METHOD OF PRODUCING SILICALESS CERAMIC MOULDS FOR PRECISE METAL INVESTMENT CASTING Russian patent published in 2011 - IPC B22C9/04 

FIELD: process engineering.

SUBSTANCE: proposed method comprises producing the mould, applying, layer-by-layer, of refractory suspension on ceraceous mould. Said suspension is based on pulverised alundum as a filler and organoaluminium compound as a binder. Then, the layer of alundum-based granular material is applied thereon. Ceramic mould layers are dried in chamber with moisture content of, at least 95% of first layer for 1 h, second layer for 3 h, the other layer for 4-6 hours with subsequent convective drying of each layer. Ceramic mould is incinerated at 1000-1350°C for 4-6 hours. Alkoxy-aluminoxane oligomers are used as binder with general formula: RO{[-Al(OR)-O-]_x[-Al(OR*)-O-]_y}_zH, where z=3÷100; x+y=1; R*/Al=0,05÷0,95; R=C_nH_2n+1; n=1÷4; R*=C(CH₃)=CHC(O)C_nH_2n+1.

EFFECT: higher heat resistance and strength.

1 tbl, 1 ex