Titanium sintered body and ornament

Abstract

A titanium sintered body contains an α-phase and a β-phase as crystal structures, wherein the average grain size of the α-phase in a cross section is 3 μm or more and 30 μm or less, and an area ratio occupied by the α-phase in a cross section is 70% or more and 99.8% or less. In the titanium sintered body, it is preferred that the average aspect ratio of the α-phase in a cross section is 1 or more and 3 or less. It is also preferred that the titanium sintered body contains titanium as a main component, and also contains an α-phase stabilizing element and a β-phase stabilizing element.

What is claimed is: 
     
         1 . A titanium sintered body, wherein
 the titanium sintered body contains an α-phase and a β-phase as crystal structures,   the average grain size of the α-phase in a cross section is 3 μm or more and 30 μm or less, and   an area ratio occupied by the α-phase in a cross section is 70% or more and 99.8% or less.   
     
     
         2 . The titanium sintered body according to  claim 1 , wherein the average aspect ratio of the α-phase in a cross section is 1 or more and 3 or less. 
     
     
         3 . The titanium sintered body according to  claim 1 , wherein in an X-ray diffraction spectrum obtained by X-ray diffractometry, the value of a peak reflection intensity by the plane orientation (110) of the β-phase is 3% or more and 60% or less of the value of a peak reflection intensity by the plane orientation (100) of the α-phase. 
     
     
         4 . The titanium sintered body according to  claim 1 , wherein the titanium sintered body contains titanium as a main component, and also contains an α-phase stabilizing element and a β-phase stabilizing element. 
     
     
         5 . The titanium sintered body according to  claim 1 , wherein the titanium sintered body has a relative density of 99% or more. 
     
     
         6 . An ornament comprising the titanium sintered body according to  claim 1 . 
     
     
         7 . An ornament comprising the titanium sintered body according to  claim 2 . 
     
     
         8 . An ornament comprising the titanium sintered body according to  claim 3 . 
     
     
         9 . An ornament comprising the titanium sintered body according to  claim 4 . 
     
     
         10 . An ornament comprising the titanium sintered body according to  claim 5 .