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助烧剂对SiC多孔陶瓷性能的影响
摘 要
本研究以碳化硅为主料,以羧甲基纤维素钠(CMC)为造孔剂,分别用SiO2-Y2O3-Al2O3和SiO2-高岭土作为助烧剂,制备了多孔碳化硅陶瓷,研究了不同SiO2-Y2O3-Al2O3和SiO2-高岭土含量对多孔碳化硅材料结构和力学性能的影响。
SiO2-Y2O3-Al2O3和SiO2-高岭土的含量影响碳化硅多孔陶瓷的气孔率、硬度及其抗折强度。本次实验采用了阿基米德法测量多孔陶瓷的气孔率,采用洛氏硬度仪测量了其硬度,采用万能材料试验机测量了其抗折强度。实验结果表明:以SiO2-Y2O3-Al2O3为助烧剂,且SiO2-Y2O3-Al2O3含量为20%时,所制备的碳化硅多孔陶瓷性能较以SiO2-高岭土为助烧剂时优越。以SiO2-Y2O3-Al2O3为助烧剂,在1500℃可以制备出性能较好的多孔碳化硅陶瓷。当SiO2-Y2O3-Al2O3含量为20%时,所制备的碳化硅多孔陶瓷兼具有较大的气孔率和优良的力学性能,其开口气孔率为23.73%,硬度及抗折强度分别为62和15.47MPa,从断口可以看出气孔较多且分布均匀。
关键词: 碳化硅 SiO2-Y2O3-Al2O3 SiO2-高岭土 多孔陶瓷
Title Effect of Sintering Aids on the Properties of Porous SiC Ceramics
Abstract
This study uses silicon carbide as main material, with carboxymethyl cellulose(CMC) as the pore-forming agent, respectively, with SiO2-Y2O3-Al2O3 and SiO2-kaolin as the sintering agent, preparation of porous silicon carbide ceramics, studied different SiO2-Y2O3-Al2O3 and SiO2-kaolin content on the structure and mechanical properties of porous silicon carbide material effect.
SiO2-Y2O3-Al2O3 and SiO2- kaolin content influence stomatal porous SiC ceramics rate, hardness and bending strength. In this experiment, the porosity of porous ceramics by measuring Archimedes rate, its hardness was measured by Rockwell hardness tester, the bending strength was measured using a universal testing machine. The experimental results show that: with SiO2-Y2O3-Al2O3 as sintering aid, and the content of SiO2-Y2O3-Al2O3 was 20%, the performances of porous SiC ceramics prepared with kaolin than SiO2-kaolin as sintering aids advantages. Taking SiO2-Y2O3-Al2O3 as sintering aids, at 1500 ℃ can porous silicon carbide ceramics with good properties was prepared. When the content of SiO2-Y2O3-Al2O3 is 20%, the preparation of porous SiC ceramics prepared with mechanical properties of high porosity and excellent, the open porosity is 23.73%, hardness and bending strength is 62 and 15.47MPa respectively, at the same time, its uniform pore distribution.
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字典
Keywords SiC porous ceramic
目录
1 引言 1
1.1 研究背景
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