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Rare earth ceramic reinforced molybdenum alloy and preparation method thereof

A molybdenum alloy and ceramic technology, applied in the field of preparation of the molybdenum alloy, can solve the problems of affecting the processing performance of molybdenum and its alloys, not containing high-hardness wear-resistant phases, poor strength, toughness and hardness, and improving room temperature brittleness, Enhance the effect of fine particle size and high temperature stability

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

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Problems solved by technology

However, metal molybdenum has poor strength, toughness, and hardness at high temperatures, and its recrystallization temperature is low, and it is easy to break after recrystallization.
At the same time, molybdenum and its alloys have high low temperature brittleness and high plastic-brittle transition temperature
These disadvantages affect the processing properties of molybdenum and its alloys, thus limiting its application range
[0003] At present, rare earth molybdenum alloys have a high recrystallization temperature and excellent mechanical properties, and are widely used in high-temperature conditions, but they do not contain high-hardness wear-resistant phases because of poor high-temperature wear resistance.
TZM alloy contains wear-resistant phases inside, and its high-temperature wear resistance is better than that of TZM alloys. Therefore, molybdenum alloys used in high-temperature wear-resistant fields are mainly TZM alloys. limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The rare earth ceramic reinforced molybdenum alloy of this embodiment is composed of the following components by weight percentage: aluminum oxide 1.2%, lanthanum oxide 0.5%, and the balance is molybdenum and inevitable impurities.

[0028] In the method for preparing molybdenum alloy in this embodiment, the ammonium molybdate used is ammonium dimolybdate, and the mass ratio is La(NO3) 3 : Al(NO 3 ) 3 ·9H 2 O: (NH 4 ) 2 Mo 2 O 7 The ratio is 1:7.78:154.66, the mass percentage of each component is: La(NO3) 3 0.55%, Al(NO 3 ) 3 ·9H 2 O4.76%, (NH 4 ) 2 Mo 2 O 7 94.59%, impurity content ≤0.1%.

[0029] The preparation method of the molybdenum alloy of this embodiment includes the following steps:

[0030] 1) Weigh lanthanum nitrate, aluminum nitrate and ammonium dimolybdate powder according to the mass of the molybdenum alloy to be finally prepared and the above mass ratio, and prepare them into solutions;

[0031] 2) Add citric acid to the ammonium dimolybdate solution by 3 times...

Embodiment 2

[0037] The rare earth ceramic reinforced molybdenum alloy of this embodiment is composed of the following components by weight percentage: alumina 6.4%, lanthanum oxide 2.5%, and the balance is molybdenum and unavoidable impurities.

[0038] The ammonium molybdate used in the molybdenum alloy prepared in this embodiment is ammonium dimolybdate, and the mass ratio is La(NO3) 3 : Al(NO 3 ) 3 ·9H 2 O: (NH 4 ) 2 Mo 2 O 7 The ratio is 1:9.38:32.8, and the mass percentage of each component is: La(NO3) 3 1.17%, Al(NO 3 ) 3 ·9H 2 O21.99%, (NH 4 ) 2 Mo 2 O 7 76.74%, impurity content ≤0.1%.

[0039] The preparation method of the molybdenum alloy of this embodiment includes the following steps:

[0040] 1) Weigh lanthanum nitrate, aluminum nitrate and ammonium dimolybdate powder according to the mass of the molybdenum alloy to be finally prepared and the above mass ratio, and prepare them into solutions;

[0041] 2) Add citric acid to the ammonium dimolybdate solution by 4 times the weight of a...

Embodiment 3

[0047] The rare earth ceramic reinforced molybdenum alloy of this embodiment is composed of the following components by weight percentage: 4.1% aluminum oxide, 1% lanthanum oxide, and the balance is molybdenum and unavoidable impurities.

[0048] The ammonium molybdate used in the molybdenum alloy prepared in this embodiment is ammonium tetramolybdate, and the mass ratio is La(NO3) 3 : Al(NO 3 ) 3 ·9H 2 O: (NH 4 ) 2 Mo 4 O 13 ·2H 2 O is 1:13.61:72.97 ratio, the mass percentage of each component is: La(NO3) 3 1.14%, Al(NO 3 ) 3 ·9H 2 O15.54%, (NH 4 ) 2 Mo 4 O 13 ·2H 2 O83.22%, impurity content ≤0.1%.

[0049] The preparation method of the molybdenum alloy of this embodiment includes the following steps:

[0050] 1) Weigh lanthanum nitrate, aluminum nitrate and ammonium dimolybdate powder according to the mass of the molybdenum alloy to be finally prepared and the above mass ratio, and prepare them into solutions;

[0051] 2) Add citric acid to the ammonium dimolybdate solution according...

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Abstract

The invention discloses a rare earth ceramic reinforced molybdenum alloy and a preparation method thereof. The molybdenum alloy comprises the following components by weight percent: 1.2-6.4% of alumina, 0.5-2.5% of lanthana and the balance of molybdenum and inevitable impurities. Concerning the molybdenum alloy, the recrystallization temperature reaches 1350 DEG C, the high-temperature creep resistance is 1.5-2 times that of the rare earth molybdenum alloy, the high-temperature hardness is 1.5-2 times that of the TZM molybdenum alloy and the wear resistance is 2-4 times that of the TZM molybdenum alloy. The preparation process is simple and is easily controlled; and the molybdenum alloy has fine and more uniformly distributed reinforced grains and the composite can be prepared under the condition of the process for producing the molybdenum alloy through conventional powder metallurgy; and therefore the molybdenum alloy has very extensive application prospect.

Description

Technical field [0001] The invention relates to a rare earth ceramic reinforced molybdenum alloy, and also to a preparation method of the molybdenum alloy. Background technique [0002] Metal molybdenum and its alloys have the characteristics of high melting point, high high temperature strength, low high temperature creep rate, small expansion coefficient, excellent thermal conductivity and thermal shock resistance, strong wear resistance and corrosion resistance, etc., and are widely used as high-performance materials Metallurgy, machinery, petroleum, chemical industry, national defense, aviation, aerospace, electronics, nuclear industry and many other fields. However, metallic molybdenum has poor strength, toughness, and hardness at high temperatures, and has a low recrystallization temperature, and is easy to brittle and fracture after recrystallization. At the same time, molybdenum and its alloys are brittle at low temperatures and have a high plastic-brittle transition tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C27/04C22C1/04
Inventor 魏世忠徐流杰李继文刘强李保元张国赏马向东周玉成
Owner HENAN UNIV OF SCI & TECH
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