A plate-like chemically strengthened glass having a compression stress layer on the surface of the glass, wherein the compressive stress value (CS.sub.0) at the glass surface of is 500 MPa or more, the plate thickness (t) is 400 .Math.m or more, the compressive stress depth of layer (DOL) is (t × 0.15) .Math.m or more, the compressive stress values (CS.sub.1) and (CS.sub.2) when the depth from the glass surface is ¼ and ½, respectively, are 50 MPa or more, m.sub.1 expressed by {m.sub.1 = (CS.sub.1 - CS.sub.2/(DOL/4 - DOL/2)} is -1.5 MPa/.Math.m or more, m.sub.2 expressed by {m.sub.2 = (CS.sub.2/(DOL/2 - DOL)} is 0 MPa/.Math.m or less, and m.sub.2 is less than m.sub.1.

Glass-based articles are provided that exhibit improved fracture resistance. The relationships between properties attributable to the glass composition and stress profile of the glass-based articles are provided that indicate improved fracture resistance.

Glass-based articles that include a hydrogen-containing layer extending from the surface of the article to a depth of layer. The hydrogen-containing layer includes a hydrogen concentration that decreases from a maximum hydrogen concentration to the depth of layer. The glass-based articles exhibit a high Vickers indentation cracking threshold. Glass compositions that are selected to promote the formation of the hydrogen-containing layer and methods of forming the glass-based article are also provided.

Methods for chemically strengthening a cover for an electronic are disclosed. The methods include removing material from a mounting surface of the cover to counteract warping of the mounting surface due to ion exchange. The chemically strengthened covers have a high bend strength and allow a strong seal to be formed between the cover and an enclosure component.

Embodiments disclosed therein generally pertain to selectively strengthening glass. More particularly, techniques are described for selectively strengthening cover glass, which tends to be thin, for electronic devices, namely, portable electronic devices.

The invention relates to glass articles suitable for use as electronic device housing/cover glass which comprise a glass ceramic material. Particularly, a cover glass comprising an ion-exchanged glass ceramic exhibiting the following attributes (1) optical transparency, as defined by greater than 90% transmission at 400-750 nm; (2) a fracture toughness of greater than 0.6 MPa.Math.m.sup.1/2; (3) a 4-point bend strength of greater than 350 MPa; (4) a Vickers hardness of at least 450 kgf/mm.sup.2 and a Vickers median/radial crack initiation threshold of at least 5 kgf; (5) a Young's Modulus ranging between about 50 to 100 GPa; (6) a thermal conductivity of less than 2.0 W/m° C., and (7) and at least one of the following attributes: (i) a compressive surface layer having a depth of layer (DOL) greater and a compressive stress greater than 400 MPa, or, (ii) a central tension of more than 20 MPa.

Glass articles and methods for producing glass articles for a portable electronic device are disclosed. Properties of the glass articles, such as cover members, are improved through chemical strengthening, thermoforming, or a combination thereof. The glass articles may include barrier layers to prevent diffusion of ions between glass layers of the glass article, internal compressive stress regions, or a combination thereof.

Asymmetrically strengthened glass articles, methods for producing the same, and use of the articles in portable electronic device is disclosed. The asymmetrically strengthened glass articles include glass articles having a deeper compressive stress layer in a thicker portion of the glass article. Using a budgeted amount of compressive stress and tensile stress, asymmetric chemical strengthening is optimized for the utility of a glass article. In some aspects, the strengthened glass article can be designed for reduced damage, or damage propagation, when dropped.

Provided in the present invention is a rare earth-doped reinforced glass-ceramic, and a preparation method and a use therefor. Raw materials rare earth-doped reinforced glass-ceramic comprise at least one of the following rare earth oxides: Ta.sub.2O.sub.5, La.sub.2O.sub.3, Y.sub.2O.sub.3, Tm.sub.2O.sub.3, or Nb.sub.2O.sub.5. In the present invention, a glass article doped with at least one rare earth oxide from among Ta.sub.2O.sub.5, La.sub.2O.sub.3, Y.sub.2O.sub.3, Tm.sub.2O.sub.3, or Nb.sub.2O.sub.5 is subjected to thermal treatment and ion exchange to produce the rare-earth doped reinforced glass-ceramic. In the rare earth-doped reinforced glass-ceramic, due to the high field strength and high accumulation effects of the rear earth element, the crystal size of the glass-ceramic is caused to low, and the crystal ratio thereof to be high, thus being able to effectively improve the mechanical performance and visible light transmittance of the glass-ceramic, and effectively controlling uniform devitrification of the glass. The invention is suitable for use in cover panels of electronic devices.

A method for producing a glass article is provided. The method for producing a glass article, the method including preparing a glass to be processed, the glass comprising a glass bulk and a low-refractive surface layer disposed on the glass bulk, and etching away the low-refractive surface layer to form an etched glass, wherein the etching away the low-refractive surface layer comprises: cleaning the low-refractive surface layer with an acid solution; and cleaning the low-refractive surface layer with a base solution after the cleaning it with the acid solution.