Because the rhenium has very excellent performance in the table below, thus adding rhenium form rhenium tungsten alloy, tungsten and molybdenum rhenium is added to the formation of molybdenum rhenium alloy, the alloy electric properties and high temperature ductility, processability can be greatly improved and strengthened, and can be widely used in high temperature heating body, temperature measuring thermocouple, tube cathode and other high temperature parts, etc. According to customer requirements to produce a variety of specifications of tungsten rhenium/molybdenum rhenium alloy products, the form can be wire, rod, sheet, plate or other shaped parts. Adding 41%-47.5% rhenium into molybdenum to form molybdenum-rhenium alloy (nominal composition is 50%Mo+50%Re), which has good high temperature ductility and is used in electronics industry, nuclear industry and aerospace industry.
A method for forming rhenium components using spherical rhenium powder, the steps of which include:
(a) spheroidization of rhenium powder;
100 mesh ~ 400 high purity rhenium powder was selected. Firstly, high purity rhenium powder was reduced to 750℃ ~ 1000℃ in hydrogen with purity greater than 99.99% for 0.5 ~ 3 hours. Then heat treatment at 1000℃ ~ 1200℃ for 0.5 ~ 3 hours at the vacuum degree less than 5× 10-3pa; Finally, spherical rhenium powder was obtained by spheroidal treatment in 40kW ~ 200kW induction plasma equipment.
(b) powder loading and degassing packaging;
The spherical rhenium powder obtained in step (a) is loaded into the package, filled with vibration, and then the cover is welded and fixed. The jacket was degassed with the outlet pipe on the jacket cover. At 750℃ ~ 900℃, the jacket was degassed for 8 hours ~ 48 hours, and the vacuum degree was less than 5× 10-3pa.
The material of the package is steel, titanium, niobium or tantalum; The package is used for sealing spherical rhenium powder on one hand and forming the rhenium member on the other hand.
(c) low temperature hot isostatic compaction;
The package obtained in step (b) is treated with hot isostatic pressure; The temperature of the thermal isostatic pressure treatment is 1250℃ ~ 1400℃, the time is 1 hour ~ 5 hours, and the pressure is ≥110MPa.
(d) sleeve removal;
After the hot isostatic pressure treatment in step (c), the shell is removed by mechanical processing or chemical milling to obtain rhenium blank.
(e) ultra-hot treatment;
The rhenium blank obtained in step (d) was heat-treated for 0.5 h ~ 6 h at the temperature of 2000℃ ~ 2600℃ in a vacuum or hydrogen atmosphere.
