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Optimization of Properties of Disposable Patterns in the Application for Ceramic Molds

Biernacki R., Haratym R., Bałkowiec A., Matysiak H., Kurzydłowski K.

Archives of Foundry Engineering

2014

Vol. 14, iss. 1 spec.

63--66

Presentation of various disposable patterns variants in order to obtain accuracy in investment casting with particular focus on hard waxes. The analysis covered disposable patterns based on hard waxes, paraffin-stearic blends with addition of polyethylene wax and high density polystyrene.

Recycling process of casting molds applying to precision castings

Drajewicz M., Pytel M.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 2

661--667

Purpose: The present work relates to investigations about the possibility of recycling and producing sinters from ceramic molds. These molds are applied for producing precise single crystal casts of nickel based superalloys to elements witch are applied to the hot section of aircraft jet engines. Design/methodology/approach: The processes of milling were carried out using the vibratory mill Herzog HSM 100H and the planetary grinder Pulverisette 7 - Fritsch Company. The measurements of all kinds of powders were conducted by using of the Kamika IPS U Analyzer and Malvern Nanosizer-ZS. To the purpose of analysis of the chemical composition an X-ray microanalysis technique was applied with the dispersion of the energy (EDS) using of Thermo and Noran equipment. Findings: On the basis of examinations carried out on the powders before and after processes of milling and after processes of pressing and sintering of powders, it is possible to state that technological processes of reuse and further applying of used molds are possible. Processes of pressing were conducted applying different amounts of powders. Powders were pressed both without the addition as well as with the addition of modifiers which were added to basic powder in appropriate amounts. It was found that processes of pressing and sintering in both cases showed good results. Surfaces of pressed and sintered tablets were smooth and not-delaminated as well as did not shell. Research limitations/implications: Results will be used for future researches among others concerning the research on mechanical and thermal properties. Practical implications: Waste products and their reuse, recycling and especially consolidation of dangerous and hazardous compounds including of ceramic materials from foundry industry, will have an important place in the future on account of problems with their recycling and the storage. Originality/value: Researches on new possibilities of the application and properties of waste materials.