Article(id=1319987034974958157, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319986978137944236, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20210485, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1623686400000, receivedDateStr=2021-06-15, revisedDate=1632067200000, revisedDateStr=2021-09-20, acceptedDate=null, acceptedDateStr=null, onlineDate=1792639033310, onlineDateStr=2026-10-22, pubDate=1647705600000, pubDateStr=2022-03-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792639033310, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792639033310, creator=13701087609, updateTime=1792639033310, updator=13701087609, issue=Issue{id=1319986978137944236, tenantId=1146029695717560320, journalId=1263187385517883426, year='2022', volume='50', issue='3', pageStart='555', pageEnd='876', issueExtLink='null', onlineDate='null', pubDate='1647705600000', pubDateStr='2022-03-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1792639019760, creator='13701087609', updateTime=1792639223744, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319987833767575858, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319986978137944236, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319987833767575859, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319986978137944236, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=819, endPage=827, ext={EN=ArticleExt(id=1319987036648485454, articleId=1319987034974958157, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Hydration Damage Mechanism of BaZrO₃/Al₂O₃ Composite Mold and Its Effect on Directionally Solidified TiAl Alloy, columnId=1263922769897599102, journalTitle=Journal of the Chinese Ceramic Society, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=

BaZrO₃/Al₂O₃ composite molds were prepared via sintering at 1 600 ℃ for 8 h with BaZrO₃ as a surface coating material and Al₂O₃ as a backup coating material. The phase composition and microstructure of the interfacial bonding layer between the face and back layers before and after hydration were investigated by optical microscopy, X-ray diffraction, and scanning electron microscopy with energy dispersive spectroscopy. The hydration process and damage mechanism of the interfacial bonding layer in the mold were analyzed. The effect of mold damage on the directional solidification of TiAl alloy was also investigated via directional solidification tests. The results show that BaZrO₃ and Al₂O₃ generate BaAl₂O₄ at BaZrO₃/Al₂O₃ interface during the high-temperature sintering process; and BaAl₂O₄ generates Ba(AlO(OH)₂)₂, Ba₂Al₄(OH)₁₆ and Ba₃(Al(OH)₆)₂ after hydration, leading to the grain volume change to destroy the intergranular bonding force, the generation of cracks in the mold and the failure of the mold. In the directional solidification process, the generated cracks become a channel for melt penetration of TiAl alloy, resulting in a melt leakage from the mold and the appearance of heterogeneous crystals in the directionally solidified TiAl alloy castings.

, authors=Fuhao XIONG¹, Guangyao CHEN^{1, 2}, Baohua DUAN¹, Lu MAO¹, Xuexian ZHANG¹, Xingli ZOU¹, Chonghe LI^{1, 2}, authorsList=Fuhao XIONG, Guangyao CHEN, Baohua DUAN, Lu MAO, Xuexian ZHANG, Xingli ZOU, Chonghe LI, authorCompany=null, correspAuthors=Guangyao CHEN, Chonghe LI, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1319987036921115215, articleId=1319987034974958157, tenantId=1146029695717560320, journalId=1263187385517883426, language=CN, title=BaZrO₃/Al₂O₃复合模壳水化损毁机理及其对定向凝固TiAl合金的影响, columnId=1263922770220560512, journalTitle=硅酸盐学报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=

以BaZrO₃为面层材料和Al₂O₃为背层材料，在1 600 ℃保温8 h烧结制备BaZrO₃/Al₂O₃复合模壳。通过光学显微镜、X射线衍射仪、扫描电子显微镜结合能谱仪等手段观察了面层与背层界面结合层水化前和水化后的物相与显微结构变化，分析了模壳内界面结合层的水化过程及损毁机理，并通过TiAl合金定向凝固实验，研究了模壳损毁对定向凝固合金的影响。结果表明，模壳面层BaZrO₃与背层Al₂O₃在高温烧结过程中，在界面结合处生成BaAl₂O₄；而BaAl₂O₄在水化后生成Ba（AlO（OH）₂）₂、Ba₂Al₄（OH）₁₆和Ba₃（Al（OH）₆）₂，导致晶粒体积变化破坏晶粒间结合力，引发模壳裂纹的生成而导致损毁。在定向凝固过程中，生成的裂纹会成为TiAl合金熔体渗透的通道，而导致模壳出现熔体泄露，并进一步导致了定向凝固的TiAl合金铸件中杂晶的出现。

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XIONG Fuhao (1994-), Male, Master candidate. E-mail: xiongfuhao@shu.edu.cn

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XIONG Fuhao (1994-), Male, Master candidate. E-mail: xiongfuhao@shu.edu.cn

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熊富豪（1994—），男，硕士。

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熊富豪（1994—），男，硕士。

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