Formation of Material Prescribed Phase Composition from Refractory Filler Silica Powder Modified with Alkoxide and Sol-Gel Composite

• Published in: Refractories and industrial ceramics 2014-09, Vol.55 (3), p.240-243
• Main Authors: Semchenko, G. D., Shuteeva, I. Yu, Ryshchenko, M. I., Borisenko, O. N.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Ceramic materials; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Crystals; Glass; International economic relations; Materials Science; Natural Materials; Powders; Refractories industry; Silica; Structure
• ISSN: 1083-4877; 1573-9139
• DOI: 10.1007/s11148-014-9697-9

Creation of ceramics and refractories with improved physicomechanical properties is possible with use of nanomaterials in their technology. Introduction of SiC nanoparticles into a ceramic material charge by using modified filler powders is proposed. Fillers modified with tetraethoxysilane during grinding leads to powder crystal structure breakdown and SiC mechanochemical synthesis. The amount of β-SiC synthesized in this way depends on the amount of modifying additive. Results are provided for modified filler phase composition before and after heat treatment at 1000°C, and mechanochemically synthesized SiC thermal stability is established. It is shown that sintering of modified electro-corundum worsens with an increase in amount of synthesized silicon carbide nanoparticles. The difference is demonstrated in phase composition formation with heat treatment of a mixture of modified and normal finely ground electrocorundum with a sol-gel binder and firing up to 1600°C. Silicon carbide nanoparticle synthesis does not exceed 3 – 7 % in both cases. Recommendations are given for use of corundum filler with a different amount of modifying additive.