臺灣博碩士論文加值系統

本研究藉由添加微量的鈀（Pd）來探究其對Fe-Si-B非晶合晶之玻璃形成能力及軟磁性質之影響。(Fe75Si10B15)100-xPdx (x = 0，0.5，1，2 at%)母合金的之製備在真空電弧熔煉爐在氬氣氛下進行，接著以單輥熔射旋淬法製備出薄帶。
結果顯示: (Fe75Si10B15)100-xPdx合金薄帶經以XRD及SEM分析與觀察，0 at%Pd及0.5 at%Pd之薄帶產生些微結晶之現象。當Pd添加在1 at%與2 at%Pd的薄帶皆呈現非晶質結構。 從DSC熱分析當Fe-Si-B非晶合金添加Pd後具有Tg的特徵溫度，而以添加1 at%Pd具有最佳之GFA(glass forming ability)，所得Tg為767.8K與Tx為841.3 K。最後，藉由Kissinger plot 獲得1 at%Pd具有最高之晶化能達447.95 kJ/mol，意旨有高的熱穩定性。磁性的量測顯示，1 at%Pd與2 at%Pd之Ms分別為1.28、1.30 T，而Hc則為33.0、30.8 A/m。而Fe-Si-B非晶質薄帶具有最高Ms為1.52 T，但Fe-Si-B非晶質基底具微晶的存在，以至於Hc偏高為49 A/m。接著，將1 at%Pd經由不同溫度應力消除退火處理，而磁性質獲得最佳改善為退火溫度650K，Ms從1.28 T提升為1.34 T，而Hc從33.0 A/m下降至14 A/m。顯示進行消除應力熱處理確實減少晶格應變的內應力與急冷所引起的殘留應力，因此退火熱處理改善添加Pd元素造成磁性的損失。

The effect of minor Pd addition on glass forming ability and soft magnetic properties of Fe-Si-B metallic glass were investigated. The (Fe75Si10B15)100-xPdx (x = 0，0.5，1，2 at%) ingots via vacuum-arc-melting under argon atmosphere. A single roller melt-spinning method was employed to produce the alloy ribbons.
Structural results show that:(Fe75Si10B15)100-xPdx amorphous alloy ribbons, 0 at%Pd and 1 at%Pd ribbons have a tendency to slightly crystalline by XRD analysis and SEM observation. When Pd addition of 1% and 2% alloy belong to the amorphous structure. DSC thermal analysis shows that Fe-Si-B amorphous alloy add Pd has a Tg of characteristic temperature. And when the addition of 1at% with the best GFA (glass forming ability), the results for the Tg is 767.8 K and Tx is 841.3K. Finally, Kissinger plot method to obtain 1 at% has the highest activation energy of crystallization reach 447.95 kJ/mol, that show it has high thermal stability. The magnetic measurements show the value of Ms is 1.28 T, 1.30 T,and the value of Hc is 33.0, 30.8 A/m for 1 at%, 2 at%. The Fe-Si-B amorphous ribbons with the highest Ms 1.52 T. The Fe-Si-B The alloy has the exist of microcrystals in the amorphous base, so that the value of Hc is as high as 49 A / m. Then, 1 at% alloy ribbons annealed at different temperatures for 10 minutes. The magnetic properties of the best improvements for the annealing temperature of 650K, Ms upgrade from 1.28 T to 1.34 T, Hc from 33.0 A/m down to 14.0 A/m. Therefore, The stress-relief annealed treatments really reduce the residual stress caused by the internal stress of the lattice strain and quench. Therefore, the annealing heat treatment to improve the magnetic losses caused by the addition of the Pd.

目 錄

摘 要 i
ABSTRACT ii
誌 謝 iii
目 錄 iv
表目錄 vii
圖 目 錄 viii
第一章 前言 1
1.1 非晶質軟磁性合金 1
1.2 研究動機 2
第二章 文獻回顧與理論基礎 4
2.1 金屬玻璃合金形成條件 4
2.1.1 實驗歸納法則-A.Inoue之三項經驗法則 4
2.1.2相關理論-非晶態合金結構 5
2.1.3 熱力學觀點[] 8
2.2 非晶質合金之熱力學特性 9
2.2.1 玻璃轉化溫度 9
2.2.2 居禮溫度(Curie temperature) 12
2.3 璃形成能力及熱穩定性之參數 13
2.3.1 簡約玻璃轉變溫度 Trg =Tg/Tl 13
2.3.2 過冷液態溫度溫度區ΔTx=Tx-Tg 14
2.3.3 γ參數γ=Tx/ (Tg+Tl ) 15
2.4 非晶結構判定 21
2.5 熱分析動力學 23
2.6 磁性理論 26
2.6.1磁性分類 26
2.6.2 磁異向性 (Magnetic anisotropy) 31
2.6.3非晶軟磁特性 33
第三章 實驗流程與方法 35
3.1 實驗流程 35
3.2 合金薄帶之製備 36
3.2.1 合金成份配製 36
3.2.2 合金熔煉 36
3.2.3 合金薄帶製程 37
3.2.4 合金薄帶熱處理 38
3.3 材料分析 39
3.3.1 X光繞射儀 39
3.3.2 同步熱分析儀 40
3.3.3 掃描式電子顯微鏡(SEM)與能量分散質譜儀(EDS) 41
3.3.4 振動樣品磁力儀 42
3.3.5 熱重分析計 44
第四章 結果與討論 45
4.1 試片外觀之觀察 45
4.1.1 母合金鑄錠外觀 45
4.1.2 合金薄帶外觀 46
4.2 Pd的添加對於Fe-Si-B合金之結構與成份分析 46
4.2.1 母合金鑄錠XRD分析 46
4.2.2 合金薄帶XRD分析 49
4.2.3 合金薄帶SEM觀察 50
4.3 Pd的添加對於Fe-Si-B玻璃形成能力之影響 52
4.3.1 Fe-Si-B-Pd合金之熱性質分析 52
4.3.2一般之非恆溫分析法-Kissinger plot 55
4.4 Pd的添加對於Fe-Si-B之磁性質影響 58
4.4.1 Fe-Si-B-Pd合金之磁滯曲線量測 58
4.4.2 Fe-Si-B-Pd合金之居禮溫度量測 62
4.5 Fe-Si-B-Pd應力退火之軟磁性質影響 63
4.5.1 應力退火薄帶XRD分析 63
4.5.2 應力退火薄帶VSM分析 64
第五章 結論 68
第六章 未來工作與建議 69
參考文獻 70

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