Boron And Filtering On The Phase Of A356 Alloy Iron

A356 alloy as the wheels'material has been more common, but the impurities are great harm to its casting, Fe element is the most common impurity, almost all the manufacturers take the Fe element as the harmful impurity to control it. In order to reduce the content of Fe element in the aluminum, many scholars and experts around the world have made a lot of research, the maximum amount of impurity Fe in A356 is 0.5%, how to reduce the content of Fe element is worthy of study on.This article from two ways to control the content of Fe element, one way was adding neutralizer, another way was changing the filter parameters. The nertalizer choose that contain boron element. Meanwhile, in order to study the impact of filters on the content of Fe in aluminum alloys, using fiber filters and foam ceramic filters. Also taking into account the pore size of foam ceramic impact on the effect of filter,using a variety of pore size to experiment.Experimental results show that: A356 aluminum alloy was treatmented with boron, made the grain flake growth and the size of grain is refined. The reaction of boron and alloys produced Fe ternary compounds, reducing the content of Fe in aluminum alloy; The best content of adding Borax was 0.5%. This time, the best grain size, iron-like characterized obviously. The content of Fe fell to 0.396% from 0.587%, its rate of removal of iron was 32.5%; the best content of adding Al-B master alloy was 0.04%, the smallest grain size, phase diagram in the acicular phase decreased significantly, almost not observed, the iron content fell to 0.3542% from 0.596%, its rate of remova of iron is 40.57%. The composition and metallographic analysis, removal of iron with adding the borax and the Al-B alloy, the way to add Al-B alloy was better, the most appropriate content of Al-B was 0.04%.Due to boron and Fe produced relatively high density of iron phase compounds, the iron phase removal of the filter, the melt processed by fiber filter and 20ppi, 25ppi, 30ppi ceramic foam filter, the content of iron has reduced to some extent. The XRD of slag by filtering.The composition does contain a lot of FeB2, which affirmed the previous experimental results. The experimental comparison, the iron removal rate of fiber filter, 20ppi, 25ppi, 30ppi ceramic foam filter in aluminum alloy melt without boron treatmented were 15.52%, 17.24%, 25.53%, 29.12%, the iron removal rate of fiber filter, 20ppi, 25ppi, 30ppi ceramic foam filter in aluminum alloy melt with 0.5% borax treatmented were 19.19%, 27.35%, 35.18%, 38.93%. the iron removal rate of fiber filter, 20ppi, 25ppi, 30ppi ceramic foam filter in aluminum alloy melt with 0.04% Al-B treatmented were 23.13%, 29.42%, 54.7%, 58.63%. However, through 35 samples, only two samples through 30ppi ceramic foam filter was successful. So 30ppi pore is not suitable for aluminum alloy melt filter, the success sample because of individual ceramic foam filters had large holes, it have a certain chance, therefore, the most suitable for filtering molten aluminum is 25ppi ceramic foam filter, aluminum alloy melt with 0.04% Al-B filtered by 25ppi ceramic foam filters, the content of Fe in aluminum fell 0.596% to 0.27%, removal rate of iron is 54.7%.