凝胶浇注结合固相烧结制备具有多级孔结构的碳化硅陶瓷

doi:10.15541/jim20150390

摘要/Abstract

摘要：

以Isobam作为胶凝剂, 聚甲基丙烯酸甲酯(PMMA)作为泡沫稳定剂和造孔剂, 结合固相烧结制备出具有多级孔结构的碳化硅陶瓷, 并研究了PMMA添加量、球磨机转速以及烧结温度对多孔陶瓷结构及性能的影响。结果表明: 当球磨机转速为220 r/min、烧结温度为2100℃时, 随着PMMA添加量由5wt%增加到20wt%, 发泡过程受到抑制, 但是泡沫的稳定性增强, 所得多孔陶瓷的气孔率在51.5%~72.8%之间, 压缩强度介于7.9~48.2 MPa之间; 当PMMA加入量为20wt%时, 随着球磨机转速由220 r/min增大到280 r/min, 加剧了浆料的发泡过程, 2100℃烧结所得多孔陶瓷的气孔率逐步增大, 气孔孔径变大; 当球磨机转速为220 r/min, PMMA加入量为20wt%时, 随着烧结温度的升高, 气孔率逐渐降低, 力学性能有所提高。

关键词: 固相烧结, 碳化硅, 凝胶浇注, Isobam, PMMA, 发泡

Abstract:

Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering. A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent. The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature. With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased. When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100℃ varied from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa. With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100℃ increased. While the sintering temperature increasing from 2050 to 2150℃, the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.

Key words: solid state sintering, silicon carbide, gelcasting, Isobam, PMMA, foaming

中图分类号:

TQ174

王锋, 高兆芬, 徐甲强, 曾宇平. 凝胶浇注结合固相烧结制备具有多级孔结构的碳化硅陶瓷[J]. 无机材料学报, 2016, 31(3): 305-310.

WANG Feng, GAO Zhao-Fen, XU Jia-Qiang, ZENG Yu-Ping. Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering[J]. Journal of Inorganic Materials, 2016, 31(3): 305-310.

图/表 7

图1 PMMA的SEM照片

Fig. 1 SEM image of PMMA

图2 球磨机转速为220 r/min, 烧结温度为2100℃时, 不同PMMA加入量的多孔碳化硅陶瓷断面形貌

Fig. 2 Fracture surface microstructures of porous SiC ceramics with different PMMA contents, fabricated at rotation speed of 220 r/min and sintered at 2100℃(a, b) 5wt%; (c, d) 10wt%; (e, f) 15wt%; (g, h) 20wt%

图3 球磨机转速220 r/min, 烧结温度2100℃时, 不同PMMA加入量对多孔碳化硅陶瓷气孔率和力学性能的影响

Fig. 3 Porosities and mechanical properties of porous SiC ceramics with different PMMA contents, fabricated at rotation speed of 220 r/min and sintered at 2100℃

图4 PMMA添加量为20wt%, 烧结温度为2100℃时, 不同转速下多孔碳化硅陶瓷断面形貌

Fig. 4 Fracture surface microstructure of porous SiC ceramics with 20wt% PMMA fabricated at different rotation speeds and sintered at 2100℃ (a) 240 r/min; (b) 260 r/min; (c) 280 r/min

图5 PMMA添加量为20wt%, 烧结温度为2100℃时, 不同转速对多孔碳化硅陶瓷气孔率和力学性能的影响

Fig. 5 Porosities and mechanical properties of porous SiC ceramics with 20wt% PMMA fabricated at different rotation speeds and sintered at 2100℃

图6 球磨机转速为220 r/min, PMMA添加量为20wt%时, 不同烧结温度下多孔碳化硅陶瓷断面形貌

Fig. 6 Fracture surface microstructures of porous SiC ceramics with 20wt% PMMA sintered at different temperatures, fabricated at rotation speed of 220 r/min(a) 2050℃; (b) 2100℃; (c) 2150℃

图7 球磨机转速为220 r/min, PMMA添加量为20wt%时, 不同烧结温度对多孔碳化硅陶瓷气孔率和力学性能的影响

Fig. 7 Porosities and mechanical properties of porous SiC ceramics with 20wt% PMMA sintered at different temperatures, fabricated at rotation speed of 220 r/min

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