Method for the production of homogeneous coatings of two or more metals and/or metal compounds
First Claim
1. A method for the production of homogeneous coatings of a substance comprising at least two components selected from metals and metal compounds on a substrate comprising depositing said substance from a liquid phase from dinuclear or polynuclear mixed metal compounds by heating said dinuclear or polynuclear compounds to a first temperature about 85-90% of a final temperature over a period of about 5 to about 20 minutes, then heating at a second temperature about 62 to about 72% of said final temperature for about 11/2 to about 21/2 hours, then raising the temperature to the final temperature over about 20 to about 40 minutes and maintaining the final temperature for about 1 to about 2 hours, whereby said coating exhibits optical properties of at least 0.70 absorption and no greater than 0.30 emission.
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Abstract
A method for the production of homogeneous coatings of a substance comprising at least two metals and/or metal compounds on a substrate, which method comprises depositing the substance from a gas or liquid phase from dinuclear or polynuclear mixed metal compounds via a four step process comprising heating the substance to 85-90% of a final temperature over a period of 5 to 20 minutes, reducing the temperature to a second temperature which is 2/3 of said final temperature, maintaining the second temperature for 11/2 to 21/2 hours, raising the second temperature over a period of 20 to 40 minutes, and maintaining the final temperature for 1 to 2 hours. The coated materials are, for example, useful for coating solar collectors with an α of at least 0.70 and an ε no greater than 0.30.
81 Citations
17 Claims
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1. A method for the production of homogeneous coatings of a substance comprising at least two components selected from metals and metal compounds on a substrate comprising depositing said substance from a liquid phase from dinuclear or polynuclear mixed metal compounds by heating said dinuclear or polynuclear compounds to a first temperature about 85-90% of a final temperature over a period of about 5 to about 20 minutes, then heating at a second temperature about 62 to about 72% of said final temperature for about 11/2 to about 21/2 hours, then raising the temperature to the final temperature over about 20 to about 40 minutes and maintaining the final temperature for about 1 to about 2 hours, whereby said coating exhibits optical properties of at least 0.70 absorption and no greater than 0.30 emission.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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11. The method of claim 1 wherein said coating is deposited by pyrolysis of said compound dissolved or suspended in a liquid.
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12. The method of claim 1 wherein the ratio of one of said metals to the other is from about 2:
- 1 to 1;
2.
- 1 to 1;
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13. The method of claim 1 wherein depositing takes place in a reducing, oxidizing, or inert atmosphere.
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14. The method of claim 13 wherein said atmosphere is an oxidizing atmosphere.
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15. The method of claim 14 wherein said atmosphere comprises oxygen.
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16. The method of claim 1 wherein said final temperature is 350°
- C. for compounds which begin decomposition at and below 300°
C.
- C. for compounds which begin decomposition at and below 300°
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17. The method of claim 1 wherein said final temperature is 50°
- C. above the temperature at which decomposition begins for compounds which begin decomposition above 300°
C.
- C. above the temperature at which decomposition begins for compounds which begin decomposition above 300°
Specification