超高温陶瓷制备与性能研究.pdfVIP

Int. Journal of Refractory Metals and Hard Materials 29 (2011) 351–355 Contents lists available at ScienceDirect Int. Journal of Refractory Metals and Hard Materials jour nal homepage : www. elsevier. com/ locate/IJRMHM Fabrication, mechanical properties and thermal shock resistance of a ZrB2-graphite ceramic Wang Zhi, Wu Zhanjun ⁎, Shi Guodong School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, P.R. China a r t i c l e i n f o a b s t r a c t Article history: A ZrB ceramic containing 25 vol.% graphite flake (ZrB -graphite) ceramic was fabricated by hot-pressing at 2 2 Received 6 December 2010 1950 °C. It was shown that the fracture toughness was significantly improved due to the addition of graphite Accepted 31 December 2010 flake whereas the flexure strength and hardness were slightly reduced. The increase in fracture toughness was attributed to the presence of soft graphite flake and weaker interface bonding. The decrease in the flexural Keywords: strength was due to the increase in weakening factors such as the weaker bonding within the ZrB2-graphite Ceramics Microstructure ceramic and lower load transfer since the lower mechanical property of the graphite flake as well as graphite Mechanical properties