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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

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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 are prone to welding hot cracks; in addition, Fe 3 The strength of Al intermetallic compounds will drop sharply when the temperature exceeds 600 °C, and it is difficult to meet the trend of gas purification to higher temperatures and pressures

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

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Embodiment 1

[0023] The porous material for purifying high-temperature gas in this embodiment is composed of the following components in 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 as follows:

[0025] Step 1. Put industrially pure Ni, Cr, Al, Fe and Y into a 50kg vacuum induction melting furnace according to the proportioning ratio. -2 pa, smelting 4 times at 1400°C, each time for 10 minutes; then pour the smelted NiCrAl alloy liquid into the intermediate leakage bag preheated to 200°C, using high-pressure water atomization process, at the atomization pressure The alloy powder is made under the condition of 15MPa; the prepared powder is sieved into the following grades with a standard sieve: -60 mesh to +100 mesh, -100 mesh to +150 mesh, -150 mesh to +200 mesh, -200 mesh Mesh ~ +300 mesh and -300 mesh;

[0026] Step 2: P...

Embodiment 2

[0034] The porous material for purifying high-temperature gas in 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 as follows:

[0036] Step 1. Put industrially pure Ni, Cr, Al, Fe and Y into a 50kg vacuum induction melting furnace according to the proportioning ratio. -2 pa, smelting at 1700°C for 3 times, each time for 3 minutes; then pour the smelted NiCrAl alloy liquid into the intermediate leakage bag preheated to 200°C, using high-pressure water atomization process, at the atomization pressure The alloy powder is made under the condition of 25MPa; the prepared powder is sieved into the following grades with a standard sieve: -60 mesh to +100 mesh, -100 mesh to +150 mesh, -150 mesh to +200 mesh, -200 mesh Mesh ~ +300 mesh and -300 mesh;

[0037] Step 2: ...

Embodiment 3

[0044] The porous material for purifying high-temperature gas in this embodiment is composed of the following components in 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 as follows:

[0046] Step 1. Put commercially pure Ni, Cr, Al and Fe into a 50kg vacuum induction melting furnace according to the proportioning ratio, and put the industrially pure Ni, Cr, Al and Fe into a 50kg vacuum induction smelting furnace under a vacuum degree of not more than 10 -2 pa, smelting 4 times at 1600°C, each time for 5 minutes; then pour the smelted NiCrAl alloy liquid into the intermediate leakage bag preheated to 400°C, using high-pressure water atomization process, at the atomization pressure The alloy powder is made under the condition of 10MPa; the prepared powder is sieved into the following grades with a standard sieve: -60 mesh t...

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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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