Effect of Powder and Cold Isostatic Pressing on Densification ofAl2O3 Ceramics Molded by Gelcasting
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摘要: 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。Abstract: 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.
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Keywords:
- Al2O3 powder /
- cold isostatic pressing /
- gelcasting /
- agglomeration /
- Al2O3 ceramic
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[1] 田清波,代金山,吕志杰.NH4F含量及煅烧工艺对氧化铝相变及α-Al2O3微观形貌的影响[J].人工晶体学报,2015,44(12):3737-3741. [2] 刘文燕,徐坦,刘璐,等.氧化钇对氧化铝陶瓷致密化的影响[J].人工晶体学报,2016,45(7):1741-1745. [3] 周云,刘伯洋,范春华.一种深海耐压氧化铝陶瓷空心浮球及其制备方法:103979938A[P].2014-04-25. [4] 李县辉,燕青芝,韩永军,等.结构陶瓷凝胶注模技术研究进展[J].陶瓷学报,2014,35(3):243-248. [5] ZENG J Z,YANG J,WAN W,et al.Effect of Al2O3 particle size on preparation and properties of ZTA ceramics formed by gelcasting[J].Ceramics International, 2014,40(4):5333-5338.
[6] TAR AI`G G,FERREIRA J M F,FONSECA A T,et al.Influence of particle size distribution on colloidal processing of alumina[J].Journal of the European Ceramic Society, 1998,18(3):249-253.
[7] 刘炜,杨金龙,董英鸽,等.颗粒级配对凝胶注模成型氧化铝陶瓷的影响[J].人工晶体学报,2009,38(增刊1):211-214. [8] PIETRZAK E,SAKKA Y,NAKAMURA J,et al.Dense alumina ceramics obtained by gelcasting and cold isostatic pressing with the use of 2-carboxyethyl acrylate[J].Archives of Metallurgy and Materials,2018,63(3):1393-1400.
[9] 周龙捷,黄勇,谢志鹏,等.凝胶注模成型制备高性能的氮化硅陶瓷(Ⅱ)[J].材料研究学报,2001(1):55-60. [10] ZHANG H,WANG H,GU H G,et al.Preparation of transparent MgO·1.8Al2O3 spinel ceramics by aqueous gelcasting,presintering and hot isostatic pressing[J].Journal of the European Ceramic Society, 2018,38(11):4057-4063.
[11] 刘兵,彭超群,王日初,等.Al2O3悬浮液分散稳定性的影响因素[J].中国有色金属学报,2012,22(10):2833-2838. [12] 李仲谨,王芬,魏红,等.聚丙烯酸铵对氧化铝料浆分散行为的研究[J].陶瓷,2002(5):27-30. [13] 芦令超,申玉芳,常钧,等.氧化铝陶瓷料浆流变性的研究[J].硅酸盐通报,2003,31(4):36-40. [14] HA C G,JUNG Y G,KIM J W,et al.Effect of particle size on gelcasting process and green properties in alumina[J].Materials Science and Engineering:A, 2002,337(1/2):212-221.
[15] 孙阳,陈瑞峰,丁钰,等.悬浮体中团聚体的产生机理及其对材料结构与性能的影响[J].硅酸盐学报,2009,37(2):264-269. [16] 高栋河.粉体特性对陶瓷性能的影响[J].电子元件与材料,1996,15(5):53-54. [17] 谢甜甜,姜胜林,范茂彦.等静压辅助凝胶注模成型制备高致密Ba0.7Sr0.3TiO3陶瓷[J].材料导报,2008,22(12):78-80. [18] 布鲁克.陶瓷工艺:第Ⅱ部分[M].清华大学新型陶瓷与精细工艺国家重点实验室,译.北京:科学出版社,1999:82-85.
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