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Aluminum alloy impact sparkling

Dudyk M., Płonka S.

Archives of Foundry Engineering

2008

Vol. 8, iss. 3s

21--26

The cast machine parts are widely used in many branches of industry. A very important issue is gaining the appropriate knowledge relating to the application of castings in places of explosion risks including but not limited to mining, chemical industry and rescue works. A possibility of explosion risks occurrence following the impact sparkling of the cast metal parts is still not solved problem in scientific research. In relation to this issue, in this article, the results of the study are presented, and relating to the tendency to impact sparkling of the aluminium alloys used in machine building. On the grounds of the results obtained, it was demonstrated that the registered impact sparkles bunches of feathers from the analyzed alloys: AlSi7Mg, (AK7); AlSi9Mg, (AK9); AlSi6Cu4, (AK64) and AlSi11, (AK11) show significant differences between each other. The quantitative analysis of the temperature distribution and nuclei surface area performed on the example of the alloy AK9 (subjected to defined period of corrosion) allows for the statement that they are dangerous in conditions of explosion risk. Following this fact, designers and users of machine parts made from these materials should not use them in conditions where the explosive mixtures occur.

Percussive sparking of metals

Dudyk M.

Archives of Foundry Engineering

2007

Vol. 7, iss. 4

197-201

The paper presents the results of research on sparking sensitivity of metals used for casting machine parts. The research concerns on the recording of dynamics of percussive sparking on the research stand designed and made by author. The research stand enables analogue and digital recording of the percussive sparks pictures. The research on percussive sparking was performed on single and multiple smears made of aluminium (AlSi9Mg, (AK9); AlSi11, (AK11)) and magnesium (AlMg9, (AG9)) alloys as well as St3 steel. The results are presented as pictures of sparks differing in shape and size as well as temperature distribution. It was shown that the sparks with the biggest area of plume occur for AK9 alloy and the biggest area of spark nucleus occur for AK11 alloy. The sparks registered for St3 steel have very small area of the plume and nucleus. The characteristics and thermal properties determined for the registered percussive sparks may be of use for designers and users of machine parts manufactured from these materials.