Studies on Manufacture of electric Carbons XI.

Abstract

A natural flake graphite, “CB-150”, ash content 1.43%, treated with HF and heated to 2600°C. Its ash content became zero by chemical analysis, trace of B, however, detected yet by spectral analysis.The graphites, original and treated, did not altered their crystal lattice constants, similar to the values previously reported by Bacon and other authors. Densities of the grahites by pycnometer method with C6H6, however, observed too high, as 2.29, while as 2.26 with C Cl4.Heating temperature-oxydation loss curves of the graphites by thermobalance method were also obtained. Their shapes had been altered to steeper formes by decreasing ash contents of the qraqhite. The shape of the curve of pure graphite quite resembled to a highly graphitised soot brush.