Acid resistant ceramic materials, filter using the same, and preparation of them

一种耐碱性、多孔陶瓷的技术，应用在陶瓷材料领域，能够解决总体结构强度减弱等问题

Inactive Publication Date: 2008-03-05
KH CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because, although the oxides of each component are crystallized or synthesized at a temperature higher than its melting point to form materials such as composite oxides, the inherent chemical characteristics of each oxide are not lost, and as a result, The strength of the overall structure of the composite structure may be weakened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] With 3Al 2 o 3 -2SiO2 2 -3TiO 2 Composite ceramic structures with compositional ratios were fabricated. The starting material is alumina (Al 2 o 3 ), silicon dioxide (SiO 2 ) and titanium dioxide (TiO 2 ). The starting materials were weighed, then introduced into a mixer and mixed for 30 minutes or more, using acetone as a mixing solution. The mixed powder thus prepared is handled in the form of a disk. The resulting blank was heat treated at 1500°C for 2 hours. In XRD (X-ray scattering) analysis, the structure of mullite (3Al 2 o 3 -2SiO2 2 ) and crystal structure (TiO 2 -Al 2 o 3 ) has been observed. 3Al synthesized as above 2 o 3 -2SiO2 2 -3TiO 2 The composite ceramic structure shows 6.2x10 -6 / K coefficient of thermal expansion.

Embodiment 2

[0058] with 2Al 2 o 3 -TiO 2 -ZrO 2 Composite ceramic structures with compositional ratios were fabricated. The starting material is alumina (Al 2 o 3 ), zirconium dioxide (ZrO 2 ) and titanium dioxide (TiO 2 ). The starting materials were weighed, then introduced into a mixer and mixed for 30 minutes or more, using acetone as a mixing solution. The mixed powder thus produced is processed in the form of a green body. The resulting blank was heat treated at 1450°C for 2 hours. In XRD analysis, TiZrO 4 structure and Al 2 TiO 5 The crystal structure was observed. 2Al synthesized as above 2 o 3 -TiO 2 -ZrO 2 The composite ceramic structure shows 7.1x10 -6 / K coefficient of thermal expansion.

Embodiment 3

[0060] with WO 3 -3TiO 2 -3ZrO 2 Composite ceramic structures with compositional ratios were fabricated. The starting material is tungsten oxide (WO 3 ), zirconium dioxide (ZrO 2 ) and titanium dioxide (TiO 2 ). The starting materials were weighed, then introduced into a mixer and mixed for 30 minutes or more, using acetone as a mixing solution. The mixed powder thus produced is processed in the form of a green body. The resulting blank was heat-treated at 1100°C for 2 hours. In XRD analysis, TiZrO 4 structure was observed. WO synthesized as above 3 -3TiO 2 -3ZrO 2 The composite ceramic structure shows 7.5x10 -6 / K coefficient of thermal expansion.

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PUM

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Abstract

Abstract The present invention provides porous ceramic materials having good resistance to heat, acid and base, comprising three or more oxides selected from an oxide of silicon (SiO ), an oxide of aluminum (Al O ), an oxide of a transition metal, MxOy, [wherein M represents a 4B, 5B or 6B-group transition metal which can be selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W or Ce, x represents an integer of 1 to 3, and y represents an integer of 1 to 3] and its preparation. By applying ceramic materials prepared according to the present invention that are structurally, thermally and chemically stable to a porous honeycomb support for the purification of exhaust gas or to a filter (DPF, Diesel Particulate Filter) for the purification of diesel engine exhaust gas, it is possible to prevent or remarkably reduce any structural destruction caused by corrosive gas, which results from employing a cordierite material as a structural support.

Description

technical field [0001] The present invention relates to a ceramic material having excellent heat resistance, acid resistance and alkali resistance, a filter using the ceramic material, and a method for preparing them. [0002] As catalyst supports or filter systems for operation at high temperatures (e.g. supports for catalysts for purifying automobile exhaust gases, heat exchangers for gas turbines, filter systems for purifying diesel automobile exhaust gases (DPF, diesel particulate filter) or similar), mullite (which has 2SiO 2 -3Al 2 o 3 composition) and cordierite (which has 2MgO-2Al 2 o 3 -5SiO 2 Composition) because of its superior thermal properties (such as low thermal expansion coefficient (1 ~ 5x10 -6 / K), thermal conductivity, dielectric constant or similar) and their chemical stability characteristics are widely used. [0003] However, there are some problems: mullite is rarely found in nature, so it is only obtained through synthetic routes; and, because o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01
CPCC04B2235/3418C04B2235/3239C04B35/478C04B35/185C04B2235/9692C04B2111/23C04B38/0006B01D39/2093C04B2235/3232C04B2235/3229C04B2235/3217C04B2111/0081C04B2235/3463C04B2235/80C04B2235/3251C04B2235/9607C04B2235/96C04B35/62685C04B2235/3258C04B2235/3241C04B35/49C04B35/6262C04B2235/3256C04B2235/3244Y10T428/24149C04B35/01C04B35/10C04B35/14
Inventor 金永南
Owner KH CHEM CO LTD
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