The influence of the conditions of gypsum plaster preparation on its technological properties

• Autorzy: Pawlak M.
• Języki publikacji: EN

Abstrakty

EN

The results of researches on influence of basic preparation parameters, i.e. time and mixing intensity, start and end time of set, dimensional changes and strength of gypsum plaster, are presented in this paper. Determination of mentioned above parameters has a significant meaning because of their influence on quality of gypsum plaster and its susceptibility to even small disturbances during preparation. Tested plaster was prepared in vacuum mixer St. LOUIS 82. Time of mixing was 60÷360 sec., mixer arm rates 150÷420 rpm. It was demonstrated that mixing time influences strongly the setting time and expansion of gypsum plaster , and this influence growths with growing mixing intensity. The intense, short time mixing is beneficial from the viewpoint of dimensional changes minimizing. Minimizing the setting time is the most beneficial at low mixing intensity but significant dimensional changes appear during setting the plaster.

Słowa kluczowe

EN

modern casting materials; modern castings technologies; precision casting; grypsum mould

PL

materiały odlewnicze; technologie odlewnicze; odlewnictwo precyzyjne; forma gipsowa

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 2
• Strony: 95--98
• Opis fizyczny: Bibliogr. 11 poz., fot. wykr.

Twórcy

autor

Pawlak M.

• Department of Materials Technologies and Production Systems, Technical University of Lodz, 1/15 Stefanowskiego Str, 90-924 Łódź, Poland

Bibliografia

• [1] Lewandowski L.: Moulding Materials. AKAPIT, Warszawa 1997 (in Polish).
• [2] Nelson C.D.: Plaster Molding, Metal Handbook, Vol. 15, Casting, (1988), s. 242÷247.
• [3] Pawlak M., Niedźwiedzki Z.: Computer aided process of dimensional distortion determination of bounded plaster plaster, Part II. Archives of Foundry Enginerring, Vol. 10, Issue 1, January – March 2010, p. 105÷108.
• [4] Pawlak M., Niedźwiedzki Z.: Computer aided process of dimensional distortion determination of bounded plaster plaster. Archives of Foundry Engineering, Vol. 9, Issue 3, July – September 2009, p. 261÷266.
• [5] Pawlak M., Niedźwiedzki Z.: Dilatometric studies of plaster plaster in raw and heat treated state. Archives of Foundry Engineering, Vol. 8, Issue 3, July – September 2008, p. 145÷148.
• [6] Pawlak M.: Influence of temperature and time of firing on the properties of gypsum. Polska Metalurgia w latach 2002-2006, Komitet Metalurgii Polskiej Akademii Nauk, Kraków 2006 (in Polish).
• [7] Pawlak M.: The firing gypsum mould for artistic casting. Archiwum Odlewnictwa, PAN, 2006, Nr 19, s. 213÷220 (in Polish).
• [8] Pawlak M.: The preliminary baking gypsum moulds for artistic casting. Archiwum Odlewnictwa, PAN, 2005, Nr 17, s. 225÷232 (in Polish).
• [9] Service manual of mixer St. LOUIS 82 B/P by CIMO S.R.L.
• [10] Folder of Hoben International Ltd., 2007.
• [11] PN-86/B-04360 Spoiwa gipsowe. Metody badań. Oznaczanie cech fizycznych.