Abstract:
The microstructure and morphology as well as the bonding fracture of coating-sand interface are investigated by using sweeping electron microscope (SEM) and electronic probe analyzer (EPA) methods. According to the analysis results, an intermediate layer of resin is proposed as a measure to enhance stress CS. The results show that it can raise the bonding ratio and ideal strength therefore increase stress CS significantly. Fracture analysis shows that the bonding destruction happen inside the intermediate layer, therefore chemical cross-linking agents such as glycerin are used to enhance the cohesive strength of the polyacrylic acid intermediate layer. Consequently, stress CS get a further growth.
Key words:
Foundry Accurate shaping Non-occupying coating Core making
* This project is supported by Technical Development Foundation of Machinery Industry (No.97JA0407).
Selected from Proceedings of 2000 the First International Conference on
Mechanical Engineering. revised manuscript May 28, 2001
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