Porous material for purifying high-temperature gas and preparation method thereof

A porous material and high-temperature gas technology, applied in the field of powder metallurgy, can solve problems such as difficult gas purification, difficult welding of porous materials, welding hot cracks, etc., to achieve good weldability, excellent corrosion resistance in high-temperature and complex atmospheres, and reduce burning loss Effect

Active Publication Date: 2012-06-13
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Fe 3 Al intermetallic compound porous materials are difficult to weld, and welding cold cracks are easy to occur in media containing hydrogen such as water vapor, and high thermal expansion coefficient and low thermal conductivity a

Method used

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  • Porous material for purifying high-temperature gas and preparation method thereof
  • Porous material for purifying high-temperature gas and preparation method thereof
  • Porous material for purifying high-temperature gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] The porous material for high-temperature gas purification in this embodiment is composed of the following components by mass percentage: Cr 15%, Al 8%, Fe 2%, Y 0.05%, and the balance is Ni and unavoidable impurities.

[0024] The preparation method of the porous material for high-temperature gas purification in this embodiment is:

[0025] Step 1. Put the industrial pure Ni, Cr, Al, Fe and Y into a 50kg vacuum induction melting furnace according to the proportion, and the vacuum degree is not more than 10 -2 pa, smelted 4 times under the condition of 1400℃, each smelting 10min; then pour the smelted NiCrAl alloy liquid into the tundish which is preheated to 200℃, adopt high-pressure water atomization process, under the atomization pressure The alloy powder is made under the condition of 15MPa; the powder is divided into the following grades with a standard sieve: -60 mesh ~ +100 mesh, -100 mesh ~ +150 mesh, -150 mesh ~ +200 mesh, -200 Mesh ~ +300 mesh and ...

Example Embodiment

[0033] Example 2

[0034] The porous material for high-temperature gas purification of this embodiment is composed of the following components by mass percentage: Cr 20%, Al 12%, Fe 3%, Y 0.1%, and the balance is Ni and unavoidable impurities.

[0035] The preparation method of the porous material for high-temperature gas purification in this embodiment is:

[0036] Step 1. Put the industrial pure Ni, Cr, Al, Fe and Y into a 50kg vacuum induction melting furnace according to the proportion, and the vacuum degree is not more than 10 -2 pa, smelt 3 times under the condition of 1700℃, each smelting 3min; then pour the smelted NiCrAl alloy liquid into the tundish which is preheated to 200℃, adopt high-pressure water atomization process, under the atomization pressure The alloy powder is made under the condition of 25MPa; the powder is divided into the following grades with a standard sieve: -60 mesh ~ +100 mesh, -100 mesh ~ +150 mesh, -150 mesh ~ +200 mesh, -200 Mesh ~ +300 mesh and -30...

Example Embodiment

[0043] Example 3

[0044] The porous material for high-temperature gas purification of this embodiment is composed of the following components by mass percentage: Cr 10%, Al 5%, Fe 1%, and the balance is Ni and unavoidable impurities.

[0045] The preparation method of the porous material for high-temperature gas purification in this embodiment is:

[0046] Step 1. Put the industrial pure Ni, Cr, Al and Fe into a 50kg vacuum induction melting furnace according to the proportion, and the vacuum degree is not more than 10 -2 pa, smelted 4 times under the condition of 1600℃, each smelting 5min; then pour the smelted NiCrAl alloy liquid into the tundish which is preheated to 400℃, adopt high pressure water atomization process, under the atomization pressure The alloy powder is prepared under the condition of 10MPa; the prepared powder is divided into the following grades with a standard sieve: -60 mesh ~ +100 mesh, -100 mesh ~ +150 mesh, -150 mesh ~ +200 mesh, -200 Mesh ~ +300 mesh and ...

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Abstract

The invention discloses a porous material for purifying high-temperature gas, which is prepared from the following components in percentage by mass: 10-20% of Cr, 5-12% of Al, 1-3% of Fe, 0-0.1% of Y and the balance of Ni and inevitable impurities. The invention also discloses a preparation method of the porous material. Since the principal elements of the porous material are high-temperature alloy principal elements Ni and Cr, the porous material has the advantages of high strength, good toughness and good weldability in the high-temperature alloy, and the maximum application temperature is up to 800 DEG C; and since high-content Al is added, a compact and stable aluminum oxide film is formed on the surface of the pore walls of the porous material in the application process, thereby ensuring the excellent corrosion resistance under the conditions of high temperature and complex atmosphere. The powder classification and pressing technique ensures the uniformity of the porous material;and by adopting the vacuum sintering technique, the porous material has favorable comprehensive properties in the aspects of strength, toughness and filtering quality.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a porous material for purifying high-temperature gas and a preparation method thereof. Background technique [0002] In the process of modern industrial production, there are a wide range of fields involving direct purification and efficient utilization of dusty gas at high temperatures, such as high-temperature gas purification of clean coal combined cycle power generation systems, filtration of high-temperature gases in petroleum catalytic cracking units, and recovery of catalysts. Automobile exhaust gas purification, high-temperature flue gas purification of waste incinerators, flue gas purification of cement industry kiln head / kiln tail, blast furnace / converter gas purification in steel industry, etc. How to achieve the high-efficiency dust removal of the above-mentioned high-temperature and high-pressure gas is of great significance to energy saving, em...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C19/05C22C1/02B22F9/08
Inventor 王建汤慧萍杨保军李亚宁王建永汪强兵谈萍陈金妹杨和平李艳军
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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