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Method for preparing and synthesizing NbCr2 intermetallic compound porous material through reaction of Cr powder and Nb powder

A technology of intermetallic compounds and porous materials, applied in the field of powder metallurgy, to achieve the effect of excellent permeability and uniform pores

Inactive Publication Date: 2014-02-19
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the preparation methods of porous materials mainly include sintering method, melt solidification method, adding pore-forming agent method, chemical corrosion method, self-propagating high-temperature synthesis method, etc., but these methods have their own advantages and disadvantages. has certain limitations

Method used

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  • Method for preparing and synthesizing NbCr2 intermetallic compound porous material through reaction of Cr powder and Nb powder
  • Method for preparing and synthesizing NbCr2 intermetallic compound porous material through reaction of Cr powder and Nb powder

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Put 104g of Cr powder and 93g of Nb powder (atomic percentage is Cr:Nb=2:1) ​​together with balls into a ball mill jar and seal it, and mill it for 12 hours; then add 10g of paraffin wax to the fully mixed powder, mix well, weigh Take a small sample and press it on a desktop powder tablet press under 135MPa pressure to form a sheet-like compact with a diameter of 15mm and a thickness of 5mm, and dry it at 100°C for 2h; ℃ / min, first raise it to 500℃ and keep it warm for 1 hour to make the paraffin completely volatilize; then adjust the heating rate to 10℃ / min, keep it at 1600℃ for 4 hours, so that the Cr powder and Nb powder can fully react to form the intermetallic compound NbCr 2 .

Embodiment 2

[0021] Put 104g of Cr powder and 93g of Nb powder together with the balls into the ball mill jar and seal it, and mill it for 25 hours; then add 5g of PVA to the fully mixed powder, after mixing evenly, weigh a small sample and place it on a desktop powder tablet press under a pressure of 500MPa Pressed into sheet-shaped compacts with a diameter of 15mm and a thickness of 5mm, and dried at 100°C for 2 hours; the compact was sintered in a vacuum sintering furnace using a segmented sintering process, with a heating rate of 5°C / min, first raised to 200°C for 2 hours , to completely volatilize the paraffin; then adjust the heating rate to 15°C / min, and keep it at 1400°C for 2 hours, so that Cr powder and Nb powder can fully react to form the intermetallic compound NbCr 2 .

Embodiment 3

[0023] 104g of Cr powder and 93g of Nb powder are packed into the ball milling jar together with the balls and sealed, and ball milled for 20 hours; then add 6g of sodium stearate to the fully mixed powder, after mixing evenly, take a small sample and place it on a desktop powder tablet press Under the pressure of 400MPa, it is pressed into a sheet-shaped compact with a diameter of 15mm and a thickness of 5mm, and dried at 100°C for 2 hours; the compact is sintered in a vacuum sintering furnace using a segmented sintering process, and the heating rate is 5°C / min, first raised to 400°C Keep warm for 3 hours to completely volatilize the paraffin; then adjust the heating rate to 10°C / min and keep warm at 1500°C for 3 hours to fully react Cr powder and Nb powder to form the intermetallic compound NbCr 2 .

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Abstract

The invention discloses a method for preparing and synthesizing an NbCr2 intermetallic compound porous material through a reaction of Cr powder and Nb powder. The method comprises the steps as follows: 1), the Cr powder and the Nb powder which have the atomic percent of 2:1 and a grinding ball are placed into a ball grinding tank, the tank is sealed, and ball grinding is performed; 2), a proper quantity of a binding agent is added into the fully-mixed powder, and the mixture is pressed into sheet briquettes after uniform mixing; and 3), briquette-pressing is performed, a sectional type sintering process is adopted, and sintering is performed in a vacuum sintering furnace, so that the Cr powder and the Nb powder have a reaction fully, so that the intermetallic compound NbCr2 is formed. According to the method, the Laves-phase NbCr2 intermetallic compound porous material is synthesized, and the porosity of the synthesized porous material reaches 35%-55%.

Description

[0001] technical field [0002] The invention relates to a powder metallurgy method, in particular to a reaction synthesis of chromium and niobium powder to prepare NbCr 2 A method for intermetallic porous materials. Background technique [0003] At present, the porous ceramic materials widely used as high-temperature filter materials are damaged due to thermal stress during use due to their inherent high brittleness and low thermal shock resistance, which brings huge hidden dangers to production. Although porous metal materials have good toughness, their high-temperature mechanical properties and high-temperature oxidation resistance are poor, and they are not qualified for the purification of high-temperature flue gas. Therefore, it is of great significance to develop new high-performance porous filter materials for high-temperature flue gas filtration. [0004] An intermetallic compound is a compound between ceramics and metals, and has many special physical, chemical a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C27/00
Inventor 郑海忠刘显理王宵方超
Owner NANCHANG HANGKONG UNIVERSITY
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