U.S.-Korea Cooperative Research on Microstructural Develop- ment and Characterization of Cyclic Fatique Crack Behavior of In Situ Toughened Monolithic SiC Ceramics

美韩合作研究原位增韧整体SiC陶瓷的微观结构发展和循环疲劳裂纹行为表征

• 批准号: 9507653
• 负责人: Robert Ritchie
• 金额: $ 3.71万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-03-15 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9507653&HistoricalAwards=false
• 关键词: U.S.; Korea; Cooperative; Research; Microstructural

9507653 Ritchie This award provides funds to permit Dr. Robert O. Ritchie, Department of Materials Science and Mineral Engineering, University of California, Berkeley, to pursue with Dr. Do Kyung Kim, Department of Ceramic Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), for 24 months, a program of cooperative research on microstructural development and characterization of cyclic fatigue crack behavior of in situ toughened monolithic silicon carbide (SiC) ceramics. The joint research will focus on the microstructural development of SiC ceramics sintered with oxide additives in order to promote optimal mechanical properties, especially, fatigue crack-growth behavior at elevated temperatures. The Korean collaborator will work primarily on the processing of recently developed in situ toughened SiC (including microstructural control), characterization of the microstructure, and determination of the role of additives on sintering behavior and mechanical properties, including toughness and flexural strength. SiC materials prepared at KAIST will be sent to the PI's laboratory where cyclic fatigue behavior will be characterized. Fatigue-crack propagation behavior will be evaluated over temperatures ranging from ambient to 1,800 C. This phase of the work will involve both macroscopic growth-rate measurements and characterization of microstructural damage mechanisms. Monolithic SiC-based ceramics are promising candidate materials for ultra-high temperature structural components in heat engines, heat exchangers, and many other devices because of their excellent oxidation resistance, strength retention at high temperatures, high wear resistance, good thermal conductivity, and relatively low coefficient of thermal expansion. Considerable expertise has been developed at KAIST in the production of these monolithic ceramics with improved microstructures. The PI's research group has developed considerable expertise in the characteriza tion of such ceramics at ambient and elevated temperatures. The PI and his Korean collaborator are highly respected researchers in the field of this proposal. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. This project is related to the PI's research supported under NSF Grant No. DMR- 9123279 and provides an international research experience for a U.S. graduate student. ***

9507653里奇 该奖项提供资金，允许罗伯特O。里奇，材料科学与矿物工程系，加州大学伯克利分校，追求博士杜京金，陶瓷科学与工程系，韩国科学技术高级研究所（KAIST），为24个月，原位增韧整体碳化硅（SiC）的微观结构发展和循环疲劳裂纹行为表征的合作研究计划陶瓷. 联合研究将侧重于使用氧化物添加剂烧结的SiC陶瓷的微观结构发展，以促进最佳机械性能，特别是高温下的疲劳裂纹扩展行为。 韩国合作者将主要致力于最近开发的原位增韧SiC的加工（包括微观结构控制），微观结构的表征，以及添加剂对烧结行为和机械性能（包括韧性和弯曲强度）的作用的确定。 在KAIST制备的SiC材料将被送到PI的实验室，在那里将对循环疲劳行为进行表征。 将在从环境温度到1，800 ℃的温度范围内评估裂纹扩展行为。 这一阶段的工作将涉及宏观增长率测量和微观结构损伤机制的表征。 整体SiC基陶瓷由于其优异的抗氧化性、高温强度保持性、高耐磨性、良好的导热性和相对较低的热膨胀系数，是用于热机、热交换器和许多其他装置中的超高温结构部件的有希望的候选材料。 KAIST在生产这些具有改进微观结构的单片陶瓷方面已经开发了相当多的专业知识。 PI的研究小组在环境温度和高温下对这种陶瓷的特性研究方面已经积累了相当多的专业知识。 PI和他的韩国合作者是该提案领域备受尊敬的研究人员。 该项目与美国的目标有关-韩国合作科学计划，旨在通过科学信息，思想，技能和技术的交流以及通过互利问题的合作来提高美国和韩国科学家和工程师之间的合作水平。 该项目与美国国家科学基金会资助号DMR- 9123279支持的PI研究有关，并为美国研究生提供国际研究经验。 ***