1988 Volume 35 Issue 7 Pages 619-624
Slip casting method for submicron high purity alumina was developed by optimizing the concentration of slip and dispersant, and using resin mold as a substitute for plaster and apparatus with vacuum⋅pressure system. The results obtained were summarized follows:
1) High density green body (>60%) was obtained.
2) High strength alumina (700-800MPa) was obtained after sintering the body at 1250-1300°C. This value is equal to that of alumina sintered under HIP and HP at 1500-1600°C.
3) This high strength comes from uniformally controlled small grain size(1-3μm) of sintered body which results in grain fracturing instead of grain boundary fracturing of conventional alumina ceramics.
