Castable moulding mix for producing ceramic facing layers of foundry moulds based on yttrium oxide and a binder containing the aluminium oxide nanoparticles

摘要

the solution is lejna mixture formierska to production of ceramic foundry moulds based on a mixture of powders of different particle size of y2o3 of granulation (200 and 325 mesh) added in the proportion of 50% - 50% by weight, or 35% - 65% by weight, or 65% - 35% by weight, water nanokompoz ytu,containing colloidal al2o3 on the average particle size of 5 nm to 100 nm and a al2o3 content of 40% by weight, a binder of 6% u00f7 15% by volume in relation to the quantity of water nanokompozytu,containing colloidal al2o3 selected from group: wodorozpuszczalny poly (vinyl alcohol) on the degree of hydrolysis of 77 - 88% and a molecular weight of 14000 g / mol - 130000 g / mol, or wodorozcieu0144czalna dispersion polymer poly (acrylic) or poly (uretanowa) about the glass transition temperature of - 60u00b0c to + 120 degrees and the content of the solid phase in the dispersion 16 - 50% by weight, measure antypiennnego of 0010 - 0.075% by volume in relation to the quantity of the two adhesives, wetting agent in a quantity measure 0010 - 0075% by volume in relation to the quantity of the two adhesives, while the proportion of the solid phase is 70 - 85% by weight of a mixture of powders of different particle size of y2o3 of granulation (200 ora of the 325 mesh) added in the proportion of 50% - 50% by weight, or 35% - 65% by weight, or 65% - 35% by weight calculated with equation 1.where: mp - mass of mixture powders of different particle size of y2o3, mr - mass of water nanokompozytu containing colloidal al2o3 and a binder selected from the above group, fl - share% mixture of powders of different particle size of y2o3.the calculation assumes share% mixture of powders of different particle size of y2o3 and the mass of water nanokompozytu containing colloidal al2o3.