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Puffing inhibitors for coal tar based needle coke

✍ Scribed by K. Fujimoto; M. Sato; M. Yamada; R. Yamashita; K. Shibata

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 442 KB
Volume: 24
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(86)90258-7

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✦ Synopsis

The efficiency of various puffing inhibitors has been studied systematically using carbon samples prepared from coal tar based needle coke. Puffing was reduced by the addition of nickel and cobalt oxides. The bulk density of moulded blocks subjected to graphitization was increased also by the addition of these oxides, because of their catalytic ability for carbonization. No sulfide was observed during the graphitization process, implying that puffing inhibition is not necessarily due to the reaction of metals with sulfur compounds in cokes. The interlayer spacing of needle cokes mixed with effective puffing inhibitors was considerably decreased during graphitization. The action of puffing inhibitors seems to change the timing between the gas evolution and the softening of carbon bodies.

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