EP0189334A1
Expired / Lapsed
EP
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Surface preparation of nickel base alloys for brazing
Assignee: Avco Corp
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Filing: 1986-01-27
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Granted: —
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Expires: 2006-01-27
Abstract
Abstract In order to remove undesirable oxides from the surface of nickel-base or nickel-iron base alloys containing oxidizable aluminium and/or titanium prior to brazing, the alloy is heated in an oxygen containing atmosphere at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminium and a second layer beneath the first comprised of the alloy composition substantially depleted of aluminium and/or titanium. The surface of the alloy is cleaned to remove the first oxide layer whereupon the remaining surface is in condition for brazing.
Inventors
- 👤 Jule A. Miller
- 👤 Jack W. Lee
- 👤 Jeffrey Thyssen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 03:45
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/20; B23K1/206; B23K35/00; B23K35/001; B23K35/004; C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C23C8/12; C23G; C23G1/00; C23G1/14; C23G1/19; C23G1/28; C23G1/32; C25; C25F; C25F1/00; C25F1/02; C25F1/04; C25F1/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A method for preparing for brazing the surface of a nickel-base or nickel-iron base alloy containing at least one oxidizable metal selected from the group consisting of aluminium and titanium, the method comprising heating the alloy, prior to brazing, in an oxygen containing atmosphere at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminum and a second layer beneath the first comprised of the alloy composition substantially depleted of the oxidizable metal and then cleaning the surface of the alloy to remove the first oxide layer.
Claim 2
Independent Claim
106 words
A method for preparing for brazing the surface of a nickel-base or nickel-iron base alloy containing at least one oxidizable metal selected from the group consisting of aluminium and titanium, the method comprising heating the alloy, prior to brazing, in an oxygen containing atmosphere at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminum and a second layer beneath the first comprised of the alloy composition substantially depleted of the oxidizable metal and then cleaning the surface of the alloy to remove the first oxide layer.
Claim 3
Dependent Claim
13 words
A method according to claim 1, wherein the oxygen containing atmosphere is air.
Claim 4
Dependent Claim
24 words
A method according to claim 1 or 2, wherein the alloy is heated at a temperature of about 1750 to about 2200 o F.
Claim 5
Dependent Claim
45 words
A method according to claim 1, 2 or 3, wherein the first oxide layer is removed by immersion of the alloy in an aqueous alkaline solution containing at least one alkaline reagent selected from the group consisting of sodium hydroxide, potassium hydroxide and potassium permanganate.
Claim 6
Dependent Claim
48 words
A method according to claim 1, 2 or 3, wherein the first oxide layer is removed by immersion of the alloy in an electrolytic molten salt bath containing at least one alkaline reagent selected from the group consisting of sodium hydroxide, sodium chloride, sodium fluoride and sodium aiuminade.
Claim 7
Dependent Claim
74 words
A method according to claim 1, 2 or 3, wherein the first oxide layer is removed by immersion of the alloy in a nonelectrolytic molten salt bath containing at least one alkaline reagent selected from the group consisting of potassium hydroxide, sodium nitrate and potassium permanganate and then followed by immersion in an alkaline solution containing at least one alkaline reagent selected from the group consisting of sodium hydroxide, potassium hydroxide and potassium permanganate.
References Cited (Backward Citations)
US4317685A
Cited
DE3303458A1
Cited
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