固態氧化物燃料電池封裝玻璃與金屬連接板接合件潛變性質分析

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林坤亮(Kun-liang Lin) 查詢紙本館藏

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機械工程學系

論文名稱

固態氧化物燃料電池封裝玻璃與金屬連接板接合件潛變性質分析
(Analysis of Creep Properties of Glass Ceramic Sealant and Its Joint with Metallic Interconnect for Solid Oxide Fuel Cells)

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摘要(中)

本研究主旨在探討經過不同時效處理之GC-9封裝玻璃陶瓷燒結試片，在800 oC下的潛變性質與破壞模式，並探討金屬連接板不銹鋼(Crofer 22 H)與封裝玻璃陶瓷接合件於800 oC下之潛變性質與不同負載模式下之破壞形態。
實驗結果顯示，經過1000小時時效處理後之GC-9玻璃陶瓷燒結試片，於相同的應力負載下，其變形量比未時效及100小時時效之試片來得低且具有較長的潛變壽命，此乃於結晶量較多及粗大化所致。藉由最小應變率來看，未時效試片之最小應變率明顯高於其時效處理後的試片，由此可證，時效時間越長，抵抗潛變變形的能力越高。在潛變壽命方面，欲達到1000小時以上之壽命，未時效、100小時時效及1000小時時效所施加的應力負載分別需小於6 MPa、9 MPa及15 MPa，再次證明經由時效過後的試片，所能承受之負載較大，抵抗潛變變形的能力越高。
關於GC-9玻璃陶瓷與Crofer 22 H金屬連接板接合件的潛變性質，接合件試片於800 oC下的剪力與拉力潛變壽命會隨著負載減少而增加。在剪力試片方面，具1000小時壽命的潛變強度約為剪力接合件強度的四分之一，而張力試片具1000小時壽命的潛變強度則約為張力接合件強度的百分之九。另外，對於剪力及張力潛變試片，不論其潛變壽命長短，其裂紋皆始於尖晶石與鉻酸鋇層之界面，隨後沿著鉻酸鋇層生長，而後在鉻酸鋇層與玻璃陶瓷基材之間交替遊走，最後在玻璃陶瓷基材內發生破壞。

摘要(英)

Creep properties at 800 oC are investigated for a newly developed solid oxide fuel cell glass-ceramic sealant (GC-9) in variously aged conditions using a ring-on-ring test technique. Creep properties of sandwich joint specimens made of GC-9 and a interconnect steel (Crofer 22 H) are also investigated at 800 oC under several constant shear and tensile loadings.
When subjected to an applied constant load at 800 oC, the 1000 h-aged GC-9 can last longer than the non-aged and 100 h-aged ones before rupture. The 1000 h-aged GC-9 also exhibits a much smaller minimum creep strain rate than do the non-aged and 100 h-aged ones. Therefore, a longer aging time of 1000 h leads to a greater extent of crystallization and creep resistance at 800 oC for the given GC-9 glass-ceramic sealant. The creep strength at 1000 h is about 6 MPa, 9 MPa, and 15 MPa, for the non-aged, 100 h-aged, and 1000 h-aged GC-9, respectively.
The creep rupture time of Crofer 22 H/GC-9/Crofer 22 H joint specimens is increased with a decrease in the applied constant load at 800 oC for both shear and tensile loading modes. The creep strength at 1000 h under shear loading is about one quarter of the shear strength at 800 oC. The tensile creep strength at 1000 h is about 9% of the tensile strength at 800 oC. Failure patterns of both shear and tensile joint specimens are similar regardless of the creep rupture time. Cracks initiate at the interface between the spinel layer and chromate (BaCrO4) layer, penetrate through the BaCrO4 layer, and propagate along the interface between the chromate layer and glass-ceramic substrate until final fracture. Final, fast fracture occasionally takes place within the glass-ceramic layer.

關鍵字(中)

★ Ring-on-ring測試
★ 潛變
★ 固態氧化物燃料電池
★ 封裝玻璃陶瓷

關鍵字(英)

★ Solid oxide fuel cell
★ Glass ceramic sealant
★ Ring-on-ring test
★ Creep

論文目次

TABLE OF CONTENTS
Page
LIST OF TABLES VI
LIST OF FIGURES VII
NOMENCLATURE XI
1. INTRODUCTION 1
1.1 Solid Oxide Fuel Cell 1
1.2 Glass Sealant 2
1.3 Joint of Glass-Ceramic Sealant, Metallic Interconnect, and Cell 5
1.4 Creep 8
1.5 Purposes and Scope 10
2. MATERIALS AND EXPERIMENTAL PROCEDURES 12
2.1 Creep Test of GC-9 Glass-Ceramic 12
2.1.1 Materials and specimen preparation 12
2.1.2 Ring-on-ring creep test 13
2.2 Creep Test of Joint of Glass-Ceramic Sealant and Metallic Interconnect 15
2.2.1 Materials and specimen preparation 15
2.2.2 Creep test 16
2.2.3 Microstructural analysis 17
3. RESULTS AND DISCUSSION 18
3.1 Creep Properties of Variously Aged GC-9 Glass-Ceramic 18
3.1.1 Microstructure 18
3.1.2 Creep deformation 19
3.1.3 Creep ruptire time 22
3.1.4 Failure analysis 24
3.2 Creep Properties of Joint of Glass-Ceramic Sealant and Metallic Interconnect 25
3.2.1 Creep rupture behavior 25
3.2.2 Failure analysis 26
4. CONCLUSIONS 33
REFERENCES 35
TABLES 38
FIGURES 40
APPENDIX: FRACTURE TOUGHNESS TEST OF PEN/GLASS-CERAMIC SEALANT/INTERCONNECT JOINT 99
A.1 Materials and Experimental Procedures 99
A.1.1 Materials and specimen preparation 99
A.1.2 Four point bending test 100
A.1.3 Vickers indentation fracture toughness of PEN 103
A.2 Results and Discussion 105
A.3 Summary 106
REFERENCES 107

參考文獻

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指導教授

林志光(Chih-kuang Lin)

審核日期

2012-8-21

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