructureandPropertiesofYSZCoatingsSprayedbyPlasmaSprayTorchinInternalFeedstockModeQIAOXin—yi,SHIMeng,MALin,WANGRui-jun(ChineseAcademyofAgriculturalMechanizationSciences,Beijing100083,China)Abstract:Employinginte
4、rnalfeedstockmodeisanefectivemethodtoimproveatmosphericplasmasprayedceramiccoatingsqualityandobtainhighpowderdepositioneficiency.Forthispurpose,aplasmaspraytorchininternalfeedstockmodeWasresearchedanddeveloped.Inthispaper,aparametricstudywasconductedtodeterminetheefect
5、ofintemalfeedstockplasmasprayprocessparameters,includingarCpower,spraydistance,andprimarygasflowrate,onthefinalmicrostructureandpropertiesofcoatingssprayedfromnano—agglomeratedyttia-stabilizedzirconiapowders.Theresultsshowthatininternalfeedstockmode,efectofspraydistanc
6、eoncoatingperformanceissimilartoexternalfeedstockmode,butarCpowerandprimarygasflowratehaveanovelinfluenceoncoatingmicrostmctureandproperties.WiththeincreaseofarCpower,coatingintegrityperformanceincreasesfirstlyandthendecreases.Surprisingly,coatingadhesionstrengthisvery
7、lowatahJlpowerleve1.Withtheincrementofprimarygasflowrate,coatingadhesionstrengthincreasesgradually,becausehighgasflowCanimprovetherigidityofplasmajet,reducingthebadefectofcoldcarriergasonplasmajet.ComparedwithYSZcoatingssprayedbyexternalfeedstockmode,internalfeedstockm
8、odesprayedcoatings,inwhichparticlesweremeltedwellwithlowpowerconsumption,havebetterperformanceandhigherpowderdepositi
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