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Glass sheet capable of being inhibited from warping through chemical strengthening

A glass plate, chemical technology, applied in the direction of thin material processing, transportation and packaging, etc., can solve the problem of damage to the flatness of float glass

Active Publication Date: 2014-12-10
AGC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It has been reported that float glass warps and impairs flatness after chemical strengthening (Patent Documents 1 to 3)

Method used

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  • Glass sheet capable of being inhibited from warping through chemical strengthening
  • Glass sheet capable of being inhibited from warping through chemical strengthening
  • Glass sheet capable of being inhibited from warping through chemical strengthening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0284] (1) Manufacture of float glass

[0285] A glass plate of the glass material C was produced by the float method so that the plate thickness would be 0.8 mm, and this was cut into 50×50 mm to produce a float plate glass. Using the twin-fluid injector 10 used in the atmospheric pressure CVD method, such as figure 1 As shown in the schematic diagram, make the containing SiO 2 The gas or the gas containing hydrogen fluoride is in contact with the surface of the glass plate. In addition, as a reference for each, make containing N 2 The gas is in contact with the surface of the glass.

[0286] That is, for SiO containing 2 gas, will be mixed with 0.09SLM of SiH 4 Nitrogen with 40.4SLM (N 2 ) gas heated to 150 ° C, at a flow rate of 72 cm / sec from figure 1 The central slit 1 shown blows towards the glass plate, and the O of 4.1SLM 2 and N of 36.5SLM 2 Blow the glass plate from the outer slit 2. As a reference, will be mixed with 40.5SLM of nitrogen (N 2 ) gas heate...

Embodiment 2

[0294] Such as Figure 7 As shown in the schematic diagram shown, the glass made by the float method of the glass material C is put into a quartz tube 50 with a volume of 3.2 L, and after the inside of the tube is vacuumed, the glass is filled with 10% H 2 and 90%N 2 mixed gas filling system. Introduce 10% H into the whole system at a flow rate of 1.6L / min 2 and 90%N 2 While heating the mixed gas for 3 minutes, the temperature of the glass plate 51 is raised. 10%H 2 and 90%N 2 The mixed gas is introduced from the gas introduction direction 53 and discharged along the gas discharge direction 54.

[0295] While heating the heated glass plate 51 at 800° C. for 30 seconds, spray HF or HF at the concentration shown in Table 1 to the glass plate 51 at a flow rate of 0.4 L / min using a gas introduction nozzle 52 with an inner diameter of 3.5 to 4.0 mm. Freon. Then, introduce 10% H at a flow rate of 1.6L / min 2 and 90%N 2 While using the mixed gas, the temperature was lowered ...

Embodiment 3

[0302] Such as Figure 9 As shown in the schematic diagram, an experiment was carried out using a glass plate made of glass material C, having a size of 50 mm×50 mm, and a plate thickness of 0.7 mmt. By actuating the slider 64, the sample 63 of the glass plate placed on the sample holder 62 is moved into the reaction container 61 provided in the center of the tubular furnace 60 previously heated at the processing temperature.

[0303] Next, after carrying out the soaking treatment for 30 seconds, introduce the processing gas (Freon) from the introduction pipe 65 along the direction of the gas introduction direction 67 with the temperature conditions, reaction time and gas concentration shown in Table 2, and keep it for a predetermined time. Exhaust in exhaust direction 68 . After the holding time was over, the sample 63 was taken out by using the sample taking rod 66 after subjecting the sample 63 to the predetermined annealing conditions (500° C. for 1 minute and 400° C. for...

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Abstract

The purpose of the present invention is to provide a glass sheet which can be effectively inhibited from warping through chemical strengthening and which enables polishing, etc., as treatments to be conducted before chemical strengthening, to be omitted or simplified. The invention relates to a glass sheet which, when analyzed with a secondary-ion mass spectrometer (SIMS), gives depth-direction profiles in which the abscissa is depth and the ordinate is F / Si intensity ratio, wherein the average value of the depth-direction profile in the depth range of 0-20 µm of one surface is larger than the average value of the depth-direction profile in the depth range of 0-20 µm of the other surface, the ratio of the two values being higher than 1.4.

Description

technical field [0001] The present invention relates to a glass plate capable of reducing warpage during chemical strengthening. Background technique [0002] In recent years, in flat-panel display devices such as mobile phones and PDAs, a thin plate-shaped cover glass is placed on the front of the display to cover a wider area than the image display portion in order to protect the display and improve appearance. [0003] Light weight and thickness reduction are required for such flat panel display devices, and therefore, cover glasses used for display protection applications are also required to be thinner. [0004] However, if the thickness of the cover glass is reduced, the strength is reduced, and the cover glass itself may be broken when dropped during use or carrying, and there is a problem that the original function of protecting the display device cannot be exhibited. [0005] Therefore, in the conventional cover glass, in order to improve the scratch resistance, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C23/00C03C21/00
CPCC03C21/002C03C15/00C03C23/008Y10T428/31Y10T428/315
Inventor 冈畑直树中川浩司山中一彦渡边邦夫谷井史朗井川信彰小林大介宫下纯一加藤亮祐仁平敏史世良洋一林泰夫府川真
Owner AGC INC
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