Yevtushenko N. Theoretical and Technological Bases for Making and Using Ecologically Pure Cold-Solidifying Mixtures for Molds and Cores on Oligofurfuralxylaxane Bindings.

The dissertation work solves the scientific and technical problem including theoretical and technological bases for making and using ecologically pure bindings and compositions of cold-solidifying mixtures for molds and cores preserving the indices of their main physical, mechanical and technological properties, creating the technology of their preparation as well as obtaining high quality castings made of cast iron, steel and non-ferrous metals. A new ecologically-pure oligofurfuralxylaxane binding for cold-solidifying mixtures based on the reeterification products of ethylsilicate and furfural spirit is developed and proposed. The levels of main properties of such a cold-solidifying mixture on oligofurfuralxylaxane bindings, namely strength, stability, gas making capability, gas pene-tration, breaking, refractoriness and beating that the quality of castings depends on while casting into the sand mold are determined. The effect of different acid catalyzes and their concentration is defined and the degrees of pitch polymerization on main physical and mechanical characteristics of cold-solidifying mixtures based on oligo-furfuralxylaxane bindings are estimated as well. Main characteristics of mixtures on treated sand and the behaviour of cold-solidifying mixtures on oligofurfuralxylaxane bindings in the thermodestruction process have been studied. Mathematical models of molding-mixture properties based on oligofurfuralxylaxane bindings are developed, the domain of their optimal values is defined and the nomogram that describes the correlation between technology parameters and molding-mixture properties is proposed. Main results of the work done are introduced into production.