Author:
Brůna Marek,Vasková Iveta,Galčík Marek
Abstract
The main problem during the production of castings from aluminium alloys is the presence of the reoxidation, which negatively affects the final casting quality. Liquid metal surface reacts with the surrounding atmosphere and oxide layer of Al2O3 is formed on its surface. The problem occurs when the oxide layer is entrained to the internal volume of the melt by turbulence and double oxide layers are formed, also known as “bifilms”. Its formation is related to the melt velocity and gating system design. In paper, naturally pressurized gating system was calculated and designed. Effect of the filter media and vortex element on the melt velocity, amount of oxides, mechanical properties, and porosity were observed. Designs with 10 ppi and 20 ppi foam filters and vortex element were compared with design without filters to prove the positive (or negative) effect of filter media on melt velocity and thus on final casting quality. The melt velocity and amount of oxides were observed with the aid of simulation software. Mechanical properties, quantity of pores, bifilm index and EDX analysis were evaluated after experimental casts. It was proven that by using 20 ppi foam filter in combination with vortex element, the best results were achieved.
Funder
Kultúrna a edukačná grantová agentúra MŠVVaŠ SR
Subject
Process Chemistry and Technology,Chemical Engineering (miscellaneous),Bioengineering
Reference30 articles.
1. Effect of Molybdenum and Cobalt Addition on Structure and Mechanical Properties of Aluminium-12.5%Silicon Alloy;Nwambu;Int. J. Eng. Sci. Invent.,2014
2. The Behaviour of Bifilm Defects in Cast Al-7Si-Mg Alloy
3. Oxide bifilm defects in aluminum alloy castings
4. Refining aluminium-alloy melts with graphite rotors
5. Nové trendy vo výrobe hliníkových odliatkov pre automobilový priemysel;Hajdúch;Slevárenství,2020
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献