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The technology of ceramic mould manufacture for investment casting of titanium alloys
Liquid ceramic slurries of a new generation have been used in the technological process. The composition of the slurries and the method of their preparation were developed basing on the results of investigations of the physical, chemical and technological properties. The said properties were measured on model liquid ceramic slurries of strictly specified granular composition, using a particle size analyser and laser diffractometer. The investigations were carried out on moulding materials (binders and ceramic slurries) of very high thermal stability, reduced reactivity, and well-checked biocompatibility. The application of colloidal solutions, namely, Y2O3, ZrO2 or CeO2 , as water-based binders makes the use of modifying agents necessary. Due to a modification of the binder system, a homogeneous composition, stable physicochemical parameters, the required mechanical strength, and low deformability are obtained. Complying with these different, and often excluding each other, requirements is possible only when the mechanism of physico-chemical effects that occur in the process of ceramic mould making has been thoroughly known and investigated. Complex physico-chemical characteristics of the process of a ceramic mould making have been completed with technological investigations carried out on pilot ceramic moulds. Using selected ceramic mould specimens, the specific nature of interactions in contact with molten titanium alloys has been investigated by the Centre for High-Temperature Studies at Foundry Research Institute in Krakow, using a genuine apparatus operating according to the sessile drop principle in a variant of contact heating of the examined couple of materials, a titanium/mould substrate system. The results of investigations carried out on pilot ceramic moulds and of computer-aided simulation of the mould pouring process served as guidelines in designing of a gating system and parameters of the technological process of the ceramic mould making and pouring. The results of studies were checked in practice making a pilot lot of the ceramic moulds with respective castings.
The technology of ceramic mould manufacture for investment casting of titanium alloys
Liquid ceramic slurries of a new generation have been used in the technological process. The composition of the slurries and the method of their preparation were developed basing on the results of investigations of the physical, chemical and technological properties. The said properties were measured on model liquid ceramic slurries of strictly specified granular composition, using a particle size analyser and laser diffractometer. The investigations were carried out on moulding materials (binders and ceramic slurries) of very high thermal stability, reduced reactivity, and well-checked biocompatibility. The application of colloidal solutions, namely, Y2O3, ZrO2 or CeO2 , as water-based binders makes the use of modifying agents necessary. Due to a modification of the binder system, a homogeneous composition, stable physicochemical parameters, the required mechanical strength, and low deformability are obtained. Complying with these different, and often excluding each other, requirements is possible only when the mechanism of physico-chemical effects that occur in the process of ceramic mould making has been thoroughly known and investigated. Complex physico-chemical characteristics of the process of a ceramic mould making have been completed with technological investigations carried out on pilot ceramic moulds. Using selected ceramic mould specimens, the specific nature of interactions in contact with molten titanium alloys has been investigated by the Centre for High-Temperature Studies at Foundry Research Institute in Krakow, using a genuine apparatus operating according to the sessile drop principle in a variant of contact heating of the examined couple of materials, a titanium/mould substrate system. The results of investigations carried out on pilot ceramic moulds and of computer-aided simulation of the mould pouring process served as guidelines in designing of a gating system and parameters of the technological process of the ceramic mould making and pouring. The results of studies were checked in practice making a pilot lot of the ceramic moulds with respective castings.
The technology of ceramic mould manufacture for investment casting of titanium alloys
Technik der Keramikformherstellung für das Feingießen von Titanlegierungen
Karwinski, A. (author) / Sobczak, N. (author) / Lesniewski, W. (author) / Wieliczko, P. (author)
WFC, World Foundry Congress, 69 ; 592-599
2010
8 Seiten, 22 Bilder, 3 Tabellen, 16 Quellen
Conference paper
Storage medium
English
Keramikformverfahren , Schlamm , Werkstoffentwicklung , Suspension , Yttriumoxid , Zirkoniumdioxid , Cerdioxid , Modifiziermittel , physikalisch-chemische Eigenschaft , physikalisch-chemische Reaktion , Titanlegierung , Benetzbarkeit , mechanische Festigkeit , Maßbeständigkeit , rechnerunterstützte Simulation , Feingießverfahren , Gießsystem , keramisches Bindemittel , Viskosität , Viskosität-Temperatur-Verhalten , Zirkonsand , Rauigkeit , Hochtemperaturbeständigkeit , Biegefestigkeit , Mikrogefüge , Konzentrationsverteilung , Nanoteilchen , Nanopulver , nanokristalline Keramik
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