I am trying to sinter my samples at 1300 degree celsius in Vacuum and I came to know about a technique from some lab technicians that it can be done using box or muffle furnace itself. The idea is is to keep your samples in a silicate glass tube, creat vacuum inside it and seat it. Then perform the sintering in normal muffle furnace. But I can not find any supporting jourals to back up this method. Can someone help me with links to such research papers if anyone has come across with such papers?
At 1300°C all silicate glasses are liquid and cannot hold their shape. The only exception is quartz glass, but flasks made of quartz glass are also destroyed by crystallization at 1300°C. Nevertheless, the idea of metal sintering under the glass melt is not wrong. In the sixties, due to the lack of vacuum ovens, this technology was successfully tested. Metal products were sintered under molten glass in glass furnaces. Of course, it only works when sintering metals, because ceramics are dissolved by the glass melt.
Vadim Verlotski Thank you. It was a mistake from my side. they are using quartz glass and not silicate glass. But I can not find any journals who adopted this type of sintering in their work.
Hi Umanath Puthillam,
Quartz glass does not become liquid at 1300°C, but this material has another problem: crystallization. The crystallization of the amorphous SiO2 in cristobalite causes a large change in volume and the material becomes pulverized. Crystallization during long high-temperature aging begins at temperatures below 1000°C, which is why you cannot use the quartz glass casings above 1100-1150°C.
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