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Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof

A molybdenum disilicide and aluminum alloy technology, applied in the field of intermetallic compounds, can solve the problems of insignificant contribution to the fracture toughness at room temperature, and achieve the effects of low cost, reduced residual and reduced pollution

Inactive Publication Date: 2013-04-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the existing results, the contribution of Al alloying to room temperature fracture toughness is not obvious.

Method used

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  • Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof
  • Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof
  • Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1. Mix the powders of molybdenum, niobium, silicon, and aluminum according to the molar ratio of 33.3mol% Mo, 0mol% Nb, 66.7mol% Si, and 0mol% Al, and press the mixed powder into a green body, and put the green body into In the combustion synthesis reaction device, the powder green body is ignited in an argon atmosphere environment, and the reaction occurs to synthesize MoSi 2 . After sintering and densification, its high temperature strength reaches 118MPa.

Embodiment 2

[0017] Embodiment 2. Mix the powders of molybdenum, niobium, silicon, and aluminum according to the molar ratio of 32.301mol% Mo, 0.999mol% Nb, 66.7mol% Si, and 0mol% Al, and press the mixed powder into a green body, and put the green body into the combustion synthesis reaction device, and ignite the powder green body in the hydrogen atmosphere environment, and the reaction synthesis (Mo 0.97 Nb 0.03 ) Si 2 .

Embodiment 3

[0018] Embodiment 3. Mix the powders of molybdenum, niobium, silicon, and aluminum according to the molar ratio of 30.303mol% Mo, 2.997mol% Nb, 66.7mol% Si, and 0mol% Al, and press the mixed powder into a green body, and put the green body Into the combustion synthesis reaction device, ignite the powder green body in the nitrogen atmosphere environment, and the reaction synthesis (Mo 0.91 Nb 0.09 ) Si 2 .

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Abstract

The invention relates to a niobium-aluminum alloying molybdenum disilicide material and a preparation method thereof, and belongs to the technical field of intermetallic compounds. The chemical formula of the niobium-aluminum alloying molybdenum disilicide material is (Mo1-xNbx)(Si1-yAly)2, wherein X ranges from 0 to 0.15, and Y ranges from 0 to 0.15. The preparation method comprises the following steps of: uniformly mixing molybdenum, niobium, silicon and aluminum powder at a mole ratio of (28.305-33.3):(0-4.995):(56.695-66.7):(0-10.005); then pressing the mixture into a blank; and placing the blank into a combustion synthesis device, and igniting the blank in a protective atmosphere to synthesize the niobium-aluminum alloying molybdenum disilicide material. Compared with the prior art, the niobium-aluminum alloying molybdenum disilicide material disclosed by the invention can be synthesized through a one-step method and has the advantages of good high-temperature strength, simple process and equipment, time and energy conservation, low cost and less pollution.

Description

technical field [0001] The invention belongs to the technical field of intermetallic compounds, and in particular relates to a niobium and aluminum alloyed molybdenum disilicide material and a preparation method thereof. Background technique [0002] MoSi 2 With its high melting point (2030°C), moderate density (6.24g cm －3 ), good electrical and thermal conductivity (resistivity 21.50×10 －6 Ω·cm, thermal conductivity 25W·m －1 ·K －1 ), lower coefficient of thermal expansion (8.1×10 －6 K －1 ), excellent high-temperature oxidation resistance (anti-oxidation temperature up to 1600 ° C), and other advantages, it is considered to be a very competitive high-temperature structural candidate material after Ni-based superalloys, TiAl-based compounds and structural ceramics. MoSi 2 As an electric heating element, the maximum operating temperature in the air has reached 1800 ° C, however, MoSi 2 The practical progress as a structural material is still relatively slow, mainly be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/18
Inventor 王晓虹陆琼朱高明吴光志孙智冯培忠
Owner CHINA UNIV OF MINING & TECH
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