Abstract:
An ash melting device, wherein a crucible is used for the innermost layer of a furnace body to reduce the wear of a furnace material so as to reduce the size of the furnace body, the crucible is formed in a cartridge for extremely simplified replacement, mainly the mixture of petroleum gas such as propane and butane with oxygen gas or air is used as fuel for perfect combustion and a temperature control is performed sufficiently, and a means is adopted to improve a thermal efficiency by improving the positions of a burner and an ash inlet, whereby the control of the temperature inside the furnace can be facilitated, the wear of the furnace body can be reduced, and the device can be repaired easily and reduced in size.
Abstract:
The invention concerns a tungsten-based sintered material, with relative mean density higher than 93 % and HV0.3 hardness >/= 400. It comprises: tungsten having a purity higher than 99.9 %, an additive consisting of nickel and/or cobalt powder in a mass percentage not more than 0.08 %, an average particle size of tungsten grains of equiaxial shape ranging between 2 and 40 mu m and uniformly distributed for a given average size; and uniformly distributed residual porosity with less than 85 % of the population of pores having a unit volume less than 4 mu m .
Abstract:
A unibody, monolithic, one-piece negative draft crucible (40) for an MBE effusion source (110). The crucible (40) maximizes capacity, uniformity and long-term flux stability, and minimizes oval defects, depletion effects, and short-term shutter-related flux transients. The invention also includes an effusion source (110) employing such a crucible (40), as well as a method and mandrel apparatus (55) for making a unibody containment structure (40), such as a crucible (40) formed of PBN, having a negative draft (46), via chemical vapor deposition.
Abstract:
A unibody, monolithic, one-piece negative draft crucible (40) for an MBE effusion cell. The crucible maximizes capacity, uniformity and long term flux stability, and minimizes oval defects, depletion effects, and short term shutter-related flux transients.
Abstract:
A crucible capable of withstanding high temperatures and receiving materials to be melted, decomposed or generally converted while avoiding any physical or chemical interaction between the material making up the crucible and its contents. The crucible is made of a refractory material and designed to contain high temperature materials, and its inner wall comprises a coating based on a thin layer with a thickness below 10 mu m. The layer is preferably oxide-based and at least the inner wall of the crucible is advantageously made of vitreous silica.
Abstract:
The method provides melting granules of precious metal contained in a graphite ingot mold (2), in a sealed melting chamber (20), by induction heating means (21) and with an inert gas atmosphere instead of air. The solidification of the ingot is carried out by placing the ingot mold (2) on a cooling plate (3) in which a coolant circulates. The cooling plate (3) is situated in a loading/cooling chamber (10) provided to couple and decouple with the melting chamber (20); the solidification phase of the ingot is also carried out while keeping the loading/cooling chamber (10) closed. The device (1) which carries out the method has a box structure (4) to which is cantilevered the melting chamber (20) and to which is pivotably jointed at least one loading/cooling chamber (10). The latter is movable between said coupled and decoupled positions and can be arranged at the side of the melting chamber (20). With the proposed method and device it is prevented the oxidation of the ingot mold (2) and their rapid wear.
Abstract:
Vessels selected from crucibles, pans, open cups and saggars essentially comprising of two components, from which (A) one component being a monolithic ceramic material, (B) the second component being a ceramic matrix composite, and wherein component (A) is the inner part, or inlay.
Abstract:
Casting of iron or steel is performed by assembling a charge (1 ) of plate-like charge elements (1 a, 1 b, 1 c...) with known compositions and dimensions by placing them on top of each other, and of an alloying component entity (2) with known composition, such as alloying component pieces or an alloying component cartridge, by means of which the composition of the charge is balanced to the desired precise composition. The charge is melted in a furnace (5) and cast to form a casting with an exactly known composition.
Abstract:
Procédé et dispositif de traitement d'un métal ou d'un alliage métallique en fusion par une substance additive Procédé et dispositif de traitement d'un métal ou d'un alliage métallique en fusion par une substance additive, dans lesquels la substance additive (37) est déposée dans une cavité locale (10) aménagée au fond d'une poche de traitement (2)et entourée d'un muret en saillie (11), et un organe de fermeture (13) relié à des moyens de déplacement (14) est apte à former avec le fond de la poche de traitement, dans une position basse d'isolement, une chambre (25) incluant ladite cavité locale et comprenant un espace annulaire intermédiaire (25a) autour du muret. Application au traitement d'une fonte en fusion par du magnésium pur ou un alliage de magnésium.