Densification of a SiC-matrix by electrophoretic deposition and polymer infiltration and pyrolysis process

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• 作者：Alja&#x17e ; Iveković ; ^a ; Goran Dra&#x17e ; ić ; ^a ; Saš ; a Novak ; ^a ; ^{sasa.novak@ijs.si}
• 关键词：Precursors-organic ; Porosity ; Thermal conductivity ; SiC ; Fusion ; Structural application
• 刊名：Journal of the European Ceramic Society
• 出版年：2011
• 出版时间：May 2011
• 年：2011
• 卷：31
• 期：5
• 页码：833-840
• 全文大小：813 K

文摘

With the aim to improve the properties of the SiC-matrix in a SiC_f/SiC composite for fusion applications, a new fabrication technique combining electrophoretic deposition (EPD) and polymer infiltration and pyrolysis (PIP) was introduced. By using EPD from a well-dispersed, aqueous suspension we were able to produce SiC green bodies with closely packed particles (>62 % TD). This deposition was followed by vacuum infiltration of the green body with pre-ceramic polymer precursor and then pyrolysis and crystallization at 1600 °C. Due to the high initial packing density of the deposits, only a few polymer-infiltration and pyrolysis steps were needed to achieve a relatively high density of the material. The SiC samples fabricated by the combined EPD-PIP process reached the matrix density of 86.5 % TD and average pore size of 90 nm after six consecutive PIP cycles, while high thermal conductivity values (>30 W/mK) were obtained already after one PIP cycle.