Ornament

Patent metadata

Field	Value
Publication number	US-2017192392-A1
Application number	US-201715398039-A
Country	US
Kind code	A1
Filing date	Jan 4, 2017
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

An ornament includes a sintered body, in which Fe, Cr, Ni, Si, and C are contained, and when one element selected from the group consisting of Ti, V, Y, Zr, Nb, Hf, and Ta is defined as a first element, and one element selected from the group, and having a higher group number in the periodic table than that of the first element or having the same group number as that of the first element and a higher period number than that of the first element is defined as a second element, the first element is contained in a proportion of 0.01 mass % or more and 0.5 mass % or less, and the second element is contained in a proportion of 0.01 mass % or more and 0.5 mass % or less.

First claim

What is claimed is:

1 . An ornament, comprising a sintered body, wherein in the sintered body,
Fe is contained as a major component, Cr is contained in a proportion of 15 mass % or more and 26 mass % or less, Ni is contained in a proportion of 7 mass % or more and 22 mass % or less, Si is contained in a proportion of 0.3 mass % or more and 1.2 mass % or less, C is contained in a proportion of 0.005 mass % or more and 0.3 mass % or less, and when one element selected from the group consisting of Ti, V, Y, Zr, Nb, Hf, and Ta is defined as a first element, and one element selected from the group consisting of Ti, V, Y, Zr, Nb, Hf, and Ta, and having a higher group number in the periodic table than that of the first element or having the same group number in the periodic table as that of the first element and a higher period number in the periodic table than that of the first element is defined as a second element, the first element is contained in a proportion of 0.01 mass % or more and 0.5 mass % or less, and the second element is contained in a proportion of 0.01 mass % or more and 0.5 mass % or less, and in a cross section of a surface layer with a thickness of 200 μm from the surface, when the area ratio of a first region D 1 in which Fe is contained as a major component is represented by P 1 and the area ratio of a second region D 2 in which Si or O is contained as a major component is represented by P 2 , P 2 /(P 1 +P 2 ) is 0.3% or less.

2 . The ornament according to claim 1 , wherein the relative density of the sintered body is 98% or more.

3 . The ornament according to claim 1 , wherein the sintered body has an austenite crystal structure.

4 . The ornament according to claim 1 , wherein the ornament is an external component for timepieces.

Assignees

• Seiko Epson Corp

Inventors

• Nakamura Hidefumi

Classifications

• B22F5/106

  Tube or ring forms · CPC title

• C21D2211/001

  Austenite · CPC title

• C22C38/48

  with niobium or tantalum · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title

• G04B45/00 Primary

  Time pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effects (ornamental shaping of dials G04B19/10 ){(lubrication of clockwork bearings G04B31/008; special effects and pictures in general B44F)} · CPC title