Titanium porous body, and method for producing titanium porous body
The titanium porous body according to the present invention is in a form of a sheet, and has a thickness of 0.3 mm or less, and a bending strain at break of 0.005 or more, wherein, for a three-dimensional surface texture of at least one surface of the titanium porous body, an arithmetic mean height Sa is 2.5 μm or less, a maximum height Sz is 30 μm or less, an aspect ratio Str of the surface texture is 0.93 or more, and an arithmetic mean curvature Spc of a peak is 4.8 (1/μm) or less.
1 . A titanium porous body in a form of a sheet, the titanium porous body having:
a thickness of 0.3 mm or less, and
a bending strain at break of 0.005 or more,
wherein, for a three-dimensional surface texture of at least one surface of the titanium porous body, an arithmetic mean height Sa is 2.5 μm or less, a maximum height Sz is 30 μm or less, an aspect ratio Str of the surface texture is 0.93 or more, and an arithmetic mean curvature Spc of a peak is 4.8 (1/μm) or less.
2 . The titanium porous body according to claim 1 , wherein the titanium porous body has a porosity of 30% or more and 50% or less.
3 . The titanium porous body according to claim 1 , wherein the titanium porous body has a titanium content of 97% by mass or more.
4 . The titanium porous body according to claim 1 , wherein the titanium porous body has a carbon content of 0.01% by mass or more and 0.06% by mass or less.
5 . A method for producing the titanium porous body in a form of a sheet according to claim 1 , the method comprising:
a drying step of drying a paste applied onto a substrate by heating the paste on the substrate at a temperature of 100° C. or more and 130° C. or less to obtain a molded body in a form of a sheet, the paste containing titanium powder, an organic binder, and an organic solvent, the titanium powder being a pulverized powder having a hydrogen content of 0.1% by mass or less, the paste being free of water or a foaming agent;
a preheating step of heating the molded body to volatilize organic substances in the molded body; and
a sintering step of heating the molded body after the preheating step to sinter the titanium powder in the molded body.
6 . The method for producing a titanium porous body according to claim 5 , wherein the preheating step is carried out after separating the molded body obtained in the drying step from the substrate.
7 . The method for producing a titanium porous body according to claim 5 , wherein the titanium powder in the paste used in the drying step has a 10% particle size D10 of 5 μm or more and 15 μm or less, and a 90% particle size D90 of 15 μm or more and 25 μm or less.
8 . The method for producing a titanium porous body according to claim 5 , wherein the drying step uses, as the paste, a paste having a ratio (Ms/Mb) of a mass Ms of the organic solvent to a mass Mb of the organic binder of 2.0 or more and 9.0 or less.
9 . The method for producing a titanium porous body according to claim 5 , wherein the titanium powder is a hydride-dehydride titanium powder.
10 . The method for producing a titanium porous body according to claim 5 , wherein a ratio (Ms/Mb) of a mass Ms of the organic solvent to a mass Mb of the organic binder in the paste is 2.5 or more and 6.0 or less.
11 . The method for producing a titanium porous body according to claim 5 , wherein in the preheating step, the molded body is heated in an air atmosphere at a temperature of 300° C. or more and less than 450° C. for a period of time of 3 hours or more and 12 hours or less.
12 . The method for producing a titanium porous body according to claim 5 , wherein in the sintering step, the molded body is heated at a temperature of 700° C. or more and 850° C. or less for a period of time of 1 hour or more and 4 hours or less.
13 . The titanium porous body according to claim 1 , obtained by a method for producing a titanium porous body in a form of a sheet, the method comprising:
a drying step of drying a paste applied onto a substrate by heating the paste on the substrate at a temperature of 100° C. or more and 130° C. or less to obtain a molded body in a form of a sheet, the paste containing titanium powder, an organic binder, and an organic solvent, the titanium powder being a pulverized powder having a hydrogen content of 0.1% by mass or less, the paste being free of water or a foaming agent;
a preheating step of heating the molded body to volatilize organic substances in the molded body; and
a sintering step of heating the molded body after the preheating step to sinter the titanium powder in the molded body.
14 . The titanium porous body according to claim 13 , wherein the preheating step is carried out after separating the molded body obtained in the drying step from the substrate.
15 . The titanium porous body according to claim 13 , wherein the titanium powder in the paste used in the drying step has a 10% particle size D10 of 5 μm or more and 15 μm or less, and a 90% particle size D90 of 15 μm or more and 25 μm or less.
16 . The titanium porous body according to claim 13 , wherein the drying step uses, as the paste, a paste having a ratio (Ms/Mb) of a mass Ms of the organic solvent to a mass Mb of the organic binder of 2.0 or more and 9.0 or less.
17 . The titanium porous body according to claim 13 , wherein the titanium powder is a hydride-dehydride titanium powder.
18 . The titanium porous body according to claim 13 , wherein a ratio (Ms/Mb) of a mass Ms of the organic solvent to a mass Mb of the organic binder in the paste is 2.5 or more and 6.0 or less.
19 . The titanium porous body according to claim 13 , wherein in the preheating step, the molded body is heated in an air atmosphere at a temperature of 300° C. or more and less than 450° C. for a period of time of 3 hours or more and 12 hours or less.
20 . The titanium porous body according to claim 13 , wherein in the sintering step, the molded body is heated at a temperature of 700° C. or more and 850° C. or less for a period of time of 1 hour or more and 4 hours or less.