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Inorganic composition

A composite and inorganic technology, which is applied in the field of substrates for disk-shaped information recording media, can solve problems such as smoothness changes and large surface properties, and achieve the effects of improving surface recording density, mechanical strength, and recording density

Inactive Publication Date: 2007-04-11
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallized glass produced by this technology can be smoothed at the atomic level by polishing, but the effect of various cleanings in the film formation process as a magnetic film produces a large smoothness in surface properties Sexual changes or problems with tiny bumps

Method used

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  • Inorganic composition
  • Inorganic composition
  • Inorganic composition

Examples

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Embodiment 1～3

[0133] and

[0134] Table 1 is about the examples (No. 1 to 3) of crystallized glass that is the inorganic composition of the present invention and the previous three types of Li 2 SiO 3 Crystalline-like glass (comparative example 1: disclosed in Japanese Patent Laid-Open No. 62-72547, Comparative Example 2: disclosed in Japanese Patent Laid-Open No. 9-35234, Comparative Example 3: disclosed in Japanese Patent Laid-Open No. Hei 12-302481 Bulletin), and the previous Li 2 O-SiO 2 Amorphousglass (Comparative Example 4), which together show the ratio of its component composition, the nucleation temperature, crystallization temperature, crystal phase, crystallinity, average grain size, hoop bending strength of crystallized glass , The surface roughness Ra (arithmetic average roughness) formed by grinding, the value of the surface roughness change amount and the surface roughness change rate, specific gravity, Young's modulus, and thermal expansion coefficient after the grinding proce...

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Abstract

The present invention provides an inorganic composition for use in information recording medium disc substrate and such, having an excellent surface property capable of sufficiently corresponding with a ramp load system for high density recording, a high degree of tolerability to high speed rotation, and high productivity at a low melting point. Specifically, this invention provides an inorganic composition containing one crystalline phase selected from the group consisting of Alpha-quartz (Alpha-SiO 2 ), lithium disilicate (Li 2 Si 2 O 5 ) and lithium monosilicate (Li 2 SiO 3 ), or that contain at least a crystalline phase of lithium monosilicate (Li 2 SiO 3), in which a mean particle diameter of a particle showing a crystalline phase contained in the inorganic composition is 1 mum or less, a ring flexural strength is 300 MPa or more, and a surface roughness (an arithmetic mean roughness) thereof after a polishing process is 10AA or less.

Description

Technical field [0001] The invention relates to an inorganic composition, which has small particle size, good mechanical strength, excellent surface roughness with little change in surface roughness of a substrate after acid or alkali surface treatment, and good adaptability to other materials. Thermal expansion characteristics. In particular, it relates to a substrate for a magnetic recording medium used in various information magnetic recording devices, particularly a substrate for a disk-shaped information recording medium that has both surface ultra-smoothness, cleanability, and high strength among perpendicular magnetic recording media. By. In addition, the so-called "information recording medium" in the present invention refers to a hard disk that can be used as a personal computer, and refers to a fixed hard disk, a portable hard disk, a card-type hard disk, a digital video camera or a digital camera, an audio hard disk, and a car navigation system. Information magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04C03C10/14
Inventor 后藤直雪八木俊刚岸孝之
Owner OHARA
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