Nitrogen solid solution titanium sintered compact and method for producing same

Patent metadata

Field	Value
Publication number	US-11802324-B2
Application number	US-202017024508-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Nov 2, 2015
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

An nitrogen solid solution titanium sintered compact includes a matrix made of a titanium component having an α-phase, nitrogen atoms dissolved as a solute of solid solution in a crystal lattice of the titanium component, and metal atoms dissolved as a solute of solid solution in the crystal lattice of the titanium component.

First claim

The invention claimed is:

1. A nitrogen solid solution titanium sintered compact comprising:
a matrix made of a titanium component having an α-phase;
nitrogen atoms dissolved as a solute of solid solution in a crystal lattice of a hexagonal close-packed structure of said titanium component; and
metal atoms dissolved as a solute of solid solution in the crystal lattice of a hexagonal close-packed structure of said titanium component,
wherein
an amount of said nitrogen in the solid solution titanium sintered compact ranges from 0.31 to 0.84 mass %,
a yield strength of the solid solution titanium sintered compact is greater than a yield strength of a pure titanium-based sintered compact at room temperature,
a tensile strength of the solid solution titanium sintered compact is greater than a tensile strength of the pure titanium-based sintered compact at room temperature,
a hardness of the solid solution titanium sintered compact is greater than a hardness of the pure titanium-based sintered compact at room temperature, and
an elongation percentage of the solid solution titanium sintered compact is greater than an elongation percentage of the pure titanium-based sintered compact and is not less than 19.1% at a temperature of 400° C.

2. The nitrogen solid solution titanium sintered compact according to claim 1 , wherein
a compound of said titanium component and said metal atoms exceeding a solid solubility limit of dissolving into the α-phase is dispersed in said matrix.

3. The nitrogen solid solution titanium sintered compact according to claim 1 , wherein a metal of said metal atoms is a metal selected from the group consisting of Al, Si, Cr, V, Mo, Ta, and Zr.

4. The nitrogen solid solution titanium sintered compact according to claim 1 , wherein
the metal atoms are dissolved as the solute of the solid solution by heating a mixture of first powder comprising a titanium component powder made of a titanium component and a second powder comprising nitride particles of a metal other than titanium, and
an amount of said metal nitride particles is within a range of 0.1% to 7% in terms of mass with respect to the total mixture of the first powder and the second powder.

5. The nitrogen solid solution titanium sintered compact according to claim 4 , wherein the amount of said metal nitride particles is in a range of 0.5% to 1.5% in terms of mass with respect to the total mixture of the first powder and the second powder.

6. The nitrogen solid solution titanium sintered compact according to claim 4 , wherein said metal nitride particles comprise silicon nitride particles and the amount of silicon nitride particles is in a range of 0.5% to 1.5% in terms of mass with respect to the total mixture of the first powder and the second powder.

7. A nitrogen solid solution titanium material sintered compact comprising:
a matrix made of a titanium component having an α-phase;
nitrogen atoms dissolved as a solute of solid solution in a crystal lattice of a hexagonal close-packed structure of said titanium component; and
a metal component that is present by being dispersed in said matrix,
wherein
an amount of said nitrogen in the solid solution titanium sintered compact ranges from 0.31 to 0.84 mass %,
a yield strength of the solid solution titanium sintered compact is greater than a yield strength of a pure titanium-based sintered compact at room temperature,
a tensile strength of the solid solution titanium sintered compact is greater than a tensile strength of the pure titanium-based sintered compact at room temperature,
a hardness of the solid solution titanium sintered compact is greater than a hardness of the pure titanium-based sintered compact at room temperature, and
an elongation percentage of the solid solution titanium sintered compact is greater than an elongation percentage of the pure titanium-based sintered compact and is not less than 19.1% at a temperature of 400° C.

8. The nitrogen solid solution titanium sintered compact according to claim 7 , wherein said metal component is made of metal atoms that are deposited in said matrix.

9. The nitrogen solid solution titanium sintered compact according to claim 7 , wherein said metal component is a compound of metal atoms and said titanium component.

10. The nitrogen solid solution titanium sintered compact according to claim 7 , wherein a metal of said metal component is a metal selected from the group consisting of Al, Si, Cr, V, Mo, Ta, and Zr.

11. The nitrogen solid solution titanium sintered compact according to claim 7 , wherein
atoms of the metal component are dissolved as the solute of the solid solution by heating a mixture of first powder comprising a titanium component powder made of a titanium component and a second powder comprising nitride particles of a metal other than titanium, and
an amount of said metal nitride particles is within a range of 0.1% to 7% in terms of mass with respect to the total mixture of the first powder and the second powder.

12. The nitrogen solid solution titanium sintered compact according to claim 11 , wherein the amount of said metal nitride particles is in a range of 0.5% to 1.5% in terms of mass with respect to the total mixture of the first powder and the second powder.

13. The nitrogen solid solution titanium sintered compact according to claim 11 , wherein said metal nitride particles comprise silicon nitride particles and the amount of silicon nitride particles is in a range of 0.5% to 1.5% in terms of mass with respect to the total mixture of the first powder and the second powder.

Assignees

• Hi Lex Corp

Inventors

• Kondoh Katsuyoshi

Classifications

• C22C32/0068

  only nitrides · CPC title

• C22C1/053

  with in situ formation of hard compounds · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• B22F1/145

  Chemical treatment, e.g. passivation or decarburisation · CPC title

• B22F3/14

  simultaneously · CPC title