Foundry Coatings: A ReviewPages 45-53
Gergana Milanova Abstract:
The main purpose of this review is to present the historical development of the foundry industry and its importance for the engineering sector. The paper also discusses sand casting technology, with special emphasis on no-bake chemically hardened moulding systems. Auxiliary materials used for the production of sand moulds and cores are reviewed, particularly refractory coatings with graphite fillers because of their wide industrial application. The main chemical and physical parameters of refractory coatings are discussed, together with the need to investigate their geometrical and tribological characteristics and their influence on casting quality. Previous work by the author has included investigations of microhardness, roughness, friability and gas permeability of refractory coatings, while limited information on similar tests has been found in the literature. The research was supported by PhD project No. 222PD0005-05, Technical University of Sofia, Bulgaria. Keywords: Foundry, Metal casting, Sand moulds, No-bake process, Graphite, Coatings, Refractory
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