| 초록 |
Fully densified boron carbide usually achieved through costly hot pressing techniques, however, even in a fully dense form, low toughness remains a major limitation. To improve the toughness of boron carbide, aluminum phase, which has a low melting point and low specific gravity, was introduced into boron carbide by melt infiltration method. This method makes possible to produce the composite maintaining hardness and strength closely to original value of boron carbide with low cost. The processing temperature is also lower in compared with general hot pressing method. Boron carbide preforms were prepared by uniaxial pressing and then heat treated in vacuum to control their strength and porosity. Aluminum melt was infiltrated into boron carbide preform using the capillary force derived by porous preform. The infiltrated preform was heat treated to produce a tailorable microstructure. The effects of the processing parameter on the mechanical properties will be discussed. |
