Fluidity of a slurry of the graphite powder coated with Al2O3-based metal oxides

• Published in: Journal of materials science letters Vol. 20; no. 9; pp. 851 - 853
• Main Authors: KAWABATA, K, YOSHIMATSU, H, FUJII, E, HIRAGUSHI, K, OSAKA, A, MIURA, Y
• Format: Journal Article
• Language: English
• Published: Dordrecht Kluwer Academic Publishers 01.05.2001
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Chemical industry and chemicals; Chemistry; Colloidal state and disperse state; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; General and physical chemistry; Materials science; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physics; Refractory products; Special refractories; Specific materials; Viscosity; Aluminium Oxides; Coated powder; Graphite; Particle suspension; Coated material; Powder; Rheological properties
• ISSN: 0261-8028
• DOI: 10.1023/A:1010970931622

Graphite is widely used as a refractory material due to its many excellent properties such as high corrosion resistance and thermal shock resistance. However, because of its poor wettability by water and fluidity, it cannot be used satisfactorily in castable refractories, in which it easily segregates. The effects of Al2O3-based oxide coatings on the fluidity of the slurries of graphite powder were investigated. It is shown that the fluidity of powder coated with Al2O3-ZrO2 and Al2O3-SiO2 is similar to that of Al2O3-coated graphite powder without the dispersing agent. In the case of addition of the dispersing agent, a slurry of the graphite powder coated with Al2O3-SiO2 shows higher fluidity than that of the Al2O3-coated graphite powder. It is concluded that the fluidity of a slurry of the graphite powder depends on the fraction of free water of a slurry and the degree of dispersion of the graphite powder coated with Al2O3-based oxides. 4 refs.