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Method for preparing aluminum-alloyed combined aluminum oxide compound molybdenum disilicide material

A kind of technology of aluminum oxide and molybdenum disilicide

Inactive Publication Date: 2012-06-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of method for preparing aluminum alloy combined with aluminum oxide composite molybdenum disilicide material, hoping to solve the problem of MoSi 2 The problem of poor room temperature toughness and low high temperature strength, and the method is simple, the equipment is simple, and the synthesis speed is fast

Method used

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  • Method for preparing aluminum-alloyed combined aluminum oxide compound molybdenum disilicide material
  • Method for preparing aluminum-alloyed combined aluminum oxide compound molybdenum disilicide material
  • Method for preparing aluminum-alloyed combined aluminum oxide compound molybdenum disilicide material

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Experimental program
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Embodiment 1

[0014] Embodiment 1. with molybdenum powder, silicon powder, aluminum powder and molybdenum trioxide powder, according to 32.8mol% Mo, 65.6mol% Si, 1.3mol% Al, 0.3mol% MoO 3 The molar ratio is mixed evenly, the mixed powder is pressed into a green body, the green body is put into a self-made combustion synthesis device, and the powder green body is ignited in a protective atmosphere environment, and a chemical reaction occurs to synthesize aluminum alloy and compound aluminum oxide. Molybdenum disilicide based composites.

Embodiment 2

[0015] Embodiment 2. with molybdenum powder, silicon powder, aluminum powder and molybdenum trioxide powder, according to 27.8mol% Mo, 59.2mol% Si, 9.7mol% Al, 3.3mol% MoO 3 The molar ratio is mixed evenly, the mixed powder is pressed into a green body, the green body is put into a self-made combustion synthesis device, and the powder green body is ignited in a protective atmosphere environment, and a chemical reaction occurs to synthesize aluminum alloy and compound aluminum oxide. Molybdenum disilicide based composites.

Embodiment 3

[0016] Embodiment 3. with molybdenum powder, silicon powder, aluminum powder and molybdenum trioxide powder, according to 27.9mol% Mo, 56.0mol% Si, 12.8mol% Al, 3.3mol% MoO 3 The molar ratio is mixed evenly, the mixed powder is pressed into a green body, the green body is put into a self-made combustion synthesis device, and the powder green body is ignited in a protective atmosphere environment, and a chemical reaction occurs to synthesize aluminum alloy and compound aluminum oxide. Molybdenum disilicide based composites.

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Abstract

The invention discloses a method for preparing an aluminum-alloyed combined aluminum oxide compound molybdenum disilicide material, which belongs to the technical field of high-temperature structural materials. A process of the method comprises the following steps of: uniformly mixing molybdenum powder, silicon powder, aluminum powder and molybdenum trioxide powder in the molar ratio of (15.6-32.8):(42.0-65.6):(1.3-31.8):(0.3-10.6) among Mo, Si, Al and MoO3; preparing mixed powder into a blank; putting the blank into a self-manufactured combustion synthesis device; vacuumizing and exhausting air; igniting the mixed powder blank in a protective atmosphere or a vacuum environment; and undergoing a chemical reaction to synthesize the aluminum-alloyed combined aluminum oxide compound molybdenum disilicide-based composite material. In the method, the aluminum-alloyed combined compound molybdenum disilicide composite material is synthesized by adopting a combustion synthesis technology witha one-step method, and second-phase aluminum oxide and the substrate are combined metallically, so that the improvement on final material performance is facilitated; and moreover, the method has the advantages of simple process, easy and convenient equipment, time saving, energy saving, low cost and low pollution.

Description

technical field [0001] The invention belongs to the technical field of high-temperature structural materials, and in particular relates to a method for preparing a compounded molybdenum disilicide material combined with aluminum alloying and aluminum oxide. Background technique [0002] MoSi 2 It is known for its high melting point, excellent high temperature oxidation resistance, moderate density, good thermal conductivity, electrical discharge machining, good wear resistance, high thermal shock resistance and valuable R characteristics. It is considered to be a very promising high-temperature (1200-1600°C) structural material. But MoSi 2 There are three major defects of low room temperature toughness, insufficient high temperature creep resistance, and low temperature accelerated oxidation, that is, the "Pesting" phenomenon, which limits its application as a structural material. After more than a century of development, MoSi 2 The low-temperature "Pesting" phenomenon h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/18C22C1/05
Inventor 王晓虹冯培忠郭瑞霞顾永琴牛继南强颍怀
Owner CHINA UNIV OF MINING & TECH