Corning Incorporated

Lionel Joel Mary Beunet

Charlene Marie Smith

Qiang Fu

Allan Mark Fredholm

Marie Jacqueline Monique Comte

Sophie Peschiera

Anne Paris

Glass-ceramics exhibiting a Vickers indentation crack initiation threshold of at least 15 kgf are disclosed. These glass-ceramics may be ion exchangeable or ion exchanged. The glass-ceramics include a crystalline and amorphous phases generated by subjecting a thin precursor glass article to ceramming cycle having an average cooling rate in the range from about 10° C./minute to about 25° C./minute. In one or more embodiments, the crystalline phase may comprise at least 20 wt % of the glass-ceramics. The glass-ceramics may include β-spodumene ss as the predominant crystalline phase and may exhibit an opacity≥about 85% over the wavelength range of 400-700 nm for an about 0.8 mm thickness and colors an observer angle of 10° and a CIE illuminant F02 determined with specular reflectance included of a* between −3 and +3, b* between −6 and +6, and L* between 88 and 97.

Crack-resistant glass-ceramic articles and methods for making the same

Glass-ceramics exhibiting a Vickers indentation crack initiation threshold of at least 15 kgf are disclosed. These glass-ceramics may be ion exchangeable or ion exchanged. The glass-ceramics include a crystalline and amorphous phases generated by subjecting a thin precursor glass article to ceramming cycle having an average cooling rate in the range from about 10&#xb0; C./minute to about 25&#xb0; C./minute. In one or more embodiments, the crystalline phase may comprise at least 20 wt % of the glass-ceramics. The glass-ceramics may include &#x3b2;-spodumene ss as the predominant crystalline phase and may exhibit an opacity &#x2265;about 85% over the wavelength range of 400-700 nm for an about 0.8 mm thickness and colors an observer angle of 10&#xb0; and a CIE illuminant F02 determined with specular reflectance included of a* between &#x2212;3 and +3, b* between &#x2212;6 and +6, and L* between 88 and 97.

Glass-ceramics exhibiting a Vickers indentation crack initiation threshold of at least 15 kgf are disclosed. These glass-ceramics may be ion exchangeable or ion exchanged. The glass-ceramics include a crystalline and amorphous phases generated by subjecting a thin precursor glass article to ceramming cycle having an average cooling rate in the range from about 10&#xb0; C./minute to about 25&#xb0; C./minute. In one or more embodiments, the crystalline phase may comprise at least 20 wt % of the glass-ceramics. The glass-ceramics may include &#x3b2;-spodumene ss as the predominant crystalline phase and may exhibit an opacity &#x2267;about 85% over the wavelength range of 400-700 nm for an about 0.8 mm thickness and colors an observer angle of 10&#xb0; and a CIE illuminant F02 determined with specular reflectance included of a* between &#x2212;3 and +3, b* between &#x2212;6 and +6, and L* between 88 and 97.

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Montigny Loing, France

Lionel Joel Mary Beunet