Cordierite aluminum magnesium titanate compositions and ceramic articles comprising same

Abstract

Disclosed are ceramic bodies comprised of composite cordierite aluminum magnesium titanate ceramic compositions and methods for the manufacture of same.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of, and claims priority to, U.S. Patent Application Serial No. 13 / 676,567, filed November 14, 2012, which is a continuation-in-part of U.S. Patent Application Serial No. 13 / 584,993, filed August 14, 2012 application, the entire contents of the above two articles are incorporated herein by reference as if fully set forth herein. field of invention [0003] The present invention relates to ceramic compositions, and more particularly, to composite ceramic compositions comprising cordierite aluminum magnesium titanate. technical background [0004] Refractory materials with low thermal expansion and thus high thermal shock resistance are used in applications such as catalytic converter substrates and diesel particulate filters that generate high thermal gradients during use. One of the best materials for these applications is cordierite because of its low thermal expansion, high ...

AI Technical Summary

Problems solved by technology

Second, the thermal expansion of AT is relatively low only at larger particle sizes, and microcracks form on cooling in the kiln

These large particles and microcracks tend to make the mechanical strength of the material lower

Third, microcracks cause thermal expansion curves with large hysteresis, resulting in very high instantaneous thermal expansion values, especially when cooling

However, cordierite and pure aluminum titanate cannot reach thermodynamic equilibrium at any temperature

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