Studies on the Manufacturing of Carbon Bond Graphite Crucible

,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 13(1); 1976 > Article

Journal of the Korean Ceramic Society 1976;13(1): 11.

카아본 본드형 흑연 도가니 제조에 관한 연구

김충일, 김문수

대두요업(주)

Studies on the Manufacturing of Carbon Bond Graphite Crucible

ABSTRACT

This study was focused on the improvement of production techniques of small crucibles in relation with the appropriate selection of raw materials, various batch compositions and physical and chemical characteristics of the crucibles. Various tests gave the optimum batch composition for the carbon bond graphite cructble as follows: Pyontaek graphite flake (refractory aggregate) : 40Part Silicon carbide: 15Part Tar pitch (binder) : 11Part Inorganic additives (to improve the oxidation resistance) : 15 Part Cryolite : 3 Part Ferro manganese : 2 Part Ferrosilicon : 25 Part Crucibles pressed with 400kg/$textrm{cm}^2$ at 12$0^{circ}C$. and fired in reducing atmosphere at 120$0^{circ}C$ brought the most favorable results as follows: Bulk density : 2.31 Apparent density : 2.58 Porosity : 15.2% Oxidation loss at 1, 50$0^{circ}C$. for 3 hrs : below 3.77% Water absorption : 6.01% Compressive strength : 438kg/$textrm{cm}^2$ Tensile strength : 256kg/$textrm{cm}^2$.