Amorphous alloy, molding die, and method for forming optical element

Patent metadata

Field	Value
Publication number	US-11053151-B2
Application number	US-201815985550-A
Country	US
Kind code	B2
Filing date	May 21, 2018
Priority date	Sep 4, 2014
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

An amorphous alloy contains Ni and Nb and has a composition including at least one of: a composition containing Nb with a content in the range of 35.6 atomic % to 75.1 atomic %, Ir with a content in the range of 7.2 atomic % to 52.3 atomic %, and Ni with a content in the range of 4.0 atomic % to 48.5 atomic %; a composition containing Nb with a content in the range of 19.6 atomic % to 80.9 atomic %, Re with a content in the range of 7.4 atomic % to 59.2 atomic %, and Ni with a content in the range of 4.1 atomic % to 56.9 atomic %; and a composition containing Nb with a content in the range of 7.5 atomic % to 52.9 atomic %, W with a content in the range of 16.4 atomic % to 47.0 atomic %, and Ni with a content in the range of 22.0 atomic % to 53.3 atomic %.

First claim

What is claimed is:

1. An amorphous alloy, comprising:
Nb with a content in a range of 35.6 atomic % to 75.1 atomic %;
Ir with a content in a range of 21.5 atomic % to 52.3 atomic %; and
Ni with a content in a range of 4.0 atomic % to 48.5 atomic %.

2. The amorphous alloy according to claim 1 ,
wherein the Nb content is in a range of 37.4 atomic % to 72.4 atomic %,
and
the Ni content is in a range of 4.0 atomic % to 25.6 atomic %.

3. The amorphous alloy according to claim 1 ,
wherein a sum of the Nb content, the Ir content, and the Ni content is 97.0 atomic % or greater.

4. A molding die, comprising:
a die base; and
a releasing layer made of an amorphous alloy and formed on the die base;
wherein the amorphous alloy has a composition containing Nb, Ir, and Ni,
wherein a content of Nb is in a range of 35.6 atomic % to 75.1 atomic %,
wherein a content of Ir is in a range of 7.2 atomic % to 52.3 atomic %, and
wherein a content of Ni is in a range of 4.0 atomic % to 48.5 atomic %.

5. The molding die according to claim 4 ,
wherein the Ir content of the amorphous alloy is in a range of 21.5 atomic % to 52.3 atomic %.

6. The molding die according to claim 4 ,
wherein a sum of the Nb content, the Ir content, and the Ni content of the amorphous alloy is 97.0 atomic % or greater.

7. The molding die according to claim 4 ,
wherein the releasing layer has a hardness in a range of 12.5 GPa to 23.4 GPa, and
wherein the hardness of the releasing layer is higher than a hardness of the die base.

8. The molding die according to claim 4 , further comprising:
one or more metal layers formed between the releasing layer and the die base.

9. A method for forming an optical element, comprising:
molding a glass preform into a shape by pressing using a molding die including a die base and a releasing layer made of an amorphous alloy having a composition containing Nb with a content in a range of 35.6 atomic % to 75.1 atomic %, Ir with a content in a range of 7.2 atomic % to 52.3 atomic %, and Ni with a content in a range of 4.0 atomic % to 48.5 atomic %.

10. The method according to claim 9 ,
wherein a surface of the glass preform is coated with diamond-like carbon.

Assignees

• Canon Kk

Inventors

• Hata Seiichi
• Midorikawa Satoko
• Fukushima Hirotaka

Classifications

• C22C27/02

  Alloys based on vanadium, niobium, or tantalum · CPC title

• C03B2215/12

  Ceramics or cermets, e.g. cemented WC, Al2O3 or TiC · CPC title

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title

• C22C5/04

  Alloys based on a platinum group metal · CPC title

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title