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[표제지 등]=0,1,2

제출문=0,3,1

최종연구보고서 초록=0,4,1

요약문=1,5,6

Summary=7,11,6

Contents=13,17,2

목차=15,19,4

표목차=19,23,2

그림목차=21,25,10

제1장 연구개발과제의 개요=31,35,2

제2장 국내ㆍ외 기술개발 현황=33,37,12

제3장 연구개발 수행내용 및 결과=45,49,1

제1절 고온 용융염에서 Ni-base 및 Fe-base 초합금의 부식거동=45,49,1

1. 실험 방법=45,49,1

가. 시편 제작=45,49,1

나. 부식실험=45,49,2

다. 부식거동 측정=46,50,2

2. 연구 결과=48,52,1

가. Ni-base 합금의 부식 특성=48,52,1

(1) 부식속도 및 부식생성물=48,52,4

(2) 부식반응 기구=51,55,11

(3) 결론=62,66,1

나. Fe-base 합금의 부식 특성=63,67,1

(1) 부식 생성물=63,67,4

(2) 부식속도=66,70,1

(3) 부식 특성=67,71,7

(4) 결론=74,78,1

제2절 고온용융염 산화분위기에서 초합금 및 Pyro-Carbon의 부식거동=75,79,1

1. 실험방법=75,79,1

가. 시편준비=75,79,2

나. 시편의 표면처리=76,80,2

다. 부식실험=77,81,2

2. 결과 및 고찰=78,82,1

가. Pyro-Carbon=78,82,1

(1) 부식거동=78,82,4

(2) 열중량 분석=81,85,3

나. 초합금의 부식거동=83,87,3

다. 선정합금의 부식거동=86,90,1

(1) 부식속도=86,90,4

(2) 부식생성물=89,93,4

(3) 부식거동=92,96,7

라. 표면처리(Y-Al 코팅)=98,102,1

(1) Al - Y 복합코팅=98,102,2

(2) 부식속도=100,104,2

(3) 부식 거동=101,105,5

(4) 부식생성물=105,109,3

3. 결론=108,112,3

제3절 Plasma Spray를 이용한 초합금의 고온 부식거동=111,115,1

1. 실험 방법=111,115,1

가. 기판선정 및 초합급의 부식실험=111,115,1

나. 표면 개질=111,115,1

(1) 기판 및 형상=111,115,2

(2) Bond Coating=112,116,1

(3) 세라믹 코팅=112,116,2

다. Pyro-Carbon=113,117,1

라. 실험방법=114,118,1

2. 결과 및 고찰=115,119,1

가. 초합금의 부식거동=115,119,1

(1) 부식속도=115,119,2

(2) 부식거동=116,120,4

나. Bond Coating=119,123,5

다. Bond & Top Coating=123,127,8

라. Pyro-Carbon=130,134,4

3. 결론=133,137,2

제4절 ANL 제공 시편의 교차실험=135,139,1

1. 실험 방법=135,139,2

2. 결과 및 고찰=136,140,1

가. 부식속도=136,140,2

나. 부식생성물=137,141,3

다. 부식층 Morphology=139,143,8

3. 결론=146,150,2

제5절 총론=148,152,1

1. 초합금의 부식거동=148,152,3

2. ANL 선정물질의 Cross-Check=150,154,2

3. 표면 개질(Surface Modification)=151,155,2

4. 비금속물질의 적용=152,156,3

제4장 목표달성도 및 관련분야에의 기여도=155,159,2

제5장 연구개발결과의 활용계획=157,161,2

제6장 참고문헌=159,163,6

서지정보양식=165,169,2

표목차

Table 1.1. Chemical Compositions Of Tested Material=46,50,1

Table 1.2. The Experimental Conditions=47,51,1

Table 2.1. Chemical Compositions Of Tested Materials=75,79,1

Table 2.2. Characteristics Of Tested Materials=76,80,1

Table 2.3. The Experimental Conditions=78,82,1

Table 2.4. Weight Changes Of Pyro-Carbon Corroded At 650℃ And 750℃ For 72 Hrs=79,83,1

Table 2.5. Corrosion Products Of The Alloys Corroded At 650℃ For 72 ~ 360 Hrs=91,95,1

Table 2.6. Corrosion Products Of Haynes263 And The Coated Haynes 263 Corroded At 650℃ For 72 And 168 Hrs=106,110,1

