Synthesis of a powder precursor in the form of hydroxyhydrogel for reaction sintering of BN–mullite composite

• Published in: Ceramics international Vol. 32; no. 2; pp. 213 - 219
• Main Authors: Basu, A.K., Mitra, A., Ghatak, S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 2006; Elsevier Science
• Subjects: Applied sciences; Boron nitride–mullite composite; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Chemistry; Colloidal state and disperse state; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; General and physical chemistry; Hydroxy hydrogel intermediate; Materials science; Miscellaneous; Other materials; Physics; Powders; Specific materials; Technical ceramics; Boron nitride–mullite composite; Hydroxy hydrogel intermediate; Ceramic matrix composite; Scanning electron microscopy; Thermogravimetry; Boron nitride; Differential thermal analysis; Experimental study; Precursor; Composite material; Powder; Non oxide ceramics; Reaction sintering; Aluminium silicate; Chemical preparation; Technical ceramics; Mullite; Manufacturing; Hydrogel; Fourier-transformed infrared spectrometry
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2005.02.003

A powder precursor in the form of hydroxyhydrogel was prepared for the reaction sintering in the h-BN–mullite composite system. The powder precursor contains all the essential elements for the formation of the composite. Characterization of the powder precursor indicated the presence of Al 3+ in predominantly hexacoordinated state. The powder precursor yielded consolidated BN–mullite composite formed during heat treatment of pressed compact in ambient gas atmosphere.