Novel processing approach to polymer-derived ceramic matrix composites

作者：King Derek; Apostolov Zlatomir; Key Thomas; Carney Carmen; Cinibulk Michael

来源：International Journal of Applied Ceramic Technology, 2018, 15(2): 399-408.

DOI：10.1111/ijac.12805

<jats:title>Abstract</jats:title><jats:p>The rheological properties of commercially available polycarbosilane, <jats:styled-content style="fixed-case">SMP</jats:styled-content>‐10, were analyzed as a function of temperature, to guide development of thermal treatment processes for the improved yield and functionality of polymer ceramic precursors. The curing onset temperature for <jats:styled-content style="fixed-case">SMP</jats:styled-content>‐10 was determined to be as low as 100°C for a heating rate of 1°C/min enabling a heat treatment process at 90°C, where low molecular weight oligomers volatilize from the liquid precursor prior to curing. By driving off the low molecular weight oligomers before fabrication of a composite, the mass yield of <jats:styled-content style="fixed-case">SMP</jats:styled-content>‐10, from a room temperature liquid state was increased from 77% to 83%. The development of B‐staging processes, or a semicure of <jats:styled-content style="fixed-case">SMP</jats:styled-content>‐10, were also demonstrated. B‐staging processes were then applied to polymer infiltration and pyrolysis processing and compared with traditional wet layup <jats:styled-content style="fixed-case">CMC</jats:styled-content> processing. It was determined that B‐staging processes did not adversely affect ceramic matrix composite fabrication. B‐staged processing methods were determined to result in less waste, allow ply‐by‐ply control of matrix compositions, and enable time independent processing when compared to traditional wet layup processing methods.</jats:p>

• 出版日期2018-4