基于Al粉成孔作用制备多孔氧化铝陶瓷型芯
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摘要
采用热压注法制备多孔氧化铝基陶瓷型芯,研究了Al_2O_3粉粉末粒度分布、Al粉加入量和保温时间对陶瓷型芯性能的影响.研究结果表明:Al_2O_3粉粉末粒度分布显著影响陶瓷型芯的性能,当加入的Al_2O_3粉粉末粒径分别为80,58和45μm,且三种Al_2O_3粉粉末的质量比为1∶1∶1时,制备的陶瓷型芯性能较好;当Al粉加入量(质量分数)为10%时,型芯的综合性能最好,其线性收缩率为-0.85%,抗弯强度为30.43 MPa,气孔率为46.99%,且保温时间对样品的性能影响很小,在1 500℃下保温5h,样品性能稳定,该型芯有望满足陶瓷型芯的铸造要求.
The porous alumina-based ceramic core was built by hot-pressing process.The influences of alumina grain distribution,aluminium content and sintering time on the properties of ceramic cores were studied.The results indicate that alumina grain distribution has significant effects on the properties and compared to other distributions,and ceramic cores made of equal amount of diameters of 80,58 and 45μm possesses better comprehensive performance.Ceramic cores shows increasingly high apparent porosity with the increasing amount of aluminium and ceramic cores with 10% aluminium content have linear shrinkage of-0.85%,bending strength of 30.43 MPa and apparent porosity of 46.99%,there is no obvious influence of sintering time on the properties of cores.After sintered at 1500 ℃for 5h,ceramic cores still have stable properties,which can meet the demands of ceramic cores in casting area.
The porous alumina-based ceramic core was built by hot-pressing process.The influences of alumina grain distribution,aluminium content and sintering time on the properties of ceramic cores were studied.The results indicate that alumina grain distribution has significant effects on the properties and compared to other distributions,and ceramic cores made of equal amount of diameters of 80,58 and 45μm possesses better comprehensive performance.Ceramic cores shows increasingly high apparent porosity with the increasing amount of aluminium and ceramic cores with 10% aluminium content have linear shrinkage of-0.85%,bending strength of 30.43 MPa and apparent porosity of 46.99%,there is no obvious influence of sintering time on the properties of cores.After sintered at 1500 ℃for 5h,ceramic cores still have stable properties,which can meet the demands of ceramic cores in casting area.
引文
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[3]杨治刚,余建波,李传军,等.热固性硅树脂压注法制备多孔硅基陶瓷型芯研究[J].无机材料学报,2015,30(2):147-152.
[4]龙永成,刘志义,郭敏,等.烧结温度对硅基陶瓷型芯性能的影响[J].粉末冶金材料科学与工程,2011,16(4):591-596.
[5]徐子烨,玄伟东,张金垚,等.烧结温度和粒度分布对多孔氧化硅陶瓷型芯材料性能的影响[J].上海大学学报:自然科学版,2015,21(1):28-37.
[6]赵效忠.陶瓷型芯的制备与使用[M].北京:科学出版社,2013.
[7]王宝全,余建波,任忠鸣,等.多孔铝基陶瓷型芯的制备及其性能[J].无机材料学报,2012,27(3):239-244.
[8]Greskovich C D,de Vries R C.Alumina-based ceramics for core materials:US,4156614[P].1979-05-29.
[9]Qin Yexia,Pan Wei.Effect of silica sol on the properties of alumina-based ceramic core composites[J].Materials Science and Engineering:A,2009,508(1):71-75.
[10]曹腊梅,杨耀武,才广慧,等.单晶叶片用氧化铝基陶瓷型芯AC-1[J].材料工程,1997(9):21-23.
[11]薛明,曹腊梅.单晶空心叶片用AC-2陶瓷型芯的组织和性能研究[J].材料工程,2002(4):33-34,37.
[12]成来飞,张立同,徐永东,等.氧化铝陶瓷型芯的制作方法以及脱芯方法:中国,101229975A[P].2008-07-30.
[13]赵洪亮,楼琅洪,胡壮麒.Al2O3/SiO2纳米复合陶瓷型芯材料的制备与性能[J].材料研究学报,2002,16(6):650-654.
[14]Sangeeta D,Niskayuna N Y.Method of dissolving or leaching ceramic cores in airfoils:US,5779809[P].1998-07-14.
[15]何贤昶.陶瓷材料概论[M].上海:上海科学普及出版社,2005.
[16]Chen Y F,Wang M C,Hon M H,Phase transformation and growth of mullite in kaolin ceramics[J].Journal of European Ceramic Society,2004(24):2389-2397.
[17]Han Lingfeng,Xu Zhenliang,Cao Yue,et al.Preparation,characterization and permeation property of Al2O3,Al2O3-SiO2 and Al2O3-kaolin hollow fiber membranes[J].Journal of Membrane Science,2011,372(1):154-164.