Densification Behaviour and Strengthening of Mullite/Ziroconia Composite with Addition of <TEX>$ZrO_2$</TEX> or <TEX>$ZrSiO_4$</TEX>

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J. Korean Ceram. Soc. > Volume 36(10); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(10): 1080.

$ZrO_2$ 및 $ZrSiO_4$ 첨가에 따른 Mullite/Zirconia 복합체의 치밀화 거동 및 강도 증진

김인섭, 이승석¹, 박주석¹, 이경희¹, 이병하¹

요업기술원 제품과
¹명지대학교 무기재료공학과

Densification Behaviour and Strengthening of Mullite/Ziroconia Composite with Addition of $ZrO_2$ or $ZrSiO_4$

ABSTRACT

Mullite/zirconia composite was synthesized by adding zirconia and Zircon to mixture of Hapcheon kaolin(grade pink A) and aluminium nitrate salt in order to enhance strength of the mullite specimens. Kaolin and aluminium nitrate salt was mixed milled and calcined at 100$0^{circ}C$ and then 5wt% mullite seed was added to increase mullite content. The influence of the additives(ZrO2 and ZrSiO4) and sintering temperature on the strength of the sintered specimens was investigated. The flexural strength of the specimens containing 10wt% zirconia was enhanced from 150MPa without the additive up to 300MPa after heat treatment at 156$0^{circ}C$ In the case of addition of 15wt% zircon the strength of the specimens systhesized at 1$600^{circ}C$ was 225 MPa.

Key words: Mullite/Zirconia composite, Strengthening, Mullite-seed, Kaolin