| 摘要 |
1447721 Ceramic bodies resistant to thermal stress GROUPEMENT POUR LES ACTIVITES ET AVANCEES 31 Jan 1974 [9 Feb 1973 16 April 1973] 04661/74 Heading B2E [Also in Divisions Cl and H2] An element, e.g. of a pump for moving liquid metal e.g. Al 2 in which thermal stresses are reduced, comprises a refractory core 1', a surface provided with grooves 53, 54, 61 or covered with refractory plates arranged non- contiguously to provide grooves therebetween and a filling for the grooves which is more compressible than the refractory core material and impermeable to the molten metal. The core matrial is preferably ceramic as are the plates, the plates being less dense than the core. The plates may be adhered to the core with a mixture of a ceramic binder and alumina and/or silica fibres. The filling may be compacted fibres of alumina and/or silica. Slots may end in borings e.g. 51, 52, 60. When grooves are formed on the surface of the core, the surface spaces between the grooves may be covered with non-contiguous plates which form further grooves. |
