Proceeding of the 42nd International Conference on Advanced Ceramics and Composites最新文献_第5页

Evaluation of New Technique to Estimate Yield Stress in Brittle Materials Via Spherical Indentation Testing 利用球形压痕试验估算脆性材料屈服应力的新技术评价

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2019-01-18 DOI: 10.1002/9781119543343.CH6

B. L. Hackett, A. Wereszczak, G. Pharr

引用次数: 3

Protective Coatings for SOFC Metallic Interconnects SOFC金属互连用保护涂层

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2019-01-18 DOI: 10.1002/9781119543343.CH14

Mark K. King, M. Mahapatra

引用次数: 3

Electroconductive Oxide Ceramics with Graphene-Encapsulated Fillers 石墨烯封装填料的导电氧化物陶瓷

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2019-01-18 DOI: 10.1002/9781119543343.CH25

I. Hussainova, M. Drozdova, R. Ivanov, S. Kale, I. Jasiuk

引用次数: 0

Effect of Control Mode and Test Rate on the Measured Fracture Toughness of Advanced Ceramics 控制方式和测试速率对高级陶瓷断裂韧性测量的影响

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2019-01-18 DOI: 10.1002/9781119543343.CH4

Bronson D. Hausmann, J. Salem

{"title":"Effect of Control Mode and Test Rate on the Measured Fracture Toughness of Advanced Ceramics","authors":"Bronson D. Hausmann, J. Salem","doi":"10.1002/9781119543343.CH4","DOIUrl":"https://doi.org/10.1002/9781119543343.CH4","url":null,"abstract":"The effects of control mode and test rate on the measured fracture toughness of ceramics were evaluated by using chevron-notched flexure specimens in accordance with ASTM C1421. The use of stroke control gave consistent results with about 2% (statistically insignificant) variation in measured fracture toughness for a very wide range of rates (0.005 to 0.5 mm/min). Use of strain or crack mouth opening displacement (CMOD) control gave ~5% (statistically significant) variation over a very wide range of rates (1 to 80 µm/m/s), with the measurements being a function of rate. However, the rate effect was eliminated by use of dry nitrogen, implying a stress corrosion effect rather than a stability effect. With the use of a nitrogen environment during strain controlled tests, fracture toughness values were within about 1% over a wide range of rates (1 to 80 µm/m/s). CMOD or strain control did allow stable crack extension well past maximum force, and thus is preferred for energy calculations. The effort is being used to confirm recommendations in ASTM Test Method C1421 on fracture toughness measurement.","PeriodicalId":206107,"journal":{"name":"Proceeding of the 42nd International Conference on Advanced Ceramics and Composites","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127972352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preliminary Characterization and Projections of PVD Coatings On SiC Cladding for Light Water Reactors 轻水反应堆SiC包层PVD涂层的初步表征与展望

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2019-01-18 DOI: 10.1002/9781119543381.CH12

C. Ang, D. Carpenter, K. Terrani, Y. Katoh

引用次数: 0

Phase Field Modelling of Microstructural Changes in NI/YSZ Solid Oxide Electrolysis Cell Electrodes NI/YSZ固体氧化物电解池电极微观结构变化的相场模拟

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2019-01-18 DOI: 10.1002/9781119543343.CH16

M. Trini, S. D. Angelis, P. S. Jørgensen, A. Hauch, Ming Chen, P. Hendriksen

{"title":"Phase Field Modelling of Microstructural Changes in NI/YSZ Solid Oxide Electrolysis Cell Electrodes","authors":"M. Trini, S. D. Angelis, P. S. Jørgensen, A. Hauch, Ming Chen, P. Hendriksen","doi":"10.1002/9781119543343.CH16","DOIUrl":"https://doi.org/10.1002/9781119543343.CH16","url":null,"abstract":"Solid oxide cells (SOC) are electrochemical devices that can operate efficiently both in fuel cell (solid oxide fuel cell, SOFC) and electrolysis mode (solid oxide electrolysis cell, SOEC). However, long-term performance degradation hinder the widespread commercialization of this technology. Nickel coarsening is a major cause of the decrease of the cells’ performance. Therefore, investigating and quantifying effects of nickel coarsening on the microstructural evolution in SOCs is crucial to understand the degradation processes occurring during operation. Focused-ion-beam scanning electron microscopy (FIB-SEM) tomography and phase field (PF) modelling are used to investigate the microstructure evolution of Ni/Yttria-Stabilized Zirconia (YSZ) SOC fuel electrodes. A cell, tested as part of a 25 cells stack for 9000 hours, and a reference cell (never operated) are reconstructed using FIB-SEM tomography. Microstructural parameters were calculated on the two cells showing that the percolated triple phase boundary (TPB) length in the cell decreases from 1.85 µm/µm 3 for the reference cell to only 1.01 µm/µm 3 for the long-term tested one. Phase field simulations were run on the reference cell geometry and microstructural parameters such as particle size distribution (PSD), TPB length and surface areas are computed and quantified on the simulated volumes. A trend of decreasing percolated TPB length with time is observed in the simulations. The numerical results are used to investigate the effects of nickel coarsening as well as to obtain information on the kinetics of the phenomenon.","PeriodicalId":206107,"journal":{"name":"Proceeding of the 42nd International Conference on Advanced Ceramics and Composites","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122182947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Oxidation Study of an Ultra High Temperature Ceramic Coating Based on HFSiCN 基于HFSiCN的超高温陶瓷涂层的氧化研究

Proceeding of the 42nd International Conference on Advanced Ceramics and Composites Pub Date : 2018-01-21 DOI: 10.1002/9781119543343.CH7

Dagny Sacksteder, D. Waters, Dongming Zhu

{"title":"Oxidation Study of an Ultra High Temperature Ceramic Coating Based on HFSiCN","authors":"Dagny Sacksteder, D. Waters, Dongming Zhu","doi":"10.1002/9781119543343.CH7","DOIUrl":"https://doi.org/10.1002/9781119543343.CH7","url":null,"abstract":"High temperature fiber-reinforced ceramic matrix composites (CMCs) are important for aerospace applications because of their low density, high strength, and significantly highertemperature capabilities compared to conventional metallic systems. The use of the SiCf/SiC and Cf/SiC CMCs allows the design of lighter-weight, more fuel efficient aircraft engines and also more advanced spacecraft airframe thermal protection systems. However, CMCs have to be protected with advanced environmental barrier coatings when they are incorporated into components for the harsh environments such as in aircraft engine or spacecraft applications. In this study, high temperature oxidation kinetics of an advanced HfSiCN coating on Cf/SiC CMC substrates were investigated at 1300°C, 1400°C, and 1500°C by using thermogravimetric analysis (TGA). The coating oxidation reaction parabolic rate constant and activation energy were estimated from the experimental results. The oxidation reaction studies showed that the coatings formed the most stable, predominant HfSiO4-HfO2 scales at 1400°C. A peroxidation test at 1400°C then followed by subsequent oxidation tests at various temperatures also showed more adherent scales and slower scale growth because of reduced the initial transient oxidation stage and increased HfSiO4-HfO2 content in the scales formed on the HfSiCN coatings.","PeriodicalId":206107,"journal":{"name":"Proceeding of the 42nd International Conference on Advanced Ceramics and Composites","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125671531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1