对平均粒径分别为0.31，0.77 μm的2种Al₂O₃粉体（分别记为1^#和2^#）进行低固相含量（体积分数45%）凝胶注模成型，再经冷等静压（CIP）和常压烧结制备得到2种Al₂O₃陶瓷，研究了粉料和CIP压力（100~500 MPa）对Al₂O₃坯体和陶瓷致密化的影响。结果表明：粒径较小Al₂O₃粉体的分散难度较大，所需聚丙烯酸铵分散剂的添加量较高，所得坯体和烧结陶瓷的相对密度较小；随着CIP压力增加，2种Al₂O₃坯体的相对密度增大，孔洞减少，而2种烧结陶瓷的相对密度呈现先增大后减小再趋于稳定的变化趋势，当CIP压力为350~400 MPa时陶瓷的相对密度最大，晶间气孔较少。

Two kinds of Al₂O₃ powder with average grain size of 0.31, 0.77 μm (named as 1^# and 2^#, respectively) was molded by low solid content (volume fraction of 45%) gelcasting, and then was cold isostaticly pressed (CIP) and pressurelessly sintered to obtain Al₂O₃ ceramics. Effects of powder and CIP pressure on densification of Al₂O₃ green body and ceramics were studied. The results show that the Al₂O₃ powder with smaller grain size was more difficult to disperse, and required higher addition amount of polyacrylate ammonium dispersant; the obtained green body and sintered ceramics had lower relative density. With increasing CIP pressure, the relative densities of the two Al₂O₃ green bodies increased, and the pores decreased; the relative densities of the two sintered ceramics showed a trend of increase first, then decrease, and then being stable. When the CIP pressures were 350-400 MPa, the two ceramics had the maximum relative densities and less intercrystalline pores.