应我校材料学院王玉金教授邀请，韩国科学技术学院(Korea Advanced Institute of Science and Technology)材料科学与工程系杰出教授Suk-Joong L. Kang将于2018年11月3–7日来我校进行访问交流、科研合作，并作学术报告，欢迎广大师生参加。
报告一：
题目：Understanding Sintering Fundamentals
时间：2018年11月4日（星期日），上午9:00—11:00
地点：哈工大科学园C3栋特种陶瓷研究所417报告厅
摘要:
The basic phenomena occurring during solid-state sintering are densification and grain growth. Since the 1950s the kinetics of these two phenomena and their interactions have been studied under the assumption that the kinetics are governed solely by the diffusion of atoms. Our investigations, however, show that for systems with (even partially) faceted interfaces, not only grain growth but also densification can be governed by the reaction of atoms at the interface.
This presentation reviews the classical understanding of solid-state sintering and presents the new understanding of sintering and microstructural evolution, which are based on a mixed mechanism, either diffusion or interface reaction, of atom transport. Future research directions of sintering techniques and fundamentals are also commented on with respect to the new mechanism.
报告二：
题目：Strategies and Practices for Suppressing Abnormal Grain Growth during Liquid Phase Sintering
时间：2018年11月5日（星期一），上午9:00—11:00
地点：哈工大科学园C3栋特种陶瓷研究所417报告厅
摘要:
Abnormal grain growth (AGG) often occurs during liquid phase sintering of ceramics. It commonly exhibits several characteristics: (i) AGG always in systems with faceted grains; (ii) usually more intensive AGG with particle size reduction; (iii) sometimes, introduction of an incubation period before AGG (incubated AGG); and (iv) stagnation of grain growth after impingement of abnormal grains.
When a crystal grows in a liquid matrix, it is a result of serial processes of diffusion of atoms through the matrix and the reaction (atom attachment) at the solid/liquid interface. The growth rate of a faceted grain is governed by the interface reaction and the diffusion, respectively, for its driving force smaller and larger than a critical value, showing nonlinear growth kinetics. Based on this understanding, the mixed mechanism principle of microstructural evolution is deduced in terms of the coupling between the critical driving force for appreciable growth of grains and the maximum driving force for the growth of the largest grain in the sample. Several strategies for suppressing AGG are deduced from the principle and are tested experimentally in carbides and oxides. The experimental results support the generality of the microstructural evolution principle for controlling the microstructure during liquid phase sintering.
报告人简介
Suk-Joong L. Kang
Distinguished Professor,
Department of Materials Science and Engineering,
Korea Advanced Institute of Science and Technology,
291 Daehak-ro, Yuseong-gu, Daejeon, 305–701,
Korea
E-mail: sjkang@kaist.ac.kr
Suk-Joong L. Kang is a Distinguished Professor in the Department of Materials Science and Engineering at the Korea Advanced Institute of Science and Technology (KAIST). He is a member of Korean Academy of Science and Technology (1996), and National Academy of Engineering of Korea (2002). He received a Dr.-Ing degree from the Ecole Centrale de Paris (1980), and a Dr. d’ Etat degree from the University of Paris VI (1985). After joining KAIST in 1980, he also served as a Visiting Professor at the Stuttgart Max-Plank-Institut (’82-’83, ’88) at Samsung Electromechanics (’93-’94), at the University of New South Wales (’01-’02) and at the University of Tokyo (’08), and as President of the Korea Institute of Ceramic Engineering and Technology (KICET) (’15-’18).
Dr. Kang has published more than 280 papers on sintering and microstructural evolution in ceramics and metals. Since 2000, he has presented over 100 invited talks at international conferences. He is the author of the text Sintering: Densification, Grain Growth and Microstructure, published in 2005. He developed the “Pore Filling Theory” of liquid phase sintering. Since the late 1990’s, Dr. Kang has particularly contributed to the understanding of microstructural evolution by structural transition and defect formation at interfaces. He introduced the concept of the mixed control of boundary migration, and deduced the mixed mechanism principle of microstructural evolution. Dr. Kang is a fellow of the American Ceramic Society and a member of the World Academy of Ceramics, President-Elect of the International Ceramic Federation (’18-’20). He also served as President of the Korean Powder Metallurgy Institute (’06), the Korean Ceramic Society (’12), and the Asia-Oceania Ceramic Federation (’13-’14), and as Editor-in-Chief of the Journal of Asian Ceramic Societies (’13-’15). He is the recipient the Sosman Award from the American Ceramic Society (’11), the Richard Brook Award from the European Ceramic Society (’15), the Helmholtz International Fellow Award from the Helmholtz Gemeinschaft (Germany) (’15), the Inchon Prize from the Inchon Memorial Foundation (’07), and the Korea Engineering Prize from the President of the Republic of Korea (’10).