Technological properties and the peeling ability of water-base bauxite coating for EPC were examined. Crack easily occurs in the corner of patterns with bauxite coating after drying

resulting in the difficulty of peeling off from the castings as a result of the adhesion with coating after pouring liquid steel. The crack resistance of the coating layer can be greatly improved by introducing organic fiber A into ingredient of the coating. With only 1% organic fiber A addition

crack in the corner of the pattern can be obviously eliminated

and the coating behavior and strength are improved

however

with the content of organic fiber A more than 1.5%

uneven coating thickness can be observed as a result of easily flow down in process of brushing. The peeling behavior of coating after poured can be improved with adding a metal oxide B which could accelerate sintering

where with 4%

6

% addition

coating exhibits desirable peeling behavior

so smooth castings surface can be observed. However

with metal oxide B content more than 8%

surface of the castings is adhered by a layer powder with occurrence of sand burning.