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Wpływ powłoki Al2O3 na przebieg utleniania stopu Ti-46Al-7Nb-0,7Cr-0,1Si-0,2Ni na osnowie fazy [gamma] -TiAl

Małecka J.

Ochrona przed Korozją

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2011

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nr 12

670-674

PL

Przedstawiono wyniki utleniania izotermicznego stopu Ti-46Al-7Nb-0,7Cr- 0,1Si-0,2Ni na osnowie fazy międzymetalicznej [gamma] -TiAl z naniesioną powłoką Al2O3. Utlenianie przeprowadzono w atmosferze powietrza w temperaturze 900oC i 950°C. Stwierdzono, iż naniesiona powłoka powoduje obniżenie szybkości utleniania i przyczynia się do mniejszych przyrostów masy.

EN

Test results of isothermal oxidation of a [gamma] -TiAl intermetallic phase based Ti-46Al-7Nb- 0,7Cr-0,1Si-0,2Ni alloy coated with Al2O3 are presented. Oxidation was carried out under an air atmosphere at 900oC and 950°C. It was determined that the Al2O3 coating is very effective in reducing the oxidation rate of [gamma]-TiAl.

2

Cost reduction of TiAl by alternative production and integration of TiAl scrap recycling - concepts and vacuum-metallurgical equipment

Lochbichler C., Friedrich B., Jarczyk G., Scholz H.

Advances in Materials Science

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2008

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Vol. 8, nr 1(15)

67-74

EN

Due to high corrosion resistance and low density titanium alum in ides show a great potential as material for structural applications in the aerospace and automotive industry. However the high actual production costs for semi-finished products slow down a break through to mass production of TiAl. Current research projects at IME, Aachen funded by AIF "Otto von Guericke" and BMBF aim on cost reduced production methods of TiAl and on the minimisation of downgrading TiAl scrap. This article presents firstly the state of the art of TiAl production by vacuum arc (re)melting (V AR) or induction skull melting (ISM). A comparison of new process routes under special consideration of recycling issues will follow. Innovative processing and equipment concepts are shown by intelligent combination of well known vacuum melting and remelting processes such as vacuum induction melting, specialized using ceramic lining and deoxidisation with e.g. electro slag remelting (ESR). For each process step and accordingly equipment the metallurgical opportunities are pointed out and the way to make use of them within the process route is described. Requirements on input material and final metal quality addicted to the processing route and refining techniques with their adjustment in respect to TiAl are mentioned. Selected results of laboratory and pilot scale experiments done at IME in Aachen and equipment needs therefore are shown.

3

Cost reduction of TiAl by alternative production and integration of TiAl scrap recycling - concepts and vacuum-metallurgical equipment

Lochbichler C., Friedrich B., Jarczyk G., Scholz H.

Advances in Materials Science

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2007

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Vol. 7, nr 4(14)

81-88

EN

Due to high corrosion resistance and low density titanium aluminides show a great potential as material for structural applications in the aerospace and automotive industry. However the high actual production costs for semi-finished products slow down a break through to mass production of TiAl. Current research projects at IME, Aachen funded by AIF "Otto von Guericke" and BMBF aim on cost reduced production methods of TiAl and on the minimisation of downgrading TiAl scrap. This article presents firstly the state of the art of TiAl production by vacuum arc (re)melting (VAR) or induction skull melting (ISM). A comparison of new process routes under special consideration of recycling issues will follow. Innovative processing and equipment concepts are shown by intelligent combination of well known vacuum melting and remelting processes such as vacuum induction melting, specialized using ceramic lining and deoxidisation with e.g. electro slag re-melting (ESR). For each process step and accordingly equipment the metallurgical opportunities are pointed out and the way to make use of them within the process route is described. Requirements on input material and final metal quality addicted to the processing route and refining techniques with their adjustment in respect to TiAl are mentioned. Selected results of laboratory and pilot scale experiments done at IME in Aachen and equipment needs therefore are shown.