Rare Earth Molybdenum Alloy

Rare earth molybdenum alloy and preparation method thereof

It involves a molybdenum alloy wire used for parts in special bulbs and electric light source devices, metalworking cutting wires and heating wires in kilns, and preparation methods.

Because the refractory metal molybdenum has high-temperature strength, good conductivity, thermal conductivity, low expansion coefficient, and ease of processing, molybdenum wire is widely used in special bulbs and electric light source devices such as automotive tungsten halogen lamps, high-pressure sodium lamps, lighting tungsten halogen lamps, and electric light source devices to manufacture the bulb hooks, core wires around the filament, guide rods, lead wires and plastic brackets, etc. which are widely used as wire-cut molybdenum wires in the metal processing industry and used as heating wires for hydrogen furnaces in the kiln industry. However, in the parts with high-temperature performance requirements, such as high-temperature lamp bracket wire, high-temperature electric furnace (under gas protection or vacuum) heating element components need molybdenum wire to have good high-temperature performance, pure molybdenum wire recrystallization temperature is only 1000 ~ 1200 °C, so often brittleness and fracture, its high-temperature strength is also low and easy to deform, far from meeting the above industry requirements. This is due to the fact that the recrystallization grains grow at this time and form an equiaxial grain structure after recrystallization. In the metalworking industry, the need for wire cutting molybdenum wire has high strength, high wear resistance, low plasticity, long service life, and other properties, compared with pure molybdenum wire low strength, poor wear resistance, high plasticity, short service life, can not meet the needs of users in the machinery industry.

A rare earth molybdenum alloy with good processing performance, high tensile strength, high recrystallization temperature, strong wear resistance, simple process, not easy to bend and brittle, high yield, good material consistency, and long service life.

A rare earth molybdenum alloy, characterized by the alloy of the wire containing La2O3 and Y2O3 two rare earth oxides, the two rare earth oxides accounted for the total weight percentage of the alloy is 0.4% to 1.0%, and the weight ratio of La2O3:Y2O3 is 4:1.

It is characterized by the fact that the preparation process is sequential

a. Ammonium dimolybdate as raw material hydrogenation gas for a reduction to obtain molybdenum dioxide;

b. According to the design composition of alloy wire La2O3 and Y2O3 two rare earth oxides, dissolved with nitric acid;

c. Molybdenum dioxide and La(NO3)3, Y(NO3)3 solution are doped uniformly under vacuum, and dried to obtain doped molybdenum dioxide powder;

d. The doped molybdenum dioxide is reduced by secondary hydrogen to obtain doped molybdenum powder;

e. The doped molybdenum powder is pressed by cold isostatic pressing into rare earth doped molybdenum rod;

f. The rare earth doped molybdenum rod is pre-sintered at a temperature of 1250 °C for 1 hour; then sintered at a high temperature of 1900 °C for 6 hours to obtain a sintered molybdenum rod;

g. The sintered doped molybdenum rod is opened at a temperature of 1650 °C; the secondary rolling blank is carried out at a temperature of 1250 °C to obtain a rolled molybdenum rod;

h. The rolled molybdenum rod is pulled into a large plate into a wire; then the drawn wire is kept and annealed at a temperature of 1250±50 ° C for 30 min; After eliminating the internal stress, the middle disc is pulled to obtain Mo-La-Y rare earth doped wire.

Rare earth molybdenum alloy, contains two rare earth oxides, La2O3 and Y2O3; Compared with pure molybdenum, the high-temperature performance of the product is good, the recrystallization temperature is high, and it is 300~500 °C higher than pure molybdenum, which has excellent properties such as high strength, high wear resistance, low plasticity, and long service life, and has a wide range of applications in the machining industry.

The preparation method herein, different from the traditional powder metallurgy production process, is carried out in the molybdenum dioxide stage of double cone vacuum drying liquid-solid doping, and then carried out a secondary reduction to prepare binary rare earth doped molybdenum powder, and then prepared by pressing, sintering, pressure processing, and other processes to prepare the specifications of 0.5 ~ 0.8mmMo-La-Y rare earth doped molybdenum wire.

The raw materials are cheap and easy to obtain, and the prepared molybdenum wire has high tensile strength, strong wear resistance, a simple process, is not easy to bend and brittle, has a high yield rate, good consistency, and long service life. The source is ammonium dimolybdate, and the additives La2O3 and Y2O3 used are inexpensive and have no harm to the operator's body; The production process is easy to control, easy to operate, safe and reliable, and there is no need for large investment and transformation on the equipment, which is suitable for large-scale production; Compared with the liquid-solid doping method and the solid-solid doping method, the distribution of the added alloying elements in the material is uniform, and the product consistency is good; The pressure processing technology used is two rolled blanks, compared with the rotary forging blank process, the loss of the product is low, and the fiber structure is obvious.

The main specifications and dimensions of molybdenum alloy processing materials:

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