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Method for preparing tungsten-molybdenum alloy by doping beneficial elements

A tungsten-molybdenum alloy and element doping technology, which is applied in the field of tungsten-molybdenum alloy preparation by doping beneficial elements, can solve the problems of high brittleness and poor processing performance of tungsten-molybdenum alloys, and achieve improved shear abrasives, reduced directionality, and excellent Effect of High Temperature Creep Resistance

Active Publication Date: 2017-04-26
LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tungsten-molybdenum alloy powder is often used to prepare powder metallurgy products, but tungsten-molybdenum alloy has the disadvantages of high brittleness and poor processing performance, so it needs to be doped with alloy elements to strengthen it and improve its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The method for preparing tungsten-molybdenum alloy by doping beneficial elements comprises the following steps:

[0017] Step 1. According to the molar ratio of Pr:Re:Mo=1:1:0.5, successively weigh praseodymium nitrate, rhenium nitrate and ammonium molybdate and dissolve them in a citric acid solution with a molar concentration of 0.1mol / L to form a mixed solution , then add nitric acid to adjust the pH of the mixed solution to 1.0, heat the mixed solution in a water bath at 100°C to obtain a sol; heat the sol at 120°C for 0.8h and 600°C for 2h in turn to obtain a solid powder, and reduce the solid powder to After the treatment, it is calcined at 1450° C. for 20 minutes to obtain the doped molybdenum powder for subsequent use; the reduction treatment method of the solid powder itself is as follows: the solid powder is placed in a reduction furnace fed with hydrogen, and treated for 6 hours to obtain the molybdenum powder containing The mixed powder of molybdenum dioxide...

Embodiment 2

[0022] The method for preparing tungsten-molybdenum alloy by doping beneficial elements comprises the following steps:

[0023] Step 1. According to the molar ratio of Pr:Re:Mo=1:1:0.5, successively weigh praseodymium nitrate, rhenium nitrate and ammonium molybdate and dissolve them in a citric acid solution with a molar concentration of 0.1mol / L to form a mixed solution , then add nitric acid to adjust the pH of the mixed solution to 1.5, heat the mixed solution in a water bath at 90°C to obtain a sol; heat the sol at 100°C for 0.6h and 550°C for 3h in turn to obtain a solid powder, and reduce the solid powder to After the treatment, it is calcined at 1500°C for 12 minutes to obtain the doped molybdenum powder for future use; the reduction treatment method of the solid powder itself is as follows: the solid powder is placed in a reduction furnace fed with hydrogen, and treated for 5.5 hours to obtain Mixed powder containing molybdenum dioxide, in which the hydrogen flow rate ...

Embodiment 3

[0027] The method for preparing tungsten-molybdenum alloy by doping beneficial elements comprises the following steps:

[0028] Step 1. According to the molar ratio of Pr:Re:Mo=1:1:0.5, successively weigh praseodymium nitrate, rhenium nitrate and ammonium molybdate and dissolve them in a citric acid solution with a molar concentration of 0.1mol / L to form a mixed solution , then add nitric acid to adjust the pH of the mixed solution to 1.2, and heat the mixed solution in a water bath at 85°C to obtain a sol; heat the sol at 105°C for 0.5h and 450°C for 2h in turn to obtain a solid powder, which is reduced to After the treatment, it is calcined at 1550° C. for 10 minutes to obtain the doped molybdenum powder for subsequent use; the reduction treatment method of the solid powder itself is as follows: the solid powder is placed in a reduction furnace fed with hydrogen, and treated for 5 hours to obtain the molybdenum powder containing The mixed powder of molybdenum dioxide, in whi...

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PUM

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Abstract

A method for preparing tungsten-molybdenum alloy by doping beneficial elements comprises the following steps: preparing doped molybdenum powder; preparing doped tungsten powder; and preparing the tungsten-molybdenum alloy through 82-87.5% of doped molybdenum powder, 11-15% of doped tungsten, and 1.5-3.0% of vanadium oxide. The tungsten-molybdenum alloy prepared by the method is outstanding in high-temperature creep resistance and tensile strength, and high in low-temperature strength; after being plastically deformed, lanthanum oxide and praseodymium oxide are dispersed into fine second-phase particles under high temperature and are regularly arranged, so that the strengthening effect can be achieved.

Description

technical field [0001] The invention specifically relates to a method for preparing a tungsten-molybdenum alloy by doping with beneficial elements. Background technique [0002] Tungsten-molybdenum alloy has excellent resistance to the corrosion of liquid zinc, and is used to manufacture agitators, pipe and container linings and other components in the zinc smelting industry. Tungsten-molybdenum alloy has good high-temperature strength, similar performance to tungsten and smaller specific gravity than tungsten, so it can be used as high-temperature components in rockets and missiles, filaments and parts of electronic tubes, and other high-temperature materials under corresponding high-temperature conditions. Alloys of molybdenum and metals play an important role in cutting-edge fields such as weapon manufacturing and missile rockets. In addition, tungsten wire is used to make filaments, heating elements of high-temperature electric furnaces. Metal molybdenum is easily proc...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04C22C32/00
CPCC22C1/05C22C27/04C22C32/0031
Inventor 张灵杰
Owner LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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