Abstract:
A glass that is ion exchangeable to a depth of at least 20 μm (microns) and has a internal region having a tension of less than or equal to 100 MPa. The glass is quenched or fast cooled from a first temperature above the anneal point of the glass to a second temperature that is below the strain point of the glass. In one embodiment, the glass is a silicate glass, such as an alkali silicate glass, an alkali aluminosilicate glass, an aluminosilicate glass, a borosilicate glass, an alkali aluminogermanate glass, an alkali germanate glass, an alkali gallogermanate glass, and combinations thereof.
Abstract:
Methods are provided for reducing the dimensional changes of a glass substrate during a display manufacturing process. The reductions are achieved by increasing the fast relaxation exhibited by the glass. Test methods are provided for distinguishing the effects on dimensional changes of fast relaxation versus slow relaxation. Glass substrates which exhibit reduced dimensional changes during critical thermal cycles of display manufacturing processes are also disclosed.
Abstract:
A glass that is down-drawable and ion exchangeable. The glass has a temperature T35kp which the viscosity is 35 kilopoise. T35kp less than the breakdown temperature Tbreakdown of zircon.
Abstract:
A strengthened glass that does not exhibit frangible behavior when subjected to impact or contact forces, and a method of strengthening a glass. The glass may be strengthened by subjecting it to multiple, successive, ion exchange treatments. The multiple ion exchange treatments provide a local compressive stress maximum at a depth of the strengthened layer and a second local maximum at or near (e.g., within 10 μm) the surface of the glass.
Abstract:
An alkali aluminosilicate glass that is chemically strengthened and has a down-drawable composition. The glass has a melting temperature less than about 1650° C. and a liquidus viscosity of at least 130 kpoise and, in one embodiment, greater than 250 kpoise. The glass undergoes ion exchange at relatively low temperatures to a depth of at least 30 μm.
Abstract:
A silicate glass that is tough and scratch resistant. The toughness is increased by minimizing the number of non-bridging oxygen atoms in the glass. In one embodiment, the silicate glass is an aluminoborosilicate glass in which −15 mol %≦(R2O+R′O—Al2O3—ZrO2)—B2O3≦4 mol %, where R is one of Li, Na, K, Rb, and Cs, and R′ is one of Mg, Ca, Sr, and Ba.
Abstract:
Described herein are alkali-free, boroalumino silicate glasses exhibiting desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs). In accordance with certain of its aspects, the glasses possess good dimensional stability as a function of temperature.
Abstract:
A process for making glass sheet with low compaction suitable for high temperature applications, such as low-temperature polysilicon-based TFT displays, and glass sheets thus made. The glass sheet desirably has an anneal point of at least 765° C., a CTE at most 42×10−7/° C. The process involves cooling the glass melt form a temperature corresponding to a viscosity of 1.0×1010 poise to a temperature corresponding to a viscosity of 1.0×1015 poise at a cooling rate CR, where CR≧5° C./second. The absolute value of the measured compaction of the glass sheet desirably is at most 175 ppm upon being re-heated to 675° C. for a period of time.