Abstract
In the present communication, effect of boron carbide particle size on the mechanical properties such as hardness, fracture toughness and flexural strength of reaction bonded boron carbide (RBBC) ceramics were investigated. RBBC composites were produced by the reactive infiltration of molten silicon into porous preform containing boron carbide and free carbon. Boron carbide powders with mean particle size of 18.65μm, 33.70μm and 63.35μm were chosen for the RBBC composites. The experimental results show that hardness increases from 1261.70±64.74kg/mm2 to 1674.90±100.00kg/mm2 and fracture toughness drops from 5.76±0.26MPam1/2 to 3.4±0.37MPam1/2. However, flexural strength decreases from 403.41±5.70MPa to 256.15±25.05MPa with the increase in particle size. Indentation induced cracks in RBBC are mainly median type and number of cracks increase with the increase of starting particle size.
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