Table 3.1. Chemical Compositions Of Tested Materials=111,115,1

Table 3.2. Characteristics Of Coating Materials And Substrate=113,117,1

Table 3.3. Basic Parameters Used In The Plasma Spray=113,117,1

Table 3.4. The Test Conditions Of The Crucible Test=114,118,1

Table 3.5. Corrosion Results Of 9 Day-Test At 675℃=116,120,1

Table 3.6. Standard Gibb's Free Energies Of Reaction Between Ceramics And Chlorine At 650℃=125,129,1

Table 3.7. Corrosion Results Of Pyro-Carbon=132,136,1

Table 4.1. Chemical Compositions Of Tested Alloys=136,140,1

Table 4.2. Corrosion Rate Of Tested Alloys=137,141,1

Table 4.3. Corrosion Products Of Tested Alloys=139,143,1

Table 4.4. Area Changes And Depth Of Corrosion Attack Of Alloys Corroded At 675℃ For 9 Days=146,150,1

그림목차

Fig. 1.1. Schematic Diagram Of Apparatus For Corrosion Test=47,51,1

Fig. 1.2. Corrosion Rates Of Ni-base Alloys With Time At 650℃(a), With Temperature For 72 Hrs(b)=48,52,1

Fig. 1.3. Appearance Of Ni-base Alloys After Corrosion Test=49,53,1

Fig. 1.4. XRD Patterns Of Ni-base Alloys Corroded At 650℃ For 72 Hrs(a), At 725℃ For 72 Hrs(b), At 725℃ For 168 Hrs(c) And At 650℃ For 288 Hrs(d)=50,54,1

Fig. 1.5. Cross-Secsional SEM Images And Spot Chemical Analysis Results Of (a) Gas Exposed Region And (b) Salt Exposed Region Of Inconel 600 Corroded At 650℃ For 72 Hrs=52,56,1

Fig. 1.6. The Corrosion Mechanism Of Inconel 600=53,57,1

Fig. 1.7. Line Profiles Of The Cross-Secsional SEM Images On Inconel 600 Corroded In Molten Salt Of LiCl-3%Li₂O Oxidized Condition At (a) 650℃ And (b) 725℃ For 72 Hrs=55,59,1

Fig. 1.8. Cross-Secsional SEM Image And Spot Chemical Analysis Results Of Inconel 600 Corroded At 725℃ For 168 Hrs=56,60,1

Fig. 1.9. Cross-Secsional SEM Images Of Inconel Alloys Corroded At 725℃ For 72 Hrs(a) And 650℃ For 288 Hrs(b)=57,61,1

Fig. 1.10. (a) SEM Morphology And (b) Cross-Secsional SEM Images And Maps Of Cr, O, Al, Ni Of Inconel 601 Corroded At 725℃ For 168 Hrs=58,62,1

Fig. 1.11. Cross-Secsional SEM Image And Maps Of Cr, O, Al, Ni Of Inconel 601 Corroded At 725℃ For 168 Hrs=59,63,1

Fig. 1.12. (a) Cross-Secsional SEM Image And (b) Map Of Cr Of Inconel 690 Corroded At 725℃ For 168 Hrs=59,63,1

Fig. 1.13. Cross-Secsional SEM Images And Maps Of Cr, Fe And Ni Of Inconel Alloys Corroded At 650℃ For 312 Hrs=61,65,1

Fig. 1.14. XRD Petterns Of Corrosion Products Of Fe-base Alloys Tested In Various Conditions((a)Specimen(650℃,72Hrs) (b)Temperature(316LN S.S, 72Hrs) Time(Inconel 800H, 650℃)=63,67,1

Fig. 1.15. Gibb's Free Energy(ΔG) Of Corrosion Products Related With Fe, Cr, Ni And O₂=64,68,1

Fig. 1.16. Cross-Secsional SEM Images And Line Quantitative Analyses Of (a) Incoloy 800H And (b) 316LN S.S. Tested At 650℃ For 72 Hrs=65,69,1

Fig. 1.17. Weight Loss Of Each Sample With Time At 725℃(a) And With Temperature For 72 Hrs(b)=66,70,1

Fig. 1.18. Appearance Of Fe-base Alloys Afiter Corrosion Test=67,71,1

Fig. 1.19. Cross-Secsional SEM Images Of Scale/Matrix Of Fe-base Alloys Corroded At 725℃ For 72 Hrs, (a) 316LN S.S (b) 321 S.S (c) Incoly 800H=68,72,1

Fig. 1.20. Cross-Secsional SEM Images And Point Quantitative Analysis Of 321 S.S Corroded At 725℃ For 72 Hrs, (a) Oxide Layer/Scale/Matrix (b) Scale/Matrix=69,73,1

