Ni-Cr-Co-based alloy having high-temperature corrosion resistance, and poppet valve surface-modified with the same

Patent metadata

Field	Value
Publication number	US-9441287-B2
Application number	US-201314438959-A
Country	US
Kind code	B2
Filing date	Oct 8, 2013
Priority date	Oct 31, 2012
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

There is provided a surface-coating material having excellent cracking resistance and peeling resistance, and having excellent high-temperature corrosion resistance properties; and a poppet valve coated with the surface-coating material. The Ni—Cr—Co-based alloy comprises 40.0 to 50.0 mass % of Cr, 10.0 to 20.0 mass % of Co, 0.5 to 5.0 mass % of Nb, 0.01 to 5.0 mass % of Fe and 0.1 to 3.0 mass % of Si, with the remainder being 26.0 to 40.0 mass % of Ni and unavoidable impurities. The Ni—Cr—Co-based alloy may additionally comprise one or more elements selected from Mo, W, Mn, Ti, Al, B and C in a total amount of 5.0 mass % or less. The content of each of Ti and Al is 3.0 mass % or less and the content of each of B and C is 1.0 mass % or less. In the poppet valve, at least a face portion is coated with the Ni—Cr—Co-based alloy.

First claim

The invention claimed is:

1. A poppet valve, which is subjected to surface modification through any application process selected from spraying, overlaying, and vapor deposition, using a Ni—Cr—Co-based alloy having high-temperature corrosion resistance and having a composition of:
40.0 to 50.0 mass % of Cr;
10.0 to 20.0 mass % of Co;
0.5 to 5.0 mass % of Nb;
0.01 to 5.0 mass % of Fe;
0.1 to 3.0 mass % of Si; and
the remainder being 26.0 to 40.0 mass % of Ni and unavoidable impurities.

2. The poppet valve according to claim 1 , wherein the surface modification is applied to at least a face portion.

3. A poppet valve, which is subjected to surface modification through any application process selected from spraying, overlaying, and vapor deposition, using a Ni—Cr—Co-based alloy having high-temperature corrosion resistance and having a composition of:
40.0 to 50.0 mass % of Cr;
10.0 to 20.0 mass % of Co;
0.5 to 5.0 mass % of Nb;
0.01 to 5.0 mass % of Fe;
0.1 to 3.0 mass % of Si;
one or more elements selected from Mo, W, Mn, Ti, Al and B in a total amount of 5.0 mass % or less, the content of each of Ti and Al being 3.0 mass % or less, and the content of B being 1.0 mass % or less; and
the remainder being 26.0 to 40.0 mass % of Ni and unavoidable impurities.

4. The poppet valve according to claim 3 , wherein the surface modification is applied to at least a face portion.

Assignees

• Fukuda Metal Foil & Powder Co Ltd
• Nittan Value Co Ltd
• Nittan Valva

Inventors

• Otobe Katsunori
• Nishimura Shinichi
• Kurahashi Kazunori
• Takahashi Yoshihiro

Classifications

• F01L2820/01

  Absolute values · CPC title

• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• C22C27/06 Primary

  Alloys based on chromium · CPC title

• F16K25/005

  Particular materials for seats or closure elements · CPC title

• C22C30/00

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