Preparation method of wear-resistant molybdenum alloy

A technology of molybdenum alloy and ammonium molybdate, which is applied in the field of preparation of wear-resistant molybdenum alloy, can solve the problems such as particle fineness and mechanical strength to be improved, and achieve the effects of excellent corrosion resistance, good tensile strength and improved bonding force.

Inactive Publication Date: 2012-09-26
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle fineness and mechanical strength of the composite material need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The percentage by weight of each component of the raw materials used in the molybdenum alloy prepared in this embodiment is: 6.80% of aluminum nitrate, 37.30% of ammonium dimolybdate, and 55.90% of citric acid.

[0027] The preparation method of the molybdenum alloy of the present embodiment comprises the following steps:

[0028] 1) Weigh aluminum nitrate, ammonium dimolybdate and citric acid powder according to the above weight percentage, dissolve them in distilled water to make a solution, then mix the prepared three solutions evenly, and place them in a water bath at 85°C for 5 hours , to make it sol-gel, and then dry at 120°C for 6h to obtain a xerogel, and then bake the xerogel in a muffle furnace at 560°C for 6h to obtain Al 2 o 3 / MoO 3 mixed powder;

[0029] 2) Al 2 o 3 / MoO 3 The mixed powder was reduced under a hydrogen atmosphere at 520°C for 5 hours to reduce the molybdenum trioxide in the mixed powder to molybdenum dioxide, and at 950°C for 3 hours ...

Embodiment 2

[0035] The percentage by weight of each component of the raw materials used in the molybdenum alloy prepared in this embodiment is: 6.80% of aluminum nitrate, 37.30% of ammonium dimolybdate, and 55.90% of citric acid.

[0036] The preparation method of the molybdenum alloy of the present embodiment comprises the following steps:

[0037] 1) Weigh aluminum nitrate, ammonium dimolybdate and citric acid powder according to the above weight percentage, dissolve them in distilled water to make a solution, then mix the prepared three solutions evenly, and place them in a water bath at 85°C for 5 hours , to make it sol-gel, and then dry at 120°C for 6h to obtain a xerogel, and then bake the xerogel in a muffle furnace at 560°C for 6h to obtain Al 2 o 3 / MoO 3 mixed powder;

[0038] 2) Al 2 o 3 / MoO 3 The mixed powder was reduced under a hydrogen atmosphere at 520°C for 5 hours to reduce the molybdenum trioxide in the mixed powder to molybdenum dioxide, and at 950°C for 3 hours ...

Embodiment 3

[0044] The raw materials and components by weight of the molybdenum alloy prepared in this embodiment are: 14.01% of aluminum nitrate, 34.40% of ammonium dimolybdate, and 51.59% of citric acid.

[0045] The preparation method of the molybdenum alloy of the present embodiment comprises the following steps:

[0046] 1) Weigh aluminum nitrate, ammonium dimolybdate and citric acid powder according to the above weight percentage, dissolve them in distilled water respectively to make a solution, then mix the prepared three solutions evenly, and place them in a water bath at 85°C for 5 hours , to make it sol-gel, and then dry at 120°C for 6h to obtain a xerogel, and then bake the xerogel in a muffle furnace at 560°C for 6h to obtain Al 2 o 3 / MoO 3 mixed powder;

[0047] 2) Al 2 o 3 / MoO 3 The mixed powder was reduced under a hydrogen atmosphere at 520°C for 5 hours to reduce the molybdenum trioxide in the mixed powder to molybdenum dioxide, and at 950°C for 3 hours to reduce t...

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Abstract

The invention discloses a preparation method of a wear-resistant molybdenum alloy. The preparation method comprises the following steps: firstly, preparing a solutions by taking aluminium nitrate, citric acid and ammonium molybdate as raw materials, mixing the solutions to solate and gelate, and drying and roasting the gel to obtain Al2O3/MoO3 mixed powder; secondly, carrying out hydrogen reduction on the Al2O3/MoO3 mixed powder; thirdly, ball-milling the Al2O3/MoO3 mixed powder by use of a planetary ball mill; and finally carrying out hot pressed sintering to obtain the molybdenum alloy. The preparation method has the following beneficial effects: in the prepared molybdenum alloy, the alumina and molybdenum grains are very fine, the molybdenum grain size is 0.8-1.8 microns and the alumina grain size is 100-300 nanometers; the recrystallization temperatures of the prepared molybdenum alloy can be about 1550 DEG C; the high-temperature wear resistance and tensile strength of the molybdenum alloy are improved by 5-9% and 3-10% respectively compared with those of molybdenum base composites in CN101698919A; and the density and microhardness of the prepared molybdenum alloy are obviously improved, thereby achieving the aim of improving the high-temperature wear resistance of the wear-resistant molybdenum alloy.

Description

technical field [0001] The invention relates to a preparation method of a wear-resistant molybdenum alloy. Background technique [0002] Oxide dispersion strengthened alloy (ODS alloy) is an important high-temperature structural material for energy. At present, its research mainly focuses on nickel-based superalloys and cobalt-based alloys. Temperature is more difficult, so people seek new high-temperature materials. [0003] Alumina-reinforced molybdenum alloys are widely used in molybdenum plugs for metal pressure processing industry, high-temperature nozzles for aerospace, high-temperature molybdenum boats, etc. field. Although some progress has been made in alumina-reinforced molybdenum alloys in recent years, there are still some problems, mainly reflected in the size of authigenic alumina. In the alloy, the alumina particles grow significantly to the micron level, which affects the improvement of its high-temperature performance. As an important means to improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C27/04
Inventor 魏世忠徐流杰张国赏张丹丹倪锋马向东李继文周玉成
Owner HENAN UNIV OF SCI & TECH
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