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題 名 | CaF[feaf]對Al[feaf]O[feb0]陶瓷微結構之影響=Effect of CaF[feaf]on Microstructure of Al[feaf]O[feb0]Ceramics |
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作 者 | 童國峰; 黃啟祥; | 書刊名 | 陶業學刊 |
卷 期 | 1:2 1997.07[民86.07] |
頁 次 | 頁9-15 |
分類號 | 440.33 |
關鍵詞 | 氧化鋁; 氟化鈣; 微結構; 柱狀晶; Alumina; Calcium fluoride; Microstructure; Elongated grain; |
語 文 | 中文(Chinese) |
中文摘要 | 微結構的變化對於陶瓷結構的諸性質有很大的影響。本研究是以氧化鋁為基材,以 氟化鈣為添加劑,探討 CaF �窈L量添加於 Al �� O �偺誑膜允黈韙ずT陶瓷燒結及微結構的 影響。 實驗結果顯示:Al �� O �陛� CaF �租V合粉末成形體於空氣中燒結時,CaF �索�料 會阻礙對 Al �茨� O �婪陌誑蔽漯黕講N結,但經 1500 ℃燒結 2 hrs 後,CaF �茨洹t量在 0.5wt% 以下的試樣會有明顯促進燒結收縮的效果。Al �� O �陛� CaF �紊N結體中所含的結 晶相僅為α - Al �� O �偵P CaO.6Al �� O �婪迭C CaF �洩熔K加會導致燒結體中部份 Al �� O �婪降穨鰲僕伝� [1120] 方向成長為柱狀;且柱狀晶粒的含量隨著 CaF �租K加量的增 加而增加。 此外,Al �� O �陛� CaF �紊N結體中反應生成之 CaO.6Al �� O �健|產生體積 的膨脹,而於冷卻過程中, 會因 CaO.6Al �� O �偵Pα - Al �� O �婪迨尬鶹接�係數之不 同,而導致局部應力的產生,因而造成晶粒內差排的滑移並堆積於次晶界處。 |
英文摘要 | In this study, Al�烙�軒nd CaF�畝re selected as the matrix and additive, respectively. The effect of CaF �茨� on microstructive of Al �� O �� ceramics are investigated. Results indicated that the Al �� O �婪迭� CaF �� composites sintered at 1500 ℃ /2hrs in air contained two phases of Al �� O �� iand CaO.6Al O ��. The presence of CaF �� in Al �� O �� slowed remarkabl the densification during sintering, but in the final stage of sintering the amount of CaF �� less than 0.5wt% showed a positive effect on densification. However, it was believed that the presence of CaF �� in the starting powder plays decisive role for triggering abnormal grain growth of Al �� O �� to develop the elongated grains toward the [1120] direction. Since the thermal expansion coefficient between CaO.6Al �� O �� and Al �� O �� are different, significant stresses could arise in Al �� O �陛� CaF �� composities. If the CaO6.Al �� O �� forms only locally the growth stresses would arise that needed to be accommodared by dislocation glide. Then the dislocation would pile-up at subgrain boundaries. |
本系統中英文摘要資訊取自各篇刊載內容。