Keush D. Core mixture with inorganic binders and combined filler for the manufacture of castings from iron-carbon alloys

Scientific and practical issues of the development of core mixtures of phosphoric acid and combined fillers of different classes are resolved. In the thesis patterns of influence the components on properties of the mixtures and implementation the technological process that provides increase quality of castings from iron-carbon alloys are established. Phosphoric acid by heating can form with oxides of amphoteric (Al, Zr) and acidic (Si) elements the corresponding phosphates that due to the peculiarities of their structure are inorganic binders in core mixture are established. The new methods of receiving of aluminum phosphates by the interaction the Н3РО4 with aluminum-containing materials of various classes, including with inorganic salts are also presented. The structure, phase composition and thermal analysis developed binders are investigated. The optimal methods for preparing core mixtures with various combined fillers are determined. With the use of methods of planning experiments and data processing the optimum compositions and the modes of strengthening core mixtures are established.