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Aluminum alloy sheet for magnetic disc substrate, production method therefor, and magnetic disc

A technology of aluminum alloy plate and disk substrate, which is applied in the direction of metal rolling, manufacturing of base layer, and manufacture of record carrier, etc., can solve the problem that the surface of the disk cannot be formed sufficiently smoothly, and achieve the effect of excellent surface smoothness of the coating layer.

Active Publication Date: 2019-04-02
FURUKAWA SKY ALUMINUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The method described in Patent Document 1 can make Al-Fe-Mn-based and Mg-Si-based crystals (intermetallic compounds) in the metal matrix finer, but when using the above-mentioned aluminum raw material ingot containing Cl component and When producing molten metal from a Cr raw material containing Cr oxide, there is a problem that even if these crystallized substances are made fine, the surface of the magnetic disk cannot be formed smoothly. Manufacturing conditions, from the viewpoint of obtaining the quenching effect, the slab manufactured in the casting process must be a thin slab with a thickness of 4 to 15mm, and there are also restrictions on manufacturing conditions

Method used

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  • Aluminum alloy sheet for magnetic disc substrate, production method therefor, and magnetic disc
  • Aluminum alloy sheet for magnetic disc substrate, production method therefor, and magnetic disc
  • Aluminum alloy sheet for magnetic disc substrate, production method therefor, and magnetic disc

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Embodiment

[0110] Examples of the present invention will be described below.

[0111] First, using the aluminum raw material ingot with the Cl content shown in Table 1 and the Cr raw material with the Cr oxide amount (excluding alloy Nos. The metal was smelted, and then, the aluminum alloy molten metal was made into an ingot with a thickness of 500 mm by DC casting method, and face cutting of 15 mm on both sides was performed. Next, a homogenization treatment was performed at 510° C. for 6 hours (alloy No. 6 of the example was not included.). Then, hot rolling was carried out at a rolling start temperature of 460° C. and a rolling end temperature of 340° C. to produce a hot-rolled sheet with a thickness of 3.0 mm. Then, for hot-rolled sheets other than alloy No. 7 of the embodiment, When performing intermediate annealing, it rolled by cold rolling (66.7% of rolling ratios) until the final plate thickness was 1.0 mm, and it was set as a cold-rolled sheet (aluminum alloy sheet). For the ...

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Abstract

Provided is an aluminum alloy sheet for magnetic disc substrates, etc. for which plating surface smoothness after plating layer formation is excellent and which can be produced at low cost. This aluminum alloy sheet for magnetic disc substrates has a composition containing, in mass%, Mg: 3.0-8.0%, Cu: 0.002-0.150%, Zn: 0.05-0.60%, Fe: 0.001-0.060%, Si: 0.001-0.060%, Be: 0.00001-0.00200%, Cr: 0.200% or less, Mn: 0.500% or less and Cl: 0.00300% or less, the balance being made of Al and unavoidable impurities. The density of Cr oxides with a maximum diameter of 3-10 [mu]m observed in the metal structure is 1 or less per single side of the disc.

Description

technical field [0001] The present invention relates to an aluminum alloy plate for a magnetic disk substrate having excellent surface smoothness of the plated layer after the plated layer is formed, a method for producing the same, and a magnetic disk produced using the aluminum alloy plate. Background technique [0002] An aluminum alloy magnetic disk used in a computer storage device is manufactured from an aluminum alloy substrate that has good plating properties and excellent mechanical properties and workability. As such an aluminum alloy substrate, for example, a JIS5086 alloy (containing Mg: 3.5 to 4.5% by mass, Fe≦0.50% by mass, Si≦0.40% by mass, Mn: 0.20 to 0.70% by mass, Cr: 0.05 to 0.25% by mass , Cu≦0.10 mass%, Ti≦0.15 mass%, Zn≦0.25 mass%, the balance is Al and unavoidable impurities); by limiting the content of Fe, Si, etc. as impurities in the JIS5086 alloy, the Aluminum alloy substrates with reduced intermetallic compounds or improved platability by adding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06B21B1/00C22C1/02G11B5/73G11B5/82G11B5/84C22F1/00C22F1/047
CPCC22C1/02C22C21/06C22F1/047G11B5/82G11B5/8404G11B5/73919C22C1/026C22C21/08G11B5/73913
Inventor 北胁高太郎村田拓哉日比野旭北村直纪太田裕己藤井康生高桥英希森高志
Owner FURUKAWA SKY ALUMINUM CORP