Magnetic Recording Glass Substrate Composition for Vibration Control
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Solution Overview
Problem
Magnetic recording medium substrates made of aluminum alloys are prone to deformation, necessitating the use of glass substrates that can withstand high-speed rotation without significant vibration, and existing glass substrates for magnetic recording media do not adequately support various molding methods or provide sufficient rigidity.
Innovation Solution
Development of amorphous glass compositions for magnetic recording medium substrates with specific viscosity and elastic modulus characteristics, including varying contents of Li2O, Na2O, and other oxides, suitable for various molding methods and providing high rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If glass substrate thickness is reduced to increase recording capacity, then more magnetic recording media can be installed in HDD, but vibration during high-speed rotation increases
Solution Approach 1:
The patent changes the material parameters of the glass substrate by optimizing its composition (specific ratios of SiO2, B2O3, Al2O3, and other oxides) to achieve a specific elastic modulus of 35.0 MNm/kg or more. This parameter optimization allows the substrate to maintain high rigidity even at reduced thickness, thereby suppressing vibration during high-speed rotation while enabling increased recording capacity through multiple platters.
2Ease of manufacture
If aluminum alloy substrate is used, then manufacturing is easier, but deformation susceptibility increases
Solution Approach 1:
The patent employs glass as a composite material alternative to aluminum alloy substrates. The glass substrate comprises a specific composition of oxides (SiO2, B2O3, Al2O3, and others) that provides both dimensional stability and resistance to deformation during high-speed rotation, while still being manufacturable through established glass molding techniques.
3Ease of manufacture
If existing glass composition is used, then molding process is simplified, but rigidity is insufficient for high-speed rotation
Solution Approach 1:
The patent optimizes the chemical composition parameters of the glass substrate, specifically controlling the contents of SiO2 (50-70 mol%), B2O3 (0-10 mol%), Al2O3 (10-20 mol%), and other oxides to achieve a specific elastic modulus of 35.0 MNm/kg or more. This composition optimization maintains compatibility with existing molding processes while significantly improving rigidity for high-speed rotation applications.
Data Source
AI summary
Provided is a glass for a magnetic recording medium substrate wherein a temperature T1 at a viscosity of 102.0 dPa·s is 1600°C or less, and a specific elastic modulus is 34.0 MNm/kg or more.