Interakce tekutého kovu s cementovou formovací směsí

INTERACTION BETWEEN LIQUID METAL AND FOUNDRY CEMENT MOULD

conference proceedings

en

. Technologies and materials used in industry are still more influenced by ecological aspects and demands. In foundries, the use of resins as a binder in moulds worsens the working conditions due to toxic combustions products emitted during pouring. The second serious problem is the needed recyclability of the used moulds, because until now, 50% of this material is disposed. This paper presents the results of the investigation of new hydraulically setting binders in foundry moulds with contact of liquid iron. These binders based on Alumina and Portland cements are environmentally friendly and exhibiting admirable performance. Methodology of trials was designed and its attestation was implemented in experimental and working conditions. In the interface between cement sands and liquid metal were certified generation of complex allied substances – on the base of Si, Fe, Al and Ca. In many cases compounds of sulphur, which are dangerous and could change the shape of graphite nodules in the surface layers of castings have been found. All these particles are illustrated by SEM microscopy. The mathematical model of mechanical penetration has been created and proved influence of the temperature and chemical composition of grey iron on the range of penetration in the experimental moulds. The research and development of these inorganic binders for the foundry use will be the solution for future of no waste technologies.

Problematika ekologického využití formovacích směsí je stále aktuální. Více než 50% použitých formovacích směsí je stále vyváženo na skládky a jsou tedy z ekologického hlediska nepoužitelné. Práce se zabývá možností využití cementových směsí pro výrobu forem a interakcemi kovu s formou na bázi portlandského a hlinitanového cementu.

. Technologies and materials used in industry are still more influenced by ecological aspects and demands. In foundries, the use of resins as a binder in moulds worsens the working conditions due to toxic combustions products emitted during pouring. The second serious problem is the needed recyclability of the used moulds, because until now, 50% of this material is disposed. This paper presents the results of the investigation of new hydraulically setting binders in foundry moulds with contact of liquid iron. These binders based on Alumina and Portland cements are environmentally friendly and exhibiting admirable performance. Methodology of trials was designed and its attestation was implemented in experimental and working conditions. In the interface between cement sands and liquid metal were certified generation of complex allied substances – on the base of Si, Fe, Al and Ca. In many cases compounds of sulphur, which are dangerous and could change the shape of graphite nodules in the surface layers of castings have been found. All these particles are illustrated by SEM microscopy. The mathematical model of mechanical penetration has been created and proved influence of the temperature and chemical composition of grey iron on the range of penetration in the experimental moulds. The research and development of these inorganic binders for the foundry use will be the solution for future of no waste technologies.

Iron, Casting, Mould, Cement, Sand, Interaction

18.06.2009

Zagreb

978-953-7082-08-6

Proceedings Book

120–130

10