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Analiza wybranych właściwości utwardzanych mikrofalowo mas formierskich wiązanych spoiwami na bazie skrobi

Kaczmarska K., Grabowska B., Drożyński D.

Archives of Foundry Engineering

2014

Vol. 14, iss. 4 spec.

51--54

Celem przeprowadzonych badań było określenie wybranych właściwości utwardzonych mikrofalowo mas formierskich ze spoiwami na bazie skrobi. Efektywność wiązania ziaren osnowy określono w oparciu o wyniki oznaczenia płynności, przepuszczalności, ścieralności oraz wytrzymałości na zginanie i rozciąganie masy utwardzonej. Dokonano wstępnej oceny zasadności mikrofalowego utwardzania mas formierskich zawierających samodzielne spoiwa skrobiowe w postaci natywnej skrobi ziemniaczanej Superior Standard oraz komercyjnego produktu Albertine F/1.

The aim of the study was to determine the properties of the moulding sands with binders consist of starch. The efficiency of binding of the sand grains was determined based on the results of the determination of liquidity, permeability, abrasion resistance and flexural strength and tensile strength of the microwave-cured moulding sands. There was made a preliminary assessment of the merits of microwave curing prepared moulding with a binder in the form of a native potato starch as Superior Standard and commercial product as Albertine F/1.

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

Pawlak M.

Archives of Foundry Engineering

2010

Vol. 10, iss. 2

95--98

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.