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Preparation method of particular-reinforced molybdenum-based composite material

A composite material and particle-reinforced technology, which is applied in the field of preparation of particle-reinforced molybdenum-based composite materials, can solve problems such as small amount of addition, uneven mixing, and coarse grains of ammonium molybdate, so as to increase the number of nucleation and controllable Good performance and uniform doping effect

Active Publication Date: 2015-02-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of oxides in general molybdenum-based composite materials is very small, and the ammonium molybdate first reaches saturation during evaporative crystallization, and gradually precipitates and grows, until finally, the soluble salt of the second phase reaches saturation and precipitates. The result is segregation, the mixing is not uniform enough, and the grains of ammonium molybdate are relatively coarse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Al in this example 2 o 3 Particle-reinforced molybdenum-based composites (Al 2 o 3 Content 1.0%) preparation method, comprises the following steps:

[0026] (1) According to the ingredients of 100g composite material, where Al 2 o 3 The mass ratio with Mo is 1:99 to carry out batching calculation, take by weighing 171.19g ammonium tetramolybdate, 7.35g aluminum nitrate respectively;

[0027] (2) Dissolve ammonium tetramolybdate in distilled water, add ammonia water and stir until the pH value is 9 for subsequent use;

[0028] (3) Dissolve aluminum nitrate in distilled water, add dropwise to the solution of step (1), stir while dripping, the pH value after the dropwise addition is not less than 8 (add ammonia water to adjust), then heat and evaporate to crystallize while stirring, crystallization Complete the ammonium molybdate / aluminum hydroxide composite powder;

[0029] (4) Calcinate the composite powder at 500°C for 5 hours to obtain molybdenum trioxide / Al 2 ...

Embodiment 2

[0034] ZrO in this embodiment 2 Particle-reinforced molybdenum-based composites (ZrO 2 Content 2.0%) preparation method, comprises the following steps:

[0035] (1) According to the ZrO in the composite material 2 The mass ratio with Mo is 1:49 for batching calculation, and 180.34g ammonium heptamolybdate and 5.51g zirconium nitrate are weighed respectively;

[0036] (2) dissolving ammonium heptamolybdate in distilled water, adding ammonia water and stirring until the pH value is 10 for subsequent use;

[0037] (3) Dissolve zirconium nitrate in distilled water, add dropwise to the solution of step (1), stir while dripping, the pH value after the dropwise addition is not less than 8 (adjusted by adding ammonia water), then heat, evaporate and crystallize while stirring, and crystallize Complete the ammonium molybdate / zirconium hydroxide composite powder;

[0038] (4) Calcinate the composite powder at 520°C for 4 hours to obtain molybdenum trioxide / ZrO 2 Composite powder, a...

Embodiment 3

[0043] In this example La 2 o 2 Particle-reinforced molybdenum-based composites (La 2 o 2 Content 1.5%) preparation method, comprises the following steps:

[0044] (1) According to La in the composite material 2 o 2 The mass ratio with Mo is 3:197 to carry out batching calculation, take by weighing 174.51g ammonium dimolybdate, 2.66g lanthanum nitrate respectively;

[0045] (2) dissolving ammonium dimolybdate in distilled water, adding ammonia water and stirring until the pH value is 10 for subsequent use;

[0046] (3) Dissolve lanthanum nitrate in distilled water, add dropwise in the solution of step (1), stir while dripping, the pH value of dropwise addition is not less than 8 (can be adjusted by adding ammonia water), then heat and evaporate crystallization while stirring, Crystallization is completed to obtain ammonium molybdate / lanthanum hydroxide composite powder;

[0047] (4) Calcinate the composite powder at 520°C for 5 hours to obtain molybdenum trioxide / La 2 ...

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Abstract

The invention discloses a preparation method of a particular-reinforced molybdenum-based composite material and belongs to the technical field of preparation of composite materials. The method includes following steps: (1) adding enough ammonia water to an ammonium molybdate solution for enabling the ammonia water to be alkaline; (2) dissolving a soluble aluminum salt, a soluble zircon salt or a soluble lanthanum salt in water to obtain a solution and slowly adding the solution to the ammonium molybdate solution with stirring to generate a flocculent precipitation; (3) performing a heating and evaporatively-drying process to obtain an ammonium molybdate / metal hydroxide composite powder; (4) performing low-temperature calcination to obtain a molybdenum trioxide / metal hydroxide composite powder; (5) reducing the molybdenum trioxide into molybdenum powder; and (6) performing a pressing process and a sintering process to obtain the particulate reinforced molybdenum-based composite material. In the invention, a second phase is firstly precipitated out for forming a nano-scale flocculent precipitation, and then an evaporative crystallization process is carried out so that the ammonium molybdate forms a nucleus with the nano-scale second phase being a nucleation core, wherein the second phase is dispersed and distributed on a molybdenum substrate and is completely metallurgically bonded with the molybdenum substrate. Growth of crystal grain during sintering can be effectively stopped and a crystal grain refining effect is achieved.

Description

technical field [0001] The invention specifically relates to a method for preparing a particle-reinforced molybdenum-based composite material, which belongs to the technical field of composite material preparation. Background technique [0002] Molybdenum and molybdenum-based composite materials have good high-temperature strength and high-temperature hardness, good thermal conductivity and electrical conductivity, low thermal expansion coefficient, excellent wear resistance and corrosion resistance, and are widely used in aerospace, energy and power, microelectronics , biomedicine, mechanical processing, medical equipment, lighting, glass fiber, national defense construction and other fields. my country is the world's second largest molybdenum resource country (after the United States) and the largest molybdenum producer country. [0003] In special applications such as high temperature resistance and high temperature wear resistance, molybdenum-based composite materials h...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C27/04C22C32/00B22F9/22
Inventor 魏世忠周玉成徐流杰张国赏李继文刘伟潘昆明
Owner HENAN UNIV OF SCI & TECH
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