Graphite and boron carbide composites made by hot-pressing |
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Authors: | Kenji Miyazaki Tsuyoshi Hagio Kazuo Kobayashi |
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Affiliation: | (1) Government Industrial Research Institute, Kyushu Shuku-machi, Tosu-shi, 841 Saga, Japan |
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Abstract: | Composites consisting of graphite and boron carbide were made by hot-pressing mixed powders of coke carbon and boron carbide.
The change of relative density, mechanical strength and electrical resistivity of the composites and the X-ray parameters
of coke carbon were investigated with increase of boron carbide content and hot-pressing temperature. From these experiments,
it was found that boron carbide powder has a remarkable effect on sintering and graphitization of coke carbon powder above
the hot-pressing temperature of 2000° C. At 2200° C, electrical resistivity of the composite and d(002) spacing of coke carbon
once showed minimum values at about 5 to 10 wt% boron carbide and then increased. The strength of the composite increased
with increase of boron carbide content. It was considered that some boron from boron carbide began to diffuse substitutionally
into the graphite structure above 2000° C and densification and graphitization were promoted with the diffusion of boron.
Improvements could be made to the mechanical strength, density, oxidation resistance and manufacturing methods by comparing
with the properties and processes of conventional graphites. |
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