Composite element and method for preparation thereof

• US 6,878,450 B2
• Filed: 11/13/2001
• Issued: 04/12/2005
• Est. Priority Date: 11/24/2000
• Status: Expired due to Fees

• Current Assignee: Murakami Corporation
• Original Assignee: Murakami Corporation
• Inventors: Takeuchi, Masato, Anpo, Masakazu, Dohshi, Satoru, Kuzuya, Norihiko
• Primary Examiner(s): McNeil, Jennifer
• Assistant Examiner(s): Blackwell-Rudasill, G.
• Application Number:
  US10/181,982
• Publication Number:
  US 20030003292A1
• Time in Patent Office: 1,246 Days
• Field of Search: 428/432, 428/427, 428/433, 428/697, 428/701, 428/702, 502/202, 501/41, 501/49, 501/73, 501/77
• US Class Current: 428/427
• CPC Class Codes: B01J 21/02 Boron or aluminium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0238 via the gaseous phase-sublimation
• CPC Class Codes: B01J 37/347 Ionic or cathodic spraying; Electric discharge
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 2217/425 consisting of a porous layer
• CPC Class Codes: C03C 2217/45 Inorganic continuous phases
• CPC Class Codes: C03C 2217/477 Titanium oxide
• CPC Class Codes: C23C 14/08 Oxides C23C14/10 takes precedence
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/249987 With nonvoid component of specified composition

Abstract

This invention provides a composite device whereby surface reflection and interference colors can be inhibited, photocatalytic decomposition performance may be improved and hydrophilicity-acquiring rate may be improved. A mixture film (14) is deposited on the surface of a base (12). The mixture film (14) is a colorless and transparent mixture film with a high light transmittance made of a mixture of boron oxide and photocatalytic titanium oxide.

Claims

1. A composite device comprising a mixture film containing boron oxide and titanium oxide as main components on a surface of a base, wherein a content of boron oxide in said mixture film is 90% to 95% by weight.

2. The composite device according to claim 1 wherein the titanium oxide exists in the boron oxide in a particulate state in said mixture film.

3. The composite device according to claim 1 wherein said mixture film is placed on the top surface of the device.

4. The composite device according to claim 1 wherein a porous inorganic oxide film is provided on the surface of said mixture film.

5. The composite device according to claim 4 wherein at least a part of openings in said porous film is formed to reach said mixture film.

6. The composite device according to claim 1 wherein said base is a transparent substrate and a reflective film is deposited on the back surface of said transparent substrate.

7. The composite device according to claim 1 wherein an intermediate film is deposited between the surface of said base and said mixture film.

8. The composite device according to claim 1 wherein a reflective film is deposited as an intermediate film between the surface of said base and said mixture film.

9. A method for manufacturing a composite device, the method comprising

depositing a mixture film comprising boron oxide and titanium oxide as main components on a surface of a base by

placing a crucible containing titanium and a crucible containing boron oxide under a vacuum atmosphere in which a small amount of oxygen is introduced;

simultaneously evaporating the titanium and boron oxide in these crucibles to allow clusters of the materials to be emitted from the nozzles of the crucibles, respectively;

oxidizing the cluster of the titanium with said introduced oxygen to form a cluster of titanium oxide;

ionizing the clusters of titanium oxide and of boron oxide; and

accelerating the ionized clusters in an electric field to collide with the surface of the base; and

producing the composite device of claim 1.

10. The composite device according to claim 1, wherein the mixture film consists of the boron oxide and the titanium oxide.

11. A method of making a composite device, the method comprising

depositing boron oxide and titanium oxide on a base;

and

producing the composite device of claim 1.

12. The composite device according to claim 1, wherein a surface of said mixture film is made hydrophilic by irradiation with ultraviolet rays.

13. The composite device according to claim 1, wherein upon exposure to ultraviolet irradiation the mixture film containing boron oxide and titanium oxide has a hydrophilicity acquisition rate higher than that of a film containing only the titanium oxide.