Method and apparatus for forming amorphous coating film

Abstract

A method and apparatus for forming an ordinary amorphous coating film not limited to metallic glasses, etc. by thermal spraying.A flame (F) containing material particles is ejected from a nozzle (5) toward a base material (M). The material particles are melted by the flame (F), and these material particles and the flame (F) begin to be cooled before they reach the base material (M).For the cooling, a gas (H) is blown from outer peripheral areas apart from the flame (F) so that the gas (H) approaches the center line for the flame (F). It is preferable that the material particles in the flame (F) have a particle diameter of 10-100 [mu]m.

Description

[0001] Cross-reference of related applications [0002] This application claims the priority of Japanese Patent Application No. 2006-221112 and Japanese Patent Application No. 2007-8477, and the entire contents of the aforementioned Japanese Patent Applications are incorporated herein by reference. technical field [0003] The present invention relates to forming an amorphous (amorphous material) film on the surface of a base material such as a metal by thermal spraying, and to a method and an apparatus for forming an amorphous film by thermal spraying. Background technique [0004] Amorphous (non-crystalline) metals are metals that have an irregular atomic arrangement different from the crystalline state. Since they have high mechanical strength, corrosion resistance, and excellent magnetic properties, various researches and developments are being conducted on their production methods and applications. Various techniques for forming an amorphous coating on the surface of an...

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Problems solved by technology

[0009] But it is not actually easy to quench a thermal spray material to the point where it becomes amorphous

If it is a material that is in a high-temperature state exceeding 2000°C immediately after it is sprayed with the flame, even if it can be quenched at a rate of about 104K / sec or higher, after it is cooled to about several hundred°C, the temperature difference with the surroundings will change. Small and other reasons, it is difficult to achieve the same cooling rate and sufficiently reduce the minimum arrival temperature

In view of the above circumstances, it is difficult to make ordinary amorphous metals (amorphous metals other than metallic glass) amorphous as described in Patent Document 3, so a thermal spraying method for mass-producing amorphous metals on an industrial scale has not been established in reality.

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