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.degree. 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.degree. F.
BACKGROUND OF THE INVENTION
This is a continuation of application Ser. No. 467,936 filed May 8, 1974, now abandoned, which in turn is a division of application Ser. No. 074,131 filed Sept. 20, 1970, issued as U.S. Pat. No. 3,821,018, which in turn is a continuation-in-part of application Ser. No. 865,512 filed Oct. 10, 1969, now abandoned.
US Referenced Citations (6)
Divisions (1)
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Number |
Date |
Country |
Parent |
74131 |
Sep 1970 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
467936 |
May 1974 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
865512 |
Oct 1969 |
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