The Research of Properties of Experimental Ceramic Layers

Abstract

In the evaporative pattern casting process, the surface of a polystyrene pattern (Styrofoam) is coated with a ceramic layer. This ceramic layer, which coats the evaporative pattern, should have specific physiochemical properties including: resistance to thermal, chemical, and erosive activity of molten metal and proper permeability for gases which are produced by the evaporative polystyrene pattern. The article presents the research results of properties of experimentally selected ceramic layers applied on a polystyrene pattern in the evaporative pattern casting process.Keywords: evaporative patterns, Lost Foam, ceramic layer, properties W procesie wytwarzania odlewów wg metody modeli zgazowywanych na modele polistyrenowe (styropianowe), nakładana jest warstwa pokrycia ceramicznego. Pokrycie ceramiczne, które jest nanoszone na model zgazowywany powinno charakteryzować się określonymi właściwościami fizykochemicznymi w tym: odpornością na termiczne, chemiczne i erozyjne działanie ciekłego metalu oraz odpowiednią przepuszczalnością gazów wytworzonych z zgazowywanego modelu polistyrenowego. W artykule przedstawiono wyniki badań własności, wytypowanych doświadczalnych powłok ceramicznych, nanoszonych na model polistyrenowy w procesie modeli zgazowywanych.

Archives of Foundry Engineering

“…For ceramic mould with molochite R, K = 0,46 [cm 4 /G‧min] -after two recycling cycles. In the previous studies has been established that for K <0,2 [cm 4 /G‧min] we can obtain a cold shot type casting defect [7,8,9]. The results are the average of two types of conducted studies.…”

“…The dimensional accuracy and the surface quality are the primary objective in this manufacturing technology. Ceramic moulds dimensional distortions are the reason of approximately 60% of overall errors of the casting manufactured mainly with the use of aluminosilicates [2,3]. Based on the quality of the castings the amount of the ceramic moulds with aluminosilicates has increased at least 40% of the global investment casting production compared to moulds based on the S i O 2 .…”