Investigation Of Shape Changes Of Ceramics During Sintering Process
In this study, shape changes of ceramics sintered at 1100ºC, 1400ºC and 1570 ºC were measured and the results were analysed with the reference of green structure. Ceramics were formed by means of gel-casting. Methacrylamide and a crosslinking agent N, N’-methylene bisacrylamide were used for the purpose of shaping alumina pastes. During the work, ceramic pastes were prepared with 30, 40 and 50 grams of alumina . powders with a Al2O3/water ratio of 0.6/1.0 in the form of cylindrical shape and the diameteral values were measured with respect to corresponding height by using a digital micrometer. Later, the specimens were sintered at 1100ºC, 1400ºC and 1570ºC and their shapes were measured at each temperature stages. As a result, the evolution of shape changes was obtained. The densification process occured during sintering was evaluated by using the geometrical data of sintered ceramic specimens. As result; a shrinkage in the volume of ceramics has occurred in sintering process. Amount of shrinkage has decreased as the amount of alumina used has been increased at the end of sintering process. It is noticed that the relative density of ceramics has increased during sintering process. At the end of sintering process, the values of reached reletive density have raised as the amount of alumina used has been increased.
