Porous NiAl/Al2TiO5 composite material and preparation method thereof

A composite material and porous material technology, which is applied in the field of material synthesis and processing, can solve the problem of limited application fields, small adjustment ranges of porosity and thermal expansion coefficient of porous materials, and it is difficult to meet the high temperature resistance, thermal conductivity and thermal conductivity of automobile exhaust purifier carriers. Thermal shock resistance comprehensive performance requirements and other issues

Active Publication Date: 2011-10-12
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are the following disadvantages: (1) Pure NiAl intermetallic compound materials or Al2TiO5 ceramic materials are difficult to meet the comprehensive performance requirements of high temperature resistance, ther

Method used

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  • Porous NiAl/Al2TiO5 composite material and preparation method thereof
  • Porous NiAl/Al2TiO5 composite material and preparation method thereof
  • Porous NiAl/Al2TiO5 composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The first step: powder raw material preparation

[0055] Prepare industrially pure Ni, Al, TiO 2 、Al 2 o 3 , C powder raw materials, including Ni, TiO 2 、Al 2 o 3 , C powder particle size is 200 mesh, Al powder particle size is 100 mesh.

[0056] Step Two: Al 2 TiO 5 powder synthesis

[0057] TiO 2 、Al 2 o 3 Powder according to molar ratio TiO 2 : Al 2 o 3 = 1: 1 (mol) weighing, mixed on a planetary ball mill for 4 hours, packed into a mould, adopted a compression molding method, and applied a pressure of 50MPa to make a cylindrical compact of Φ20mm and a height of 20mm. Put the green compact in a resistance furnace for sintering, the sintering process is 1450℃×2h, and the product Al is first obtained through the sintering reaction 2 TiO 5 , and then the sintered Al 2 TiO 5 The green body is crushed and ball milled into a powder with a particle size of 200 mesh for later use;

[0058] The third step: Ni+Al powder preparation

[0059] Weigh the Ni and...

Embodiment 2

[0070] The difference with Example 1 is that in the ratio of raw materials Al 2 TiO 5 The content is 20%, namely (Ni+Al):Al 2 TiO 5 (wt%)=80:20; the carbon powder content is 10% of the total mass of the reaction system, and the reaction in the whole compact is completed within 5 to 7 seconds. The relevant properties of the product are shown in Table 2.

[0071] Table 2

[0072] Raw material ratio (Ni+Al): Al 2 TiO 5 (wt%)

Embodiment 3

[0074] The difference with Example 2 is that in the ratio of raw materials Al 2 TiO 5 The content is 30%, namely (Ni+Al):Al 2 TiO 5 (wt%)=70:30, the relevant properties of the product are shown in Table 3, and the microscopic appearance of the product is shown in figure 2 .

[0075] table 3

[0076] Raw material ratio (Ni+Al): Al 2 TiO 5 (wt%)

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Abstract

The invention discloses a porous NiAl/Al2TiO5 composite material and a preparation method thereof. Industrially pure Ni, Al, TiO2 and Al2O3 powder are used as raw materials of the composite material. The preparation method comprises the following steps of: performing high-temperature sintering reaction (TiO2+Al2O3=Al2TiO5) to synthesize Al2TiO5, mixing the crushed Al2TiO5 and Ni and Al powder, adding C powder serving as a pore forming agent and a heat generating agent, uniformly mixing the raw materials, pressing the mixture into a blank, and performing self-propagating high-temperature synthesis reaction to generate the porous composite material consisting a NiAl phase and a Al2TiO5 phase. The adjustable ranges of the strength, the porosity and the thermal expansion coefficient of the porous composite material are large; and the production process is simple, the yield is high, and the porous composite material can be used as a carrier and a filter in catalysis and environmental purification.

Description

technical field [0001] The present invention relates to a kind of porous material and preparation technology thereof, especially a kind of porous NiAl / Al 2 TiO 5 A composite material and a preparation method thereof belong to the field of material synthesis and processing. Background technique [0002] Today, reducing vehicle exhaust emissions and protecting the environment is the focus of attention worldwide. At present, the catalyst carrier materials used for the purification of automobile exhaust gas mainly include ceramics and metals. In order to immobilize the catalyst, a layer of γ-Al with high specific surface area is usually uniformly coated on the surface of the carrier 2 o 3 coating, and then the precious metal active catalyst components are supported on the surface. For metal supports, because γ-Al 2 o 3 The thermal expansion coefficient of the coating and the metal substrate is quite different, which will easily cause the coating and catalyst to fall off f...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C1/08B01D39/20B01J32/00B01J35/04F01N3/022F01N3/28
Inventor 崔洪芝曹丽丽葛传良姜琳谷征征
Owner SHANDONG UNIV OF SCI & TECH
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