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.
|Number of pages||9|
|Journal||Journal of the European Ceramic Society|
|State||Published - Mar 1 2017|
Bibliographical noteFunding Information:
This research is supported by “ National Natural Science Foundation of China (NSFC, Grant number 51475103 , 51474081 )” and “The funds for Distinguished Young Scientists of Heilongjiang Province (Grant number JC20151 1)”. Dusan P. Sekulic (DPS) acknowledges the support through “the Distinguished 1000 Plan Foreign Professor appointment” at the Harbin Institute of Technology, PR China.
© 2016 Elsevier Ltd
- Bismuth borate zinc glass
- Sapphire joining
- Zinc aluminate (ZnAlO)
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry