| 摘要 |
The invention concerns a mineral composition for preparing foundry moulds, comprising (a) from 20 to 90 % by weight of gypsum, (b) from 10 to 80 % by weight of a mineral component made from silica and/or alumina, and (c) from 0.5 to 4.8 %, and preferably from 1.5 to 4.5% by weight, and in particular between 2 and 4.5 % by weight, of a mineral powder having a thermal conductivity (lambda), at 20 °C, greater than 15W/(m.K) and a specific surface area greater than 10 m2/g, these percentages being relative to the total weight of the sum of components (a), (b) and (c). |
