Ion exchange surface enhancing method for glass substrates of magnet recording discs

A glass substrate and ion exchange technology, applied in the manufacture of record carriers, etc., can solve the problems of high energy consumption, long processing cycle of glass ceramics, and high production cost

Inactive Publication Date: 2003-06-18
YINGLI SCI & TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese patents JP Ping-92680A and USP5476821A disclose a typical glass-ceramic product, but the key glass-ceramic processing cycle is long, energy consumption is large, and the production cost is high, which affects its application to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: adopt soda lime silicate glass substrate, its basic composition (wt%) is: SiO 2 72%, Na 2 O 13%, CaO 5%, MgO 3.5%, Al 2 o 3 1.1%. First, use the dipping method to process: process the glass of the above composition into a glass substrate with a thickness d≤1.8mm and a diameter φ≤9.0cm, put it in a closed box, hang the glass substrate properly with a suitable hanger, and then impregnated with K + In the ionic salt, that is, KNO3 ion exchange molten salt solution, the immersion temperature is 360° C., and the immersion time is 10 hours. Its ion exchange mode is K + →Na + (exchange ion K + →The substrate is exchanged with ions Na + ). Then place the substrate in a closed box, and use the dual temperature zone method for treatment: first, at a temperature of 595 ° C, the + and Ba 2+ Salt KNO 3 or KCl and Ba(NO 3 ) 2 Heat the blended salt mixed at 50%: 50% (WT%), and make it evaporate to generate the corresponding metal ion vapor; then stand s...

Embodiment 2

[0017] Embodiment two: adopt the i.e. sheet of soda-lime silicate glass, its composition (wt%) is: SiO 2 73%, Na 2 O 12.5%, CaO 8.6%, MgO 4.1%, Al 2 o 3 1.6, Li 2 O 0.4%, B 2 o 3 Appropriate amount. First, use the dipping method to process: process the glass of this composition into a glass substrate with a thickness d≤1.8mm and a diameter φ≤9.0cm, put it in a closed box, hang the glass substrate properly with a suitable hanger, and then impregnated with K + , Li + The salt of the ion, ie KNO 3 (70wt%) and LiNO 3 (30wt%) blended salt molten salt solution, the immersion temperature is 400°C, and the immersion time is 12 hours. Its ion exchange mode is K + →Na+ (exchange ion K + →The substrate is exchanged with ions Na + ). Then place the substrate in a closed box, and use the dual-temperature zone method for treatment: first, at 600 ° C, the Li-containing + 、K + and Ba 2+ the salt of LiNO 3 (20wt%), KNO 3 (40wt%) and Ba(NO 3 ) 2 (40wt%) blended salt is he...

Embodiment 3

[0019] Embodiment three: adopt the i.e. sheet of soda-lime silicate glass, its composition (wt%) is: SiO 2 63%, Na 2 O 15.2%, CaO 1.2%, MgO 0.8%, Al 2 o 3 4%, Li 2 O 6%, ZnO 5.8%. First, use the dipping method to process: process the glass of this composition into a glass substrate with a thickness d≤1.8mm and a diameter φ≤9.0cm, put it in a closed box, hang the glass substrate properly with a suitable hanger, and then impregnated with K + 、Na + The salt of the ion, ie KNO 3 (75wt%) and NaNO 3 (25wt%) blended salt molten salt solution, the immersion temperature is 380°C, and the immersion time is 20 hours. Its ion exchange method is: K + → Na + , Li + (exchange ion K + →The substrate is exchanged with ions Na + , Li + ). Then place the substrate in a closed box, and use the dual-temperature zone method for treatment: first, at a temperature of 620 ° C, the + and Ba 2+ the salt of KNO 3 (50wt%) and Ba(NO 3 ) 2 (50%wt%) blended salt is heated and evaporated...

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Abstract

An ion exchange process for reinforcing the surface of NaCaSi or NaAlSi glass substrate of magnetic record disc features use of both dipping and dual temp zones. Beside its surface is reinforced by K ion exchange, the salts of Li, K and Na ions are in one temp zone and their relative atmosphere is in another temp zone for ion exchange. Its advantage is high effect.

Description

technical field [0001] The invention relates to an ion exchange surface enhancement method on the surface of a glass substrate of a magnetic recording memory, and belongs to the technical field of heat treatment on the surface of glass materials. Background technique [0002] At present, magnetic memory memory used in the form of digital recording has involved various fields of information technology, especially magnetic recording hard disks used in computer communication technology, various types of mobile communication memory, game consoles, laptop computers and other magnetic recording disk substrates all need A high-capacity disk is used to increase its recording density. For this reason, the unit size of the link (bit) is reduced, and the magnetic head and the magnetic disk are operated at a floating height of 25 μm. This structure basically enables the two to work in a state close to contact. Therefore, the substrate used as a magnetic recording medium carrier should ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00G11B5/84
CPCC03C21/002C03C21/007
Inventor 刘重庆高为彪
Owner YINGLI SCI & TECH SHANGHAI
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