An investigation of the mechanical property and thermal shock behavior of machinable B4C/BN ceramic composites

作者：Jiang Tao^*; Jin Haiyun; An Zhihao; Yang Jianfeng; Qiao Guanjun

来源：Journal of Ceramic Processing Research, 2009, 10(1): 113-116.

• Boron carbide
• Boron nitride
• Mechanical property
• Thermal shock resistance
• Machinability

Machinable B4C/BN ceramic composites were fabricated by a hot-pressing process at 1,850 degrees C for 1 h under a pressure of 30 MPa. In this article, the mechanical property, thermal shock behavior and machinability of the B4C/BN ceramic composites were investigated. The fracture strength and fracture toughness of B4C/BN nanocomposites were significantly improved in comparison with B4C/BN microcomposites. The Vickers hardness of B4C/BN nanocomposites; and B4C/BN microcomposites decreased gradually with an increase in the content of h-BN, while the machinability Of B4C/BN nanocomposites and B4C/BN microcomposites were significantly improved. The B4C/BN ceramic composites with an h-BN content of more than 20 wt% exhibited excellent machinability. The thermal shock resistance of the B4C/BN ceramic composites was much better than that of the B4C Monolith, and the thermal shock resistance of B4C/BN nanocomposites was much better than that of B4C/BN microcomposites. The thermal shock temperature difference (Delta Tc) of the B4C monolith was about 300 degrees C, while the Delta Te of B4C/BN microcomposites was about 500 degrees C and the Delta Tc of B4C/BN nanocomposites was about 600 degrees C.

• 出版日期2009-2
• 单位西安交通大学