Hitachi, Ltd.

Kuroki Kogyosho Co., Ltd

Akira Matsunawa

Seiji Katayama

Takeshi Araya

Susumu Hioki

Yoshishige Endo

Ryoji Okada

Mitsuaki Haneda

Yoshiro Ibaraki

Takanori Kuroki

The process for forming an ultrafine-particle film according to this invention is characterized by irradiating the surface of a target of a raw material with laser energy in a predetermined atmosphere under conditions where a plume is generated, exposing a substrate (a base material) directly to the plume generated, and thereby forming a film. The substrate is positioned in the plume at a distance, from the surface of the target of the raw material, of at least the mean free path of atoms and/or molecules of the raw material (or components thereof). By so positioning the substrate, ultrafine particles of the raw material are deposited on the substrate. The plume containing a large amount of ultrafine particles moves at a high speed; and exposure of the substrate, at the specified position relative to the target, to the plume causes strong adhesion of ultrafine particles contained in the plume to the substrate, resulting in formation of a film.

Laser deposition process for forming an ultrafine-particle film

A method metallurgically bonds a thin film of easily amorphized material on a metallic substrate having a large thermal conductivity, and then irradiates all or selected portions of the thin film with a pulse laser. The irradiated portions become amorphous by rapidly heating and cooling. Therefore, a whole surface which is an amorphous layer or a part of a surface which is an amorphous layer is obtained. In the latter, a porous amorphous metal layer is obtained by subsequent acid elution and by removing the non-amorphous part.

Method for producing amorphous metal layer

A method of efficiently manufacturing ultra-fine particles of material, comprising a step of applying laser energy to the material in order to generate a plume phenomenon thereon to cause the ultra-fine particles. The material may be selected from various materials such as non-metal materials as well as metal materials.

Method of manufacturing ultra-fine particles

Growing community of inventors

Nishinomiya, Japan

Akira Matsunawa