| 알칼리 토속 산화물이 물라이트 자기의 전기적 특성에 미치는 영향 |
| 주기태, 장성도 |
| 한국과학기술원 요업재료 연구실 |
| Effect of the Variation in Alkaline-Earth Oxides (RO) Content on Electrical Properties of $RO-Al_2O_3-SiO_2$ Porcelain System |
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| ABSTRACT |
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Alkaline-earth porcelains have been prepared from mixture of kaolin, quartz, and synthetic calcines obtained by calcining a mixture of kaolin and more than two different kinds of alkaline-earth carbonates. They were magnesium, calcium and barium carbonates which are inexpensive and readily available. The vitrification behavior of the batch mixes was investigated in the firing range of 1240$^{circ}$to 1380$^{circ}$, in relation to the body compositions. It appeared that the density and the firing temperature depended largely on the content of alkaline-earth oxides in the body. These porcelains posses excellant dielectric properties, and are especially valuable as bases for deposited carbon resistors for which they were developed. An illustrative composition is 50% Dong Hwa kaolin, 22.4% Chang Shin quartz, 27.6% calcine. The composition of the calcine is 70% Dong Hwa kaolin, 10.7% BaCO3, 13.5% CaCO3, 5.8% MgCO3. The specific resistance of this body is $1.2{times}10^{15}$ ohm-cm at 5$0^{circ}C$, $2.5{times}10^{14}$ ohm-cm 10$0^{circ}C$, $2.5{times}10^{13}$ ohm-cm at 15$0^{circ}C$, $1.8{times}10^{12}$ohm-cm at 20$0^{circ}C$. |
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