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Preparation method for porous NiAl intermetallic compound

A technology of intermetallic compounds and alloys, applied in the field of porous materials, to achieve the effects of easy shape control, excellent high temperature oxidation resistance and high efficiency

Inactive Publication Date: 2012-02-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]The process and principle of mixed powder partial diffusion reaction synthesis sintering process and principle are as follows: nickel powder and aluminum powder are uniformly mixed, the mixed powder is pressed into a billet and vacuum sintered, and the The Kirkendal partial diffusion effect in the process realizes porosity. The disadvantages of this preparation method are as follows: (1) powder is used as raw material, and vacuum sintering is required. The shortcomings of the powder metallurgy process itself make the preparation process complicated and costly. The volume and output of the prepared material are limited; (2) The macroscopic size expansion of the sintered body has an adverse effect on the preparation of complex components; (3) The phase structure of the obtained porous Ni-Al intermetallic compound is not uniform, and NiAl will appear at the same time And NiAl phase, if you want to eliminate phase inhomogeneity, you need a long time high temperature diffusion treatment

Method used

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  • Preparation method for porous NiAl intermetallic compound
  • Preparation method for porous NiAl intermetallic compound
  • Preparation method for porous NiAl intermetallic compound

Examples

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Effect test

Embodiment 1

[0033] (1) Preparation of nickel-aluminum alloy melt: adopt industrial pure nickel and industrial pure aluminum as raw materials, prepare nickel-aluminum alloy according to the mass percentage of industrial pure nickel as 66%, and the mass percentage of industrial pure aluminum as 34%. The industrially pure nickel and industrially pure aluminum after batching are heated to 1640°C for melting and kept for 30 minutes to obtain a nickel-aluminum alloy melt;

[0034] (2) Liquid-solid phase control of the nickel-aluminum alloy melt: add SiC fibers with a melt volume content of 2% to the nickel-aluminum alloy melt prepared in step (1) (the diameter of the SiC fiber is 0.5 μm, and the SiC fiber The length of the fiber is 1cm), and stirred for 3 minutes at a stirring speed of 1000 rpm, so that the SiC fibers were evenly dispersed in the nickel-aluminum alloy melt; the temperature of the nickel-aluminum alloy melt containing the SiC fiber was reduced to 1585 ° C and After 20 minutes of...

Embodiment 2

[0037] (1) Preparation of nickel-aluminum alloy melt: using industrial pure nickel and industrial pure aluminum as raw materials, according to the mass percentage of industrial pure nickel is 68%, the mass percentage of industrial pure aluminum is 32% to prepare nickel-aluminum alloy, will After batching, the industrial pure nickel and industrial pure aluminum are heated to 1650°C for melting and kept for 30 minutes to obtain a nickel-aluminum alloy melt;

[0038] (2) Liquid-solid phase control of the nickel-aluminum alloy melt: Add SiC fibers with a melt volume content of 3% to the nickel-aluminum alloy melt prepared in step (1) (the diameter of the SiC fiber is 1 μm, and the SiC fiber length of 2cm), stirred at a stirring speed of 700 rpm for 4 minutes, so that the SiC fibers were evenly dispersed in the nickel-aluminum alloy melt; the temperature of the nickel-aluminum alloy melt containing SiC fibers was reduced to 1615°C and kept In 20 minutes, the β′ solid phase (NiAl ph...

Embodiment 3

[0041] (1) Preparation of nickel-aluminum alloy melt: adopt industrial pure nickel and industrial pure aluminum as raw materials, prepare nickel-aluminum alloy according to the mass percentage of industrial pure nickel as 73%, and the mass percentage of industrial pure aluminum as 34%. After batching, the industrial pure nickel and industrial pure aluminum are heated to 1720°C for melting and kept for 30 minutes to obtain a nickel-aluminum alloy melt;

[0042](2) Liquid-solid phase control of the nickel-aluminum alloy melt: Add SiC fibers with a melt volume content of 4% to the nickel-aluminum alloy melt prepared in step (1) (the diameter of the SiC fiber is 2 μm, and the SiC fiber length is 3cm), stirred at a stirring speed of 500 rpm for 5 minutes, so that the SiC fibers were evenly dispersed in the nickel-aluminum alloy melt; the temperature of the nickel-aluminum alloy melt containing SiC fibers was reduced to 1600°C and kept In 20 minutes, the β′ solid phase (NiAl phase) ...

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Abstract

The invention discloses a preparation method for a porous NiAl intermetallic compound, and belongs to the field of porous materials. The method comprises the following steps of: dosing nickel-aluminum alloy according to a certain mass percentage; heating until the alloy is molten, preserving heat and then adding SiC fiber; then cooling the alloy melt to a liquid and solid two-phase region for thermal insulation; and finally, separating a liquid phase under reduced pressure from semi-solid alloy obtained by thermal insulation and cooling to obtain the porous NiAl intermetallic compound. A product has an easily controlled shape, a simple and uniform component of organization and a controllable pore structure. The preparation method provided by the invention has the characteristics of high efficiency, low cost and capability of realizing industrial production.

Description

Technical field: [0001] The invention relates to a liquid-solid phase controlled separation preparation process of NiAl porous intermetallic compounds, which belongs to the field of porous materials. Background technique: [0002] Porous NiAl intermetallic compound, its matrix NiAl intermetallic compound has excellent high temperature oxidation resistance, and its oxidation resistance limit can reach 1250 ℃, NiA1 intermetallic compound also has better corrosion resistance than stainless steel, Ni-Al is prepared into a porous After materials, it has broad application prospects in aerospace lightweight high-temperature structural materials, automobile exhaust treatment, industrial wastewater treatment, catalyst carriers and other fields. [0003] The currently known preparations of porous Ni-Al intermetallic compounds mainly include: self-propagating high-temperature synthesis (SHS) and mixed powder partial diffusion reaction synthesis and sintering methods. [0004] Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/08C22C49/08C22C49/14C22C101/14
Inventor 左孝青陆建生周芸刘荣佩杨滨陈冬华陈显宁
Owner KUNMING UNIV OF SCI & TECH
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