A novel technique for fabrication of near-net-shape CMCs

Bulletin of materials science

M Chatterjee³  A Dey³  S Dalui¹  K Basu²  M K Naskar³ 

[1] Composite Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India$$Composite Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, IndiaComposite Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India$$;Regional Research Laboratory, Bhopal 462 026, India$$Regional Research Laboratory, Bhopal 462 026, IndiaRegional Research Laboratory, Bhopal 462 026, India$$;Sol-Gel Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India$$Sol-Gel Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, IndiaSol-Gel Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India$$

关键词: Solâ€�?�gel;    vacuum infiltration;    fibre reinforced ceramic matrix composites.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A solâ€�?�gel vacuum infiltration technique has been developed for the fabrication of near-net-shape ceramic matrix composites (CMCs) using discontinuous mullite fibre preform with 15 vol.% of fibre content and ZrO₂.10 wt.% Y₂O₃ sol as the infiltrant. Effect of sol viscosity, number of infiltration and calcination temperature on physico-mechanical properties of fabricated CMCs were examined. Characterization of the fibre preform, matrix material (in the form of ceramic specimen without fibre) and the developed CMCs were performed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD indicated the presence of cubic (ð‘�?) and tetragonal (ð‘�?) zirconia in both the CMCs and the ceramic specimens calcined even at 1400°C. Flexural strength of the CMCs and the ceramic specimens (calcined at 1400°C), determined by the three-point bending test, was found to be about 14 mPa and 1.40 mPa, respectively. SEM indicated multiple fracture of the matrix which gave rise to pseudo elasticity. This is also evident from the load-displacement curve of the three-point bend test. SEM studies also indicated fibre pull-out in the fracture surface of the CMCs.

【 授权许可】

Unknown