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US 12,243,570 B2Granted
Aluminum alloy substrate for magnetic disc and magnetic disc
AssigneeFurukawa Electric Co., Ltd.
InventorsKotaro Kitawaki, Hideyuki Hatakeyama, Wataru Kumagai, Ryo Sakamoto
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Abstract
An aluminum alloy substrate for a magnetic disc is made of an aluminum alloy, containing Fe: 1.80 mass % or less, Mn: 0.70 mass % or less, Ni: 2.50 mass % or less, Si: 2.50 mass % or less, Cu: 1.00 mass % or less, Zn: 0.48 mass % or less and Mg: 1.00 to 3.50 mass %, wherein a total content of Fe, Mn and Ni is 1.60 to 4.50 mass % and a mass ratio of Cu/Zn is 0.01 to 0.35 or 6.00 to 50.00, with a balance being Al and inevitable impurities.
Claims7
An aluminum alloy substrate for a magnetic disc made of an aluminum alloy, comprising Fe:
- 0.10 mass % or more and 1.80 mass % or less, Mn:
- 0.10 mass % or more and 0.70 mass % or less, Ni:
- 0.10 mass % more and 2.50 mass % or less, Si:
- 2.50 mass % or less, Cu:
- 0.003 mass % or more and 1.00 mass % or less, Zn:
- 0.003 more and 0.48 mass % or less and Mg:
- 1.00 to 3.50 mass %, wherein Fe, Mn and Ni has a total content that is 1.60 to 4.50 mass % and a mass ratio of Cu/Zn is 0.01 to 0.35 or 6.00 to 50.00, with a balance being Al and inevitable impurities.
4 more elements
Dependencies are inferred from the claim text.