Fig. 1.21. (a) Cross-Secsional SEM Image, (b) Point And Line Quantitative Analysis Results Of Incoloy 800H Corroded At 725℃ For 72 Hrs=71,75,1

Fig. 1.22. (a) Cross-Secsional SEM Images And Maps Of (b) Cr, (c) Ni And (d) Fe Of Fe-base Alloys Corroded At 725℃ For 72 Hrs=72,76,1

Fig. 2.1. XRD Patterns Of Pyro-Sarbon Corroded At 650℃ And 750℃ For 72 Hrs=80,84,1

Fig. 2.2. The Morphology Of Pyro-Carbon Corroded At 650℃ For 72 Hrs=80,84,1

Fig. 2.3. Tg Curves Of Pyro-Carbon. (a) Raw Material, (b) After Test At At 650℃ For 72 Hrs, (c) After Test At 750℃ For 72 Hrs=82,86,1

Fig. 2.4. Weight Loss Of The Alloys Corroded At 650℃ For 72 Hrs=84,88,1

Fig. 2.5. Cross-Secsional SEM Images Of The Alloys Corroded At 650℃ For 72 Hrs=84,88,1

Fig. 2.6. Weight Loss Of The Alloys Corroded At 650℃, As A Funtion Of Reaction Time=87,91,1

Fig. 2.7. Effect Of Li₂O Concentration On The Weight Loss Of The Alloys Corroded At 650℃ For 72 Hrs=88,92,1

Fig. 2.8. Effect Of O₂ Concentration In Mixed Gas On The Weight Loss Of The Alloys Corroded At 650℃ For 72 Hrs=88,92,1

Fig. 2.9. Appearance Of Ni-base Alloys After Corrosion Test=89,93,1

Fig. 2.10. XRD Patterns Of Corrosion Products Of (a) Haynes 75, (b) Haynes 263, (c) Inconel 718, (d) Inconel X-750 Corroded At 650℃ For 72 ~ 360 Hrs=90,94,1

Fig. 2.11. Cross-Secsional SEM Image And Elemental Distribution Of Unspalled Outer Scale Of Haynes 75 Corroded At 650℃ For 168 Hrs=92,96,2

Fig. 2.12. Cross-Secsional SEM Image And Elemental Distribution Of Unspalled Outer Scale Of Haynes 263 Corroded At 650℃ For 360 Hrs=95,99,1

Fig. 2.13. Cross-Secsional SEM Image And EDS Results Of Inconel 718 Corroded At 650℃ For 72 Hrs=97,101,1

Fig. 2.14. Cross-Secsional SEM Image And EDS Results Of Inconel X-750 Corroded At 650℃ For 72 Hrs=98,102,1

Fig. 2.15. Cross-Secsional SEM Image(a) And XPS Results(b) Of Al+Y Coated Alloys=99,103,1

Fig. 2.16. Weight Loss Of Y+Al Non-Coated And Coated Haynes 263 Corroded At 650℃ For (a) 72 Hrs And (b) 168 Hrs=100,104,2

Fig. 2.17. Cross-Secsional SEM Image And EDS Results Of Al+Y Coated Haynes 263 Corroded At 650℃ For 72 Hrs In Molten Salt Of LiCl-3%Li₂O=102,106,1

Fig. 2.18. Cross-Secsional SEM Image And EDS Results Of Al+Y Coated Haynes 263 Corroded At 650℃ For 72 Hrs In Molten Salt Of LiCl-8%Li₂O=103,107,1

Fig. 2.19. Cross-Secsional SEM Image And EDS Results Of Al+Y Coated Haynes 263 Corroded At 650℃ For 168 Hrs In Molten Salt Of LiCl-3%Li₂O=104,108,1

Fig. 2.20. Cross-Secsional SEM Image And EDS Results Of Al+Y Coated Haynes 263 Corroded At 650℃ For 168 Hrs In Molten Salt Of LiCl-8%Li₂O=105,109,1

Fig. 2.21. Corrosion Products Of Y+Al Coated Haynes 263 Corroded At 650℃ For (a) 72 Hrs And (b) 168 Hrs=106,110,1

Fig. 3.1. Weight Loss Of The Alloys Corroded At 675℃, As A Function Of Time=115,119,1

Fig. 3.2. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 72 Hrs=117,121,1

Fig. 3.3. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs=118,122,1

Fig. 3.4. Cross-Secsional SEM Image And Elemental Distribution Of Nimonic 80A And Nimonic 90 Corroded At 675℃ For 216 Hrs=119,123,1

