In-situ synthesized Al2O3 reinforced molybdenum based composite material and preparation method thereof

An in-situ self-generated and composite material technology, applied in the field of molybdenum-based composite materials and its preparation, achieves the effects of simple preparation and production process, easy control, and broad application prospects

Inactive Publication Date: 2009-03-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, molybdenum-based materials with excellent high-temperature wear resistance ha

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example prepares a high-temperature wear-resistant molybdenum-based composite material. The molybdenum oxide used is molybdenum dioxide powder, and the reaction is as follows: 4Al+3MoO 2 =Mo+2Al 2 o 3 conduct. According to mass ratio Al:MoO 2 For 1:111 ratio:

[0032] Aluminum powder 0.89%

[0033] Molybdenum Dioxide 99.10%

[0034] Impurity content <0.1%

[0035] Put the above powder raw materials into a ball mill and carry out wet mixing for 3 hours under the protection of alcohol at a speed of 240r / min; dry in a vacuum oven at 80°C for 2 hours; in a gas protection furnace at 530°C for 3 hours under nitrogen protection; Reduction in a gas shielded furnace at 930°C for 7 hours under the protection of hydrogen; cold isostatic pressing at a pressure of 200Mpa, holding the pressure for 8 minutes to press the blank; sintering in a vacuum sintering furnace at 1800°C for 16 hours. A volume fraction of 5% Al was obtained 2 o 3 Particle-reinforced molybdenum-base...

Embodiment 2

[0037] This example prepares a high-temperature wear-resistant molybdenum-based composite material. The molybdenum oxide used is molybdenum dioxide powder, and the reaction is as follows: 4Al+3MoO 2 =Mo+2Al 2 o 3 conduct. According to mass ratio Al:MoO 2 For 1:61 ratio:

[0038]Aluminum powder 1.60%

[0039] Molybdenum Dioxide 98.30%

[0040] Impurity content <0.1%

[0041] Add the above powder raw materials into a ball mill for 3 hours of wet mixing under the protection of alcohol at a speed of 240r / min; dry in a vacuum oven at 80°C for 2 hours; in a gas protection furnace at 550°C for 3 hours under nitrogen protection; Reduction in a gas shielded furnace at 940°C for 7 hours under the protection of hydrogen; cold isostatic pressing at a pressure of 180Mpa, holding the pressure for 10 minutes to form a billet; sintering in a vacuum sintering furnace at 1800°C for 16 hours. A volume fraction of 10% Al is obtained 2 o 3 Particle-reinforced molybdenum-based composites. ...

Embodiment 3

[0043] This example prepares a high-temperature molybdenum-based composite material, and the molybdenum oxide used is molybdenum trioxide powder, and the reaction is as follows: 2Al+MoO 3 =Mo+Al 2 o 3 conduct. According to mass ratio Al:MoO 3 The ratio is 1:137.8:

[0044] Aluminum powder 0.72%

[0045] Molybdenum trioxide 99.27%

[0046] Impurity content <0.1%

[0047] Add the above powder raw materials into a ball mill for 3 hours of wet mixing under the protection of alcohol at a speed of 240r / min; dry in a vacuum oven at 80°C for 2 hours; in a gas protection furnace at 540°C for 3 hours under the protection of nitrogen; Reduction at 520°C for 4h and 930°C for 7h in a gas protection furnace under the protection of hydrogen; cold isostatic pressing at a pressure of 220Mpa, holding the pressure for 8 minutes to press the blank; sintering in a vacuum sintering furnace at 1800°C for 16h. A volume fraction of 5% Al was obtained 2 o 3 Particle dispersion reinforced molyb...

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Abstract

The invention discloses an in situ authigenic Al2O3 granule reinforced molybdenum base composite material and a preparation method thereof. The in situ authigenic Al2O3 granule reinforced molybdenum base composite material is prepared with aluminum powder and molybdenum oxide powder, wherein, the mass fraction of the aluminum powder is 0.5 percent to 2.5 percent. Composite material organization prepared is molybdenum base and Al2O3 with the volume fraction of 5 percent to 15 percent, and Al2O3 is distributed evenly in the molybdenum base. The preparation method is as follows: (1) mixing powder is obtained by evenly mixing the aluminum powder and molybdenum oxide; (2) the mixing powder, after heat preservation for 3h in a vacuum sintering furnace at the temperature of 530 DEG C to 550 DEG C under the nitrogen protection, is reduced; (3) the mixing powder is reduced by use of hydrogen at the temperature of 500 DEG C to 550 DEG C for 4h, and at the temperature of 920 DEG C to 950 DEG C for 7h; (4) an isostatic cool pressing is carried out under the pressure of 180MPa to 220MPa and a blank sheet is made by maintaining pressure for 8 minutes to 10 minutes; and (5) the sintering is carried out in the vacuum sintering furnace at the temperature of 1,600 DEG C to 2,000 DEG C for 16h to 18h. The Al2O3 granules are adopted to enhance molybdenum base composite materials, recrystallization temperature reaches more than 1,500 DEG C, the high-temperature strength and rigidity thereof are improved by more than 50 percent compared with TZM molybdenum alloy, and the high-temperature wear resistance thereof is 2 times to 4 times higher than that of the TZM molybdenum alloy. The in situ authigenic Al2O3 granule reinforced molybdenum base composite material has broad application prospect in the high-temperature wear resistance field.

Description

technical field [0001] The invention belongs to the technical field of molybdenum-based composite materials and their preparation, and mainly relates to an in-situ self-generated Al 2 o 3 Particle-reinforced molybdenum-based composites and methods for their preparation. Background technique [0002] Molybdenum is a rare refractory metal with important strategic significance, with a melting point of 2620°C and a density of 10.2g / cm 3 , which is located in the VIB of the periodic table of elements, has an A2 type body-centered cubic structure. Due to the strong bonding force between atoms, it has high strength at room temperature and high temperature. The main consumption areas of molybdenum are: iron and steel industry accounts for about 75%, followed by catalyst industry accounts for about 15%, molybdenum metal and super alloy industries account for 6% and 4% respectively. From a structural point of view, the consumption of molybdenum in the form of deep-processing produc...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04
Inventor 魏世忠徐流杰张国赏李继文代宝珠周玉成张万红马向东
Owner HENAN UNIV OF SCI & TECH
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