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    Methods of characterizing ion-exchanged chemically strengthened glasses containing lithium
    41.
    发明授权
    Methods of characterizing ion-exchanged chemically strengthened glasses containing lithium 有权

    公开(公告)号：US11703500B2

    公开(公告)日：2023-07-18

    申请号：US17873495

    申请日：2022-07-26

    Applicant: CORNING INCORPORATED

    Inventor： Rostislav Vatchev Roussev ,  Vitor Marino Schneider

    IPC: G01N33/38 ,  C03C21/00 ,  G01L1/00

    CPC classification number: G01N33/386 ,  C03C21/002 ,  G01L1/00

    Abstract: Methods of characterizing ion-exchanged chemically strengthened Li-containing glasses include: a) measuring a mode spectrum of the glass sample; b) using the mode spectrum, estimating a first contribution to the center tension associated with a spike region and estimating a second contribution to the center tension due to a deep region only, wherein the deep region is assumed to follow a power-law stress profile; and c) determining a total center tension by adding of the first and second contributions to the center tension. The methods can be used for quality control during manufacturing of glass samples by comparing the total center tension to a center tension specification that provides optimum strength and durability.

    Chemically strengthened lithium disilicate-petalite glass-ceramics
    43.
    发明授权
    Chemically strengthened lithium disilicate-petalite glass-ceramics 有权

    公开(公告)号：US11634360B2

    公开(公告)日：2023-04-25

    申请号：US17461126

    申请日：2021-08-30

    Applicant: Corning Incorporated

    Inventor： Ryan Claude Andrews ,  Albert Joseph Fahey ,  Lisa Marie Noni ,  Rostislav Vatchev Roussev ,  Charlene Marie Smith ,  Ljerka Ukrainczyk ,  Shelby Kerin Wilson

    IPC: C03C21/00 ,  C03C10/00

    Abstract: Ion-exchanged glass ceramic articles described herein have a stress that decreases with increasing distance according to a substantially linear function from a depth of about 0.07t to a depth of about 0.26t from the outer surface of the ion-exchanged glass ceramic article from a compressive stress to a tensile stress. The stress transitions from the compressive stress to the tensile stress at a depth of from about 0.18t to about 0.25t from the outer surface of the ion-exchanged glass ceramic article. An absolute value of a maximum compressive stress at the outer surface of the ion-exchanged glass article is from 1.8 to 2.2 times an absolute value of a maximum central tension (CT) of the ion-exchanged glass article, and the glass ceramic article has a fracture toughness of 1 MPa√m or more as measured according to the double cantilever beam method.

    Glass-based articles including a metal oxide concentration gradient
    45.
    发明授权
    Glass-based articles including a metal oxide concentration gradient 有权

    公开(公告)号：US11453612B2

    公开(公告)日：2022-09-27

    申请号：US15491531

    申请日：2017-04-19

    Applicant: CORNING INCORPORATED

    Inventor： Rostislav Vatchev Roussev ,  Charlene Marie Smith

    IPC: C03C21/00 ,  C03C3/097 ,  C03C3/093 ,  H05K5/00 ,  H05K5/02

    Abstract: Provided are methods of forming a chemically strengthened glass-based article. Certain methods comprise: providing a glass-based substrate comprising a first surface and a second surface opposing the first surface defining a thickness (t), a length dimension, a width, and a weight; and ion exchanging a plurality of alkali ions into the glass-based substrate to form a non-zero alkali metal oxide concentration that varies along at least a substantial portion of the thickness (t). The ion exchanging comprises immersing a glass-based substrate in a molten salt bath comprising at least about 90% by weight KNO3, and less than about 10% by weight NaNO3 for a time in the range of 70% to 130% of the ion exchange time that produces a peak central tension (CT) with the same molten salt bath composition and temperature. Also provided are ion exchanged glass-based articles prepared by said methods.

    DEEP NON-FRANGIBLE STRESS PROFILES AND METHODS OF MAKING
    48.
    发明申请
    DEEP NON-FRANGIBLE STRESS PROFILES AND METHODS OF MAKING 有权

    公开(公告)号：US20210253473A1

    公开(公告)日：2021-08-19

    申请号：US17306191

    申请日：2021-05-03

    Applicant: CORNING INCORPORATED

    Inventor： PASCALE ORAM ,  Rostislav Vatchev Roussev ,  Vitor Marino Schneider ,  Emily Elizabeth Young

    IPC: C03C21/00 ,  C03C3/097

    Abstract: A non-frangible glass article strengthened by a dual or two-step ion exchange (IOX) process, where the first IOX step leads to a depth of compressive layer FSM_DOL>0.1·t or, in some embodiments, FSM_DOL>0.15·t, where t is the thickness of the glass, is provided. The glass article has a compressive stress CS1 after the first IOX step at the surface of from 100 MPa to 400 MPa or, in some embodiments, from 150 MPa to 300 MPa. The first IOX step is followed by a second IOX step, leading to a “spike” compressive stress CS2 after the second IOX step at the surface of greater than 500 MPa or, in some embodiments, 700 MPa. The width of the spike generated by the second IOX is between 1 μm and 30 μm, or between 8 μm and 15 μm, using the criteria where the magnitude (absolute value) of the slope of the spike is higher than 20 MPa/μm.

    Fusion-formable glass-based articles including a metal oxide concentration gradient
    50.
    发明授权
    Fusion-formable glass-based articles including a metal oxide concentration gradient 有权

    公开(公告)号：US10787387B2

    公开(公告)日：2020-09-29

    申请号：US15376057

    申请日：2016-12-12

    Applicant: Corning Incorporated

    Inventor： Timothy Michael Gross ,  Guangli Hu ,  Rostislav Vatchev Roussev ,  Charlene Marie Smith ,  Zhongzhi Tang ,  Steven Alvin Tietje

    IPC: C03C21/00 ,  C03C23/00 ,  C03C3/093 ,  C03C3/097 ,  C03C4/18

    Abstract: A glass-based article including a first surface and a second surface opposing the first surface defining a thickness (t) of about 3 millimeters or less (e.g., about 1 millimeter or less), and a stress profile, wherein all points of the stress profile between a thickness range from about 0·t up to 0.3·t and from greater than about 0.7·t to t, comprise a tangent with a slope having an absolute value greater than about 0.1 MPa/micrometer. In some embodiments, the glass-based article includes a non-zero metal oxide concentration that varies along at least a portion of the thickness (e.g., 0·t to about 0.3·t) and a maximum central tension of less than about 71.5/√(t) (MPa). In some embodiments, the concentration of metal oxide or alkali metal oxide decreases from the first surface to a point between the first surface and the second surface and increases from the point to the second surface. The concentration of the metal oxide may be about 0.05 mol % or greater or about 0.5 mol % or greater throughout the thickness. Methods for forming such glass-based articles are also disclosed.

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