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无机材料学报 1997
Strengthening and Toughening of B4C-TiB2 Multiphase Ceramics
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Abstract:
B4C-TiB2 composites were prepared by hot-pressing process at 2050°C. The effects of TiB2 particlecontent on the fracture toughness, bending strength and Vickers hardness of B4C-TiB2 composites werestudied. The addition of 3Ovol% TiB2 raised the bending strength of B4C to the peak value of 725MPa, 65%higher than monolithic B4C. An 84% increase of composite toughness up to 6.7MP.m1/2 was discoveredupon the incorporation of 45vol% TiB2 particles into B4C matrix. The crack deflection caused by theresidual stress resulting from the difference in thermal expansion coefficient between B4C and TiB2 is the main mechanism responsible for the increase of toughness.
