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In-situ authigenic mullite whister reinforced aluminum titanate porous ceramic material and preparation method thereof

A technology of mullite whiskers and porous ceramics, applied in the field of porous ceramic materials, can solve the problems of low strength and uneven pore size distribution, and achieve the effects of high strength, good thermal and chemical stability, and simple process

Inactive Publication Date: 2013-11-06
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of uneven pore size distribution and low strength in the existing aluminum titanate porous ceramic materials, and to provide an aluminum titanate porous ceramic material reinforced by in-situ synthesis of authigenic mullite whiskers to meet the needs of industrial high-temperature smoke Requirements for carrier materials used in air filtration and purification treatment of motor vehicle exhaust

Method used

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  • In-situ authigenic mullite whister reinforced aluminum titanate porous ceramic material and preparation method thereof
  • In-situ authigenic mullite whister reinforced aluminum titanate porous ceramic material and preparation method thereof

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Effect test

Embodiment 1

[0023] Embodiment 1: it is 10% to carry out batching with the mass percentage that mullite content accounts for total mass

[0024] First, weigh the raw materials according to the following proportions: 6% of α-alumina, 54% of pseudoboehmite, 32% of titanium dioxide, 2% of silicon micropowder, 3% of aluminum fluoride, and 3% of stabilizer. Mix in a planetary ball mill, the weight percentage of the mixture, balls and water is 1:2:0.8, and the mixing time is 2 hours. The ball-milled slurry is spray-dried and granulated, and passed through 40-mesh and 60-mesh sieves respectively to obtain composite powder particles with different particle sizes. The composite powder is mixed according to the weight ratio of coarse and fine particles in a size of 1:1, and added to a metal mold for dry pressing molding. The molding pressure is 40MPa. After demoulding, the sample is dried at 110°C until the moisture content is not greater than 1%. . The dried sample was fired at 1500°C for 1 hour ...

Embodiment 2

[0025] Embodiment 2: carry out batching with the mass percent that mullite content accounts for total mass as 40%

[0026] First, weigh 24% of raw materials α-alumina, 38% of pseudoboehmite, 23% of titanium dioxide, 10% of silicon micropowder, 2% of aluminum fluoride, and 3% of stabilizer according to the following proportions. Add it into a planetary ball mill for mixing, the weight percentage of the mixture, balls and water is 1:2.5:0.9, and the mixing time is 1 hour. The ball-milled slurry is spray-dried and granulated, passed through 40 mesh and 60 mesh sieves respectively to obtain composite powder particles with different particle sizes, and the composite powder is mixed according to the particle size and weight ratio of 40 mesh and 60 mesh particles at a weight ratio of 2:1. material, and added to a metal mold for dry pressing molding, the molding pressure is 40MPa, after demoulding, the sample is dried at 110°C until the moisture content is not more than 1%. The dried...

Embodiment 3

[0027] Embodiment 3: mullite content accounts for the mass percent of total mass as 20% and carries out batching

[0028]First, weigh 11% of raw materials α-alumina, 50% of pseudoboehmite, 29% of titanium dioxide, 5% of silicon micropowder, 2% of aluminum fluoride, and 3% of stabilizer according to the following proportions, wherein the above-mentioned raw material powders are added Mix in a planetary ball mill, the weight percentage of the mixture, balls and water is 1:1.5:0.8, and the mixing time is 0.5 hour. The ball-milled slurry is spray-dried and granulated, passed through 40 mesh and 60 mesh sieves respectively to obtain composite powder particles with different particle sizes, and the composite powder is mixed according to the particle size and weight ratio of 40 mesh and 60 mesh particles at a weight ratio of 2:1. Material, and added to the metal mold for dry pressing molding, the molding pressure is 80MPa, after demoulding, the sample is dried at 110°C until the mois...

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Abstract

The invention discloses an in-situ authigenic mullite whister reinforced aluminum titanate porous ceramic material and a preparation method thereof. The method comprises the following steps of: adding aluminum fluoride and a stabilizing agent for preventing aluminium titanate from being decomposed into alpha-alumina, pseudo boehmite, titanium dioxide and micro powder which serve as main raw materials, directly ball-milling and mixing powder raw materials by using a wet process, drying, granulating, and performing dry pressing for forming. The in-situ authigenic mullite whister reinforced aluminum titanate porous ceramic material is synthesized in situ directly by a one-step method; and according to the synthesized porous ceramic material, an authigenic mullite whister reinforced phase synthesized in situ is inserted into an aluminum titanate substrate material uniformly. Mullite whisters are synthesized in situ and inserted among gaps of the porous ceramic material uniformly, so an effect of reinforcing aluminum titanate porous ceramics is achieved well. The in-situ authigenic mullite whister reinforced aluminum titanate porous ceramic material lays a good foundation for applying the aluminum titanate porous ceramic material to the filtration of industrial high-temperature flue gas and the purification of tail gas of automotive vehicles.

Description

technical field [0001] The invention relates to the field of porous ceramic materials, in particular to an in-situ synthesized mullite whisker-reinforced aluminum titanate porous ceramic material and a preparation method thereof. Background technique [0002] With the development of the national economy and the acceleration of industrialization, the problem of environmental pollution has become prominent. A large number of industrial wastes, especially industrial high-temperature flue gas, motor vehicle exhaust, and solid particles have become the chief culprit of urban pollution. Therefore, carrying out the research and development of high-temperature flue gas filtration and catalytic technology to reduce the emission of solid particles and toxic gases has become an important part of energy-saving emission reduction and environmental protection projects. In addition to high temperature resistance and corrosion resistance, high temperature filter materials also need to have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 徐国纲崔洪芝阮国智张智慧曾荣昌
Owner SHANDONG UNIV OF SCI & TECH