Method for doping rare earth lanthanum in nano molybdenum powder

A nano-rare earth and lanthanum doping technology, which is applied in the field of nano-rare earth lanthanum doped molybdenum powder, can solve problems such as chemical reaction deposits and achieve the effect of eliminating chemical reaction deposits

Inactive Publication Date: 2014-04-16
刘成涛
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhou Meiling et al prepared nano-scale doped molybdenum powder by liquid-liquid method and sol-gel technology. etc. did not report in detail
Simultaneously above-mentioned method preparation process occurs chemical reaction precipitate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for doping molybdenum powder with nano-rare earth lanthanum, carried out according to the following steps:

[0015] (1) Mix ammonium paramolybdate, rare earth lanthanum nitrate and complexing agent citric acid in solution, and use HNO 3 and NH 3 Adjust the pH value of the solution to 1 with water, so that citrate ions, molybdate ions and rare earth ions complex to form stable compounds. The solution turns into a transparent light yellow sol in a water bath at 90 ℃, and dry gel is obtained after drying at 120 ℃. ;

[0016] (2) The xerogel was sintered at 560 °C for 6 h, and then two-step reduction was performed in a four-tube sintering reduction furnace using hydrogen as the reducing agent to obtain doped MoO 3 powder and Mo powder, the reduction temperature of the two-step reduction is 540 ℃ and 980 ℃, respectively, and the nano-doped rare earth molybdenum powder with round particles and uniform distribution is prepared. The size of the doped phase is belo...

Embodiment 2

[0019] A method for doping molybdenum powder with nano-rare earth lanthanum, carried out according to the following steps:

[0020] (1) Mix ammonium paramolybdate, rare earth lanthanum nitrate and complexing agent citric acid in solution, and use HNO 3 and NH 3 Water adjusts the pH value of the solution to 1, so that citrate ions, molybdate ions and rare earth ions complex to form stable compounds. The solution turns into a transparent light yellow sol in a water bath at 70 ℃, and dry gel is obtained after drying at 100 ℃. ;

[0021] (2) The xerogel was sintered at 560 °C for 6 h, and then two-step reduction was performed in a four-tube sintering reduction furnace using hydrogen as the reducing agent to obtain doped MoO 3 powder and Mo powder, the reduction temperature of the two-step reduction is 540 ℃ and 980 ℃, respectively, and the nano-doped rare earth molybdenum powder with round particles and uniform distribution is prepared. The size of the doped phase is below 10...

Embodiment 3

[0024] A method for doping molybdenum powder with nano-rare earth lanthanum, carried out according to the following steps:

[0025] (1) Mix ammonium paramolybdate, rare earth lanthanum nitrate and complexing agent citric acid in solution, and use HNO 3 and NH 3 Water adjusts the pH value of the solution to 1, so that citrate ions, molybdate ions and rare earth ions complex to form stable compounds. The solution turns into a transparent light yellow sol in a water bath at 80 ℃, and dry gel is obtained after drying at 110 ℃. ;

[0026] (2) The xerogel was sintered at 560 °C for 6 h, and then two-step reduction was performed in a four-tube sintering reduction furnace using hydrogen as the reducing agent to obtain doped MoO 3 powder and Mo powder, the reduction temperature of the two-step reduction is 540 ℃ and 980 ℃, respectively, and the nano-doped rare earth molybdenum powder with round particles and uniform distribution is prepared. The size of the doped phase is below 10...

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Abstract

The invention provides a method for doping rare earth lanthanum in nano molybdenum powder, and belongs to the field of rare earth materials. The method includes the following steps that (1) ammonium paramolybdate, rare earth lanthanum nitrate and complexing agent citric acid are doped in a solution mode, the pH value of the solution is adjusted through HNO3 and NH3 water to be 1-3, complexing is performed on citrate ions, molybdate ions and rare earth ions to obtain a stable compound, water bath is performed on the solution at the temperature of 70-90 DEG C to obtain transparent faint yellow sol, and the transparent faint yellow sol is dried at the temperature of 100-120 DEG C to obtain xerogel; (2) the xerogel is sintered for 6 hours at the temperature of 560 DEG C, then in a four-tube sintering reduction furnace, two-step reduction is performed with hydrogen as a reducing agent to obtain doped MoO3 powder and doped Mo powder respectively, the reduction temperatures of the two-step reduction are 540 DEG C and 980 DEG C respectively, the doped nano rare earth molybdenum powder which is round and normal in particle and even in distribution is prepared, the size of doping phase is below 100nm, and the size of doped molybdenum powder particles is 300-500nm. According to the method, the nano molybdenum powder doped with the earth lanthanum evenly is prepared, and meanwhile chemical reaction sediments in the liquid-liquid doping process are eliminated.

Description

technical field [0001] The invention belongs to the field of rare earth materials, and in particular relates to a method for doping molybdenum powder with nanometer rare earth lanthanum. [0002] Background technique [0003] Molybdenum and molybdenum alloys have the advantages of high melting point, high temperature strength, good thermal and electrical conductivity, low thermal expansion coefficient, and corrosion resistance to molten salts and liquid light metals. They are widely used in the electronics industry, chemical industry, metallurgical industry and aerospace industry. However, defects such as low recrystallization temperature, fracture brittleness during processing deformation, and poor high-temperature oxidation resistance limit the wide application of pure molybdenum as a structural material. Doping rare earth elements is an effective way to increase the recrystallization temperature of pure molybdenum. Molybdenum materials doped with rare earth not only ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 刘成涛
Owner 刘成涛
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