Magnesium melt protection
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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Light Metals Technology 2015. ed. / Hilda K. Chikwanda; Silethelwe Chikosha. Trans Tech Publications Ltd, 2015. p. 78-81 (Materials Science Forum; Vol. 828-829).
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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TY - CHAP
T1 - Magnesium melt protection
AU - Hort, Norbert
AU - Wiese, Börn
AU - Dieringa, Hajo
AU - Kainer, Karl Ulrich
N1 - Conference code: 7
PY - 2015
Y1 - 2015
N2 - Mg especially in the molten state is well known for its high affinity to O2. When O2 content of the atmosphere is larger than 4%, molten Mg will burn! To avoid this, melt protection is necessary. At present mostly SF6 is used during primary production and processing of Mg and its alloys. Unfortunately SF6 is a very potent greenhouse gas that is > 23,000 times more effective than CO2. This also affects life cycle considerations e.g. for the use of Mg alloys in transportation. However, other protective gases like SO2 or fluorinated hydrocarbons like HFC134a, Novec 612, or AMCover (=HFC134a) have been suggested to replace SF6. Additionally fluxes mixed from different salts may be used again as well to protect molten Mg. But fluxes and feasible replacements of SF6 also have disadvantages. Moreover SF6 and other fluorinated hydrocarbons are under discussion especially in Europe. There is an existing EU legislation that will ban SF6 from 2018 and there are similar discussions regarding all other fluorinated hydrocarbons. Due to this, new innovative ways have to be found or old methods have to be renewed to allow Mg industries further safe processing of molten magnesium. This contribution will report the state of the art in protecting molten Mg and alternatives to the use of SF6.
AB - Mg especially in the molten state is well known for its high affinity to O2. When O2 content of the atmosphere is larger than 4%, molten Mg will burn! To avoid this, melt protection is necessary. At present mostly SF6 is used during primary production and processing of Mg and its alloys. Unfortunately SF6 is a very potent greenhouse gas that is > 23,000 times more effective than CO2. This also affects life cycle considerations e.g. for the use of Mg alloys in transportation. However, other protective gases like SO2 or fluorinated hydrocarbons like HFC134a, Novec 612, or AMCover (=HFC134a) have been suggested to replace SF6. Additionally fluxes mixed from different salts may be used again as well to protect molten Mg. But fluxes and feasible replacements of SF6 also have disadvantages. Moreover SF6 and other fluorinated hydrocarbons are under discussion especially in Europe. There is an existing EU legislation that will ban SF6 from 2018 and there are similar discussions regarding all other fluorinated hydrocarbons. Due to this, new innovative ways have to be found or old methods have to be renewed to allow Mg industries further safe processing of molten magnesium. This contribution will report the state of the art in protecting molten Mg and alternatives to the use of SF6.
KW - Fluorinated hydrocarbons
KW - Flux
KW - Melt protection
KW - SF
KW - SO
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84954559369&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.828-829.78
DO - 10.4028/www.scientific.net/MSF.828-829.78
M3 - Article in conference proceedings
AN - SCOPUS:84954559369
SN - 9783038355625
T3 - Materials Science Forum
SP - 78
EP - 81
BT - Light Metals Technology 2015
A2 - Chikwanda, Hilda K.
A2 - Chikosha, Silethelwe
PB - Trans Tech Publications Ltd
T2 - 7th International Light Metals Technology Conference, LMT 2015
Y2 - 27 July 2015 through 29 July 2015
ER -