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Patent Searching and Data


Title:
SURFACE TREATMENT METHOD FOR METAL PRODUCT AND METAL PRODUCT
Document Type and Number:
WIPO Patent Application WO/2017/199918
Kind Code:
A1
Abstract:
Provided is a surface treatment method capable of continuously forming a uniform nanocrystalline structure along the surface of a metal product regardless of whether the metal product is hard or soft. In the present invention, a substantially spherical spray powder having a median diameter of 1-20 µm and a fall velocity in the air of 10 sec/m or more is sprayed onto a metal product at a spray pressure of 0.05-0.5 MPa. Thus even when the metal product is made of a soft material in a range from the surface of the metal product to a predetermined depth along the surface, it is possible to form a uniform continuous nanocrystalline structure layer in which nanocrystals are micronized to an average crystal grain size of not more than 300 nm, preferably not more than 100 nm, without forming a laminar worked structure, impart a high compression residual stress of from about -180 MPa up to the order of -1200 MPa, and strengthen the surface of the metal product.

Inventors:
MASE, Keiji (2-24, Matsue 5-chom, Edogawa-ku Tokyo 25, 〒1320025, JP)
ISHIBASHI, Shozo (2-24, Matsue 5-chom, Edogawa-ku Tokyo 25, 〒1320025, JP)
KONDO, Yusuke (2-24, Matsue 5-chom, Edogawa-ku Tokyo 25, 〒1320025, JP)
Application Number:
JP2017/018229
Publication Date:
November 23, 2017
Filing Date:
May 15, 2017
Export Citation:
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Assignee:
FUJI MANUFACTURING CO., LTD. (2-24, Matsue 5-chome Edogawa-ku Tokyo, 25, 〒1320025, JP)
International Classes:
C22F1/04; B24C1/10; C21D7/06; C22F1/00
Foreign References:
JP3879059B22007-02-07
JP5341971B22013-11-13
JP2009091606A2009-04-30
JP3150048U2009-04-30
Attorney, Agent or Firm:
OGURA & CO. (YMG Shinbashi Bldg. 5F, 13-4 Shinbashi 5-chom, Minato-ku Tokyo 04, 〒1050004, JP)
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