耐火材料 ›› 2022, Vol. 56 ›› Issue (5): 396-399.DOI: 10.3969/j.issn.1001-1935.2022.05.006

• 研究开发 • 上一篇    下一篇

Al2O3、SiO2质量比对Al2O3-SiO2-MgO复合粉体电绝缘性能的影响

曹济源1), 马北越1), 王露露2), 李广明3), 刘永利3), 宋娜3), 田剑3)   

  1. 1)东北大学 冶金学院 辽宁沈阳 110819
    2)东北大学 材料科学与工程学院 辽宁沈阳 110819
    3)大石桥市美尔镁制品有限公司 辽宁营口 115199
  • 收稿日期:2022-01-14 出版日期:2022-10-15 发布日期:2022-11-07
  • 作者简介:曹济源:男,1997年生,硕士研究生。E-mail:32471883@qq.com
  • 基金资助:
    国家自然科学基金资助项目(U21A2057)。

Effect of Al2O3/SiO2 mass ratio on electrical insulation performance of Al2O3-SiO2-MgO composite powder

Cao Jiyuan, Ma Beiyue, Wang Lulu, Li Guangming, Liu Yongli, Song Na, Tian Jian   

  1. School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China
  • Received:2022-01-14 Online:2022-10-15 Published:2022-11-07

摘要: 为改善电热管用MgO材料的绝缘性能,先采用KH-550有机改性剂制得Al2O3、SiO2质量比不同的改性Al2O3-SiO2复合粉体,再将改性的复合粉与MgO粉按1∶10的质量比混合均匀得到Al2O3-SiO2-MgO复合粉体。研究了Al2O3-SiO2复合粉的性能和Al2O3-SiO2-MgO复合粉体的电绝缘性能。结果表明:有机改性后的SiO2、Al2O3粉体表面有偶联剂接枝,颗粒间团聚现象得到改善。当Al2O3、SiO2质量比为1∶4时,Al2O3-SiO2复合粉体的振实密度为0.90 g·cm-3,活化指数为40.9%,分散性和流动性最优;Al2O3-SiO2-MgO复合粉体的泄漏电流为0.33 mA,电绝缘性最好。

关键词: MgO材料, Al2O3-SiO2复合粉, 表面改性, 电绝缘性能, 分散性

Abstract: In order to improve the insulation performance of MgO materials for electric heating tubes,modified Al2O3-SiO2 composite powders with different mass ratios of Al2O3/SiO2 were prepared by KH-550 organic modifier,and then the modified composite powder and MgO powder were mixed evenly according to the mass ratio of 1∶10 to obtain Al2O3-SiO2-MgO composite powder.The properties of the Al2O3-SiO2 composite powder and the electrical insulation properties of the Al2O3-SiO2-MgO composite powder were studied.The results show that:the surface of organically modified SiO2 and Al2O3 powders is grafted with coupling agent,and the agglomeration between particles is improved;when m(Al2O3)∶m(SiO2)=1∶4,the tap density of the Al2O3-SiO2 composite powder is 0.90 g·cm-3,the activation index is 40.9%,and the dispersion and fluidity are the best;the leakage current of the Al2O3-SiO2-MgO powder is 0.33 mA,and the electrical insulation performance is the best.

Key words: magnesia material, alumina-silica composite powder, surface modification, electrical insulation performance, dispersibility

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