Hoya Corporation

Agc Inc.

Kenichiro Terada

Hideki Isono

Katsuyuki Iwata

Kinobu Osakabe

Shinji Eda

Kenji Yamada

Shinya Kikugawa

Nobuhiro Shinohara

Yasuo Shinozaki

Shunsuke Susa

The present invention relates to a method of producing a SiC—Si composite component. The method includes preparing a first molded body containing SiC particles by a 3D printing method, wherein the first molded body has a first average pore diameter M;

Method of producing SiC—Si composite component and SiC—Si composite component

A glass substrate for a magnetic disk of the invention is a disk-shaped glass substrate for a magnetic disk where the substrate has a main surface and end face and is subjected to chemical reinforcement treatment, and is characterized in that the penetration length in the uppermost-portion stress layer on the main surface is 49.1 &#x3bc;m or less, and that assuming that an angle between the main surface and compressive stress in the stress profile by a Babinet compensator method is &#x3b8;, a value y of {12&#xb7;t&#xb7;ln(tan &#x3b8;)+(49.1/t)} is the penetration length in the uppermost-portion stress layer or less.

Glass substrate for magnetic disk and manufacturing method of the same

The present invention provides a method for producing a glass substrate for a magnetic disk in which the occurrence of micro-waviness on the glass substrate is prevented in a cooling step after a chemically strengthening step so that the glass substrate has a significantly smooth principal surface, and provides a method for producing a magnetic disk in which head crash, thermal asperity failures, and the like are prevented, the flying height of a magnetic head can be decreased, and high-density recording is enabled. In a method for producing a glass substrate for a magnetic disk including a chemically strengthening step in which a glass substrate is immersed in a heated chemically strengthening salt solution prepared by dissolving a chemically strengthening salt under heating, and metal ions in the glass substrate are ion-exchanged with metal ions in the chemically strengthening salt, wherein the chemically strengthening step is carried out using a chemically strengthening salt solution in which the dissolved chemically strengthening salt does not solidify until the temperature decreases to a temperature that provides hardness at which the surface shape of the glass substrate is not deformed by a force applied to the glass substrate when the chemically strengthening salt having adhered onto the glass substrate solidifies.

Method for producing glass substrate for magnetic disk and method for producing magnetic disk

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Tokyo, Japan

Kenichiro Terada