US5057335A
Expired / Lapsed
US
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Method for forming a ceramic coating by laser beam irradiation
Assignee: Dipsol Chemicals Co Ltd
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Filing: 1989-10-02
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Granted: 1991-10-15
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Expires: 2009-10-02
Abstract
Abstract A method for forming a ceramic coating on a substrate comprises immersing the substrate such as stainless steel in an aqueous solution containing a silicic acid compound such as sodium silicate and/or a metal salt of oxygen acid such as an aluminate, and irradiating the substrate with a laser beam. By this method, a dense and fine ceramic coating can be uniformly formed on the substrate without using an apparatus of large scale required in the gas phase method and without heating the system to a high temperature.
Inventors
- 👤 Haruo Hanagata
- 👤 Kathuhide Oshima
- 👤 Hidesato Igarashi
- 👤 Noboru Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:21
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/4505; C04B41/4535; C04B41/50; C04B41/5025; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C23; C23C; C23C18/00; C23C18/14; C23C18/143
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
A method for forming a ceramic coating on a substrate, which comprises immersing the substrate in an aqueous solution containing a soluble silicic acid compound, or a soluble metal salt of an oxyacid, or mixtures thereof and irradiating the substrate in the aqueous solution with a laser beam.
Claim 2
Independent Claim
48 words
A method for forming a ceramic coating on a substrate, which comprises immersing the substrate in an aqueous solution containing a soluble silicic acid compound, or a soluble metal salt of an oxyacid, or mixtures thereof and irradiating the substrate in the aqueous solution with a laser beam.
Claim 3
Dependent Claim
26 words
A method as set forth in claim 1 wherein the laser beam is a pulsed laser beam having a pulse width of 0.5 to 1.2 ms.
Claim 4
Dependent Claim
26 words
A method as set forth in claim 1 wherein the laser beam is a pulsed laser beam having a pulse width of 0.7 to 1.0 ms.
Claim 5
Dependent Claim
18 words
A method as set forth in claim 1 wherein the laser beam is a continuous oscillation laser beam.
Claim 6
Dependent Claim
32 words
A method as set forth in claim 1 wherein the aqueous solution contains a silicic acid compound and/or a metal salt of oxyacid in an amount of 0.1 to 90 weight %.
Claim 7
Dependent Claim
45 words
A method as set forth in claim 1 wherein the silicic acid compound is selected from the group consisting of water soluble or water dispersable compounds represented by the formula: M 2 O.nSiO 2 wherein M is alkali metal and n is 0.5 to 100.
Claim 8
Dependent Claim
29 words
A method as set forth in claim 1 wherein the silicic acid compound is selected from the group consisting of sodium silicate, sodium metasilicate, potassium silicate, and lithium silicate.
Claim 9
Dependent Claim
31 words
A method as set forth in claim 1 wherein the metal salt of oxyacid is selected from the group consisting of tungstates, stannates, molybdates, phosphates, vanadates, borates, chromates, aluminates and permanganates.
Claim 10
Dependent Claim
18 words
A method as set forth in claim 1 wherein pH of the aqueous solution is 4 to 14.
Claim 11
Dependent Claim
19 words
A method as set forth in claim 1 wherein the substrate is a metal substrate or a ceramic substrate.
Claim 12
Dependent Claim
29 words
A method as set forth in claim 1 wherein the substrate is selected from the group consisting of stainless steel, copper, iron, aluminum, silicon nitride and aluminum nitride substrate.
Claim 13
Dependent Claim
22 words
A method as set forth in claim 1 wherein the ceramic coating is formed in a thickness of 0.1 to 50 μm.
Claim 14
Dependent Claim
16 words
A method as set forth in claim 1 wherein the silicic acid compound is colloidal silica.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |