Preparation of B4C/(Al,Si) composite through melt infiltration technique
Date Issued
2014
Date
2014
Author(s)
Hou, Chun-Yi
Abstract
Due to the superb properties such as high hardness, low density, high melting point and high elastic modulus, boron carbide has been applied in armor, rocket, and neutron absorption layer. However, the usage of boron carbide is limited due to its high densification temperature and low fracture toughness. These problems can be coped with by adding metallic phase, such as aluminum. In the present study, the use of Al-12%Si mixed powders to infiltrate into porous B4C powder compacts is explored. The effect of infiltration temperature, time and the Si addition on the phase content, microstructure, mechanical properties and thermal conductivity is investigated.
The results indicate that nearly fully dense composites can be manufactured through the infiltration technique. The infiltration temperature is higher than 1100oC. The phase content of composites depends strongly on the infiltration temperature and time. Both fracture toughness and flexural strength increase with the decrease of infiltration temperature. On the contrary, the hardness is decreased with the decrease of infiltration temperature.
Subjects
碳化硼
鋁
熔滲法
複合材料
機械性質
Type
thesis
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