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Glass composition suitable for chemical strengthening and chemically strengthened glass article

A glass composition and glass transition temperature technology, which is applied to the base layer of the recording layer, magnetic recording, information storage, etc., can solve the problems of low content rate and reduced glass melting, and achieve the effect of high heat resistance

Active Publication Date: 2013-12-18
NIPPON SHEET GLASS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the content of the divalent metal oxide RO (MgO, CaO, SrO, BaO) is too low, the solubility of the glass will decrease

Method used

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  • Glass composition suitable for chemical strengthening and chemically strengthened glass article
  • Glass composition suitable for chemical strengthening and chemically strengthened glass article
  • Glass composition suitable for chemical strengthening and chemically strengthened glass article

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Embodiment

[0101] (Production and evaluation of glass composition)

[0102] According to the glass composition shown in Table 1 to Table 4 and Comparative Examples 1, 6 to 9 in Table 5, silica, titania, alumina, lithium carbonate, sodium carbonate, potassium carbonate, alkali are used as general glass raw materials Blending glass raw materials (batch materials) with natural magnesium carbonate, calcium carbonate, strontium carbonate and barium carbonate. Among them, regarding Examples 41 to 48, iron oxide was further added to the glass raw material to make a part of the sodium carbonate become sodium sulfate. The prepared batch was put into a platinum crucible and heated in an electric furnace at 1650°C for 4 hours to prepare molten glass. Next, the molten glass is poured out on an iron plate, cooled, and made into a glass block. This glass block was put into the electric furnace again, and after keeping it at 620° C. for 30 minutes, the power supply of the furnace was turned off, and the...

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Abstract

A glass composition that has a high heat resistance, is suitable for chemical strengthening, and is suitable for use in a large-scale facility for the mass production of glass plates by the float glass process, and the like, is a glass composition comprising, by mass%, 60 to 66% of SiO2, 10 to 16% of Al2O3, 0 to 1% of B2O3, 3 to 10% of MgO, 0 to 1% of CaO, 1 to 9% of SrO, 0 to 4% of BaO, 0 to 2% of ZnO, 0 to 1% of Li2O, 10 to 20% of Na2O, 0 to 5% of K2O, 0 to 2% of TiO2, and 0 to 0.1% of ZrO2, wherein MgO + CaO + SrO + BaO is within a range of 10 to 20%, Li2O + Na2O + K2O is within a range of 14 to 20%, and the Sr content is greater than the CaO content.

Description

Technical field [0001] The present invention relates to a glass composition suitable for chemical tempering. More specifically, it relates to a glass composition having characteristics suitable as a glass substrate of a magnetic recording medium such as a magnetic disk. In addition, the present invention relates to chemically tempered glass articles. Background technique [0002] Glass materials are raw materials that can achieve high surface smoothness and high surface hardness. Therefore, the glass material is suitable as a substrate of a magnetic recording medium that records information using a magnetic recording device represented by a hard disk drive (HDD). When used as a substrate of a magnetic recording medium, the glass substrate is usually subjected to chemical tempering to supplement strength. [0003] Chemical toughening is a technique in which alkali metal ions contained in the surface of a glass substrate are replaced with monovalent ions with a larger radius, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/085C03C3/087C03C3/091C03C3/093C03C21/00G11B5/73
CPCC03C3/085C03C21/002Y10T428/315C03C3/087G11B5/73921
Inventor 千秋裕仓知淳史
Owner NIPPON SHEET GLASS CO LTD