PVB对梯度通孔结构SiC陶瓷显微结构和性能的影响
Effect of PVB on Microstructure and Properties of SiC Ceramics with Gradient Pore Channel Structure
摘 要
将叔丁醇(TBA)、聚乙烯醇缩丁醛(PVB)和SiC粉及烧结助剂配制成陶瓷浆料, 通过定向冷冻和低温真空干燥的方法制备了具有梯度通孔结构的SiC陶瓷;研究了PVB含量对梯度通孔结构SiC陶瓷孔隙率、显微结构和力学性能的影响。结果表明: 随PVB含量的增加, 梯度通孔结构SiC陶瓷的孔径逐渐变小, 抗压缩强度明显增大, 开孔率变化不大;含PVB体积分数为3% 的SiC陶瓷坯体, 通过1 400 ℃的烧结, 其开孔率为62.4%, 轴向抗压强度可达87.5 MPa。
梯度通孔
定向冷冻
聚乙烯醇缩丁醛
SiC ceramic
gradient pore channel
directional freeze-casting
polyvinyl butyral
Abstract
SiC ceramics with gradient pore channel structure were fabricated by directional freeze-casting and low temperature vacuum drying method. A slurry was selected, which consisted of tert-butyl alcohol(TBA), polyvinyl butyral(PVB), SiC powders and sintering additives. Effect of PVB content on porosity, microstructure and mechanical properties of the SiC ceramics with gradient pore channel structure was studied. The results show that pore size gradually decreased and compressive strength of the SiC ceramics increased with the increase of PVB content, but open porosity had little change. The SiC ceramics containing 3vol% PVB sintered at 1 400 ℃ had an axial compressive strength of 87.5 MPa and a porosity of 62.4%.
中图分类号 TQ174.75
所属栏目
基金项目 国家自然科学基金资助项目(90816019); 国家“863”科技支撑计划重点项目(2007AA03Z435); 国家“973”科技支撑计划重点项目(2006CB605207-2)
收稿日期 2010/12/4
修改稿日期 2011/1/8
网络出版日期
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备注王少锋(1969-), 男, 北京人, 博士研究生。
引用该论文: WANG Shao-feng,WANG Chang-an,SUN Jia-lin,HUANG Yong. Effect of PVB on Microstructure and Properties of SiC Ceramics with Gradient Pore Channel Structure[J]. Materials for mechancial engineering, 2011, 35(12): 6～9
王少锋,汪长安,孙加林,黄勇. PVB对梯度通孔结构SiC陶瓷显微结构和性能的影响[J]. 机械工程材料, 2011, 35(12): 6～9
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参考文献
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【4】MORITZ T, RICHTER H J.Ceramic bodies with complex geometries and ceramic shells by freeze casting using ice as mold material[J].J Am Ceram Soc, 2006,89(8):2394-2398.
【5】ARAKI K, HALLORAN J W.Room-temperature freeze casting for ceramics with nonaqueous sublimable vehicles in the naphthalene-camphor eutectic system[J].J Am Ceram Soc, 2004,87(11):2014-2019.
【6】KOH Y H, SONG J H, LEE E J,et al.Freezing dilute ceramic/camphene slurry for ultra-high porosity ceramics with completely intercon interconnected pore networks[J].J Am Ceram Soc, 2006 89(10):3089-3093.
【7】CHEN R F, WANG C A, HUANG Y,et al. Ceramics with special porous structures fabricated by freeze-gelcasting: using tert-butyl alcohol as a template[J].J Am Ceram Soc, 2007,90(11):3478-3484.
【8】HU L F, WANG C A, HUANG Y,et al,Control of pore channel size during freeze casting of porous YSZ ceramics with unidirectionally aligned channels using different freezing temperatures[J]. J Euro Ceram Soc, 2010,30(16):3389-3396.
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【10】WANG S F, WAG C A, SUNG J L,et al.Fabrication, structure and properties of porous SiC ceramics with high porosity and high strength[J]. Advanced Materials Research,2010,105/106:608-611.
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