Abstract
In order to prepare carbon-ceramics composites having spherical shape, a powder mixture of carbon and zirconium diboride (ZrB2) was heat-treated at 2400, 2600 and 2800°C. Carbon black, calcined pitch coke and natural graphite were used. Above 2600°C, spherical bodies of silver color, about 20μm-2mm in diameter, were formed for all carbon powders. The spherical body was the spherical composites in the system carbon-ZrB2; the surface was covered with polyhedral graphite and the inside was composed of small graphite and ZrB2 particles. The formation process of the spherical composites is considered as follows: ZrB2 in contact with carbon fuses in the temperature range of 2400 to 2600°C, carbon dissolves in the fused ZrB2, the ZrB2 containing carbon changes into spheres by surface tension, and the carbon dissolved in ZrB2 separates out as graphite during cooling.
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