Dense B;C material was fabricated using spark plasma sintering(SPS), and the densification mechanisms and grain growth kinetics were revealed. The density, hardness, transverse flexure strength and toughness of sample...Dense B;C material was fabricated using spark plasma sintering(SPS), and the densification mechanisms and grain growth kinetics were revealed. The density, hardness, transverse flexure strength and toughness of samples were investigated and the model predictions were confirmed by SEM and TEM experimental observations. Results show that SPSed B;C exhibits two sintering periods: a densification period(1800-2000 °C) and a grain growth period(2100-2200 °C). Based on steady-state creep model, densification proceeds by grain boundary sliding and then dislocation-climb-controlled mechanism. Grain growth mechanism is controlled by grain boundary diffusion at 2100 °C,and then governed by volume or liquid-phase diffusion at 2200 °C.展开更多
With China’s entry into WTO and the development of the economic globalization, market competition in the construction field is more and more featured by the competition of talents, the core of which is the cultivatio...With China’s entry into WTO and the development of the economic globalization, market competition in the construction field is more and more featured by the competition of talents, the core of which is the cultivation mechanism innovation of higher construction management talents. The approach to meet the requirement of this situation is to adopt innovation ideas, improve the supply-demand structure of CME, reform the education system to relate theory to practice, pay attention to the needs of the educated, enhance global communication and cooperation, and improve the knowledge structure of teachers.展开更多
基金the financial supports from the National Natural Science Foundation of China (No. 51874369)Hunan Provincial Natural Science Foundation, China (No. 2021JJ30856)+1 种基金the China Scholarship Council for financial supports (No. CSC201906370123)the Fundamental Research Funds for the Central Universities of Central South University, China (No. 2020zzts084)。
文摘Dense B;C material was fabricated using spark plasma sintering(SPS), and the densification mechanisms and grain growth kinetics were revealed. The density, hardness, transverse flexure strength and toughness of samples were investigated and the model predictions were confirmed by SEM and TEM experimental observations. Results show that SPSed B;C exhibits two sintering periods: a densification period(1800-2000 °C) and a grain growth period(2100-2200 °C). Based on steady-state creep model, densification proceeds by grain boundary sliding and then dislocation-climb-controlled mechanism. Grain growth mechanism is controlled by grain boundary diffusion at 2100 °C,and then governed by volume or liquid-phase diffusion at 2200 °C.
文摘With China’s entry into WTO and the development of the economic globalization, market competition in the construction field is more and more featured by the competition of talents, the core of which is the cultivation mechanism innovation of higher construction management talents. The approach to meet the requirement of this situation is to adopt innovation ideas, improve the supply-demand structure of CME, reform the education system to relate theory to practice, pay attention to the needs of the educated, enhance global communication and cooperation, and improve the knowledge structure of teachers.
