Title:
ALUMINUM ALLOY BLANK FOR MAGNETIC DISK AND ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2020/184038
Kind Code:
A1
Abstract:
Provided are an aluminum alloy blank for a magnetic disk and an aluminum alloy substrate for a magnetic disk which exhibit superior impact resistance and have an exceptionally smooth Ni-P plated surface. The aluminum alloy blank for a magnetic disk and the aluminum alloy substrate for a magnetic disk each include prescribed amounts of Mg and Cr and include at most a prescribed amount (or less than a prescribed amount) of Cu, Zn, Mn, Fe and Si, with the remainder consisting of Al and unavoidable impurities. Therein, the maximum length of the Mg-Si intermetallic compounds is also prescribed.
Inventors:
YOSHIZAKI HIROAKI
IZUMI TAKAHIRO
OTSUKA YASUFUMI
UMEDA HIDETOSHI
IZUMI TAKAHIRO
OTSUKA YASUFUMI
UMEDA HIDETOSHI
Application Number:
PCT/JP2020/005299
Publication Date:
September 17, 2020
Filing Date:
February 12, 2020
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C21/06; G11B5/73; G11B5/733; C22F1/00; C22F1/047
Domestic Patent References:
| WO2018155237A1 | 2018-08-30 |
Foreign References:
| JP2011102415A | 2011-05-26 | |||
| JPH10121178A | 1998-05-12 | |||
| JP2005344173A | 2005-12-15 | |||
| JPH07197170A | 1995-08-01 | |||
| JP2018003093A | 2018-01-11 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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