Novel Cr₂AlC MAX-phase/SiC fiber composites: Synthesis, processing and tribological response

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• 作者：J. Gonzalez-Julian^a ; ^{j.gonzalez@fz-juelich.de" class="auth_mail" title="E-mail the corresponding author} ; J. Llorente^b ; M. Bram^a ; M. Belmonte^b ; O. Guillon^a
• 关键词：MAX phases ; Cr2AlC ; Ceramic matrix composites ; SiC fiber ; Wear
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：467-475
• 全文大小：3042 K

文摘

A new class of ceramic matrix composites based on Cr₂AlC MAX-phase containing 5 and 10 wt.% of SiC fibers was developed in this investigation. The Cr₂AlC/SiC composites were performed through two consecutives steps: i) synthesis of the pure Cr₂AlC phase from its elemental constituents by reactive method under argon atmosphere at 1400 °C and particle size refinement, and ii) processing of Cr₂AlC powder and SiC fibers followed by densification using the field assisted sintering technology/spark plasma sintering. Cr₂AlC/SiC composites presented high density (98.6%) with an excellent dispersion of the fibers within the matrix and a strong matrix/fiber interfase. Tribological behavior of the developed composites was studied under dry conditions to reveal the role played by the SiC fibers. Incorporation of the SiC fibers within the Cr₂AlC matrix reduced the friction coefficient up to 20% for low testing loads, while the wear resistance increased up to 70–80% independently of the applied load.