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Preparation method of Al2O3/Mo composite material

A composite material and composite powder technology, which is applied in the field of preparation of Al2O3/Mo composite materials, can solve the problems of limited batch production, poor doping uniformity, and affecting the quality of composite materials, and achieve excellent comprehensive performance and process controllability Strong, broad application prospects and the effect of promotional value

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

[0005] Currently, Al 2 o 3 The preparation methods of / Mo composite materials include solid-solid doping method, solid-liquid doping method and liquid-liquid doping method. The first two doping methods have poor doping uniformity and difficult to control particle size.
The existing liquid-liquid doping method is mainly the sol-gel method, which is uniformly doped and has fine particles, but this method is prone to precipitation during the gelation process, which affects the quality of the composite material, and the mass production of this method is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, Al 2 O 3 / Mo composite material (Al 2 O 3 The content of 20%) preparation method, including the following steps:

[0029] (1) According to 100g of composite material, Al 2 O 3 The mass ratio to Mo is 2:8 to calculate the ingredients, weigh 138.40g of ammonium tetramolybdate, 147.11g of aluminum nitrate, and a slight excess of 38.00g of urea;

[0030] (2) Add aluminum nitrate and urea into a 400mL reactor, add distilled water, fill it to 80%, stir well to dissolve it, then heat to 170℃ for 15 hours, take it out after cooling, discard the clear liquid, and put the sediment Put it into a beaker, add 300 mL of distilled water and stir to obtain a suspension containing AlOOH nanoparticles;

[0031] (3) Add ammonium tetramolybdate to a 400mL reactor, add distilled water, drop in nitric acid, adjust the pH to 1.0, fill the degree to 90%, then heat to 170℃ for 15 hours, take it out after cooling, and pour out the clear liquid , Add the precipitate to 700mL distill...

Embodiment 2

[0038] In this embodiment, Al 2 O 3 / Mo composite material (Al 2 O 3 The preparation method with content of 0.75%) includes the following steps:

[0039] (1) According to 100g of composite material, Al 2 O 3 The mass ratio to Mo is 1:99 to calculate the ingredients, and weigh 182.2g of ammonium heptamolybdate, 3.35g of aluminum sulfate and a slight excess of 1.76g of urea;

[0040] (2) Add aluminum sulfate and urea into a 100mL reaction kettle, add distilled water, fill it to 80%, stir well to dissolve it, then heat to 160℃ for 40 hours, take it out after cooling, discard the clear liquid, and remove the sediment Put it in a beaker, add 100 mL of distilled water and stir to obtain a suspension containing AlOOH nanoparticles;

[0041] (3) Add ammonium heptamolybdate into a 400mL reactor, add distilled water, drop in nitric acid, adjust the pH to 1.5, fill the degree to 90%, then heat to 160℃ for 40 hours, take it out after cooling, and pour out the clear liquid , Add the precipitate ...

Embodiment 3

[0049] In this embodiment, Al 2 O 3 / Mo composite material (Al 2 O 3 The preparation method with a content of 80%) includes the following steps:

[0050] (1) According to 100g of composite material, Al 2 O 3 The mass ratio to Mo is 8:2 to calculate the ingredients, and weigh 35.44g ammonium dimolybdate, 588.44g aluminum nitrate and a slight excess of 145g ammonium bicarbonate;

[0051] (2) Add aluminum nitrate and ammonium bicarbonate into a 2000mL reaction kettle, add distilled water, fill it to 80%, stir well to dissolve it, then heat to 200℃ for 10 hours, take it out after cooling, discard the clear liquid, Put the precipitate into a beaker, add 1500 mL of distilled water and stir to obtain a suspension containing AlOOH nanoparticles;

[0052] (3) Add ammonium dimolybdate to a 100mL reactor, add distilled water, drop nitric acid, adjust the pH to 1.5, fill the degree to 90%, and then heat to 200 ℃ for 10 hours, take it out after cooling, and add the precipitate Stir evenly in 500...

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Abstract

The invention discloses a preparation method of an Al2O3 / Mo composite material and belongs to the technical field of composite material preparation. The method includes following steps: (1) synthesizing AlOOH nano-particles from an aluminum salt and a precipitating agent in a hydrothermal manner and meanwhile synthesizing MoO3 nano-particles from ammonium molybdate in a hydrothermal manner; (2) mixing the two turbid liquid with fully stirring and performing filtration, a washing process and a drying process to obtain an AlOOH / MoO3 composite powder; (3) performing calcination at 500-580 DEG C for converting MoO3 from a metastable hexagonal structure into a stable orthorhombic structure and enabling AlOOH to be converted into [gamma]-Al2O3 in a dehydration manner; (4) feeding hydrogen for performing reduction for two times to enable the MoO3 to be reduced into Mo powder; and (5) performing a pressing process and a sintering process to obtain the Al2O3 / Mo composite material. An Al2O3 hard ceramic phase is high in hardness, is good in abrasive resistance and is strong in chemical stability and has a quite strong reinforcing effect on molybdenum. Al2O3 ceramic particle is dispersed and distributed on a molybdenum substrate and is doped with the molybdenum substrate uniformly. The Al2O3 ceramic particle and the molybdenum substrate are completely metallurgically combined so that grain growth during sintering can be effectively stopped and an effect of refining grain is achieved.

Description

Technical field [0001] The invention specifically relates to an Al 2 O 3 The preparation method of / Mo composite material belongs to the technical field of composite material preparation. Background technique [0002] Molybdenum and molybdenum alloys have good high-temperature strength and high-temperature hardness, good thermal and electrical conductivity, low thermal expansion coefficient, excellent wear resistance and corrosion resistance, and are widely used in aerospace, energy and power, microelectronics, and biological Medicine, machinery processing, medical equipment, lighting, fiberglass, 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. [0003] In special applications such as high temperature resistance and high temperature wear resistance, molybdenum alloys have irreplaceable advantages, such as molybdenum plugs, high-temperature nozzle mate...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04C22C29/12B22F9/22
Inventor 周玉成魏世忠徐流杰潘昆明刘伟李继文张国赏胡亚杰崔超鹏
Owner HENAN UNIV OF SCI & TECH
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