A Study on the Forsterite Porcelain as a High Frequency Insulator (I) (Crystalline and Glassy Phases of Forsterite)

고주파용 절연재료로서의 Forsterite 자기에 관한 연구 (I) (Forsterite의 결정질과 유리상)

  • 이웅상 (한양대학 무기재료 공학과) ;
  • 황성연 (한양대학 무기재료 공학과)
  • Published : 1981.01.01

Abstract

This study is to investigate the effective mineralizer in the manufacture of forsterite porcelain as a high frequency insulator. A mixture of $Mg(OH)_2$. and $SiO_2$.($\alpha$-Quartz) corresponding to the molar ratio of 2.0 MgO: 1.0 $SiO_2$ was prepared from the materials of high purity. It was heated to 140$0^{\circ}C$ at the rate of 20$0^{\circ}C$/hr, which was kept constantly for 1 hour, and one has made chamotte after cooling. Six kinds of glasses were prepared by an 0.1 atomic equivalent of K ions substitution-Ba, Bi, Zn, Cd, Zr-to the basic K-glass (0.333 $K_2O$.1.14 $SiO_2$) and were melted approximately at 150$0^{\circ}C$. The forsterite bodies were provided by adding each glass (10, 15, 20, 25, 30%) to the forsterite chamotte, which was fired at 1320, 1360, 1400, 144$0^{\circ}C$. (1 hr). One has examined the physical and dielectric properties for the specimens. The results of the experiments are as follows; 1. As for water absorption: Bodies were better vitrified with an addition and temperature change of Ba, Bi, Zn-glasses. The specimen containing Cd-glass showed deviation of slow decreasing, where as K-glass was completely not vitrified. 2. Bodies containing Ba, Zn, Bi-glasses appeared comparatively high Modulus of Rupture at 136$0^{\circ}C$, while containing Zr-glass had the highest Modulus of Rupture as the addition changes remarkably at 140$0^{\circ}C$. 3. It was estimated that 20-25% glass present in a forsterite bodies were in good conditions as for physical properties. 4. Specimens of Ba, Bi, Zr-glasses were superior as for dielectric properties, where among Ba-glass was most excellent. 5. Dielectric constant commonly increases in a slight gradient as firing temperature rises. 6. The petrographic examination showed that the bodies containing Ba, Bi-glasses had fine crystals, and were observed distinctly large mosaic crystals in the Zn-glass.

Keywords

References

  1. 高周波絶緣材料としてのフォルステラィト磁器 v.66 no.10 杉浦正敏
  2. ファイソセラミックス 素木洋一
  3. J. Am. Cer. Soc. v.37 no.8 Advances in Ceramics Related to Electronic Tube Developments Louis;Navias
  4. フォルステライト磁器の諸性質に及ぱすカオりソの影響 v.71 no.12 佐野資郞;石井英一;平井道雄;杉浦正敏
  5. セラミック外論 v.1 no.7 素木洋一
  6. Ceram. Age. v.60 no.6 Recent development in ceramic dielectrics E. J. Smoke;J. H. Koenig
  7. Influence of Excess Magnesia on the Properties of Forsterite Porcelain v.70 no.3 杉浦正敏;佐野資郞;石井英一;平井道雄
  8. フォルステラィト磁器中の過剩珪酸分の影響 v.67 no.10 杉浦正敏;平井道雄;石井英一;佐野資郞
  9. J. Am. Cer. Soc. v.27 no.2 Crystalline and Glassy Phases of Steatite Dielectrics Herbert;F. G. Ueltz
  10. 名工試報告 v.9 no.9 高周波用絶緣材料としてのホルステラィト磁器(ジルコソ添加の影響) 佐野資郞;杉浦正敏;石井英一;平井道雄
  11. 博士學位論文 Forsterite에 添加하는 酸化物이 電氣的特性에 미치는 影響 朴順子
  12. 名工試報告 v.6 no.11 高周波用絶緣材料としてのホルステラィト磁器 杉浦正敏;平井道雄;石井英一;佐野資郞
  13. セラミック誘電體工學 罔峙淸