Aluminum alloy substrate for magnetic disk
US-2017327930-A1 · Nov 16, 2017 · US
Base for magnetic recording medium
US9875765B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9875765-B2 |
| Application number | US-201615271359-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 21, 2016 |
| Priority date | Dec 25, 2015 |
| Publication date | Jan 23, 2018 |
| Grant date | Jan 23, 2018 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A base for a magnetic recording medium includes, a substrate made of an Al alloy, and a film made of a NiP-based alloy and provided on the substrate. The Al alloy of the substrate includes Mg in a range of 0.2 mass % to 6 mass %, Si in a range of 3 mass % to 17 mass %, Zn in a range of 0.05 mass % to 2 mass %, and Sr in a range of 0.001 mass % to 1 mass %. An average grain diameter of Si grains in an alloy structure of the substrate is 2 μm or less. The film has a thickness of 10 μm or greater. The substrate has an outer diameter of 53 mm or greater, a thickness of 0.9 mm or less, and a Young's modulus of 79 GPa or higher.
First claim
Opening claim text (preview).
What is claimed is: 1. A base for a magnetic recording medium, comprising: a substrate made of an Al alloy; and a film made of a NiP-based alloy and provided on the substrate, wherein the Al alloy of the substrate includes Mg in a range of 0.2 mass % to 6 mass %, Si in a range of 3 mass % to 17 mass %, Zn in a range of 0.05 mass % to 2 mass %, and Sr in a range of 0.001 mass % to 1 mass %, wherein an average grain diameter of Si grains in an alloy structure of the substrate is 2 μm or less, wherein the film has a thickness of 10 μm or greater, and wherein the substrate has an outer diameter of 53 mm or greater, a thickness of 0.9 mm or less, and a Young's modulus of 79 GPa or higher. 2. The base for the magnetic recording medium as claimed in claim 1 , wherein the film is made of a NiP-based alloy that includes P in a range of 15 mass % to 35 mass %. 3. The base for the magnetic recording medium as claimed in claim 1 , wherein the film is made of a NiWP-based alloy that includes W in a range of 15 mass % to 22 mass %, and P in a range of 3 mass % to 10 mass %. 4. The base for the magnetic recording medium as claimed in claim 1 , which is a plated-base having the film plated on the substrate.
Assignees
Inventors
Classifications
Modified aluminium-silicon alloys · CPC title
- G11B5/73Primary
Base layers {, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer} · CPC title
Disk carriers · CPC title
with silicon · CPC title
- G11B5/7315Primary
Physics · mapped topic
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US9875765B2 cover?
- A base for a magnetic recording medium includes, a substrate made of an Al alloy, and a film made of a NiP-based alloy and provided on the substrate. The Al alloy of the substrate includes Mg in a range of 0.2 mass % to 6 mass %, Si in a range of 3 mass % to 17 mass %, Zn in a range of 0.05 mass % to 2 mass %, and Sr in a range of 0.001 mass % to 1 mass %. An average grain diameter of Si grains…
- Who is the assignee on this patent?
- Showa Denko Kk
- What technology area does this patent fall under?
- Primary CPC classification G11B5/73. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 23 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).