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Degradation of gypsum mold materials
Since millions of pounds of plaster are used in the whiteware industry each year, an increase in the lifetime of the mold by 10 % would result in a tremendous savings for whiteware companies. It was hypothesized for this study that ions present in solution accelerate the dissolution of gypsum, resulting in the change in the casting behavior. Therefore, it was the goal of this study to determine what caused the degradation in the casting behavior of the mold, which would allow the lifetime of the mold to be extended. To increase the lifetime of the gypsum molds, the ionic strength of the water entering the mold needs to be reduced so as to decrease the dissolution rate of the gypsum. Also, by reducing the concentraion of magnesium ions and unadsorbed polyacrylic acid present in the water entering the mold, the life of molds can be extended because these two species cause the highest rate of dissolution of all the salts tested in this study.
Degradation of gypsum mold materials
Since millions of pounds of plaster are used in the whiteware industry each year, an increase in the lifetime of the mold by 10 % would result in a tremendous savings for whiteware companies. It was hypothesized for this study that ions present in solution accelerate the dissolution of gypsum, resulting in the change in the casting behavior. Therefore, it was the goal of this study to determine what caused the degradation in the casting behavior of the mold, which would allow the lifetime of the mold to be extended. To increase the lifetime of the gypsum molds, the ionic strength of the water entering the mold needs to be reduced so as to decrease the dissolution rate of the gypsum. Also, by reducing the concentraion of magnesium ions and unadsorbed polyacrylic acid present in the water entering the mold, the life of molds can be extended because these two species cause the highest rate of dissolution of all the salts tested in this study.
Degradation of gypsum mold materials
Verwitterung des Formengipses
Schulz, B.M. (author) / Carty, W.M. (author)
Ceramic Engineering and Science Proceedings ; 19 ; 87-98
1998
12 Seiten, 8 Bilder, 3 Tabellen
Article (Journal)
English
Gips , Schlickergussform , Alterung , Löslichkeit , Kation , anorganisches Salz , Wasser , Anion , Röntgenbeugung , Magnesium , Ion , organische Säure
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