Impact of Protective Release Coatings with Nanopowders on the Quality of Bronze Castings Surface

Abstract

In work are submitted data of casting mold coverings with nanopowders application for molding lead bronze. Influence of a structure of used protective - separating coating of a foundry core on a microstructure of castings was investigated. For experimental work following coverings (the patent No 2297300) a mix dioxide zirconium nanopowder with industrial oil, and the same structure, but already on a basis on oxide aluminum nanopowder have been chosen. It is shown that these coverings application leads to decrease in quantity of surface defects, the roughness of a cast surface decreases. At the same time penetration of particles of a powder from a foundry covering in casting doesn't occur.

Influence of Phase Composition on Properties of Corundum-Zirconium Ceramic

“…Taking into account the formation of the solid solution of substitution for ZrО 2 -3 mol. %Y 2 O 3 and the data of phase analysis, X-ray density proved to be equal to 5.83 g/сm 3 .…”

“…At heating above (1000 -1200)°С, γ-Аl 2 О 3 transforms irreversibly into α-corundum. The density of γ-Аl 2 О 3 is 3.65 g/сm 3 .…”

“…A number of articles concerning the study of corundum-zirconium ceramic have been published in Russian and foreign literature [1][2][3][4]. A more detailed research in this field was done by Pliner et al [5].…”

Methodological Aspects of Evaluation of Foundry Technologies Effectiveness

“…In particular, the cooling rate can be quite easily affected by alteration of "the material, heating or cooling of the casting mould. In this case the influence of this factor, exerted on the structure and properties, frequently appears to be highly significant" [3].…”

Structure and Properties of Multicomponent Bronze Depending on the Crystallization Conditions

“…A number of technological factors, such as, pouring temperature (heat content of the melt), heat-retaining capacity of the mould (cooling rate), rotational velocity of the casting mould (in case of centrifugal casting), pouring rate of the melt into the mould, mould temperature, and some other factors, simultaneously influence the formation of the structure and properties of tin bronze castings. The results of the study [1][2][3][4] show that the property formation of tin bronzes greatly depends on the temperature of the poured melt and mould thermal conductivity.…”