文档介绍：烧结工艺和粘结剂对SiC网络结构陶瓷性能的影响
摘要
碳化硅泡沫陶瓷具有气孔率高、热稳定性好等优良性能,被广泛用作金属溶液过滤器、高温气体和离子交换过滤器、,阐述了碳化硅泡沫陶瓷的制备方法和影响碳化硅泡沫陶瓷产品性能的因素,展望了碳化硅泡沫陶瓷的发展前景.
本文主要阐述了SiC基泡沫陶瓷的结构、性能、制造工艺和应用前景。使用了有机前驱体浸渍法制备SiC基泡沫陶瓷,通过比较在不同条件下(不同粘结剂含量和烧成温度保温时间)试样的常温耐压强度、热震稳定性、容重和孔隙率等性能参数,并用扫描电镜(SEM)对泡沫陶瓷显微结构进行了形貌分析,系统的分析实验条件对试样的影响。
实验结果表明:SiC基泡沫陶瓷在1450℃时的烧结保温3小时比保温2小时和4小时的热震次数多和抗压强度高;粘结剂的加入能够有效提高坯体的挂浆效果,较高温度烧结会导致烧结体产生大量玻璃相,降低其耐火度和高温强度,但是不利于SiC基泡沫陶瓷的综合性能参数。在1450°C保温3个小时粘结剂加入量为8%,900℃加热、20℃水急冷其热震次数高达16次。烧结温度为1450℃时制备的SiC基泡沫陶瓷过滤器具有较好的综合性能。
关键词:泡沫陶瓷,SiC,粘结剂,保温时间,抗热震性,抗压强度,
Sintering Process and Binder on the
sic-based Foam Ceramics
Abstract
Silicon carbide foam ceramic with good performance such as high porosity,excellent thermal stability,it is widely used as solution of metal filters,high-temperature gases and ion exchange filters,catalyst support, and so on. The type of silicon carbide foam ceramic are focused in this article, the preparation methods of silicon carbide foam ceramic and factors that affect the performance of silicon carbide foam ceramic product are introduced,and the silicon carbide foam cera-mic's prospects are expected.
This paper describes the structure of SiC-based ceramic foam, performance, manufacturing processes and applications. Organic precursor used in impregnation SiC-based ceramic foam, paring the different conditions (different binder content and sintered at different temperatures) samples at room pressive strength, thermal shock stability, bulk density and porosity and other performance parameters And by scanning electron microscopy (SEM) on the microstructure of the ceramic foam morphology, systematic analysis of the impact of experimental conditions on the sample.
Experimental results show that: SiC-based ceramic foam sintered at 1450℃ and heat preservation time was 3h is better than heat preservation time was 2h and 4h than sintering thermal shock and pressive strength more often; binder added to improve green body hanging plas