Microstructure and characterization of interfacial phases of sapphire/sapphire joint bonded using Bi₂O₃-B₂O₃-ZnO glass

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• 作者：Wei Guo^a ; Tiesong Lin^a ; ^{hitjoining@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Peng He^a ; ^{hithepeng@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Dusan P. Sekulic^a ; ^b ; ^{dusan.sekulicd@uky.edu" class="auth_mail" title="E-mail the corresponding author} ; Zhan Sun^a ; Panpan Lin^a ; Xiao Shan^c ; Guangjie Feng^a ; Bingzhi Wu^a ; Maochang Wang^a
• 关键词：Sapphire joining ; Bismuth borate zinc glass ; Wettability ; Zinc aluminate (ZnAl2O4) ; Microstructure
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：1073-1081
• 全文大小：4149 K

文摘

Bismuth borate zinc glass, 50Bi₂O₃–30B₂O₃–20ZnO (mol.%), was used as a braze intended to join sapphire. Thermal properties of the glass were all experimentally determined. The wettability of the glass on sapphire was investigated. The contact angle not greater than 11.3° was obtained in air at temperatures of ≥700 °C. Subsequently, sapphire was successfully joined to themselves at 700 °C for 20 min. The microstructure of the joint was studied and the interfacial phases were characterized. The results showed that the ZnAl₂O₄ phase was formed as a result of the reaction between the sapphire substrate and ZnO from the glass. The mechanical integrity of the joints was investigated. The joints with an average room shear strength of 70 MPa were achieved. The fracture analysis indicated that the fracture occurred within the glass interlayer rather than at the sapphire/glass interface, hence indicating a good bonding of the glass with sapphire.