Microstructure Modification of CGDS and HVOF Sprayed CoNiCrAlY Bond Coat Remelted by Electron Beam

Procedia Materials Science Pub Date : 2016-01-01 DOI:10.1016/j.mspro.2016.03.016

Petra Gavendová , Jan Čížek , Jan Čupera , Makoto Hasegawa , Ivo Dlouhý

{"title":"Microstructure Modification of CGDS and HVOF Sprayed CoNiCrAlY Bond Coat Remelted by Electron Beam","authors":"Petra Gavendová , Jan Čížek , Jan Čupera , Makoto Hasegawa , Ivo Dlouhý","doi":"10.1016/j.mspro.2016.03.016","DOIUrl":null,"url":null,"abstract":"<div><p>In the present work two techniques are combined to optimize bond coat properties before thermal barrier coating (TBC) application, the cold gas dynamic spraying (CGDS) and electron beam remelting (EB). Results of the work focused on comparison of high velocity oxygen fuel (HVOF) and CGDS CoNiCrAlY bond coats are firstly presented. Than the effect of the electron beam remelting of the CoNiCrAlY coating manufactured by HVOF and CGDS deposition techniques is deeply investigated. The CoNiCrAlY bond coat to Inconel substrate interface displayed locations with very poor bonding, in larger extent for the states prepared by HVOF comparing to CGDS. The bond coats prepared by both ways being EB remelted are typically removal of the defects on the substrate to bond coat interface. The microstructure of the bond coat after this treatment is formed by Inconel fine grain layer being followed by the surface layer consisting of elongated dendritic microstructure. An increased porosity has been observed in interdendritical space in larger extent for CGDS samples.</p></div>","PeriodicalId":101041,"journal":{"name":"Procedia Materials Science","volume":"12 ","pages":"Pages 89-94"},"PeriodicalIF":0.0000,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mspro.2016.03.016","citationCount":"15","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Procedia Materials Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2211812816000250","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 15

Abstract

In the present work two techniques are combined to optimize bond coat properties before thermal barrier coating (TBC) application, the cold gas dynamic spraying (CGDS) and electron beam remelting (EB). Results of the work focused on comparison of high velocity oxygen fuel (HVOF) and CGDS CoNiCrAlY bond coats are firstly presented. Than the effect of the electron beam remelting of the CoNiCrAlY coating manufactured by HVOF and CGDS deposition techniques is deeply investigated. The CoNiCrAlY bond coat to Inconel substrate interface displayed locations with very poor bonding, in larger extent for the states prepared by HVOF comparing to CGDS. The bond coats prepared by both ways being EB remelted are typically removal of the defects on the substrate to bond coat interface. The microstructure of the bond coat after this treatment is formed by Inconel fine grain layer being followed by the surface layer consisting of elongated dendritic microstructure. An increased porosity has been observed in interdendritical space in larger extent for CGDS samples.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

电子束重熔CGDS和HVOF喷涂锥形粘接层的微观结构改性

在热障涂层(TBC)应用前，将冷气动态喷涂(CGDS)和电子束重熔(EB)两种技术相结合，对粘结层性能进行优化。本文首先介绍了高速氧燃料(HVOF)和CGDS CoNiCrAlY结合涂层的对比研究结果。在此基础上，深入研究了电子束重熔对HVOF和CGDS沉积技术制备的CoNiCrAlY涂层的影响。CoNiCrAlY结合涂层与Inconel基体界面显示出结合非常差的位置，与CGDS相比，HVOF制备的状态在很大程度上是如此。用两种方法制备的粘接层经EB重熔后，典型地去除了基材与粘接层界面上的缺陷。处理后的结合层微观组织为:铬镍铁合金细晶层后是表层的细长枝晶组织。在CGDS样品中，在更大程度上观察到树枝间空间孔隙度的增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Procedia Materials Science

自引率

0.00%

发文量