機械合金製程製備軟磁性Fe72B20-XCXSi4Tm4 (Tm=Nb、Zr、Mo)鐵基粉末之研究

Preparation of Soft Magnetic Fe72B20-XCXSi4Tm4 (Tm=Nb, Zr, Mo) Fe-based Powders by Mechanical Alloying

廖國宏(Kuo-Hung Liao)

指導教授 ： 吳新明

大同大學/工程學院/材料工程學系所/碩士(2008年)

摘要

本研究以機械合金製程(Mechanical alloying, MA)，製備軟磁性Fe72B20-XCXSi4Tm4 (Tm=Nb、Zr、Mo；X=0、2、4、6、8 at %)鐵基粉末，分別探討Nb、Zr、Mo三種不同元素，並以不等量的C取代B，對於Fe-B-Si-Tm鐵基材料的非晶形成能力及其磁特性之影響。經XRD繞射分析結果，Fe-B-C-Si-Tm (Tm=Nb、Zr、Mo)三個成分系統球磨30小時，皆能得到典型非晶材料寬廣的繞射峰。熱分析結果顯示，Fe-B-C-Si-Tm (Tm=Nb、Zr、Mo)三個成分系統以少量C取代B，部分成分能夠量測到玻璃轉換溫度。利用Kissinger equation 計算結晶活化能，發現在各成分系統，以C少量取代B，其結晶活化能皆有提升，表示以C少量取代B能夠提升其非晶形成能力。各成分經過500 ℃去應力退火後，以XRD繞射分析，部分成分呈現出良好的熱穩定性，仍維持寬廣而平緩的繞射峰。磁性量測結果，以低溫去應力退火，能夠提升飽和磁化量，並降低本質矯頑磁力。本研究之部分成分能夠得到具有軟磁特性之Fe-B-C-Si-Tm鐵基非晶粉末。

關鍵字

本質矯頑磁力 ； 飽和磁化量 ； 軟磁 ； 機械合金製程 ； 非晶

並列摘要

This study prepared soft magnetic Fe72B20-XCXSi4Tm4 (Tm=Nb、Zr、Mo；X=0、2、4、6、8 at %) Fe-based powders by mechanical alloying technique. It investigated the effects of adding Nb, Zr, and Mo elements respectively to the Fe-B-Si-Tm Fe-based alloy and by substituting B with various amounts of C in the alloy on the forming ability of amorphous alloys and their magnetic properties. The XRD results indicate that the three Fe-B-C-Si-Tm (Tm=Nb、Zr、Mo) alloy systems, when subjected to mechanical milling for 30 h, can produce typical broad amorphous peaks. The thermal analysis results show that glass transition temperatures can be measured in some of the compositions in the Fe-B-C-Si-Tm (Tm=Nb、Zr、Mo) alloy systems. The activation energies for crystallization, calculated with Kissenger equation, for the three Fe-B-C-Si-Tm alloy systems increase relative to the Fe-B-Si-Tm alloy systems, indicating that the substitution of C with B can increase the forming ability of amorphous phase. The milled powders of various compositions were subjected to 500 ℃stress-relief treatment and show good thermal stability. The magnetic measurements on the stress-relieved powders show that their values of saturation magnetization are increased and the intrinsic coercive forces are decreased. This study found that some of the Fe-B-C-Si-Tm Fe-based powders exhibit good soft magnetic properties.

並列關鍵字

intrinsic coercive ； saturation mangetization ； soft magnetic ； mechanical alloying ； amorphous

參考文獻

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