Porous coatings
First Claim
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1. A porous coating applied onto a substrate, comprising:
- metallic particles comprising aluminum, magnesium and tin, wherein the aggregate amount of magnesium and tin is not greater than 15 wt %, based on the weight of the porous coating, and the balance is aluminum;
wherein the porous coating has an average particle diameter ranging from about 35 to about 55 μ
m;
a thickness ranging from about 300 to about 400 μ
m;
a median pore diameter ranging from about 7 to about 12 μ
m; and
an overall porosity ranging from about 40% to about 60% based on the overall volume of the coating.
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Abstract
A porous metallic coating is provided. The coating is characterized by a combination of optimized properties that improve coating performance, as measured by heat transfer efficiency. The porous coating has optimal ranges for properties such as porosity, particle size and thickness, and has particular applicability in boiling heat transfer applications as part of an air separations unit. The porous coatings are derived from slurry-based formulations that include a mixture of metallic particles, a binder and a solvent.
28 Citations
21 Claims
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1. A porous coating applied onto a substrate, comprising:
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metallic particles comprising aluminum, magnesium and tin, wherein the aggregate amount of magnesium and tin is not greater than 15 wt %, based on the weight of the porous coating, and the balance is aluminum; wherein the porous coating has an average particle diameter ranging from about 35 to about 55 μ
m;a thickness ranging from about 300 to about 400 μ
m;a median pore diameter ranging from about 7 to about 12 μ
m; andan overall porosity ranging from about 40% to about 60% based on the overall volume of the coating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A porous coating applied onto a substrate derived from a slurry formulation, said slurry formulation comprising:
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a mixture of metallic particles having a predetermined size range and shape to create an optimal pore size and optimal pore size distribution, said mixture of metallic particles comprising aluminum, magnesium and tin, wherein said magnesium ranges between about 0.04 to about 10 wt % based on a weight of the slurry and said tin is present in an amount of about 0.02 to about 5 wt % based on a weight of the slurry, and said aluminum ranges from about 40 to about 70 wt %, based on the weight of the slurry; an organic binder to bind the metallic particles, said organic binder selected from the group consisting of polyvinyl butyral (PVB), polyvinyl alcohol, cellulose, starch, and any combination thereof; and a solvent selected from the group consisting of water, ethanol and isopropanol (IPA). - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification