A ceramic article which consists essentially, by weight on the oxide basis, of 10-25% SiO2,65-85% Al2O3,and 2-12% Li2O and comprises beta-eucryptite as a first phase having a negative component in thermal expansion and a melting point Tm1,and a second phase having a positive component in thermal exp
A ceramic article which consists essentially, by weight on the oxide basis, of 10-25% SiO2,65-85% Al2O3,and 2-12% Li2O and comprises beta-eucryptite as a first phase having a negative component in thermal expansion and a melting point Tm1,and a second phase having a positive component in thermal expansion which is higher than the component in thermal expansion of the first phase and a melting point Tm2,wherein Tm2>Tm1,wherein the first phase is at most 50% by weight of the ceramic, and wherein the ceramic is characterized by microcracking. Tm2is at least 1800° C. The ceramic article exhibits a near zero coefficient of thermal expansion from room temperature to 800° C., a high refractoriness, and a high resistance to thermal shock properties which make the inventive ceramic extremely desirable in high temperature applications, such as filters for diesel exhaust engines.
대표청구항▼
A ceramic article which consists essentially, by weight on the oxide basis, of 10-25% SiO2,65-85% Al2O3,and 2-12% Li2O and comprises beta-eucryptite as a first phase having a negative component in thermal expansion and a melting point Tm1,and a second phase having a positive component in thermal exp
A ceramic article which consists essentially, by weight on the oxide basis, of 10-25% SiO2,65-85% Al2O3,and 2-12% Li2O and comprises beta-eucryptite as a first phase having a negative component in thermal expansion and a melting point Tm1,and a second phase having a positive component in thermal expansion which is higher than the component in thermal expansion of the first phase and a melting point Tm2,wherein Tm2>Tm1,wherein the first phase is at most 50% by weight of the ceramic, and wherein the ceramic is characterized by microcracking. Tm2is at least 1800° C. The ceramic article exhibits a near zero coefficient of thermal expansion from room temperature to 800° C., a high refractoriness, and a high resistance to thermal shock properties which make the inventive ceramic extremely desirable in high temperature applications, such as filters for diesel exhaust engines. y, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkylthio, C1-C4-haloalkylthio, C1-C4-alkoxy, C1-C4-haloalkoxy; Het is a three- to six-membered partially or fully saturated heterocyclic group or a three- to six-membered heteroaromatic group having up to three hetero atoms selected from the group consisting of: nitrogen, oxygen or sulfur, where the abovementioned heterocyclic or heteroaromatic group may be partially or fully halogenated and/or may be substituted by R5; R5is hydrogen, hydroxyl, mercapto, amino, cyano, nitro, formyl, C1-C4-alkylamino, C1-C4-dialkylamino, C1-C4-alkoxycarbonyl, C1-C4-alkylcarbonyl, C1-C4-alkylcarbonyloxy, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkylthio,
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (4)
Swartz Scott L., Ceramics having negative coefficient of thermal expansion, method of making such ceramics, and parts made from such ceramics.
Zuberi, Bilal; Pillai, Sunilkumar C.; Lachenauer, Robert G.; Dutta, Biprodas; Carty, William M., Extruded porous substrate and products using the same.
Torrecillas San Millán, Ramón; Fernández Valdés, Adolfo; García Moreno, Olga, Lithium aluminosilicate-based materials with negative thermal expansion coefficient in a broad temperature range preparation process and use.
Hogan, John P.; Dennis, Timothy Alan; Petrmichl, Rudolph Hugo; Kemenah, Greg, Vacuum insulating glass (VIG) unit with lead-free dual-frit edge seals and/or methods of making the same.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.