Titanium powder, titanium material, and method for producing titanium powder containing solid-soluted oxygen

Patent metadata

Field	Value
Publication number	US-2016332233-A1
Application number	US-201415110551-A
Country	US
Kind code	A1
Filing date	Dec 26, 2014
Priority date	Jan 10, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A method for producing titanium powder containing a solid-soluted oxygen comprises the steps of: heating titanium powder comprised of titanium particles in an oxygen-containing atmosphere in a temperature range of 160° or higher and less than 600° C. to form a titanium oxide layer on the surface of the titanium particle; and heating the titanium powder having the titanium oxide layer in an oxygen-free atmosphere in a temperature range of 450° C. or higher and a melting point of the titanium oxide layer or lower to decompose the titanium oxide layer on the surface of the titanium particle so that oxygen atoms dissociated form a solid solution in a matrix of the titanium particle.

First claim

1 . A method for producing titanium powder containing a solid-soluted oxygen, the method comprising:
heating a titanium powder comprising titanium particles in an oxygen-containing atmosphere to form a titanium oxide layer on a surface of each of titanium particles; and heating the titanium powder having the titanium oxide layer in an oxygen-free atmosphere to decompose the titanium oxide layer on the surface of the titanium particle so that oxygen atoms dissociated form a solid solution in a matrix of the titanium particle.

2 . The method for producing titanium powder containing a solid-soluted oxygen according to claim 1 , wherein
a cycle including the formation of the titanium oxide layer and the subsequent decomposition of the titanium oxide layer is repeated a plurality of times to increase an oxygen content to be a solid solution in the matrix of the titanium particle.

3 . The method for producing titanium powder containing a solid-soluted oxygen according to claim 1 , wherein
a heating temperature for forming the titanium oxide layer is 160° C. or higher and less than 600° C., and a heating temperature for decomposing the titanium oxide layer is 450° C. or higher and a melting point of the titanium oxide layer or less.

4 . The method for producing titanium powder containing a solid-soluted oxygen according to claim 1 , wherein
the heat treatment for forming the titanium oxide layer and for decomposing the titanium oxide layer is performed by placing the titanium powder in a rotary kiln furnace.

5 . A titanium powder comprising titanium particles containing a solid-soluted oxygen produced by the method according to claim 1 , wherein
at least one of the titanium particles has on its surface an oxide layer naturally formed in an atmosphere, and the oxygen content in the solid solution in the matrix of the at least one titanium particle is higher than that in the naturally formed oxide layer.

6 . The titanium powder containing a solid-soluted oxygen according to claim 5 , wherein
the titanium particle contains 0.4 to 4.7 mass % of oxygen.

7 . The titanium powder containing a solid-soluted oxygen according to claim 6 , wherein
the titanium particle contains 1.15 to 1.9 mass % of oxygen.

8 . The titanium powder containing a solid-soluted oxygen according to claim 5 , wherein
the titanium particle is made of pure titanium, and an average value of micro Vickers hardness of the matrix of the titanium particle is 200 to 600.

9 . A titanium material compacted into a predetermined shape by using the titanium powder containing a solid-soluted oxygen according to claim 5 .

10 . The titanium material according to claim 9 , wherein
the titanium material is an extruded material produced from pure Ti powder, the extruded material contains 1.2 mass % or more of oxygen, and the extruded material has elongation at break of 18% or more.

11 . The method for producing titanium powder containing a solid-soluted oxygen according to claim 2 , wherein
a heating temperature for forming the titanium oxide layer is 160° C. or higher and less than 600° C., and a heating temperature for decomposing the titanium oxide layer is 450° C. or higher and a melting point of the titanium oxide layer or less.

12 . The method for producing titanium powder containing a solid-soluted oxygen according to claim 2 , wherein
the heat treatment for forming the titanium oxide layer and for decomposing the titanium oxide layer is performed by placing the titanium powder in a rotary kiln furnace.

13 . A titanium powder comprising titanium particles containing a solid-soluted oxygen produced by the method according to claim 2 , wherein
at least one of the titanium particles has on its surface an oxide layer naturally formed in an atmosphere, and the oxygen content in the solid solution in the matrix of the at least one titanium particle is higher than that in the naturally formed oxide layer.

14 . The method for producing titanium powder containing a solid-soluted oxygen according to claim 3 , wherein
the heat treatment for forming the titanium oxide layer and for decomposing the titanium oxide layer is performed by placing the titanium powder in a rotary kiln furnace.

15 . A titanium powder comprising titanium particles containing a solid-soluted oxygen produced by the method according to claim 3 , wherein
at least one of the titanium particles has on its surface an oxide layer naturally formed in an atmosphere, and the oxygen content in the solid solution in the matrix of the at least one titanium particle is higher than that in the naturally formed oxide layer.

16 . A titanium powder comprising titanium particles containing a solid-soluted oxygen produced by the method according to claim 4 , wherein
at least one of the titanium particles has on its surface an oxide layer naturally formed in an atmosphere, and the oxygen content in the solid solution in the matrix of the at least one titanium particle is higher than that in the naturally formed oxide layer.

17 . The titanium powder containing a solid-soluted oxygen according to claim 6 , wherein
the titanium particle is made of pure titanium, and an average value of micro Vickers hardness of the matrix of the titanium particle is 200 to 600.

18 . A titanium material compacted into a predetermined shape by using the titanium powder containing a solid-soluted oxygen according to claim 6 .

19 . The titanium powder containing a solid-soluted oxygen according to claim 7 , wherein
the titanium particle is made of pure titanium, and an average value of micro Vickers hardness of the matrix of the titanium particle is 200 to 600.

20 . A titanium material compacted into a predetermined shape by using the titanium powder containing a solid-soluted oxygen according to claim 7 .

Assignees

• Kondoh Katsuyoshi
• Hi Lex Corp

Inventors

• Kondoh Katsuyoshi

Classifications

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/142

  Thermal or thermo-mechanical treatment · CPC title

• B22F1/12

  Metallic powder containing non-metallic particles (containing lubricating or binding agents or organic material B22F1/10) · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F3/20 Primary

  by extruding · CPC title