Abstract
dc:descriptionThe development of the foundry technology in the last years is shaped by the equilibrium between economics and ecology. The quality requirements to the castings, like good surfaces, dimensional stability and minimization of the sand induced defects, have to be fulfilled. On the other hand economical (binder costs) and environmental conditions thereby should not be ignored. Regarding the variety of materials applied in the foundry such as silica sand, bentonite, lustrous carbon former, organic binder systems etc. shows that the quantity and the variety of the developed pollutants must be many times larger. These can occur during the entire production process. In the context of this thesis fundamental chemical aspects of the pollutant formation from core and moulding sand systems on a laboratory scale were investigated. The steps during the casting process were simulated with the help of simple experimental arrangements. In these experimental arrangements the thermal stress of defined quantities of core and moulding sand took place. The pyrolysis products developing thereby were detected and characterized by chemical analytics. In a first step based on the spectrum of emitted pyrolysis products the connections between the chemistry of the macromolecular binder systems and their decomposition behaviour was qualitatively described. This part served to answer to the questions “What can develop?”(emission potential of the binder) and “What part of it really develops?” (type of the emitted or absorbed materials). The reaction-kinetic approach to the pyrolytical processes in core and moulding sands supplied a picture of the temporal and mechanistical proceeding of the emission and absorption of the pollutants. The questions about the moment of developing pollutants (“When develops it?”) and about their formation mechanisms (“How develops it?”) can be answered thereby. Finally the obtained results were expressed in a mathematical form. This enables quantification and comparability of the binder and process parameters. Structures and patterns of the experimental data record were worked out by the application of statistical methods.
Degree
thesis:*- Grantor dc:publisher
- Shaker
- Year dc:date
- 2002
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Spang, Smaranda Alexandra
- Contributors dc:contributor
-
- Sahm, Peter R.
Subjects
dc:subject × 8Rights
dc:rights- Statement dc:rights
-
- info:eu-repo/semantics/openAccess
- Language dc:language
- ger
Identifiers
dc:identifier.*- OAI identifier oai:identifier
- oai:publications.rwth-aachen.de:56973