SOLUTION-BASED METHOD OF PRODUCING SILICON CARBIDE MIXTURE WITH OXIDE SINTERING ACTIVATOR AND METHOD OF PRODUCING CERAMIC BASED THEREON Russian patent published in 2012 - IPC C04B35/565 

FIELD: chemistry.

SUBSTANCE: invention relates to production of composite material based on silicon carbide and composite oxide binder, capable of operating in aggressive media, as well as in conditions with impact-dynamic loads, specifically as material for friction pairs and protective armour articles. The solution-based method of producing silicon carbide mixture with an oxide sintering activator, involving deposition onto the surface of silicon carbide particles α-SiC of a sintering activator containing 3.7 wt % magnesium oxide MgO, 24.7 wt % yttrium oxide Y₂O₃ and 71.6 wt % aluminium oxide Al₂O₃. Deposition is carried out on α-SiC particles dispersed in aqueous solutions of nitrates of magnesium, yttrium and aluminium, by depositing Mg²⁺ ions onto 1/3 part of α-SiC, taken in form of a suspension in aqueous solution of sodium hydroxide NaOH, and a mixture of Y³⁺ and Al³⁺ ions on 2/3 part of α-SiC, taken in form of a suspension in aqueous solution of ammonium hydroxide NH₄OH, wherein deposition of said ions is carried out in form of hydroxides with subsequent thermal decomposition thereof to oxide forms at T=400-700°C, and by mixing, a mixture is obtained which contains 0.24-0.55 wt % MgO, 2.50-3.71 wt % Y₂O₃, 7.20-10.76 wt % Al₂O₃ and α-SiC - the balance.

EFFECT: high strength, density and hardness of articles with low porosity thereof.

2 cl, 2 ex, 1 tbl, 2 dwg