Fabrication of glass-ceramics composite by infiltration of lithium tetraborate glass into porous magnesium aluminate spinel ceramic

Nattawat KULRAT; Chumphol BUSABOK; Saweat  INTARASIRI; Somsak  DANGTIP; Wasana  KHONGWONG

doi:10.55713/jmmm.v33i1.1614

Authors

Nattawat KULRAT Department of Physics and Nanotec CoE at Mahidol University, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
Chumphol BUSABOK Expert Centre of Innovative Materials, Thailand Institute of Scientific and Technological Research (TISTR) Pathum Thani, 12120, Thailand
Saweat INTARASIRI Science and Technology Research Institute, Chiang Mai University, Chiang Mai, 50200, Thailand
Somsak DANGTIP Department of Physics and Nanotec CoE at Mahidol University, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand; Institute of Nuclear Technology, Nakhon Nayok, 26120, Thailand Thailand
Wasana KHONGWONG Expert Centre of Innovative Materials, Thailand Institute of Scientific and Technological Research (TISTR) Pathum Thani, 12120, Thailand

DOI:

https://doi.org/10.55713/jmmm.v33i1.1614

Keywords:

Glass-ceramics composite, glass infiltration, lithium tetraborate glass, magnesium aluminate spinel, porous

Abstract

Magnesium aluminate spinel (MAS) glass-ceramics composite has excellent mechanical and optical properties. It can be obtained from porous ceramic by infiltrating the proper choice of glass. In this study, porous MAS ceramic was prepared by conventional sintering from MAS powder to reach a bulk density of 2.48 g∙cm^-3 (70.1% of relative density). The porous MAS ceramic was then infiltrated with molten lithium tetraborate glass (Li₂B₄O₇; LTB) at 950℃ for 30 (IF30) and 60 (IF60) min. They were left to cool down to 700℃ inside the furnace before being taken out to quench in ambient. The glass-ceramics composite was obtained with 98.7% and 92.1% relative density for IF30 and IF60 cases, respectively. SEM images reveal a lower degree of porosity in the IF30 case, which achieves higher flexural strength of 119.7 MPa. X-ray diffraction and Raman spectroscopy indicate that Mg₂B₂O₅ phase (at 2q =35°) and B₂O₅ functional group (at 847 cm^-1) are formed during infiltration. Consequently, their micro vickers hardness increased (3.41®5.53®6.16 GPa).

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