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Journal of Applied Sciences
  Year: 2009 | Volume: 9 | Issue: 11 | Page No.: 2115-2122
DOI: 10.3923/jas.2009.2115.2122
 
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Naturally-Pressurized Running Systems: The Role of Ceramic Filters

Hatef Hashemi and Ramin Raiszadeh

Abstract:
In this research, the detailed flow behaviour of liquid metal through a ceramic filter in a naturally-pressurised running system has been studied by direct observation of the metal flow through a glass window in the mould wall. The effect of the ceramic filter on the formation of double oxide film defects in the running system and the reliability of the castings produced were also investigated by Weibull statistical analysis. The results showed that the ceramic filter has a critical role in the reduction of the velocity and surface turbulence of the liquid metal and hence the creation of double oxide film defects in the naturally-pressurised running system. The reduction in the melt velocity was measured to be about 50%. It was shown that if the cross section of the runner is increased more than that which is necessary to keep the metal naturally-pressurised in the running system, a considerable amount of double oxide film defects form after the filter and this considerably reduces the reliability of the castings produced.
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How to cite this article:

Hatef Hashemi and Ramin Raiszadeh, 2009. Naturally-Pressurized Running Systems: The Role of Ceramic Filters. Journal of Applied Sciences, 9: 2115-2122.

DOI: 10.3923/jas.2009.2115.2122

URL: https://scialert.net/abstract/?doi=jas.2009.2115.2122

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