금속염으로부터 Bi-Te계 열전재료의 합성
- Abstract
- The present study focused on the synthesis of a Bi-Sb-Te, Bi-Se-Te based alloyed powders with mechano-chemical process in which Bi salt, Sb salt, Se salt and Te oxide raw materials are mechanically milled and chemically reacted. The chemical composition, phase structure, particle size of the synthesized BST powders under various synthesis conditions were analyzed using ICP, XRD and SEM. The synthesized powder was sintered by the spark plasma sintering. The thermoelectric properties of sintered bodies of this powders were analyzed using ZEM-3 and laser flash method.
Bismuth aqua sulfate, antimony oxy-chloride and tellurium dioxide were used as raw powders for the Bi0.5Sb1.5Te3 powders and mixed by high energy ball milling process. The milled metallic salt powders show agglomerated particles between 100 nm and 500nm in size with almost faced or rounded shape. The precursor powder reveals surface morphologies of calcined powders with irrelgularly facetted shape and about a few μm in size. The oxide pahase of precursor powder are clearly transformed Bi0.5Sb1.5Te3 phase into that is corresponding to the designed phase. These, the fabricated Bi0.5Sb1.5Te3 powder shows p-type phase consisting of Bi0.5Sb1.5Te3 and particles with about 1㎛ and even distribution of irregular shaped powders. Figure of merit obtained by measuring seebeck coefficient, electric resistivity and thermal conductivity for fabricated Bi0.5Sb1.5Te3 bulk showed value with 0.8at25℃, having very similar value with about 0.82 at 25℃ that was figure of merit of the thermoelectric material manufactured with the conventional melting crushing process.
Bi2Se0.3Te2.7 powders are syntheized by a mechano-chemical process in which mixed Bi salt, Se salt and Te oxide powders were dried, calcinated and reduced into alloyed powders with ternary composition. The sintered Bi2Se0.3Te2.7 bulks showed value with 0.75 at150℃, having very similar value with about 0.72 at 150℃ that was figure of merit of the thermoelectric material manufactured with the conventional melting crushing process.
- Issued Date
- 2013
- Awarded Date
- 2013. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 신소재시스템공학과
- Advisor
- 이길근
- Table Of Contents
- 목차
Abstractⅳ
1. 서론 1
2. 이론적 배경 6
2.1 열전재료 6
2.1.1 열전현상 7
2.1.1.1 Seebeck 효과 8
2.1.1.2 Peltier 효과 9
2.1.1.3 Thomson 효과 9
2.1.1.4 성능지수10
2.1.2 열전재료의 종류 및 응용 16
2.2 Bi-Te계 열전재료 17
2.2.1 Bi-Te계 열전재료의 특징 17
2.2.2 Bi-Te계 열전재료의 제조 방법21
2.2.3 Bi-Te계 열전재료의 기술 개발 동향 24
2.3 Cu 제련 부산물의 회수기술 26
2.3.1 Cu 제련과정 26
2.3.2 유가 금속의 종류와 형태 27
2.3.3 유가금속의 가격과 매장량 28
3. 금속염의 고품위화 및 안정화 공정 45
3.1 서론 45
3.2 실험방법 46
3.3 결과 및 고찰 47
3.3.1 Bi 염의 고품위화 47
3.3.2 Te 염의 고품위화 50
3.3.3 Sb 염의 안정화 51
3.3.4 Se 염의 안정화 53
3.4 결론 56
4. Bi0.5Sb1.5Te3 열전분말 합성 기술 개발 81
4.1 서론 81
4.2 실험방법 82
4.3 결과 및 고찰 83
4.3.1 전구체 형성에 미치는 전구체 합성 온도의 영향 83
4.3.2 Bi0.5Sb1.5Te3상 형성에 미치는 환원 온도의 영향 87
4.3.3 Bi0.5Sb1.5Te3상 형성에 미치는 환원 시간의 영향 96
4.4 결론 101
5. Bi2Se0.3Te2.7 열전분말 합성 기술 개발 122
5.1 서론 122
5.2 실험방법 123
5.3 결과 및 고찰 124
5.3.1 전구체 형성에 미치는 전구체 합성 온도의 영향124
5.3.2 Bi2Se0.3Te2.7상 형성에 미치는 환원 온도의 영향 126
5.3.3 Bi2Se0.3Te2.7상 형성에 미치는 환원 시간의 영향 129
5.4 결론 132
6. Bi-Te계 소결체의 열전 특성 평가 145
6.1 서론 145
6.2 실험방법 146
6.2.1 소결146
6.2.2 특성평가147
6.3 결과 및 고찰 148
6.3.1 Bi0.5Sb1.5Te3소결체의 열전특성 148
6.3.2 Bi2Se0.3Te2.7소결체의 열전특성 153
6.4 결론 155
7. 총괄 결론 175
8. 참고문헌 177
- Degree
- Doctor
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