Aluminum titanate ceramic articles and methods of making same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-035/478
C04B-035/462
B01D-039/20
출원번호
US-0064347
(2005-02-22)
등록번호
US-7259120
(2007-08-21)
발명자
/ 주소
Ellison,Adam James Gillmar
Tepesch,Patrick David
Warren,Christopher John
출원인 / 주소
Corning Incorporated
인용정보
피인용 횟수 :
19인용 특허 :
36
초록▼
An aluminum titanate ceramic article having a predominant crystal phase of aluminum titanate and a material composition including aluminum, titanium, silica, an alkaline earth metal (e.g., at least one selected from the group of strontium, calcium, barium, or combinations), and a rare earth metal (e
An aluminum titanate ceramic article having a predominant crystal phase of aluminum titanate and a material composition including aluminum, titanium, silica, an alkaline earth metal (e.g., at least one selected from the group of strontium, calcium, barium, or combinations), and a rare earth metal (e.g., at least one selected from the group consisting of yttrium, lanthanum, and combinations) and methods of making such aluminum titanate bodies are described. An oxide of yttrium metal or lanthanide metals is preferably used as a sintering aid in combination with the other compositional components to enable firing of the resulting green body at a lower heating temperature of less than 1500째 C., and more preferably between 1400째-1450째 C., with a preferable hold time of less than 8 hours, more preferably of 6 to 8 hours.
대표청구항▼
What is claimed: 1. An aluminum titanate ceramic article, comprising: a predominant crystal phase of aluminum titanate and a material composition including aluminum, titanium, silicon, an alkaline earth metal, and a rare earth metal oxide in an amount less than 0.5%, as expressed on a weight percen
What is claimed: 1. An aluminum titanate ceramic article, comprising: a predominant crystal phase of aluminum titanate and a material composition including aluminum, titanium, silicon, an alkaline earth metal, and a rare earth metal oxide in an amount less than 0.5%, as expressed on a weight percent oxide basis, wherein the alkaline earth metal is at least one selected from the group consisting of strontium, calcium, barium, and combinations thereof. 2. The aluminum titanate ceramic article of claim 1, wherein the rare earth metal oxide is at least one selected from the group consisting of yttrium oxide, lanthanum oxide, and combinations thereof. 3. The ceramic article of claim 2, wherein the composition further comprises, as expressed on a weight percent oxide basis, a (Al2O3.TiO2)+b (CaO.Al2O3.2SiO2)+c (SrO.Al2O3.2SiO2)+d (BaO.Al2O3.2SiO2)+e (3Al2O3.2SiO2)+f (Al2O3)+g (SiO2)+h (Fe2O3.TiO2)+i (La2O3)+j (La2O3.4TiO2.6Al2O3)+k (LaAlO3) where a, b, c, d, e, f, g, h, i, j and k are weight fractions of each component such that (a+b+c+d+e+f+g+h+i+j+k=1.000), and where 0.50.001 and b+c+d>0.001. 4. The ceramic article of claim 2, wherein the composition further comprises, as expressed on a weight percent oxide basis, a (Al2O3.TiO2)+b (CaO.Al2O3.2SiO2)+c (SrO.Al2O3.2SiO2)+d (BaO.Al2O3.2SiO2)+e (3Al2O3.2SiO2)+f (Al2O3)+g (SiO2)+h (Fe2O3.TiO2)+i (La2O3)+j (La2O3.TiO2.Al2O3)+k (LaAlO3) where a, b, c, d, e, f, g, h, i, j and k are weight fractions of each component such that (a+b+c+d+e+f+g+h+i+j+k=1.00), and where 0.50.001 and b+c+d>0.01. 5. The ceramic article of claim 2, wherein the composition further comprises, as expressed on a weight percent oxide basis: 40-65% Al2O3; 25-40% TiO2; 3-12% SiO2; 2-10% of at least one alkaline earth oxide selected from the group consisting of SrO, CaO, BaO, and combinations thereof; and 0.01-0.5% of at least one rare earth oxide selected from the group consisting of La2O3, Y2O3, and combinations thereof. 6. The ceramic article of claim 5, further comprising Fe2O3 of between 0.01 and 0.35%, expressed on a weight percent oxide basis. 7. The ceramic article of claim 5, comprising La2O3 in an amount less than 0.5% calculated on a weight percent oxide basis. 8. The ceramic article of claim 2, consisting essentially of: an oxide composition, calculated on a weight percent oxide basis, of 45-60% Al2O3; 28-36% TiO2; 5-12% SiO2; 3-8% SrO; 0.1 to 5% CaO; and an amount less than 0.5% La2O3. 9. The ceramic article of claim 1, comprising a porosity of greater than 40% by volume. 10. The ceramic article of claim 1, comprising a median pore size of greater than 10 μm. 11. The ceramic article of claim 1, comprising a coefficient of thermal expansion as measured between RT-1000째 C. of 15횞10-7/째 C. or less. 12. The ceramic article of claim 1, comprising a coefficient of thermal expansion as measured between RT-1000째 C. of 10횞10-7/째 C. or less and a porosity of greater than 40% by volume. 13. A diesel particulate filter including the ceramic article of claim 1, said filter having a plurality of axially extending end-plugged inlet and outlet cells. 14. A system comprising the diesel particulate filter of claim 13, said system including an engine and a pipe interconnecting the engine to the diesel particulate filter. 15. An aluminum titanate ceramic article, comprising: a predominant crystal phase of aluminum titanate and a minor phase of an alkaline earth metal feldspar comprised of at least one element selected from the group of strontium, calcium, barium, and combinations thereof, and a material composition including aluminum, titanium, and silicon, and a rare earth metal oxide in an amount less than 0.5%, as expressed on a weight percent oxide basis. 16. An aluminum titanate ceramic article of claim 15 wherein the rare earth metal oxide is selected from the group consisting of yttrium oxide, lanthanum oxide, and combinations thereof. 17. An aluminum titanate ceramic article of claim 15 further comprising a minor phase of alumina. 18. The aluminum titanate ceramic article of claim 2, wherein the composition comprises strontium oxide, calcium oxide, and lanthanum oxide. 19. The aluminum titanate ceramic article of claim 18, wherein the composition comprises less than 0.35% iron oxide, as expressed on a weight percent oxide basis. 20. The aluminum titanate ceramic article of claim 19, wherein the composition is magnesium free. 21. The aluminum titanate ceramic article of claim 16, wherein the composition comprises strontium oxide, calcium oxide, and lanthanum oxide. 22. The aluminum titanate ceramic article of claim 21, wherein the composition comprises less than 0.35% iron oxide, as expressed on a weight percent oxide basis. 23. The aluminum titanate ceramic article of claim 21, wherein the composition is magnesium free.
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