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Strontium feldspar aluminum titanate for high temperature applications

A technology of aluminum titanate and strontium feldspar, applied in the field of strontium feldspar aluminum titanate ceramics, can solve the problems of poor thermal shock resistance, high thermal expansion coefficient and high cost of SiC

Inactive Publication Date: 2005-07-20
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiC is costly and must be segmented due to its inherent high coefficient of thermal expansion (CTE) and poor thermal shock resistance

Method used

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  • Strontium feldspar aluminum titanate for high temperature applications
  • Strontium feldspar aluminum titanate for high temperature applications
  • Strontium feldspar aluminum titanate for high temperature applications

Examples

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Embodiment

[0030] In order to more fully illustrate the present invention, the following non-limiting examples of extruded honeycombs are listed in Tables I and II. Table I records the compositions of the examples of the invention and the resulting combinations. Table II reports the measured physical properties of samples of the invention. All parts, ratios and percentages are by weight of the total material unless otherwise indicated.

[0031] The oleic acid and silica as a dispersant were mixed for about 10-15 minutes before the remaining dry materials and organic components were added. The resulting mixture was continuously mixed and homogenized. Sufficient deionized water was then gradually added to the grinder to render the mixture plastic. After kneading, the mixed ingredients are extruded through a die to form a honeycomb body having 100-200 cells per square inch and a wall thickness of about 0.010-0.025 inches. The honeycomb thus formed was cut to the desired length and heate...

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Abstract

A structure for use in high temperature applications and including a porous ceramic material consisting essentially of about 50-90 percent by weight iron or magnesium stabilized aluminum titanate (AlTiO5) and about 10-50 percent by weight strontium feldspar (SrO.Al2O3.2SiO2), and having a coefficient of thermal expansion over a temperature range from room temperature to 1000° C. of about -10x10-7 / ° C. to +15x10-7 / ° C., a heat capacity at 500° C. greater than 3.2 J / cm3K, a porosity of about 15-50 percent by volume, preferably 40-50 percent by volume, and a median pore size of about 5-50 micrometers, preferably 8-15 micrometers. The structure is especially useful as a diesel exhaust particulate filter.

Description

Background of the invention [0001] The present invention relates to strontium feldspar aluminum titanate ceramics. In particular, the present invention relates to strontium feldspar aluminum titanate ceramics with low thermal expansion, high thermal shock resistance, suitable porosity and narrow pore size distribution for diesel engine exhaust filtration applications. [0002] In industry, cordierite (2MgO·2Al 2 o 3 ·5SiO2 2 ) is the cost-effective material of choice for high temperature filtration applications due to its combination of good thermal shock resistance, filtration efficiency, and durability under most operating conditions. However, in some cases, cordierite filters can be easily damaged and even cause catastrophic accidents. There is occasional thermal runaway during uncontrolled regeneration, leading to localized melting of the cordierite. Another contributor to failure occurs when metallic impurities from engine oil, catalytic additives, or dissolved metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20B01D46/24C04B35/46C04B35/478C04B35/636C04B38/00F01N3/022F01N3/28
CPCC04B2235/3418C04B2235/3206C04B35/478C04B38/0006C04B35/63C04B2235/3232C04B2235/3217Y02T10/20C04B2235/80C04B2111/00793C04B2235/72C04B2235/3213C04B2235/77F01N3/0222C04B2235/5292C04B35/632C04B2235/9607C04B2235/449C04B2235/3272C04B2235/3481C04B2235/5436C04B35/6365F01N3/2828Y10S55/30Y02T10/12C04B35/195C04B38/0054C04B38/0074C04B35/462
Inventor S·B·奥古米
Owner CORNING INC
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