Glass as the Infiltration Melt and the Joining Layer for Ceramics

• Main Authors: Li-Bin Chang, 張禮濱
• Other Authors: Yung-Jen Lin
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/81959478633768100309

碩士 === 大同大學 === 材料工程研究所 === 88 === The goal of this research is to fabricate alumina/glass ceramics by glass infiltration. Al2O3 powder was pressed uniaxially in WC die at 100MPa for 30 second to form the disc-shaped pellets, then heated up to 1200℃ for 2 hours to form a porous pellets with moderate strength for subsequent infiltration. And then melt-infiltration of glass into porous alumina at 1200℃~1250℃ by capillary action was perform. The infiltrated pellets can be further densified by heat treatment at 1350℃ for one hour. The activation energy of the infiltration process was 621kJ/mole, After saturation infiltrating glass into porous Al2O3, it’s bulk density approach 3.2g/cm3, and open porosity reach zero, flexural strength was 150MPa, and microhardness was Hv1100. Another goal of this research is to join mullite composite with Y-Al-Si glasses. Y-Al-Si glass can be used to join mullite-based ceramics when heating at 1400~1500℃ for different time. Glasses would crystallize after heating for 3 hours, the thickness of interlayer was about 10μm, and without distinct interface between base piece and interlayer.