Filtration filter

Patent metadata

Field	Value
Publication number	US-11986757-B2
Application number	US-202117323125-A
Country	US
Kind code	B2
Filing date	May 18, 2021
Priority date	Jan 7, 2019
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A filtration filter according to the present invention includes a surface layer composed mainly of Pd, a base material inside the surface layer and composed mainly of a PdNi alloy, and an intermediate layer between the surface layer and the base material, wherein the intermediate layer is composed mainly of a PdNi alloy in which a Pd:Ni ratio changes from a surface layer side toward a base material side.

First claim

The invention claimed is:

1. A filtration filter comprising:
a surface layer composed mainly of Pd;
a base material composed mainly of a PdNi alloy; and
an intermediate layer between the surface layer and the base material, wherein the intermediate layer is composed mainly of a PdNi alloy in which a Pd:Ni ratio changes from a surface layer side toward a base material side.

2. The filtration filter according to claim 1 , wherein a ratio of Ni to Pd in the intermediate layer increases from the surface layer side toward the base material side.

3. The filtration filter according to claim 2 , wherein the intermediate layer has a larger thickness than the surface layer.

4. The filtration filter according to claim 3 , wherein the intermediate layer is in a region with a depth of more than 10 nm and 35 nm or less from a surface of the filtration filter.

5. The filtration filter according to claim 1 , wherein the intermediate layer has a larger thickness than the surface layer.

6. The filtration filter according to claim 5 , wherein the intermediate layer is in a region with a depth of more than 10 nm and 35 nm or less from a surface of the filtration filter.

7. The filtration filter according to claim 1 , wherein
the base material has a Pd:Ni ratio of 80:20, and
the intermediate layer has a Pd:Ni ratio varying in a range of 100:0 to 80:20 from the surface layer side toward the base material side.

8. The filtration filter according to claim 1 , wherein
the base material has a Pd:Ni ratio in a range of 75:25 to 85:15, and
the intermediate layer has a Pd:Ni ratio varying in a range of 100:0 to 75:25 from the surface layer side toward the base material side.

9. The filtration filter according to claim 1 , wherein the surface layer has a Pd:Ni ratio of 100:0.

10. The filtration filter according to claim 1 , wherein the base material has a larger thickness than the surface layer and the intermediate layer.

11. The filtration filter according to claim 1 , wherein the base material includes a first base portion and a second base portion.

12. The filtration filter according to claim 11 , wherein the second base portion has a smaller thickness than the first base portion.

13. The filtration filter according to claim 11 , wherein the first base portion defines a plurality of first through-holes, and the second base portion defines a plurality of second through-holes having a smaller size than the plurality of first through-holes.

14. The filtration filter according to claim 13 , wherein the plurality of second through-holes connect to the plurality of first through-holes.

Assignees

• Murata Manufacturing Co

Inventors

• Banju Masaru
• Kondo Takashi
• Yokota Shusuke

Classifications

• B01D39/2027 Primary

  Metallic material · CPC title

• C12M29/04

  Filters; Permeable or porous membranes or plates, e.g. dialysis · CPC title

• C12M33/14 Primary

  with filters, sieves or membranes · CPC title

• C12M47/02

  Separating microorganisms from the culture medium; Concentration of biomass (separating microorganisms from their culture media C12N1/02) · CPC title

• C12M47/12

  Purification (C12M47/04 takes precedence) · CPC title