Corning Incorporated

Lisa Marie Noni

Charlene Marie Smith

Rostislav Vatchev Roussev

Ljerka Ukrainczyk

Ryan Claude Andrews

Shelby Kerin Wilson

Albert Joseph Fahey

Kevin Barry Reiman

Benedict Osobomen Egboiyi

Sujanto Widjaja

Zhiqiang Shi

John David Helfinstine

Prakash Chandra Panda

David John Worthey

Robert Arthur McIntosh

Kameron Isaiah Chambliss

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&#x221a;m or more as measured according to the double cantilever beam method.

Chemically strengthened lithium disilicate-petalite glass-ceramics

Test apparatus and methods for impact testing specimens, including edge impact testing are disclosed. The apparatus and methods disclosed include a pendulum and a bob which are used to impact test specimens against an impacting object.

Impact testing apparatus and methods

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 0.07 t to a depth of about 0.26 t 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 0.18 t to about 0.25 t 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&#x221a;m or more as measured according to the double cantilever beam method.

Systems () and methods for measuring and displaying a visual and/or graphical representation of the specific modulus (E/&#x3c1;) of a cellular ceramic body (), such as those used to form particulate filters, are disclosed. The ultrasonic measurement system employs an ultrasonic transmitter (T) and an ultrasonic receiver (R) adjacent to, but spaced apart from respective ends () of the ceramic body. Multiple ultrasonic waves () are sent through corresponding multiple longitudinal portions (P) of the honeycomb structure (), where adjacent longitudinal portions overlap. Time of flight (TOF) measurements (TOF, TOF), along with other parameters describing the ceramic body, allow for the measurement of the sonic speed (c) of the ultrasonic waves that pass through the ceramic body as well as the attenuation (IR). The specific modulus is then calculated from the square of the sonic speed (C). The high resolution of the ultrasonic measurements allows for improved evaluation of the manufacturing process.

Systems and methods for measuring the specific modulus of cellular ceramic bodies

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Horseheads, NY, United States of America

Lisa Marie Noni