Aluminum alloy member and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2023175159-A1
Application number	US-202117913035-A
Country	US
Kind code	A1
Filing date	Mar 10, 2021
Priority date	Mar 27, 2020
Publication date	Jun 8, 2023
Grant date	—

Abstract

The present invention provides: an aluminum alloy member which can be manufactured at a relatively low cost and has a light weight, and which can have high dimensional accuracy under a high-temperature environment and is less likely to undergo the color-fading of a blackened surface even under a high-temperature environment, and has excellent heat resistance; and a method for manufacturing the aluminum alloy member with high efficiency. The aluminum alloy member according to the present invention comprises: a substrate which comprises an extruded material of an aluminum powder alloy having an Si content of 20 to 40% by mass and has an anodic oxide coating film formed on the surface thereof, and an electrolytically colored layer which is formed by precipitating a metal or a metal salt on voids in the anodic oxide coating film.

First claim

1 . An aluminum alloy member which comprises:
an extruded material of an aluminum powder alloy having an Si content of 20 to 40% by mass, and includes a substrate having an anodic oxide coating film on the surface, and an electrolytically colored layer which is formed by precipitating a metal or a metal salt on voids in the anodic oxide coating film.

2 . The aluminum alloy member according to claim 1 , wherein
the aluminum powder alloy contains Si: 20 to 40% by mass, Mg: 0.2 to 1.2% by mass, Cu: more than 0 to 2% by mass or less, Fe: more than 0 to 2% by mass or less, Cr: more than 0 to 0.4% by mass or less, and the balance is composed of Al and unavoidable impurities.

3 . The aluminum alloy member according to claim 1 , wherein
the metal and the metal salt contain at least one of Ni, Co, Cu, Sn, Mn, Fe, Pb, Ca, Zn and Mg.

4 . The aluminum alloy member according to claim 1 , wherein
the linear expansion coefficient is 10×10 −6 to 23×10 −6 /K.

5 . The aluminum alloy member according to claim 1 , wherein
the difference between the L* value after the heat treatment and the L* value before the heat treatment held in an atmosphere of 200° C. for 100 hours is 3 or less.

6 . The aluminum alloy member according to claim 1 , wherein the member is an optical member or a member for an optical member inspection device.

7 . A method for manufacturing an aluminum alloy member, which includes:
a first step of manufacturing a substrate by subjecting an aluminum alloy powder having a Si content of 20 to 40% by mass to pressure molding, sintering and extrusion processing, a second step of forming an anodic oxide film on the surface of the substrate, and a third step of electrolytically coloring the substrate in an electrolytic solution containing a metal or a metal salt to form an electrolytically colored layer on the surface of the substrate by precipitating a metal or a metal salt on voids in the anodic oxide coating film.

Assignees

• Nippon Light Metal Co

Inventors

• Iizuka Akira
• Komura Naoto
• Nakano Koichi

Classifications

• C22C1/04

  by powder metallurgy (C22C1/08 takes precedence) · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title

• C22C1/0416

  Aluminium-based alloys · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• C22F1/043

  of alloys with silicon as the next major constituent · CPC title