Role of Sand Grains in Sorption Processes by Surface Layers of Components of Sand Moulds
| Autor: | Jerzy Zych, N. Kaźnica |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Surface (mathematics)
Surface layer Materials science 020502 materials Metallurgy Sand grains Metals and Alloys Furan moulding sands Sorption 030206 dentistry 02 engineering and technology Industrial and Manufacturing Engineering 03 medical and health sciences 0302 clinical medicine 0205 materials engineering Castings defects lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials Moisture sorption |
| Zdroj: | Archives of Foundry Engineering, Vol 17, Iss 1, Pp 87-92 (2017) |
| ISSN: | 2299-2944 |
| DOI: | 10.1515/afe-2017-0016 |
| Popis: | The results of researches of sorption processes of surface layers of components of sand moulds covered by protective coatings are presented in the hereby paper. Investigations comprised various types of sand grains of moulding sands with furan resin: silica sand, reclaimed sand and calcined in temperature of 700°C silica sand. Two kinds of alcoholic protective coatings were used - zirconium and zirconium - graphite. Tests were performed under condition of a constant temperature within the range 30 - 35°C and high relative air humidity 75 - 80%. To analyze the role of sand grains in sorption processes quantitavie moisture sorption with use of gravimetric method and ultrasonic method were used in measurements. The tendency to moisture sorption of surface layers of sand moulds according to the different kinds of sand grains was specified. The effectiveness of protective action of coatings from moisture sorption was analyzed as well. Knowledge of the role of sand grains from the viewpoint of capacity for moisture sorption is important due to the surface casting defects occurrence. In particular, that are defects of a gaseous origin caused by too high moisture content of moulds, especially in surface layers. |
| Databáze: | OpenAIRE |
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