本實驗研究八組不同成分含量的鉻、鋁、矽、鉬、鋯、鈷在鐵鉻鋁加熱元件系統中的影響，以Gleeble熱壓縮模擬實驗和高溫恆溫氧化、循環氧化實驗為主。為了取得真實應力應變曲線，熱壓縮實驗中的桶型效應可藉由量測最終試片尺寸參數求得摩擦力係數來修正。研究結果顯示，矽成分對於最高壓縮強度所占影響大於鉻的影響，而鉬成分的添加也有助於固溶強化，其中以21-6-Zr擁有最大的壓縮強度。在氧化實驗中，氧化層的形貌可以分為幾種，其中以21-6-Zr+Co所形成的氧化層最為平滑、連續且有好的附著性。研究結果也顯示21-6-Zr+Co的氧化層附著性在循環氧化測試中一樣能提供足夠的保護性質。

Eight heating element compositions (Alloy A-F and 21-6 series) have been designed base on the commercial alloy. With different content of Cr, Al, Si, Mo, Zr, and Co, the effect of alloying elements had been studied by Gleeble hot compression test and high temperature oxidation test. In order to identify the true stress in compression test, barrel effect had also been corrected by friction factor. Experimental results indicate that Si content play a larger role in ultimate compressive strength than Cr content and Mo give aids to solution strengthening too. 21-6-Zr series have the highest ultimate compressive strength among the alloys. The oxide morphology after 1100˚C 500 hours had been observed. There are different types of morphology and only 21-6-Zr+Co has a flat continuous aluminum oxide. The 21-6-Zr shows parabolic growth in cyclic oxidation test.

Abstract I
摘要 II
Acknowledgements III
Table of Contents V
List of Figures VII
List of Tables IX
1. Introduction 10
2. Literature review 13
2.1. Heating elements and their applications 13
2.2. Effect of elements in heating elements 15
2.2.1. Chromium 15
2.2.2. Aluminum 16
2.2.3. Silicon 17
2.2.4. Molybdenum 17
2.2.5. Zirconium 18
2.2.6. Cobalt 18
2.3. The third element effect 19
2.4. Barrel correction for compressive true stress-strain curve 21
3. Experiments 22
3.1. Alloy design 22
3.2. Material preparation for experiments 23
3.3. Gleeble hot deformation test 23
3.4. Oxidation test 24
3.4.1. Isothermal oxidation weight gain test 24
3.4.2. Cyclic oxidation weight change test 24
3.5. Microstructure analysis 25
3.6. XRD analysis 25
4. Results and discussion 26
4.1. As-cast material 26
4.1.1. CALPHAD simulation (Thermo-Calc) 26
4.1.2. Microstructure of as-cast material 31
4.2. Gleeble hot deformation test 32
4.3. Oxidation test 35
4.3.1. Isothermal oxidation weight gain test 35
4.3.2. Cyclic oxidation weight change 40
5. Conclusion 42
Reference 43

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