Sintering Properties of Renewed <TEX>${Al_2}{O_3}$</TEX>Ceramics with Particle Size and Addition Amount of Recycling Powder

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J. Korean Ceram. Soc. > Volume 38(12); 2001 > Article

Journal of the Korean Ceramic Society 2001;38(12): 1123.

재활용원료의 첨가량과 입경에 따른 재생 ${Al_2}{O_3}$ 세라믹스의 소결 특성

신대용, 한상목¹, 김경남²

강원대학교 석재복합 신소재제품 연구센터
¹강원대학교 신소재공학과
²삼척대학교 신소재공학과

Sintering Properties of Renewed ${Al_2}{O_3}$Ceramics with Particle Size and Addition Amount of Recycling Powder

ABSTRACT

The sintering behaviors of the renewed $Al_2$O$_3$ceramics were investigated as functions of the addition amount and particle size of recycling $Al_2$O$_3$powder, such as crushed powder of structural $Al_2$O$_3$ceramics and waste $Al_2$O$_3$adsorbent, were investigated. Pure $Al_2$O$_3$sample was fabricated by sintered at 1,$650^{circ}C$ for 5h and it was crushed into powder (-40${mu}{textrm}{m}$and +40${mu}{textrm}{m}$ in particle size) by thermal shock treatment and crushing. Then, 10~50wt% of crushed $Al_2$O$_3$powder and waste $Al_2$O$_3$adsorbent were mixed with pure $Al_2$O$_3$powder and were subjected to re-sintering to renewed $Al_2$O$_3$sample. The density and the 3-point bending strength increased with increasing the sintering temperature without regard to the addition amount and particle size of recycling $Al_2$O$_3$powder, and that of the samples at the same sintering temperature decreased with increasing the addition amount and particle size of recycling $Al_2$O$_3$powder. Samples over 200 Mpa of 3-point bending strength were obtained by mixing ~30wt% of crushed $Al_2$O$_3$powder(-40${mu}{textrm}{m}$), ~20wt% of crushed $Al_2$O$_3$powder (+40${mu}{textrm}{m}$) and 10wt% of waste $Al_2$O$_3$adsorbent. 5~20wt% of waste glass powder containing renewed $Al_2$O$_3$samples for densification were fabricated by sintered at 1200~1$650^{circ}C$ for 5h. The temperature of maximum density and 3-point bending strength decreased with increasing the addition amount of waste glass powder, however, these samples at above 140$0^{circ}C$ showed lower density and bending strength than renewed $Al_2$O$_3$samples. The addition of waste glass powder did not improved the densification of renewed $Al_2$O$_3$sample.

Key words: Renewed ${Al_2}{O_3}$ceramics, Recycling ${Al_2}{O_3}$powder, ${Al_2}{O_3}$adsorbent, Waste glass powder, Sintering