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研究生:林俊宏
研究生(外文):Chun-hung Lin
論文名稱:Si4+:Cr2O3之雷射剝蝕凝聚及Cr2O3-Y3Al5O12反應燒結
論文名稱(外文):Laser ablation condensation of Si4+:Cr2O3 and reactive sintering of Cr2O3-Y3Al5O12
指導教授:沈博彥沈博彥引用關係
學位類別:碩士
校院名稱:國立中山大學
系所名稱:材料科學研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:117
中文關鍵詞:Y3Al5O12Cr2O3反應燒結雷射剝蝕凝聚
外文關鍵詞:Laser ablation condensationsinteringCr2O3-Y3Al5O12Si4+:Cr2O3
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本文分成兩部份,第一部份利用雷射剝蝕靶材,靶材形式為鉻靶在前,矽靶在後,進行含矽氧化鉻Si4+:Cr2O3之凝聚,第二部份利用Y3Al5O12石榴子石(簡稱YAG)和Cr2O3進行反應燒結實驗,經由X-ray繞射儀、電子顯微鏡進行研究分析。
姬俊宇學長之研究發現Cr:YAG晶體光纖外層,有Cr3O4凝固偏析出現(Ji et al.,2005)。而Cr:YAG晶體光纖包裹SiO2纖衣,可因相互擴散造成尖晶石結構γ-(Cr-Al)2O3奈米顆粒,分佈於非晶質擴散層中(Lin et al.,2006)。
本文第一部份,進一步研究含鉻氧化物是否也可於晶纖拉提或包裹SiO2纖衣拉提過程中因氣態凝聚產生,結果發現在含Si環境下,可於雷射氣化靶材後,凝聚產生Si4+:α-Cr2O3及少量的Si4+:Cr3O4尖晶石結構,並且發現六角柱之Si4+:α-Cr2O3奈米顆粒傾向以基底面(0001)聚簇並產生差排,以降低界面能及應變能,最中合而為一並不形成聚簇雙晶。而側邊不完美接觸的Si4+:α-Cr2O3亦可依照顆粒之布朗運動調整方位,盡量趨近低能量的平行磊晶關係。
本文第二部分,針對Cr2O3與YAG之相互擴散及相變化,進行1600℃反應燒結實驗,結果發現因為Cr2O3與YAG相互擴散引起相變化,會形成含10 at%Cr之YAG及形成金剛石結構之α-(Cr-Al)2O3,此外,α-(Cr-Al)2O3顆粒可因布朗運動聚簇造成差排。Cr2O3-YAG擴散偶形成的鋼玉含量與成份由擴散途徑及總成份所控制。與雷射提拉Cr-YAG晶纖周圍凝固偏析之純Cr3-δO4及纖衣非晶質擴散層中所形成的尖晶石結構γ-(Cr-Al)2O3截然不同。
第一部分目錄
目錄 i
圖索引 iii
表索引 vii
一、前言 1
二、實驗步驟 6
1、酸洗靶材 6
2、雷射剝蝕 6
3、X光繞射分析 6
4、偏光顯微鏡觀察 6
5、掃瞄式電子顯微鏡(SEM)觀察 7
6、穿透式電子顯微鏡(TEM)觀察 7
三、實驗結果 9
1、X光繞射之觀察 9
2、偏光顯微鏡之觀察 9
3、掃描式電子顯微鏡(SEM)之觀察 10
4、穿透式電子顯微鏡(TEM)之觀察 10
四、討論 14
五、結論 19
六、參考文獻 20
第二部份目錄
目錄 viii
圖索引 x
表索引 xiii
一、前言 50
二、實驗步驟及方法 53
1、配粉 53
2、壓餅 53
3、熱處理 53
4、X光繞射分析 54
5、掃瞄式電子顯微鏡(SEM)觀察 54
6、穿透式電子顯微鏡(TEM)觀察 54
三、實驗結果 56
1、X-ray繞射分析 56
2、掃描式電子顯微鏡(SEM)觀察 57
2-1、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結2小時 57
2-2、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結6小時 57
2-3、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結15小時 57
3、穿透式電子顯微鏡(SEM)之觀察 58
3-1、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結2小時 58
3-2、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結6小時 58
3-3、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結15小時 59
3-3、莫耳比7:3(YAG:Cr2O3)1600℃反應燒結24小時 60
四、討論 61
五、結論 64
六、參考文獻 65
附錄 89
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