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High-temperature oxidation and wear resistant molybdenum alloy and preparation method thereof

An oxidation-resistant and molybdenum alloy technology is applied in the field of high-temperature oxidation-resistant and wear-resistant molybdenum alloys, which can solve problems such as unsatisfactory high-temperature wear resistance, and achieve the effects of easy control, simple preparation process and broad application prospects.

Active 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, traditional molybdenum alloys lack sufficient wear-resistant phases to resist wear and are easily oxidized in air at high temperatures, so their high-temperature wear resistance is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The high-temperature oxidation-resistant and wear-resistant molybdenum alloy of this embodiment is composed of the following components in parts by weight: Cr 8%, Ti 1.0%, Nb 3.0%, C 0.25%, the balance is molybdenum, and the impurity content is ≤0.1%.

[0016] The high-temperature oxidation-resistant and wear-resistant molybdenum alloy of this embodiment is prepared by the following steps:

[0017] 1) According to the mass fraction of the above components, weigh the chromium powder, TiH 2 powder, niobium powder, carbon powder and molybdenum powder;

[0018] 2) Mix the above powder in a mixer for 30 hours;

[0019] 3) Cold isostatic pressing of the mixed powder under a pressure of 220 MPa to form a billet;

[0020] 4) Sintering the formed billet in a hydrogen atmosphere at 1780° C. for 10 hours to obtain a molybdenum alloy.

[0021] The recrystallization temperature of the molybdenum alloy of the present invention is 1200°C, the high temperature creep resistance is 1....

Embodiment 2

[0023] The high-temperature oxidation-resistant and wear-resistant molybdenum alloy of this embodiment is composed of the following components in parts by weight: Cr 15%, Ti 4.0%, Nb 2.0%, C 1.26%, the balance is molybdenum, and the impurity content is ≤0.1%.

[0024] The high-temperature oxidation-resistant and wear-resistant molybdenum alloy of this embodiment is prepared by the following steps:

[0025] 1) According to the mass fraction of the above components, weigh the chromium powder, TiH 2 powder, niobium powder, carbon powder and molybdenum powder;

[0026] 2) Mix the above powder in a mixer for 20 hours;

[0027] 3) Cold isostatic pressing of the mixed powder under a pressure of 250 MPa to form a billet;

[0028] 4) Sintering the formed billet in a hydrogen atmosphere at 1850° C. for 15 hours to obtain a molybdenum alloy.

[0029] The recrystallization temperature of the molybdenum alloy prepared by the technology of the present invention is 1270°C, the high-temper...

Embodiment 3

[0031] The high-temperature oxidation-resistant and wear-resistant molybdenum alloy of this embodiment is composed of the following components in parts by weight: Cr 12%, Ti 4.5%, Nb 5.0%, C 1.90%, the balance is molybdenum, and the impurity content is ≤0.1%.

[0032] The high-temperature oxidation-resistant and wear-resistant molybdenum alloy of this embodiment is prepared by the following steps:

[0033] 1) according to above-mentioned component mass fraction, take by weighing chromium powder, titanium powder, niobium powder, carbon powder and molybdenum powder;

[0034] 2) Mix the above powder in a mixer for 26 hours;

[0035] 3) Cold isostatic pressing of the mixed powder under a pressure of 235 MPa to form a billet;

[0036] 4) Sintering the formed billet in a hydrogen atmosphere at 1810° C. for 20 hours to obtain a molybdenum alloy.

[0037] The recrystallization temperature of the molybdenum alloy prepared by the technology of the present invention is 1300°C, the high...

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Abstract

The invention discloses a high-temperature oxidation and wear resistant molybdenum alloy and a preparation method thereof. The molybdenum alloy comprises the following components by weight percent: 5-15% of Cr, 1.0-5.0% of Ti, 1.0-5.0%of Nb, 0.25-1.90% of C and the balance of molybdenum and inevitable impurities. Concerning the molybdenum alloy, the recrystallization temperature reaches 1200-1300 DEG C, the high-temperature creep resistance is 1.2-1.5 times that of the TZM molybdenum alloy, the high-temperature strength and hardness are 1.5-2.0 times those of the TZM molybdenum alloy and the wear resistance at 500-800 DEG C in the air is 1.5-2.0 times that of the TZM molybdenum alloy. The problem of poor wear resistance and oxidability of the traditional molybdenum alloy is simultaneously solved by adopting the molybdenum alloy formula, the preparation process is simple and is easily controlled, and the molybdenum alloy is prepared through conventional powder metallurgy; and therefore the molybdenum alloy has extensive application prospect.

Description

technical field [0001] The invention relates to a high-temperature oxidation-resistant and wear-resistant molybdenum alloy, and also relates to a preparation method of the molybdenum alloy. Background technique [0002] Molybdenum and its alloys have excellent properties such as high melting point, high high temperature strength, low high temperature creep rate, good thermal shock resistance, good wear resistance and corrosion resistance, and are widely used in chemical industry, metallurgical industry, metal processing and aerospace industry and nuclear energy technology. However, the disadvantages of poor high-temperature oxidation resistance and poor welding performance limit the wider use of molybdenum metal and its alloys as structural materials. [0003] The currently used molybdenum alloys are mainly TZM alloys, rare earth molybdenum alloys, and aluminum-silicon-potassium doped molybdenum alloys, each of which exhibits superior performance in different application fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C1/05
Inventor 徐流杰魏世忠马向东周玉成张国赏李继文李保元
Owner HENAN UNIV OF SCI & TECH
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