炭素-二ホウ化ジルコニウム球状複合体の調製と微構造

概要

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In order to prepare carbon-ceramics composites having spherical shape, a powder mixture of carbon and zirconium diboride (ZrB_2) was heat-treated at 2400, 2600 and 2800℃. Carbon black, calcined pitch coke and natural graphite were used. Above 2600℃, 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-ZrB_2 ; the surface was covered with polyhedral graphite and the inside was composed of small graphite and ZrB_2 particles. The formation process of the spherical composites is considered as follows : ZrB_2 in contact with carbon fuses in the temperature range of 2400 to 2600℃, carbon dissolves in the fused ZrB_2, the ZrB_2 containing carbon changes into spheres by surface tension, and the carbon dissolved in ZrB_2 separates out as graphite during cooling.
社団法人日本セラミックス協会の論文
1995-03-01