Dental casting billet material, metal powder for powder metallurgy, dental metal component, and dental prosthesis

Patent metadata

Field	Value
Publication number	US-2016100920-A1
Application number	US-201514852908-A
Country	US
Kind code	A1
Filing date	Sep 14, 2015
Priority date	Oct 9, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A dental casting billet material includes: Co as a main component; Cr in a proportion of 26% by mass or more and 35% by mass or less; Mo in a proportion of 5% by mass or more and 12% by mass or less; and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the billet material is formed from a sintered body of a metal powder, and the billet material has a relative density of 92% or more and 99.5% or less.

First claim

What is claimed is:

1 . A dental casting billet material, comprising:
Co as a main component; Cr in a proportion of 26% by mass or more and 35% by mass or less; Mo in a proportion of 5% by mass or more and 12% by mass or less; and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the billet material is formed from a sintered body of a metal powder, and the billet material has a relative density of 92% or more and 99.5% or less.

2 . A dental casting billet material comprising:
Ni as a main component; Cr in a proportion of 10% by mass or more and 30% by mass or less; Mo in a proportion of 5% by mass or more and 15% by mass or less; and Si in a proportion of 1.0% by mass or more and 3.0% by mass or less, wherein the billet material is formed from a sintered body of a metal powder, and the billet material has a relative density of 92% or more and 99.5% or less.

3 . The dental casting billet material according to claim 1 , wherein
a part of the Si is contained as silicon oxide, and the ratio of Si contained as the silicon oxide to the Si is 10% by mass or more and 90% by mass or less.

4 . The dental casting billet material according to claim 2 , wherein
a part of the Si is contained as silicon oxide, and the ratio of Si contained as the silicon oxide to the Si is 10% by mass or more and 90% by mass or less.

5 . The dental casting billet material according to claim 3 , wherein the silicon oxide is segregated at the grain boundary of the sintered body.

6 . The dental casting billet material according to claim 4 , wherein the silicon oxide is segregated at the grain boundary of the sintered body.

7 . The dental casting billet material according to claim 1 , wherein the average diameter of crystal structures is 3 μm or more and 50 μm or less.

8 . The dental casting billet material according to claim 2 , wherein the average diameter of crystal structures is 3 μm or more and 50 μm or less.

9 . The dental casting billet material according to claim 1 , wherein C is further contained in a proportion of 0.01% by mass or more and 0.09% by mass or less.

10 . The dental casting billet material according to claim 2 , wherein C is further contained in a proportion of 0.01% by mass or more and 0.09% by mass or less.

11 . The dental casting billet material according to claim 9 , wherein the content of N is 0.3 times or more and 10 times or less of the content of C in terms of mass ratio.

12 . The dental casting billet material according to claim 11 , wherein the content of N is 0.3 times or more and 10 times or less of the content of C in terms of mass ratio.

13 . A metal powder for powder metallurgy, comprising:
Co as a main component; Cr in a proportion of 26% by mass or more and 35% by mass or less; Mo in a proportion of 5% by mass or more and 12% by mass or less; and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the metal powder is used for producing a dental member.

14 . A metal powder for powder metallurgy, comprising:
Ni as a main component; Cr in a proportion of 10% by mass or more and 30% by mass or less; Mo in a proportion of 5% by mass or more and 15% by mass or less; and Si in a proportion of 1.0% by mass or more and 3.0% by mass or less, wherein the metal powder is used for producing a dental member.

15 . A dental metal component, comprising:
Co as a main component; Cr in a proportion of 26% by mass or more and 35% by mass or less; Mo in a proportion of 5% by mass or more and 12% by mass or less; and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the dental metal component is obtained by melting and casting a dental member, which is formed from a sintered body of a metal powder, and has a relative density of 92% or more and 99.5% or less.

16 . A dental metal component, comprising:
Ni as a main component; Cr in a proportion of 10% by mass or more and 30% by mass or less; Mo in a proportion of 5% by mass or more and 15% by mass or less; and Si in a proportion of 1.0% by mass or more and 3.0% by mass or less, wherein the dental metal component is obtained by melting and casting a dental member, which is formed from a sintered body of a metal powder, and has a relative density of 92% or more and 99.5% or less.

17 . A dental prosthesis, comprising:
the dental metal component according to claim 10 ; and a porcelain layer provided on the surface of the dental metal component.

18 . The dental prosthesis according to claim 12 , wherein
the porcelain layer contains alumina, and the dental prosthesis further has a mullite phase disposed between the dental metal component and the porcelain layer.

19 . The metal powder for powder metallurgy according to claim 8 , wherein the dental member is a dental casting billet material.

20 . The dental metal component according to claim 10 , wherein the dental member is a dental casting billet material.

Assignees

• Seiko Epson Corp

Inventors

• Nakamura Hidefumi
• Anraku Teruo

Classifications

• C22C1/051

  Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor · CPC title

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• C22C19/07 Primary

  based on cobalt · CPC title

• B22D21/025

  Casting heavy metals with high melting point, i.e. 1000 - 1600 degrees C, e.g. Co 1490 degrees C, Ni 1450 degrees C, Mn 1240 degrees C, Cu 1083 degrees C · CPC title

• A61C13/081

  Making teeth by casting or moulding · CPC title