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題 名 | The Effects of Sintering Time and Temperature on the Densification and Phase Evolution of Mullite-30 Vol%(3 Mol%Yttria-Zirconia)=燒結時間與溫度對墨來石-30 vol%(3 mol%釔安定二氧化鋯)之緻密化與相變化的影響 |
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作 者 | 林永仁; 張肇家; | 書刊名 | 大同學報 |
卷 期 | 24 1994.11[民83.11] |
頁 次 | 頁133-141 |
分類號 | 440.33 |
關鍵詞 | 燒結時間; 溫度; 墨來石; 釔安定二氧化鋯; 緻密化; 相變化; |
語 文 | 英文(English) |
中文摘要 | 墨來石-30 vol%(3 mol%釔安定二氧化鋯)可由氧化鋁、非晶二氧化矽及 3 mol% 釔安定二氧化鋯混合粉末燒結而成, 燒結後的密度與結晶相取決於燒結溫度及時間 。實驗結果顯示,1400 ℃、2 小時燒結便可使試片完全緻密;當燒結溫度高於 1400 ℃、2 小時燒結便可使試片完全緻密; 當燒結溫度高於 1400 ℃時,燒結時間即使從 2 小時延長 成 8 小時,材料內部的結晶相並不會產生變化; 然而,這種 " 穩定 " 的相組成卻與燒結 溫度有關。XRD 結果顯示,當燒結溫度在 1400 ℃或更低時,試片會產生鋯矽石的新結晶相 。 因此,燒結條件為 1500 ℃、2 小時便可獲得完全緻密的墨來石 / 釔安定二氧化鋯試片 。溫度太低,則產生鋯矽石相;時間太長,則只會造成晶粒成長。 |
英文摘要 | Mullite-30 vol% (3 mol% yttria-zirconia) was synthesized from powder mixtures of alumina, amorphous silica and 3 mol% yttria-zirconia. The densities and phases in the samples depended on the sintering temperatures and soaking time. It was found that the sample would reach its full density after sintering at 1400 ℃ for 2 hours. Also, the phases in the samples did not change as soaking time increased from 2 hours to 8 hours if sintering temperatures were greater than 1400 ℃. However, the "stable" phase constituents of the samples depended on the sintering temperatures. From XRD results. it showed that the formation of "undesirable" zircon could not be avoided if the sintering was performed at 1400 ℃ or less. It therefore concluded that sintering should be performed at 1500 ℃ /2 hours in order to achieve fully dense samples containing only mullite and yttria-zirconia. Lower temperatures would result in zircon formation and longer sintering time would only result in larger grains. |
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