A high performance molybdenum-rhenium alloy bar is composed of rhenium 5 ~ 50% and molybdenum residue according to mass percentage. And the preparation method of the high performance molybdenum-rhenium alloy bar, including the following steps: Step 1, according to the molybdenum and rhenium alloy bar group distribution score named molybdenum source and rhenium source, pretreatment, get molybdenum rhenium alloy powder; Step 2, the molybdenum rhenium alloy powder is loaded into the designed mold cavity for pressing and forming treatment, to get the blank; Step 3, the billet is sintered at high temperature in reductive atmosphere, inert gas or vacuum conditions to get sintered billets; Step 4, the sintered billet is deformed by rolling to get the rolling bar blank. Step 5: Annealing the rolling rod billet to obtain the high performance molybdenum rhenium alloy rod. The molybdenum rhenium alloy prepared by the preparation method has fine grain, uniform grain, high density and high strength.
Rhenium added to pure molybdenum can improve the low temperature brittleness of molybdenum alloy, increase the recrystallization temperature, increase the plasticity at room temperature and high temperature strength, reduce the brittle transition temperature, and obviously improve the machining performance of the material. It is widely used in the fields of aerospace, electronics, semiconductor and high temperature furnace heating components.
Step 1: preparation of molybdenum-rhenium alloy powder: according to the molybdenum rhenium alloy rod group distribution score is called molybdenum source and rhenium source, pretreatment, molybdenum rhenium alloy powder;
Step 2: pressing molding treatment: in accordance with the design weight of step one to get the molybdenum rhenium alloy powder into the design of the mold cavity for pressing molding treatment, get the blank;
Step 3: high temperature sintering treatment: the billet obtained in step two is sintered at high temperature in reducing atmosphere, inert gas or vacuum conditions to get sintered billets;
Step 4, rolling deformation treatment: the sintering billet obtained in Step 3 is rolling deformation treatment, and the rolling rod blank is obtained;
Step 5: annealing treatment: Annealing treatment is carried out on the rolling rod blank obtained in step 4 to obtain the high-performance molybdenum rhenium alloy rod.
The technical principle of the preparation method of the invention is as follows: on the one hand, molybdenum powder is mixed with ammonium rhenate powder, and appropriate reduction process is adopted to prepare molybdenum rhenium pre-alloy powder with special ratio; On the other hand, the continuous rolling process achieves the densification of alloy with single fire and large deformation, which has the advantages of fine grain, high density and high pass rate compared with the free forging process.
