Technological methods applied for intensification liquid-glass mixture hardening process are described. Influence of physical and chemical processes at liquid-glass mixtures technological properties are examined. The application of combined methods of hardening the mixture is proposed, as well as examples of such technological processes are given. The effect of combined methods on the technological properties of the mixture is described. The need for more hard research in this area is justified
The basic directions of improvement of properties of silicate binders and mixtures on their basis are generalized. Organic and inorganic additives for liquid-glass mixtures and autoclave modification are considered. A huge number of various additives proposed to improve the knockout rate of liquid-glass mixtures is due to the complexity of the processes occurring in the mixtures at high-temperature exposure. In order to obtain the optimal structure, it is necessary to ensure the presence in the silicate solution of colloidal particles of liquid glass and active functional groups of a polymeric modifier capable of interacting with this surface.
The mechanisms of interaction of various ultradisperse substances with molding materials, as well as their influence on physical and technological properties, are considered. Examples of using of ultrafine nano-sized additives in foundry are given. The possibilities of increasing level of technological properties (initial strength, gas permeability and non-stick properties) of mixtures due to additives of UPC, which contributes the improvement of the surface quality of castings and to the reduction laboriousness of finishing operations are described.
The article presents the results of a study of the effect of vacuuming on the curing processes of liquid‑glass mixtures. The method of conducting experiments using an original laboratory vacuum installation and the mechanisms of curing a liquid‑glass mixture with various hardening methods are described. Studies have shown that vacuuming can signifi antly accelerate the curing and increase the strength of the mixture while reducing the content of the silicate binder. This; in turn; facilitates the knockability of liquid‑glass mixtures and expands the prospects for using these environmental friendly mixtures in foundry as an alternative to sands based on organic binders.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.