Porous metallic layer and formation

• US 4,064,914 A
• Filed: 11/23/1976
• Issued: 12/27/1977
• Est. Priority Date: 05/08/1974
• Status: Expired due to Term

• Current Assignee: UOP Des Plaines IL A NY General Partnership
• Original Assignee: Union Carbide Corporation (Dow, Inc.)
• Inventors: Grant, Andrew Campbell
• Primary Examiner(s): Aegerter, Richard E.
• Assistant Examiner(s): Stearns, Richard R.
• Application Number:
  US05/744,416
• Time in Patent Office: 399 Days
• Field of Search: 165/133, 165/177, 165/180, 165/DIG. 10, 138/142, 138/143, 138/177, 138/DIG. 4, 138/145, 138/146
• US Class Current: 138/142
• CPC Class Codes: B22F 7/002 of porous nature
• CPC Class Codes: C23C 24/106 Coating with metal alloys or metal elements only
• CPC Class Codes: F28F 13/187 especially adapted for evaporator surfaces or condenser surfaces, e.g. with nucleation sites
• CPC Class Codes: Y10S 165/907 Porous

Abstract

A metallic porous layer is formed on copper or copper alloy base material by providing a loose coating of copper or steel powder matrix, bonding metal alloy consisting of copper and phosphorous, or copper and antimony and a liquid binder, partially heating to evolve the liquid binder and further heating to 1350°-1550° F. to braze the bonding metal alloy to the base material and matrix.

Claims

1. As an article of manufacture, a copper base material tube of grain size below approximately 0.05 mm. and a porous layer less than 0.125 inch thick on at least one surface of said tube comprising metal particles wherein said particles are of a material selected from the group consisting of copper, copper alloy and steel of 30-500 mesh size in random stacked relation as a uniform structure with interstitial and inteconnected pores between adjacent particles having equivalent pore radii of below approximately 7.5 mils, said particles being brazed together and to the tube surface by a bonding metal alloy consisting of approximately 56% silver, 22% copper, 17% zinc, and 5% tin by weight, having a melting point below 1500°

F.

2. As an article of manufacture, a copper base material tube of grain size below approximately 0.05 mm. and a porous layer less than 0.125 inch thick on at least one surface of said tube comprising metal particles wherein said particles are of a material selected from the group consisting of copper, copper alloy and steel of 30-500 mesh size in random stacked relation as a uniform structure with interstitial and interconnected pores between adjacent particles having equivalent pore radii of below approximately 7.5 mils, said particles being brazed together and to the tube surface by a bonding metal alloy consisting of 25-95 weight % antimony, 5-75 weight % copper, comprising 10-30 weight % of the metal particle - metal alloy total and having a melting point below 1500°

F.