According to one embodiment, a glass article may include SiO.sub.2, Al.sub.2O.sub.3, Li.sub.2O and Na.sub.2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10.sup.−6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 μm after ion exchange in a salt bath comprising KNO.sub.3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

A strengthened cover glass or glass-ceramic sheet or article as well as processes and systems for making the strengthened glass or glass-ceramic sheet or article is provided for use in consumer electronic devices. The process comprises cooling the cover glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened cover glass sheets for use in or on consumer electronic products.

According to one embodiment, a glass composition may include from 65 mol. % to about 75 mol. % SiO.sub.2; from about 6 mol. % to about 12.5 mol. % Al.sub.2O.sub.3; from about 5 mol. % to about 12 mol. % alkali oxide; and from about 2 mol. % to about 7 mol. % CaO. The glass composition may be free from boron and BaO. The glass composition may be susceptible to strengthening by ion-exchange.

Embodiments of this disclosure pertain to articles that exhibit scratch-resistance and improved optical properties. In some examples, the article exhibits a color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 0 degrees to about 60 degrees from normal under an illuminant. In one or more embodiments, the articles include a substrate, and an optical film disposed on the substrate. The optical film includes a scratch-resistant layer and an optical interference layer. The optical interference layer may include one or more sub-layers that exhibit different refractive indices. In one example, the optical interference layer includes a first low refractive index sub-layer and a second a second high refractive index sub-layer. In some instances, the optical interference layer may include a third sub-layer.

According to one embodiment, a glass article may include SiO.sub.2, Al.sub.2O.sub.3, Li.sub.2O and Na.sub.2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10.sup.−6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 μm after ion exchange in a salt bath comprising KNO.sub.3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

Alkali aluminosilicate glasses that are resistant to damage due to sharp impact and capable of fast ion exchange are provided. The glasses comprise at least 4 mol % P.sub.2O.sub.5 and, when ion exchanged, have a Vickers indentation crack initiation load of at least about 7 kgf.

A method for generating various stress profiles for chemically strengthened glass. An alkali aluminosilicate glass is brought into contact with an ion exchange media such as, for example, a molten salt bath containing an alkali metal cation that is larger than an alkali metal cation in the glass. The ion exchange is carried out at temperatures greater than about 420° C. and at least about 30° C. below the anneal point of the glass.

A glass composition includes SiO.sub.2, Al.sub.2O.sub.3, B.sub.2O.sub.3, alkali metal oxides, alkaline earth oxides, TiO.sub.2, CeO.sub.2, Fe.sub.2O.sub.3, and is provides a yellow-colored glass article.

An ion exchangeable glass having a high degree of resistance to damage caused by abrasion, scratching, indentation, and the like. The glass comprises alumina, B.sub.2O.sub.3, and alkali metal oxides, and contains boron cations having three-fold coordination. The glass, when ion exchanged, has a Vickers crack initiation threshold of at least 10 kilogram force (kgf).

Ion exchangeable glasses containing SiO.sub.2, Al.sub.2O.sub.3, Na.sub.2O, MgO, B.sub.2O.sub.3, and P.sub.2O.sub.5 are provided. The compressive stresses of these ion exchanged glasses are greater than 900 megapascals (MPa) at a depth of 45 or 50 microns (μm) with some glasses exhibiting a compressive stress of at least 1 gigaPascals (GPa). The ion exchange rates of these glasses are much faster than those of other alkali aluminosilicate glasses and the ion exchanged glass is resistant damage to impact damage. A method of ion exchanging the glass is also provided.