DEPENDENCE OF TENSILE WET STRENGTH FROM REGENERATION TIME AND GRAIN SIZE OF THE MATRIX CERAMIC MOULDS
DOI:
https://doi.org/10.7494/mafe.2011.37.1.53Keywords:
foundry, ceramic mould, matrix, temperatureAbstract
Production technology of nwestment casting involves transmitting the elements of shape, dimensions and properties by filling in the appropriate liquid metal ceramic forms reproduced by a model made of wax removed by melting it. The manufacturing process of inwestment casting in the lost wax technology consists of a number of technological operations: preparing of wax models and their assembling in the model units, the preparation of ceramic mixture, successive layers of debris, wax melting in an autoclave, drying the samples at 100 °C, heating the samples at temperatures ranging from 400 to 700 °C. So far, the technology was based on the use of ceramic mixture, which the bond was hydrolysed ethyl silicate. Currently, due to environmental protection and improvement of working conditions, more and more binders with alcohol is replaced with an aqueous solution of colloidal silica. In the study, to create the individual layers a ceramic form, used regenerated ceramic mixture derived from foundry and green ingredients. The regeneration time was respectively 5 and 15 minutes. Used ceramic moulds after mechanical reclamation was given to sieve analysis to determine the grain size (di). Grain sizes 0.2, 0.4 and 0.63 mm were used for the coating of ceramic moulds. The paper presents results of research aimed at the determination of the relationship between tensile wet strength and grain size of ceramic mould: Rm = f[dL). Tests were conducted on cylindrical samples, which deposited the layers of reclaimed ceramic material.
Downloads
References
Dańko R., Kamińska J. Assessment of the reclamation of used sands from the alpha-set technology in the testing apparatus, Archives of Foundry Engineering, 9 (2009) 1, 33-37
Holtzer M. Materiały II Sympozjum Naukowego Wykonawców PBZ-MNiSW-03/1/2007, Rzeszów, 15-16.12.2009 (not published)
Kamińska J., Kolczyk J., Żymankowska-Kumon S.: Wpływ wielkości ziarna regeneratu form ceramicznych stosowanych w technologii wytapianych modeli na ich wytrzymałość w stanie na wilgotno, Sesje Studenckich Kół Naukowych, Materiały XLVII Sesji Pionu Hutniczego, 1/2010 Kraków
Kamińska J., Kolczyk J., Żymankowska-Kumon S. Effect of grain size of the reclaimed ceramic moulds used in the lost wax technology on the strength at high temperaturę, 13th International Symposium of Stu-dents and Young Mechanical Engineers „Advances in Chemical and Mechanical Engineering", Gdańsk 2010, pp. 192-197
Kamińska J., Kolczyk J., Żymankowska-Kumon S. Effect of grain size of the reclaimed matrix ceramic moulds used in the lost wax technology on the strength at high temperaturę, Metallurgy and Foundry Engineering, 36 (2010) 1,31-35
Lewandowski J.L.: Materiały formierskie. Laboratorium, Wydawnictwo AGH, Kraków, 1997
Lewandowski J.L.: Tworzywa na formy odlewnicze, Wyd. Nauk. „Akapit" Kraków, 1997
SarekD. Opracowanie metodyki badania właściwości technologicznych nowych, ekologicznych tworzyw stosowanych na formy ceramiczne w WSK „PZL-Rzeszów" S.A., AGH, Kraków, 2005 (praca magisterska, niepublikowana)
Zych J:. Koncepcja badania wytrzymałości powłok ceramicznych stosowanych w technologii pełnej form i wytapianych modeli, Wydawnictwo XII Międzynarodowa Konferencja Naukowo-Techniczna Odlewnictwa Metali Nieżelaznych, Iwonicz, 4-6 czerwca 2009
