|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||501/009 ; 650/337 ; 264/631|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 23 인용 특허 : 13|
A crystalline glass-ceramic article composed of a cordierite phase of cordierite crystals or aggregates of near-parallel crystallites, having a formula of either Mg.sub.2 Al.sub.4 Si.sub.5 O.sub.18 or A.sub.x B.sub.y Mg.sub.2 Al.sub.4+x+2y Si.sub.5-x-2y O.sub.18. With the first formula, the average size of the cordierite crystals or aggregates is less than 70 micrometers, and the mean coefficient of thermal expansion from 22.degree. C. to 800.degree. C. (CTE) is less than 9.times.10.sup.-7 /.degree. C. With the second formula, A is either sodium or potas...
[ What is claimed is:] [1.]1. A method of making a glass ceramic article, the method comprising:a) providing a glass having a glass compositional formula expressed in terms of moles of oxides selected from the group consisting of a first glass compositional formula of 2MgO+2Al.sub.2 O.sub.3 +5SiO.sub.2 and a second glass compositional formula of (x/2)A.sub.2 O+yBO+2MgO+Al.sub.2 O.sub.3 +(5-x-2y)SiO.sub.2, wherein, when the glass is of the second formula,A is selected from the group consisting of sodium and potassium,B is selected from the group consistin...