Carbon solids made of meso-carbon microbeads, (1). Production of carbon solids and their mechanical strength

This paper describes relation between processing conditions for production of carbon solids and their mechanical strength. The meso-carbon microbeads used were Type M and Type P. These microbeads were made by molding without binder pitch under the pressure of 500-3000 kg/cm/sup 2/ at a room temperature. The molding was heat-treated at final temperature of 1000-2800/sup 0/C. Density, weight loss, shrinkage and strength of the obtained carbon solids were measured. The following results were obtained: 1) Carbon solids made of Type M had larger compressive and bending strength than those from Type P which were produced under the same condition. It is suggested that the molding made of Type P was given about duplicate weight loss comparing with that of Type M below 1600/sup 0/C. 2) Bulk density and strength of the carbon solids changed with the molding pressure. These values increased with increasing molding pressure of 500 to 1500 kg/cm/sup 2/, but were constant above 1500 kg/cm/sup 2/. 3) In the molding made of Type P, the rate of heating up to 1000/sup 0/C was most suitable within the range of 120 to 180/sup 0/C/min. 4) Bulk density and strength of carbon solid made of Type M heat-treated at 2800/sup 0/C were 1.92 g/cm/sup 3/ and 1700 kg/cm/sup 2/ (compressive strength), 700 kg/cm/sup 2/ (bending strength). From this result, it is confirmed that the isotopic carbon solids with high density and high strength were preparared from the meso-carbon microbeads.