Molybdenum Crucible in Resistance Furnace

Molybdenum crucible is used in a resistance furnace to increase the lifetime of crucible. While a resistance furnace has the advantage of good temperature control, molybdenum crucible is stiffness at high temperatures, which is benefit for the operation of resistance furnace.

Double-vacuum furnace with molybdenum crucible which contains an inexpensive, removable molybdenum liner to increase life of the crucible. Shutter, shaft-mounted onto a linear actuator with 1 inch of travel. 1.33 inch flange with flex-line connected to analytical vacuum system. 1.33 inch flange equipped with 0.75 inch zero-length viewport for visual examination of funnel assembly. VAT Series 48 all-metal gate valve with sapphire window welded into the valve. Provides for visual examination of crucible floor during sample heating. Shutter shaft-mounted onto a linear actuator with 1" of travel. Shutter is equipped with cup to catch any stray sample grains and a 0.25" diameter in-vacuo mirror. The mirror is mounted to provide viewing access, through a zero-length viewport (similar to 4), to the bottom of the crucible during sample heating. Rotary actuator driven by a DC stepper motor. 1.33" flange on opposite side of drawing. Provides access to non-analytical "roughing" section. Linear actuator driven by a DC stepper motor.

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