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Method of preparing nickel-aluminum base alloy porous material

A porous material, nickel-aluminum-based technology, applied in the field of preparation of nickel-aluminum-based alloy porous materials, can solve the problems of uncontrollable pore size, uneven pore distribution, and non-free adjustment of porosity, so as to reduce the preparation cost and facilitate detachment. In addition, the effect of small degree of pollution

Active Publication Date: 2008-09-10
江西咏泰粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous nickel-aluminum-based alloys produced in the above studies all have the following problems: 1. The pore size is uncontrollable; 2. The pore distribution is uneven; 3. The porosity cannot be adjusted freely.

Method used

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  • Method of preparing nickel-aluminum base alloy porous material
  • Method of preparing nickel-aluminum base alloy porous material
  • Method of preparing nickel-aluminum base alloy porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Ni powder with a particle size of 1-10 μm, Al powder with a particle size of 10-100 μm and NaCl powder with a particle size of 100-200 μm are used, and Ni:Al:NaCl is proportioned according to the mass ratio of 6.5:1:3. Molding or cold isostatic pressing under a pressure of 500Mpa to make a cold compact with a diameter of d 50mm×5mm, then place it in a vacuum sintering furnace, control the vacuum degree to 0.1~10Pa, and raise the temperature at a rate of 5~20°C Sintering at 500~650°C, holding time: 1~4h, then continue to heat up to 800~950°C at a rate of 5~20°C, keep warm for 1~4h, and finally, still heat up to 1000 at a rate of 5~20°C ℃, heat preservation for 1~4h, and then cool in the furnace to prepare a porous nickel-aluminum-based alloy material with a size of d 50mm×5mm, and its porosity is 60.5%.

Embodiment 2

[0034] Embodiment 2: Ni powder with a particle size of 1-10 μm, Al powder with a particle size of 10-100 μm and NaCl powder with a particle size of 100-200 μm are used, and Ni:Al:NaCl is proportioned according to the mass ratio of 6.5:1:7.5, Molding or cold isostatic pressing under a pressure of 500Mpa to make a cold compact with a diameter of d50mm×5mm, then place it in a vacuum sintering furnace, control the vacuum degree to 0.1~10Pa, and raise the temperature at a rate of 5~20°C to Sintering at 500~650°C, holding time: 1~4h, then continue to heat up to 800~950°C at a rate of 5~20°C, hold for 1~4h, and finally, still heat up at a rate of 5~20°C to change to 1000°C, heat preservation for 1~4h, and then cooling in the furnace to prepare a porous nickel-aluminum-based alloy material with a size of d 50mm×5mm, and its porosity is 71%.

Embodiment 3

[0035] Embodiment 3: Ni powder with a particle size of 1-10 μm, Al powder with a particle size of 10-100 μm and NaCl powder with a particle size of 100-200 μm are used, and the ratio of Ni:Al:NaCl is 6.5:1:23 by mass, Molding or cold isostatic pressing under a pressure of 500Mpa to make a cold compact with a diameter of d50mm×5mm, then place it in a vacuum sintering furnace, control the vacuum degree to 0.1~10Pa, and raise the temperature at a rate of 5~20°C to Sintering at 500~650°C, holding time: 1~4h, then continue to heat up to 800~950°C at a rate of 5~20°C, hold for 1~4h, and finally, still heat up to 1000°C at a rate of 5~20°C , heat preservation for 1~4h, and then cooled with the furnace to prepare a porous nickel-aluminum-based alloy material with a size of d50mm×5mm and a porosity of 90%.

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Abstract

The invention provides a method for preparing a nickel-aluminium base alloy cellular material. Ni powder with a grain diameter ranging from 1 to 10 mu m, aluminium powder with a grain diameter ranging from 10 to 100 mu m and sodium chloride with a grain diameter ranging from 0.01 to 1 millimeter are mixed according to certain weight percentage and are cold pressed and molded at a pressure of 500 to 600 MPa; next, the mixture is low-temperature sintered at 500 DEG C to 650 DEG C; afterwards, a pore-forming agent is removed at an intermediate temperature ranging from 800 DEG C to 950 DEG C; finally, the mixture is high sintered at 1000 DEG C to ensure that the intermetallic compound completely forms Ni3Al phase. The technique method is simple, has convenient operation, low production cost, controllable sizes of pores, evenly distributed pores and adjustable degree of porosity, is suitable for the industrial production, protects the environment and can replace the prior cellular reactor material production technique.

Description

technical field [0001] The invention relates to a preparation method of a nickel-aluminum base alloy porous material. Background technique [0002] A porous reactor is a carrier with a porous structure that can be used for various chemical reactions. Compared with traditional reactors, this reactor has many advantages such as high specific surface area, high thermal conductivity and high mass mobility. In recent years, porous reactors have attracted great attention of researchers as a compact and efficient hydrogen production system. [0003] Under normal circumstances, the porous reactor uses stainless steel and silicon-based materials as structural plates, and at the same time, porous support materials and activated catalysts are plated on the structural plates by complex chemical sputtering methods. However, due to the poor heat insulation performance of stainless steel and the low formability and mechanical strength of silicon-based materials, the performance of the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 刘咏何晓宇刘彬李为张伟
Owner 江西咏泰粉末冶金有限公司
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