Sintered molybdenum lanthanum alloy billet with high tensile strength
Molybdenum metal material is a kind of aeronautics and astronautics, electronic appliances, machinery processing, military, metallurgy and other fields have a very widely used, such as high melting point, high strength, high creep and corrosion resistance, low thermal expansion coefficient and good thermal conductivity and electrical conductivity and other excellent characteristics of the commonly used high temperature alloy, and with the further development of the technology, The requirements for the properties of molybdenum metal materials are also improved.
Generally, the sintering temperature of molybdenum metal materials is above 1900℃, which has high requirements on production equipment and energy consumption, and its yield strength, tensile strength and other properties are not very ideal.
How to produce sintered molybdenum lanthanum alloy billet with high tensile strength?
The preparation of mixture is very important when the sintered blank of molybdenum lanthanum alloy is prepared. Molybdenum powder and LaB6 were weighed in a certain proportion, and then mixed to get the evenly mixed mixture.
In the process of sintering, LaB6 due to La and B of oxygen with a strong combining ability, can with the oxygen and Mo powder, purify grain boundary, so the purification ability of the oxygen atoms of grain boundary in far better than the ordinary lanthanum oxide, effectively improve the interface bonding strength between Mo matrix grain, contribute to the rapid diffusion in the process of sintering, improve the performance of density and the corresponding mechanics.
Billet preparation: the powder after the mixture is pressed according to the demand to get the billet;
Preparation of pure molybdenum sintered products: the billet is put into the sintering furnace; The sintered blank of lanthanum molybdenum alloy was obtained in hydrogen atmosphere according to the set technological parameters.
Molybdenum powder is prepared by two-stage reduction of industrial ammonium molybdate. LaB6 accounted for 1-1.5% of the total mixture; The horizontal mixer is used for mixing.
