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Preparation of SiC porous ceramics by a novel gelcasting method assisted with surface modification

机译:用新型凝胶化方法制备SiC多孔陶瓷,辅助表面改性

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摘要

The SiC porous ceramics were successfully prepared by gelcasting process using Isobam as gelling agent. The pretreatment and surface modification of SiC was proposed to solve the problem that Isobam is difficult to crosslink and gelling with non-oxide ceramics. The SiC powder was firstly pre-oxidized, and then modified with a silane coupling agent to obtain a functional end group -NH2 on the surface, so that it can be crosslinked with Isobam to obtain a green body with uniform structure. With low amount of organic matter, no additional de-binding procedure was required before sintering. The suitable oxide thickness was investigated, which shows a linear relationship with the original SiC particle size. Moreover, the solid content of the slurry was adjustable between 40 vol% and 52 vol%, and the porosity of the products varied between 50% and 60% after sintering.
机译:通过使用Isobam作为胶凝剂,通过凝胶化方法成功制备SiC多孔陶瓷。 提出了SiC的预处理和表面改性,以解决ISOBAM难以交联和用非氧化物陶瓷胶凝的问题。 首先预氧化SiC粉末,然后用硅烷偶联剂改性,得到表面上的官能端基-NH 2,使其可以与ISOBAM交联,得到具有均匀结构的生坯。 含有少量有机物,在烧结之前不需要额外的去结合程序。 研究了合适的氧化物厚度,其显示出与原始SiC粒度的线性关系。 此外,浆料的固体含量可调节40体积%和52体积%,并且产物的孔隙率在烧结后的50%和60%之间变化。

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