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NiAl intermetallic compound porous material and preparation method thereof

An intermetallic compound and porous material technology, which is applied in the field of NiAl intermetallic compound porous materials and their preparation, can solve the problems of complex composition of porous materials, no reports of porous materials, and complicated processes, achieve excellent high-temperature mechanical properties, improve comprehensive performance, low energy consumption for preparation

Active Publication Date: 2009-02-04
CHENGDU INTERMENT TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction raw materials use a variety of elements, and NiAl (1-10%) is added as a diluent. The composition of the porous material is complicated, and the process is complicated and the cost is high.
[0005] So far, there is no report on nickel-aluminum intermetallic compound porous materials made of only Ni and Al powders

Method used

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  • NiAl intermetallic compound porous material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of NiAl intermetallic compound porous material of the present invention

[0024] Using Ni powder and Al powder with an average particle size of 80 μm and 90 μm respectively, mixing according to the composition ratio of Ni-15wt% Al (that is, the weight ratio of Al is 15%), and then performing ordinary molding under a pressure of 400MPa Forming into a sheet-like green body. The reaction synthesis adopts segmented vacuum pressureless sintering process, and the vacuum degree is 1.0~1.0×10 -1 Pa, first rise to 530°C with a heating rate of 5°C / min, and the holding time is 60min; then rise to 1250°C at a heating rate of 5°C / min, and hold for 60min; cool with the furnace to obtain the NiAl intermetallic compound of the present invention porous material. Its microstructure see figure 1 .

[0025] It is determined that the porosity of the NiAl intermetallic compound porous material is 42%, and the maximum pore diameter is 32 μm.

Embodiment 2

[0026] Example 2 Preparation of NiAl intermetallic compound porous material of the present invention

[0027] Using Ni powder and Al powder with an average particle size of 10 μm and 5 μm respectively, mixing according to the composition ratio of Ni-20wt% Al, and then performing ordinary compression molding under a pressure of 100 MPa to make a sheet-shaped green body. The reaction synthesis adopts segmented vacuum pressureless sintering process, and the vacuum degree is 1.0×10 -1 ~1.0×10 -2 Pa, first rise to 550°C with a heating rate of 4°C / min, and the holding time is 90min; then rise to 1100°C at a heating rate of 7°C / min, and hold for 90min; cool with the furnace to obtain the NiAl intermetallic compound of the present invention porous material.

[0028] It is determined that the porosity of the NiAl intermetallic compound porous material is 35%, and the maximum pore diameter is 15 μm.

Embodiment 3

[0029] Example 3 Preparation of NiAl intermetallic compound porous material of the present invention

[0030] Using Ni powder and Al powder with an average particle size of 60 μm and 50 μm respectively, mixing according to the composition ratio of Ni-30wt% Al, and then performing cold isostatic pressing under a pressure of 200 MPa to form a tubular body. The reaction synthesis adopts segmented vacuum pressureless sintering process, and the vacuum degree is 1.0×10 -1 ~1.0×10 -2 Pa, first rise to 470°C with a heating rate of 3°C / min, and the holding time is 120min; then rise to 1000°C at a heating rate of 8°C / min, and hold for 90min; cool with the furnace to obtain the NiAl intermetallic compound of the present invention porous material.

[0031] It has been determined that the porosity of the NiAl intermetallic compound porous material is 43%, and the maximum pore diameter is 22 μm.

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Abstract

The invention relates to a NiAl intermetallic compound porous material and a preparation method thereof, which belong to the field of inorganic materials. The invention provides a NiAl intermetallic compound porous material with good combination property and a preparation method thereof. The novel NiAl intermetallic compound porous material has communicated three-dimension solid network apertures and the porosity of 30 percent and 55 percent, the biggest pore is from 5 microns and 50 microns; wherein, the atom weight portions of Ni and Al in the material is equal to 60 to 90 : 10 to 40. The preparation method is that Ni and Al powders with a certain granularity are firstly mechanically mixed evenly, and then go through compression molding cold forming, finally the porous material is obtained by a sectional type vacuum pressureless sintering mode. The method has low energy consumption and almost no contamination, and the porous structures can be controlled independently. The NiAl intermetallic compound porous material of the invention has excellent high-temperature mechanical properties, good acid-resistance and alkali-resistance properties, high-temperature oxidation resistance property and excellent filtering quality, and can be used in the fields such as high temperature, separation and the like.

Description

technical field [0001] The invention relates to a NiAl intermetallic compound porous material and a preparation method thereof, belonging to the field of inorganic materials. Background technique [0002] Porous material devices with three-dimensional interconnected pores are widely used in various engineering and technical fields such as metallurgy, chemical industry, pharmaceuticals, seawater desalination and coarse filtration, solid fuel cells, water purification, environmental protection, and energy. The currently used porous materials mainly include inorganic porous materials and organic porous materials. Among them, inorganic porous materials have been widely used due to their relatively high mechanical properties, relatively good heat resistance and environmental corrosion resistance. application. According to the types of materials, inorganic porous materials can be divided into metal porous materials and ceramic porous materials. Ceramic porous materials have exce...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C1/04C22C19/00
Inventor 高麟贺跃辉徐进辉汪涛
Owner CHENGDU INTERMENT TECH
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