Abstract
The effects of adding H3BO3 to composite powder compacts consisting of ZnO and Al2O3 were investigated.
The volumes of ZnO-Al2O3 composite compacts were increased with an increase of gahnite(ZnAl2O4) crystallization at a firing temperature of above 1, 000℃. A compact of equivalent mole ratio had a maximum value of firing expansion compared with the other compacts, a linear expansion value of about 10% at a firing temperature 1, 350℃. H3BO3 dispersed composite compacts with ZnO-Al2O3 of the equivalent mole ratio as matrix sintered with an increase of H3BO3 content, however, the compacts that contain less than 7 wt% H3BO3 addition did not shrink at a firing temperature of 1, 300℃ compared with the size of a green body. A bending strength value of 40 MPa was obtained from a non-contractible fired body with a porosity of 46%.
