在熔融石英粉中分别添加质量分数为0.5％、1.5％、2.5％、3.5％的B4C或者6％、9％的B2O3,所得生坯分别经1 150℃4 h、1 200℃4 h和1 350℃0.5h热处理后,检测熔融石英陶瓷的体积密度、显气孔率、常温抗折强度和热膨胀系数,并分析其相组成和显微结构.结果表明:1)添加B4C可促进熔融石英陶瓷的烧结,但随B4C的增多,易形成较多的闭口气孔；2)添加3.5％(ω)B4C的试样在40～ 730℃的平均热膨胀系数最小,为1.045×10-6℃-1；3)添加B4C可有效抑制熔融石英陶瓷的析晶,且添加B4C的效果优于添加具有相同硼含量的B2O3.
参考文献
| [1] | 杨德安;沈继耀;朱海强 .加入物对石英陶瓷烧结和析晶的影响[J].耐火材料,1994,28(04):201-203. |
| [2] | 王金波,李凯,黄世俊,肖建中,夏风.硼酸对熔融石英烧结及其晶化的影响[J].硅酸盐通报,2009(06):1107-1111. |
| [3] | 刘恒波,蒋述兴,贾韶辉.SiO2/BN复相陶瓷的制备及其机理化研究[J].矿冶工程,2008(06):104-105,108. |
| [4] | 李友胜,韩志强,李楠.外加剂对熔融石英陶瓷烧结性能的影响[J].耐火材料,2004(05):334-335,346. |
| [5] | Falamaki C;Shafiee M;Aghaic A .Initial sintering stage pore growth mechanism applied to the manufacture of ceramic membrane supports[J].Journal of the European Ceramic Society,2004,24(08):2285-2292. |
| [6] | Wagstaff F E .Crystallization kinetics of internally nucleated vitreous silica[J].Journal of the American Ceramic Society,1968,51(08):449-452. |
| [7] | Thomas R.;Webster J.D. .Melt inclusions in pegmatite quartz: complete miscibility between silicate melts and hydrous fluids at low pressure[J].Contributions to Mineralogy and Petrology,2000(4):394-401. |
| [8] | Ivanl Fanderlik.Silica glass and its application[M].Amsterdam:Elsevier Science,1991:120. |
| [9] | David K M .An infrared spectroscopic study of water-related species in silica glasses[J].Journal of Non-Crystalline Solids,1996,201(03):177-198. |
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