Method for the production of pencil leads and pencil leads produ

Details Method for the production of pencil leads and pencil leads produ Method for the production of pencil leads and pencil leads produ

1987-09-03

1988-07-19

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 17, 501 22, 501133, 106 19, C03C 389, C03C 3108, C04B 3514, C04B 3552

Patent

active

047585404

ABSTRACT:
The invention is concerned with the production of pencil leads and also pencil leads as produced by the proposed method. In accordance with the invention, graphite, enamel frit and quartz flour, preferably at least approximately in a ratio of one part of graphite, two to four parts of enamel frit and one part of quartz flour, are processed to form a starting mixture which is then pressed into the form of a lead, is dried and is fired. The invention renders it possible to perform sintering below a temperature of 550.degree. C. and, accordingly, to perform the sintering firing operation in a normal oxidizing atmosphere.

REFERENCES:
patent: 3732115 (1973-05-01), Lankard et al.

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