A study of the pack cemented SiC coating on graphite was perfomed and the process conditions were evaluated by means of experimental design. The content of Si, $P_2O_5$, B and $Al_2O_3$, reaction temperature, reaction time, and acid treatment was tested as the experimental variables. The results were analyzed and compared by the characteristic value of 10% weight loss by oxidation. The acid treatment exhibited the most effective anti-oxidation property and the optimum conditions were the powder composition of 20% Si, 3% B, and 77% SiC, the reaction temperature of 1550℃ for 7 hours with phosphoric acid treatment. The pack coating performed under this condition improved the 10% weight loss temperature by 514℃ compared to the bare graphite.
