Furnaces molybdenum wire

Its high melting point also makes it useful for metal electrodes in glassmaking furnaces. Molybdenum s high resistance to electricity makes it useful in high-temperature filament wires and in the construction of parts for missiles, spacecrafts, and nuclear power generators. 

Sintering is commonly carried out in molybdenum-wire resistance-heated furnaces under hydrogen or nitrogen mixtures (dissociated ammonia) but can also be performed in vacuum units. The use of wet hydrogen has become industrial practice to suppress hydrogen embrittlement (water vapor porosity) [6.29]. The temperature/time program of the sintering cycle must be adjusted to the composition and size of the sintered parts. A... 

A sintered clay boat is charged with pure CaCNg, either alone or with an added amount (somewhat below the calculated value) of well-charred sugar charcoal or acetylene black. The boat is inserted into a ceramic tube (inside diameter 30 mm., length 500 mm.). The tube is provided with a groimd stopper at one end and sealed at the other. It is connected to a high-vacuum system and heated by means of an electric furnace with a molybdenum wire winding to temperatures above 1350°C. 

Mad] Thermal analysis, light microscopy, chemical analysis of layers. Armko Fe and electrolitic Cu. The alloys were melted in a vertical molybdenum-wire furnace in an atmosphere of cracked ammonia. Alloys with 50 mass% Cu and Fe and fiom 0.05 to 2.0 mass% C. Stable C-Cu-Fe diagram, miscibiUty gap, the compositions of two Uquid layers at 1150°C (invariant monotectic equiUbrium), temperature and constitution of critical point on the miscibiUty curve. 

Initiation was either by heating the base of the bomb in a furnace or by means of an electrically heated molybdenum wire buried in the charge. 

A new high temperature probehead has been constmcted for NMR measurements up to 900 K. The rf-coil made firom molybdenum wire of 0.5 mm diameter is fixed on a boron nitride cylinder which is located inside the furnace tube. The sample volume which is detected by the NMR coil is 10 mm in diameter and 15 mm in height. The furnace consists of a molybdenum wire resistance heater noninductively wound on an alumina tubing. A dc power supply has been used to avoid parasitic signals. The whole system is placed inside a water cooled vacuum recipient fitting into the cryomagnet. For recent reviews on high temperature NMR techniques see e.g. [11,12]. 

Experiments were carried out in a tube furnace, with sample size 23-25mm. Two kinds of coke were charged in a molybdenum wire cage into the furnace, with an iron plate separating the coke in the middle, as shown in Fig 1. The sample was heat with protection of N2, with volume rate 0.8L/min, and when reached 1100°C, N2 was replaced by CO2, with volume rate 3L/min until end of the reaction. When reaction was over, the furnace was cooled down to room temperature with protection of N2, with volume rate 2L/min. Samples were weighted when cooled down to room temperature, and weight loss ratio of coke was selected as index of reactivity Cioss ... 

Incandescent Lamps, Electronic Tubes, and Resistance Elements. Articles fashioned in any form from molybdenum and tungsten usually fall within the bounds of powder metallurgy. These metals normally are first produced as a powder. Both molybdenum and tungsten are used as targets in x-ray tubes, for stmctural shapes such as lead and grid wires in electron tubes, and as resistance elements in furnaces. 

The same properties that make molybdenum metal effective in high temperature furnace appHcations make it useful as support wires for tungsten filaments in incandescent light bulbs and as targets in x-ray tubes. 

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