What Is Molybdenum Lanthanum Alloy?
Lanthanum molybdenum molybdenum alloy with the matrix in the matrix in the presence of dispersed particles of lanthanum oxide consisting of the alloy. La2O3 alloy content is generally 0.5% to 5.0% (mass fraction).
Molybdenum lanthanum alloy History
Molybdenum has a high melting point, excellent high temperature properties, good electrical conductivity, thermal conductivity, etc., is an important high-temperature structural materials. However, since molybdenum plastic brittle transition temperature is relatively high, the high temperature (above the recrystallization temperature) around room temperature with a molybdenum back Shique serious brittleness. To this end, researchers at home and abroad adding rare earth molybdenum done a lot of research, results in adding rare earth molybdenum, you can refine the grain, reducing molybdenum plastic brittle transition temperature, increase the recrystallization temperature of molybdenum, high temperature strength, improved toughness and high temperature creep ductility.
The study found that adding a small amount of lanthanum oxide greatly improves the mechanical properties of molybdenum, lanthanum high temperature heat treatment at room temperature, molybdenum material is liquid nitrogen temperature have excellent strength and toughness. But in the plastic deformation and heat treatment behavior of lanthanum oxide is not sufficient. In recent years, the western refractory material plant on lanthanum molybdenum alloy for a lot of tests on the powder, pressing, sintering, sheet and plate rolling performance were studied systematically.
Preparation of molybdenum lanthanum alloy billets
By liquid - solid mixing, lanthanum oxide La (NO3) 3 solution in the form of alcohol doped molybdenum powder in an amount of about 1%, the molybdenum powder in a hydrogen atmosphere under 700 ~ 900 ℃ pretreatment 2 h, isostatic pressing, after high temperature sintering relative theoretical density of 92% to 96% molybdenum lanthanum alloy billets.
Lanthanum molybdenum alloy sheet rolling and heat treatment
Molybdenum lanthanum alloy billets at 1500 ℃ blooming, after warm-rolled, cold-rolled to 2.4 mm thick sheet. Said second processing rate of 25% ~ 35%, the total processing rate was 80%. The lanthanum molybdenum plates of rolled 1100,1250,1400,1550 and 1950 ℃ respectively hydrogen annealing furnace.
Preparation of lanthanum molybdenum alloy wire
With two molybdenum powder as raw material, mixed with a certain amount of lanthanum nitrate solution (weight ratio of lanthanum oxide content of 0.2% to 0.8%) for mixing powder and dried. The doped molybdenum oxide powder reduction, pressure type, sintering, and then by swaging, drawing made Φ0.18 mm molybdenum wire.
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