PROCESS FOR MANUFACTURE OF COMPOSITE CERAMIC MATERIAL Russian patent published in 1994 - IPC

FIELD: civil engineering; manufacture of composite ceramic materials. SUBSTANCE: this novel process for manufacture of composite ceramic material is characterized in that base metal is heated to temperature higher than its melting point but lower than melting point of resultant oxidizing reaction product, molten base metal is allowed to contact with filler stock in presence of oxidant, molten base metal is reacted with oxidant to yield oxidizing reaction product, at least part of resultant oxidizing reaction product is repeatedly contacted with molten base metal and oxidant to enable molten base metal to gradually migrate towards oxidant through oxidizing reaction product to produce oxidizing reaction product inside filler stock on surface parting oxidant and previously formed oxidizing reaction product. Disclosed process is further characterized in that prior to contacting molten base metal with filler stock, latter is enclosed in envelope made from alloy having thermal expansion coefficient greater than that of composite ceramic material and composed of inner reticular spacer and outer rigid cylinder. Aluminum or any other metal selected from group including silicon, titanium, tin, zirconium and hafnium may be employed as base metal. Oxygen-containing gas, in particular, air may be used as oxidant and aluminum oxide as oxidizing reaction product. Disclosed process prescribes heating aluminum to temperature of 850 to 1450 C. Oxidant may be used either in vapor or solid or liquid phase. This process further prescribes that oxidant in either solid or liquid phase be introduced into filler and molten base metal be reacted with oxidant in either solid or liquid phase to produce at least part of polycrystalline oxidizing reaction product. Component selected from group including silicon dioxide, boron and reducible metal borides may be employed as solid oxidant and component selected from group including silicon dioxide, silicon carbide, aluminum oxide, zirconium dioxide and magnesium aluminate may be used as filler. In case oxidant is used in vapor phase, material permeable for oxidant in vapor phase may be employed as envelope material and filler. Envelope is to be made of material containing metal selected from group including stainless steel, Inconel alloy, Hastalloy, Fecral, Fecralloy and Incalloy. EFFECT: excellent qualities. 10 cl