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High static fatigue alumina isospipes

A technology of alumina and isobaric tubes, applied in glass forming, glass forming, manufacturing tools, etc., can solve problems such as isobaric tube breakage, unqualified LCD panels, and endangering melting equipment

Active Publication Date: 2012-05-09
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondary crystals mixed into the drawn glass become a visible defect, and the final LCD panel containing this defect is rejected
The flaw could theoretically cause the isopipe to break, endangering the portion of the melting plant beneath the isopipe, as well as employees working near the machine

Method used

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  • High static fatigue alumina isospipes
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  • High static fatigue alumina isospipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Incompatibility of Zircon with High Alkali Glass

[0131] This example describes the incompatibility of the zircon material of the '786 patent with peralkali glass. The glass used in this experiment is of the type disclosed in reference to US patent application 12 / 542946, and has an alkali content of more than 10 wt%, specifically 13.75 wt.%, which is mainly Na 2 O and a small amount of K 2 O.

[0132] The glass was heated to 1214°C (viscosity = 35kp), and the zircon sample was rotated inside the molten glass at a superficial velocity of 0.32 cm / sec for 14 days. Figure 11 is a micrograph of the resulting zircon / glass interior surface. In this figure, 110 is glass, 112 is the body of the zircon sample, and 111 is the worm-like or fish-egg-like zirconia that was found to form on the surface of the zircon. The presence of this zirconia results in zirconia defects in the glass, making zircon materials incompatible for use with high alkali glasses.

Embodiment 2

[0134] Compatibility of A1148 with high alkali glass

[0135] This example describes the compatibility of A1148 alumina with high alkali glass. The zircon sample tested in Example 1 was replaced with an A1148 alumina sample and the experiment in Example 1 was repeated. The result is as Figure 12 As shown, among them, 121 is glass, 122 is A1148 alumina. It can be seen that the A1148 material is compatible with high alkali glasses, which did not show any apparent changes over the entire testing period.

Embodiment 3

[0137] Preparation of Alumina with High Static Fatigue Performance

[0138] This example describes the preparation of a high static fatigue alumina material suitable for making the main body of an isopipe (hereinafter referred to as "HSF alumina" for repeated reference).

[0139] The starting material for the preparation of HSF alumina was alumina plate obtained from Coors / Tek, Inc. (Golden, Colorado), sold under the designation AD-998. According to the manufacturer's report, the plates are said to contain 99.8 wt% Al 2 o 3 .

[0140] Figure 13 Shown is the SEM image of the initial grain size of the resulting AD-998. To increase the grain size, the panels were placed on high-purity alumina positioning sand in a high-purity clay box and annealed in air at 1700°C or 1750°C for 72 hours. The results of the annealing process are shown in Figure 14 and 15 ,in Figure 14 It is annealed at 1700℃, Figure 15 It is annealed at 1750°C. It can be seen that the grains of the a...

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PUM

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Abstract

Isopipes (13) for making a glass or a glass-ceramic using a fusion process are provided. The isopipes are made from an alumina material which has a higher static fatigue than existing alumina materials intended for use as isopipes. In particular, the alumina materials have times-to-failure (static fatigues) of greater than one hour at 1200 DEG C at an applied stress of 10,000 psi. These high levels of static fatigue allow alumina isopipes to replace zircon isopipes in the manufacture of high performance glass sheets by the fusion process, including glass sheets which are incompatible with zircon isopipes but compatible with alumina isopipes, e.g., chip and scratch resistant glass sheets which have high alkali contents.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application No. 61 / 363,445, filed July 12, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to isopipes used in the production of glass sheets by fusion processes, in particular to alumina isopipes exhibiting a high level of static fatigue performance. [0004] definition [0005] The phrase "static fatigue" refers to a delayed fracture phenomenon when an object is subjected to stress without breaking or failing immediately. Typically, static fatigue life can be as low as a few seconds or minutes or as long as tens of thousands of hours. [0006] The phrase "alumina material" means a material composed of one or more Al 2 o 3 Phase composition of refractories, Al in composition 2 o 3 The phase comprises at least 50 volume percent of the material. [0007] The term "isop...

Claims

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Application Information

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IPC IPC(8): C03B17/06C04B35/66
CPCC03B17/064C04B35/10C03B17/02C03B17/06C04B35/14C04B35/50C04B35/657
Inventor T·D·凯查姆J·J·麦克英托什朴垠泳
Owner CORNING INC
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