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| 題 名 | 以非晶質二氧化矽披覆氧化鋁粉末製備富鋁紅柱石複合陶瓷=Preparation of Mullite Composites Using Alumina Powders with Amorphous Silica Coatings |
|---|---|
| 作 者 | 陳智成; 顏富士; 廖德潭; 朱清俊; | 書刊名 | 材料科學 |
| 卷 期 | 29:3 1997.09[民86.09] |
| 頁 次 | 頁207-213 |
| 分類號 | 440.34 |
| 關鍵詞 | 富鋁紅柱石; 氧化鋁; 非晶質二氧化矽; 黏性流; Mullite; Alumina; Amorphous silica; Viscous flow; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 富鋁紅柱石是耐火材料的主要原料之一,但也是一種很難燒結的氧化物。本研 究採用溶膠一凝膠法製造富鋁紅柱石複合材料,以非晶質二氧化矽( SiO □)披覆於氧化 鋁( Al □ O □)粉末外層的方式製備 Al □ O □— SiO □複合粉末,並探討此粉末之 性質與燒結行為的關係。結果發現,非晶質 SiO □在 pH=12.6 的水解條件下,可均勻披覆 於 Al □ O □粉末外層,此層非晶質 SiO □在 1300 ℃左右會產生黏性流,促使 Al □ O □粉粒再排列而緻密化。唯非晶質 SiO □的添加量必須大於 13wt%,才能產生足夠的黏性 流來帶動 Al □ O □粉粒的再排列,少量添加 SiO □反而會抑制氧化鋁的燒結。S O □於 1500 ℃以上會與 Al □ O □反應生成富鋁紅柱石,並使黏性流動的緻密化速率急劇減緩。 |
| 英文摘要 | Mullite is an important material for ceramic industry. However, mullite exhibits relatively poor sintering properties, which originate from low diffusion coefficient of mullite. In this study, mullite composites were prepared by sol-gel method, alumina powders were coated with amorphous silica, sintering behaviors were discussed from the viewpoints of powder characteristics of the composites. It was found that alumina particles could be homogeneously coated with amorphous silica at pH=12.6 hydroly is condition. The viscous flow of amorphous silica occurred at 1300 ℃, which could improve the densification of alumina matrix, because the viscous flow enhanced the rearrangement of alumina particles. The amount of viscous flow was important for the densification of alumina matrix. The amount of silica coatings must be more than 13 wt%, which could explicitly improve the densification of alumina matrix. On the contrary, inadequate amount of silica coatings resisted the densification of alumina matrix. Mull ite formed as silica coatings react with alumina at about 1500 ℃. The densification of the composites was resisted after mullite forming. |
本系統中英文摘要資訊取自各篇刊載內容。