摘要:
The invention concerns a core-type furnace whereof vertical sectors (20) of a crucible lateral wall are assembled at a position adjustable and invariable by screws (36) engaged in internal threads of a flange (34) common to all the sectors, thereby producing an accurate assembly which does not give rise to internal deformation or stresses. The sectors are coated with a ceramic layer to protect them and prevent electric arc formation. The ridges joining the surfaces (28, 29) are rounded for similar effect. The water boxes for cooling the furnace lower hearth are similarly constructed. The invention is applicable to vitrification techniques.
摘要:
The invention relates to a device consisting of a casting vessel (1) having a heatable, refractory lining and an outer metal jacket for receiving molten metal material, especially aluminum molten materials, and a ladle furnace (2) with a magnetic coil (5), wherein the casting vessel (1) is releasably placed on the stationary ladle furnace (2). According to the invention, the metal jacket of the casting vessel (1) has several openings (13) in the form of slits in the lower area.
摘要:
The invention relates to a device consisting of a casting vessel (1) having a heatable, refractory lining and an outer metal jacket for receiving molten metal material, especially aluminum molten materials, and a ladle furnace (2) with a magnetic coil (5), wherein the casting vessel (1) is releasably placed on the stationary ladle furnace (2). According to the invention, the metal jacket of the casting vessel (1) has several openings (13) in the form of slits in the lower area.
摘要:
Es wird ein Induktionstiegelofen mit einem hohlzylinderförmigen Tiegel (1), einer den Tiegel teilweise ummantelnden Ofenspule (3) und mehreren gegen die Ofenspule gepreßten magnetischen Rückschlüssen (4) parallel zur Ofenachse vorgeschlagen, der einen quader-, insbesondere kubusförmigen Ofenkörper in Käfigbauweise aufweist. Der Ofenkörper besteht aus einem aus mindestens vier Stäben (6,7,8,9) rechtwinklig zusammengesetzten oberen Rahmen, einem aus mindestens vier Stäben (14,15,16,17) rechtwinklig zusammengesetzten unteren Rahmen und mindestens einer Säule (10,11,12,13) an jeder Ecke zur rechtwinkligen Verbindung beider Rahmen zu einem Quader, insbesondere Kubus. Die Pressung der magnetischen Rückschlüsse (4) gegen die Ofenspule (3) erfolgt lediglich über den biegesteifen oberen bzw. unteren Rahmen.
摘要:
A method of of preparing samples for XRF using a flux and a platinum crucible includes forming the flux into a free-standing crucible liner. This may be achieved by mixing lithium borate particles with a liquid to form a paste; placing the lithium borate paste onto the inner surface of a mould; and after drying removing from the mould and firing the lithium borate paste to dry the lithium borate to form a free-standing crucible liner. The liner may be placed within a platinum crucible and then a sample placed in the liner. The temperature of the crucible is raised to a sufficient temperature that any oxidation reaction takes place before taking the temperature above the melting temperature of the flux to melt the crucible liner and dissolve the sample into the flux. The crucible can then be cooled and XRF measurements made on the sample.
摘要:
In a known composite material with a fused silica matrix there are regions of silicon-containing phase embedded. In order to provide a composite material which is suitable for producing components for use in high-temperature processes for heat treatment even when exacting requirements are imposed on impermeability to gas and on purity, it is proposed in accordance with the invention that the composite material be impervious to gas, have a closed porosity of less than 0.5% and a specific density of at least 2.19 g/cm3, and at a temperature of 1000° C. have a spectral emissivity of at least 0.7 for wavelengths between 2 and 8 μm.
摘要:
The invention relates to an induction melting furnace comprising shell (7) and a lower sole (11) forming the main part of the structure. In addition, the furnace comprises a removable inner crucible (1) formed by an inner layer (4) that is resistant to heat and to the aggressive nature of the molten bath (20), an outer layer (6) defining the crucible, and an intermediate insulating layer (5). The crucible (1) is a single-use crucible and can be stored, together with its charge, in a suitable container. Heat losses are low, even if the shell (7) is cooled. In addition, stresses due to differential thermal expansions are also very low.
摘要:
The invention concerns a core-type furnace whereof vertical sectors (20) of a crucible lateral wall are assembled at a position adjustable and invariable by screws (36) engaged in internal threads of a flange (34) common to all the sectors, thereby producing an accurate assembly which does not give rise to internal deformation or stresses. The sectors are coated with a ceramic layer to protect them and prevent electric arc formation. The ridges joining the surfaces (28, 29) are rounded for similar effect. The water boxes for cooling the furnace lower hearth are similarly constructed. The invention is applicable to vitrification techniques.
摘要:
In a known composite material with a fused silica matrix there are regions of silicon-containing phase embedded. In order to provide a composite material which is suitable for producing components for use in high-temperature processes for heat treatment even when exacting requirements are imposed on impermeability to gas and on purity, it is proposed in accordance with the invention that the composite material be impervious to gas, have a closed porosity of less than 0.5% and a specific density of at least 2.19 g/cm3, and at a temperature of 1000° C. have a spectral emissivity of at least 0.7 for wavelengths between 2 and 8 μm.