Fig. 3.5. Photographs Of Coated Specimen Corroded At 675℃ For 216 Hrs=120,124,1

Fig. 3.6. Cross-Secsional SEM Images Of As-Coated And 9 Day-Tested Specimen=120,124,1

Fig. 3.7. Cross-Secsional SEM Image And Elemental Distribution Of Outer Scale Of NiCoCrAlY Coated And Aluminized Inconel 713LC Corroded At 675℃ For 216 Hrs=121,125,1

Fig. 3.8. Cross-Secsional SEM Image And Elemental Distribution Of Non-Outer Scale Of NiCoCrAlY Coated And Aluminized Inconel 713LC Corroded At 675℃ For 216 Hrs=121,125,1

Fig. 3.9. Cross-Secsional SEM Image And Elemental Distribution Of Outer Scale Of NiCrAlY Coated And Aluminized Inconel 713LC Corroded At 675℃ For 216 Hrs=122,126,1

Fig. 3.10. Cross-Secsional SEM Image And Elemental Distribution Of Non-Outer Scale Of NiCrAlY Coated And Aluminized Inconel 713LC Corroded At 675℃ For 216 Hrs=123,127,1

Fig. 3.11. Cross-Secsional SEM Images Of As-Coated NiCoCrAlY Bond, Ceramics Top And Aluminizing Of Incoel 713LC=123,127,1

Fig. 3.12. Cross-Secsional SEM Images Of As-Coated NiCrAlY Bond, Ceramics Top And Aluminizing Of Incoel 713LC=124,128,1

Fig. 3.13. Photographs Of As-Coated(NiCrAlY/Aluminizing/Ceramics) And 9-Day Tested Specimen=125,129,1

Fig. 3.14. Photographs Of As-Coated(NiCoCrAlY/Aluminizing/Ceramics) And 9-Day Tested Specimen=126,130,1

Fig. 3.15. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs.(Bond Coat : NiCoCrAlY-Aluminizing-Top Coat : YSZ)=127,131,1

Fig. 3.16. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs.(Bond Coat : NiCoCrAlY-Aluminizing-Top Coat : MgO+ZrO₂)=127,131,1

Fig. 3.17. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs.(Bond Coat : NiCrAlY-Aluminizing-Top Coat : YSZ)=128,132,1

Fig. 3.18. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs.(Bond Coat : NiCrAlY-Aluminizing-Top Coat : MgO+ZrO₂)=128,132,1

Fig. 3.19. Photographs Of As-Coated And 9-Day Tested Specimen.(Bond Coat : NiCrAlY-Top Coat : YSZ)=129,133,1

Fig. 3.20. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs.(Bond Coat : NiCrAlY-Top Coat : YSZ)=130,134,1

Fig. 3.21. Cross-Secsional SEM Image And Elemental Distribution Of Inconel 713LC Corroded At 675℃ For 216 Hrs.(Bond Coat : NiCrAlY-Top Coat : MgO-ZrO₂)=130,134,1

Fig. 3.22. Photographs Of Raw And Tested Specimen=131,135,1

Fig. 3.23. XRD Patterns Of Pyro-Carbon After (a) 15-Day Test And (b) 25-Day Test=132,136,1

Fig. 3.24. Compressive Strength Of Pyro-Carbon=133,137,1

Fig. 4.1. Corrosion Rate Of Tested Alloys=138,142,1

Fig. 4.2. Cross-Secsional SEM Images And Elemental Distribution Of Inconel MA 754 Corroded At 675℃ For 3-Day Test(a) And 9-Day Test(b)=140,144,1

Fig. 4.3. Cross-Secsional SEM Images And Elemental Distribution Of Haynes 214 Corroded At 675℃ For 3-Day Test(a) And 9-Day Test(b)=141,145,1

Fig. 4.4. Cross-Secsional SEM Image And Elemental Distribution Of Outer Layer Detached Haynes 214 Corroded At 675℃ For 9-Day Test=142,146,1

Fig. 4.5. Cross-Secsional SEM Images And Elemental Distribution Of Haynes HR 160 Corroded At 675℃ For 3-Day Test(a) And 9-Day Test(b)=143,147,1

Fig. 4.6. Cross-Secsional SEM Images Of Outer Layer Detached Haynes HR 160 Corroded At 675℃ For 3-Day Test(a) And 9-Day Test(b)=143,147,1

Fig. 5.1. Summary Of Design Criteria And Requirement Of Alloy, Surface Modification And Non-Metallic Materials=153,157,1

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