NexTech Materials, Ltd. M M. Seabaugh, K. Hasinska, B ......Materials Development for SOFCs: Seals...
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Materials Development for SOFCs: Seals and Electrolytes Materials Development for SOFCs: Seals and Electrolytes NexTech Materials, Ltd. NexTech Materials, Ltd. M. Seabaugh, K. Hasinska, B. M. Seabaugh, K. Hasinska, B. Emley Emley , J. , J. Jayjohn Jayjohn and S. Swartz and S. Swartz Objectives: Prepare Co-Sintered Electrolyte SOFCs • Interfacial Layer to Allow High Temperature Sintering • Tailored Sinterability of Electrolyte Layer Demonstrate Electrolyte and Interfacial Layers • Tailor Coating and Substrate Shrinkage • Tailor Interfacial Layer Porosity, Phase Distribution Objectives: Low Operating Temperature • 600ºC<T < 800ºC Flexible Configuration • Compatible with SECA Stack Designs and Materials Thermally and Mechanically Robust • Able to Withstand Thermal Cycling Composite Approach • Tailoring Thermo-mechanical Properties Chemical Compatibility NEXTECH MATERIALS Textured Composite Seal Materials Textured Composite Seal Materials DOE Contract Number: DOE Contract Number: DE DE - - FG02 FG02 - - 02ER83528 02ER83528 — — Phase II SBIR Phase II SBIR 20 µm 20 µm 20 µm 30 µm YSZ Interlayer NiO/YSZ LSM Electrolyte Deposition Electrolyte Deposition via via Aerosol Spray Aerosol Spray Co Co - - Sintering of Thin Film Electrolytes Sintering of Thin Film Electrolytes DOE Contract Number: DE DOE Contract Number: DE - - FG02 FG02 - - 03ER83729 03ER83729 — — Phase I SBIR Phase I SBIR Crystalline Phase (75-90% by volume) Provides Rigidity, Mechanical Strength Retains Glass in Pores Candidate Materials: Mica, Talc, Alumina, Zirconia Fibers Amorphous Phase Provides Compliance Seals Leaks From Pores Candidate Composition: CaO-BaO-SiO 2 -Al 2 O 3 Dried Tape Punched to Form Gaskets Tape Casting Orients Particles to Form “Brick-Wall” Microstructure Anisotropic Particles Glass Formers and Binders are Mixed to Form Tape Casting Slurry Technical Approach Tape Cast Seal Manufacturing • Tailored Seal Geometry • Easily Shaped • Conformable Precursor Tape 20 µm 200 µm ZrO 2 Fibers Al 2 O 3 Platelets -0.25 0.75 1.75 2.75 3.75 0% 5% 10% 15% 20% 25% 30% Glass Volume % log (sccm/cm) Talc Mica Alumina -1.0 0.0 1.0 2.0 3.0 4.0 0 10 20 30 40 50 60 70 80 90 100 Time (Hours) log (sccm/cm) Mica, 15% Glass Seal, 80 psi compressive force Talc, 15% Glass Seal, 80 psi compressive force Inconel 600 Tube Pressure Vessel Test Seal Sample Fixed External Load 5-80 psi Programmable Furnace RT-1200 o C YSZ Support Pressure Decay Measured from 4 to 2 psi Based on Decay Time and Tube Circumference, the Leak Rate/cm was calculated. 20 µm 20 µm Green Deposited Film Film Fired at 1350°C Co Co - - sintered Electrolyte Deposited on Cathode Supports sintered Electrolyte Deposited on Cathode Supports Co Co - - sintered Electrolyte Deposited on Planar Electrodes sintered Electrolyte Deposited on Planar Electrodes Phase I Seal Testing Sealing Concept Phase I Seal Testing Demonstration of Laboratory Scale Coating Deposition on Cathode Support Tubes
Transcript of NexTech Materials, Ltd. M M. Seabaugh, K. Hasinska, B ......Materials Development for SOFCs: Seals...
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Materials Development for SOFCs: Seals and ElectrolytesMaterials Development for SOFCs: Seals and ElectrolytesNexTech Materials, Ltd.NexTech Materials, Ltd.M. Seabaugh, K. Hasinska, B. M. Seabaugh, K. Hasinska, B. EmleyEmley, J. , J. JayjohnJayjohn and S. Swartzand S. Swartz
Objectives:Prepare Co-Sintered Electrolyte SOFCs
• Interfacial Layer to Allow High Temperature Sintering
• Tailored Sinterability of Electrolyte LayerDemonstrate Electrolyte and Interfacial Layers
• Tailor Coating and Substrate Shrinkage • Tailor Interfacial Layer
Porosity, Phase Distribution
Objectives:Low Operating Temperature• 600ºC
