Cordierite aluminum magnesium titanate compositions and ceramic articles comprising same

Patent metadata

Field	Value
Publication number	US-10526249-B2
Application number	US-201514722560-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	Nov 30, 2012
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

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

First claim

The invention claimed is:

1. A ceramic article, comprising:
a pseudobrookite phase comprising predominately alumina, magnesia, and titania;
a second phase comprising cordierite; and
a sintering aid, comprising:
(i) at least one of a calcium oxide and strontium oxide, and
(ii) at least one of a yttrium oxide, a lanthanum oxide, and a cerium oxide;

wherein the ceramic article comprises a total porosity of at least 40% by volume, a median pore size d 50 in a range of 10 μm to 30 μm, and a composition expressed on an oxide basis of a(Al 2 TiO 5 )+b(MgTi 2 O 5 )+c(2MgO.2Al 2 O 3 .5SiO 2 )+d(3Al 2 O 3 .2SiO 2 )+e(MgO.Al 2 O 3 )+f(2MgO.TiO 2 )+g(CaO)+h(SrO)+i(X)+j(Fe 2 O 3 .TiO 2 )+k(TiO 2 )+1(Al 2 O 3 ), wherein X is at least one of CeO 2 , Y 2 O 3 , and La 2 O 3 , and a, b, c, d, e, f, g, h, i, j, k, and l are weight fractions of each component such that (a+b+c+d+e+f+g+h+i+j+k+1)=1.00, and wherein 0.3≤a≤0.75, 0.075≤b≤0.3, 0.02≤c≤0.5, 0.0≤d≤0.4, 0.0≤e≤0.25, 0.0≤f≤0.1, 0.0≤g≤0.01, 0.0≤h≤0.02, 0.0015≤(g+h), 0.0≤i≤0.05, 0.0≤j≤0.03, 0.0 k 0.2, and 0.0≤1≤0.1.

2. The ceramic article of claim 1 , wherein the sintering aid comprises a cerium oxide.

3. The ceramic article of claim 1 , wherein the sintering aid comprises cerium oxide and at least one of yttrium oxide and a lanthanum oxide.

4. The ceramic article of claim 1 , wherein the ceramic article has a composition comprising, as expressed in weight percent on an oxide basis, from 4 to 10% MgO; from 40 to 55% Al 2 O 3 ; from 25 to 44% TiO 2 ; and from 5 to 25% SiO 2 .

Assignees

• Corning Inc

Inventors

• Divens-Dutcher Adriane Marie
• Tepesch Patrick David
• Vileno Elizabeth Marie

Classifications

• C04B2235/661

  Multi-step sintering · CPC title

• C04B2235/6567

  Treatment time · CPC title

• C04B2235/6021

  Extrusion moulding · CPC title

• C04B38/00

  Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536}) · CPC title

• C04B2235/9615

  Linear firing shrinkage · CPC title