Development of <TEX>$Al_2TiO_5$</TEX>-Clay Composites for Infrared Radiator

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J. Korean Ceram. Soc. > Volume 37(2); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(2): 122.

$Al_2TiO_5$-점토 복합체를 이용한 적외선 방사체의 개발

신대용, 한상목¹

강원대학교 석재복합 신소재제품 연구센터
¹강원대학교 공과대학 신소재공학과

Development of $Al_2TiO_5$-Clay Composites for Infrared Radiator

ABSTRACT

The thermal expansion, thermal stability, mechanical strength and infrared radiative property of Al2TiO5-clay composites, prepared from synthesized Al2TiO5 and clay, were investigated to develop a material for far infrared radiators. The emittance of composites containing 10~50 wt% clay, heated at 1,20$0^{circ}C$ for 3 h, increased with increasing clay content and emittance was about 0.3 and 0.92 in the ranges of 3,400~2,500 cm-1 and 2,500~400cm-1, respectively. The bulk density and bending strength of the Al2TiO5-clay composites increased with increasing clay content. 50 wt% Al2TiO5-50 wt% clay composite, heat-treated at 1,20$0^{circ}C$, had an adequate strength for infrared radiators; 80 MPa. The degree of thermal expansion hysteresis decreased with increasing clay content and the mean thermal expansion coefficient increased with increasing clay content. The thermal expansion coefficient of 50 wt% Al2TiO5-50 wt% clay composite heated at 1,20$0^{circ}C$ was 5.78$times$10-6/$^{circ}C$.

Key words: $Al_2TiO_5$-clay composites, Infrared radiators, Emittance, Radiation energy, Thermal expansion coefficient