Lanthanum microdoped molybdenum alloy wire preparation method

A technology of alloy wire and lanthanum-molybdenum, which is applied in the field of preparation of micro-doped lanthanum-molybdenum alloy wire, can solve the problems of not meeting the requirements of use, low high-temperature strength, easy deformation, etc., and achieve easy control of the production process, good high-temperature performance, and low loss Effect

Active Publication Date: 2007-07-11
JINDUICHENG MOLYBDENUM CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in parts with high temperature performance requirements, such as high temperature lamp support wire, high temperature electric furnace (under gas protection or vacuum) heating elements, molybdenum wire needs to have better high temperature performance, and the recrystallization temperature of pure molybdenum wire is only 1000-1200°C, so brittleness and fracture often occur, and its high-temperature strength is also low and easy to deform, which is far from meeting the requirements of the above industries.

Method used

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preparation example Construction

[0016] The preparation method of micro-doped lanthanum-molybdenum alloy wire, the steps of the preparation process include: a. using ammonium dimolybdate as raw material and adding hydrogen to perform a reduction to obtain molybdenum dioxide; b. 2 o 3 Carry out dissolving standby; Molybdenum dioxide and La(NO 3 ) 3 The solution is doped in a double-cone vacuum drying doping pot; c. The molybdenum dioxide is subjected to secondary hydrogen reduction in a four-tube high-temperature muffle furnace to form a micro-doped lanthanum Mo-La molybdenum powder; d. A micro-doped lanthanum Mo -La molybdenum powder is cold isostatically pressed into alloy rods, pre-sintered and high-temperature sintered to obtain sintered alloy rods; Carry out large-scale drawing to obtain alloy wire; f. Perform high-temperature annealing on alloy wire to eliminate internal stress and carry out mid-plate drawing to obtain alloy wire drawing; g. Alloy wire change drawing is subjected to high-temperature an...

Embodiment

[0019] Take ammonium dimolybdate as the raw material and carry out a reduction with hydrogen to obtain molybdenum dioxide, and take 50kg of molybdenum dioxide for subsequent use; take 13.9gLa by weight percentage 2 o 3 Carry out dissolving standby; Molybdenum dioxide and La(NO 3 ) 3 The solution is doped in a double-cone vacuum drying doping pot. The pressure of the air compressor pump is 0.18MPa, the drying temperature of the doping pot is 90°C, and the vacuum degree inside the doping pot needs to be controlled above 0.7MPa. After mixing, 49.0kg of molybdenum dioxide was obtained; the molybdenum dioxide was subjected to secondary hydrogen reduction in a four-tube high-temperature muffle furnace, and the hydrogen flow rate was 8.0M 3 / H, the boat load is 1.8kg / boat, and the speed of pushing the boat is 2 boats / 45min to obtain 34.5kg of slightly doped lanthanum Mo-La alloy powder; the slightly doped lanthanum Mo-La molybdenum powder is pressed into cold isostatic pressing, A...

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Abstract

The invention discloses a making method of high-temperature metal molybdenum filament with trace lanthanum, which comprises the following steps: reducing molybdenum oxide in the vacuum twice; punching; sintering; rolling; drawing; obtaining the Mo-La alloy filament.

Description

technical field [0001] The invention discloses a preparation method of micro-doped lanthanum-molybdenum alloy wire, relating to a production method of high-temperature metal molybdenum wire, especially a preparation method of micro-doped lanthanum-molybdenum alloy wire Background technique [0002] Because refractory metal molybdenum has high high temperature strength, good electrical and thermal conductivity, low expansion coefficient and easy processing, it is used in special bulbs and electric light source devices such as automotive tungsten halogen lamps, high-pressure sodium lamps, lighting tungsten halogen lamps, etc. Molybdenum wire is widely used to manufacture parts such as bulb hooks, core wires for winding filaments, guide rods, lead-out wires and plastic brackets required for them, and is used as heating wire for hydrogen furnaces in the kiln industry. However, in parts with high temperature performance requirements, such as high temperature lamp support wire, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/04B22F9/26B22F3/16B21C1/00C22F1/18
Inventor 李大成卜春阳陈强王锦
Owner JINDUICHENG MOLYBDENUM CO LTD
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