Preparation and characterization of glass-like carbon/silica composites from rice hull and phenolic resin

• Published in: Journal of materials science Vol. 41; no. 17; pp. 5593 - 5597
• Main Authors: UNUMA, Hidero, NIINO, Katsuyuki, SASAKI, Katsuaki, SHIBATA, Yoshihiro, IIZUKA, Hiroshi, SHIKANO, Shujun, NAKAMURA, Tohru
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01-09-2006; Springer Nature B.V
• Subjects: Bend strength; Carbon; Carbonization; Compressive strength; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fracture toughness; Fullerenes and related materials; diamonds, graphite; Glassy carbon; Hulls; Hulls (structures); Materials science; Mechanical properties; Phenolic resins; Physics; Polymer matrix composites; Rice; Silica glass; Silicon dioxide; Specific materials; Characterization; Fabrication; Composite materials; Mechanical properties; Experimental study; Rice by product; Phenolic resin; Carbon; Vitreous state; Precursor; Silica
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-006-0281-7

Glass-like carbon/silica composites were prepared from rice hull and phenolic resin. Monolithic composites were prepared by carbonizing green bodies made from phenolic resin and rice hull in nitrogen atmosphere at temperatures raging from 1173 K to 1773 K. The resultant composites consisted of approximately 70 mass% of glass-like carbon and 30 mass% of silica, the latter being originated from rice hull. The highest compressive strength, bending strength, and fracture toughness were 227 MPa, 50 MPa, and 0.80 MPam1/2, respectively. The composites did not show any detectable hygroscopic expansion upon immersing in water. The mechanical properties were not deteriorated up to 1573 K, as long as the silica maintained its amorphousness.