US4059217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superalloy liquid interface diffusion bonding
Assignee: Rohr Inc
•
Filing: 1975-12-30
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Granted: 1977-11-22
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Expires: 1995-12-30
Abstract
Abstract A liquid interface diffusion process is provided where a thin deposit (from 1/2 to 4 mils) of nickel (and/or cobalt) having 4-12 weight percent boron is plated on the nickel or cobalt based alloy faying surfaces. In the case of honeycomb sandwich, the plating is applied to the edge of the core or on the facing sheets and the assembly held together in intimate contact and exposed to a temperature sufficient to cause the Ni-B eutectic to melt. At the eutectic temperature a liquid is formed which makes a metallurgical joint. Upon further time at temperature the boron is diffused into the substrate so that isothermal solidification occurs and the boron is diluted to a small concentration. Sufficient time is allowed (on the order of one or more hours) so that the melting point at the joint area is essentially the same as the substrate and the joint is comparable to a diffusion bond.
Inventors
- 👤 James R. Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:06
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/004; B23K20/00; B23K20/22; B23K20/233; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
145 words
A process for joining nickel and/or cobalt based on superalloys which comprises the steps of: a. providing and masking elements to be joined together, said elements being formed of material taken from the class consisting of nickel based and cobalt based alloys, b. simultaneously applying to the faying surface of at least one of said elements by plating directly thereon from a single chemical bath of a layer taken from the class consisting of nickel, cobalt and a combination thereof and from about 4 to about 12 weight percent boron, c. demasking said elements and holding the elements together at their faying surfaces with sufficient force to maintain contact at the faying surfaces, and d. heating the elements to a temperature in the range of 1950° to 2150° F for more than one hour to cause the deposit to melt and form a metallurgical joint.
Claim 2
Dependent Claim
145 words
A process for joining nickel and/or cobalt based on superalloys which comprises the steps of: a. providing and masking elements to be joined together, said elements being formed of material taken from the class consisting of nickel based and cobalt based alloys, b. simultaneously applying to the faying surface of at least one of said elements by plating directly thereon from a single chemical bath of a layer taken from the class consisting of nickel, cobalt and a combination thereof and from about 4 to about 12 weight percent boron, c. demasking said elements and holding the elements together at their faying surfaces with sufficient force to maintain contact at the faying surfaces, and d. heating the elements to a temperature in the range of 1950° to 2150° F for more than one hour to cause the deposit to melt and form a metallurgical joint.
Claim 3
Dependent Claim
17 words
A process as set forth in claim 1 wherein one of said elements is a honeycomb core.
Claim 4
Dependent Claim
18 words
A process as set forth in claim 2 wherein the applying in (b) is provided by electroless plating.
Claim 5
Dependent Claim
35 words
A process as set forth in claim 3 wherein said heating in step (d) is for a sufficient period whereby the melting temperature at the joint is substantially the same as the elements bonded together.
Claim 6
Dependent Claim
25 words
A process as set forth in claim 4 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 7
Dependent Claim
20 words
A process according to claim 5 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 8
Dependent Claim
19 words
A process as set forth in claim 5 wherein said deposit in (b) is on both of said elements.
Claim 9
Dependent Claim
20 words
A process according to claim 4 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 10
Dependent Claim
19 words
The process of claim 4 wherein the temperature corresponds to the solution annealing temperature specified for the particular material.
Claim 11
Dependent Claim
34 words
The process of claim 3 wherein a small direct current is applied to the elements for a period up to five minutes, the elements being relatively negative electrically at the beginning of step (b).
Claim 12
Dependent Claim
25 words
A process as set forth in claim 10 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 13
Dependent Claim
20 words
A process according to claim 11 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 14
Dependent Claim
19 words
A process as set forth in claim 11 wherein said deposit in (b) is on both of said elements.
Claim 15
Dependent Claim
20 words
A process according to claim 10 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 16
Dependent Claim
25 words
A process as set forth in claim 3 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmoshpere.
Claim 17
Dependent Claim
35 words
A process as set forth in claim 2 wherein said heating in step (d) is for a sufficient period whereby the melting temperature at the joint is substantially the same as the elements bonded together.
Claim 18
Dependent Claim
25 words
A process as set forth in claim 16 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 19
Dependent Claim
19 words
The process of claim 16 wherein the temperature corresponds to the solution annealing temperature specified for the particular material.
Claim 20
Dependent Claim
25 words
A process as set forth in claim 2 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 21
Dependent Claim
17 words
A process as set forth in claim 2 wherein said deposit is applied to the core edges.
Claim 22
Dependent Claim
18 words
A process as set forth in claim 1 wherein the applying in (b) is provided by electroless plating.
Claim 23
Dependent Claim
35 words
A process as set forth in claim 21 wherein said heating in step (d) is for a sufficient period whereby the melting temperature at the joint is substantially the same as the elements bonded together.
Claim 24
Dependent Claim
25 words
A process as set forth in claim 22 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 25
Dependent Claim
20 words
A process according to claim 23 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 26
Dependent Claim
19 words
A process as set forth in claim 23 wherein said deposit in (b) is on both of said elements.
Claim 27
Dependent Claim
20 words
A process according to claim 22 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 28
Dependent Claim
19 words
The process of claim 22 wherein the temperature corresponds to the solution annealing temperature specified for the particular material.
Claim 29
Dependent Claim
34 words
The process of claim 21 wherein a small direct current is applied to the elements for a period up to five minutes, the elements being relatively negative electrically at the beginning of step (b).
Claim 30
Dependent Claim
25 words
A process as set forth in claim 28 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 31
Dependent Claim
20 words
A process according to claim 29 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 32
Dependent Claim
19 words
A process as set forth in claim 29 wherein said deposit in (b) is on both of said elements.
Claim 33
Dependent Claim
20 words
A process according to claim 28 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
Claim 34
Dependent Claim
25 words
A process as set forth in claim 21 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 35
Dependent Claim
35 words
A process as set forth in claim 1 wherein said heating in step (d) is for a sufficient period whereby the melting temperature at the joint is substantially the same as the elements bonded together.
Claim 36
Dependent Claim
25 words
A process as set forth in claim 34 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 37
Dependent Claim
19 words
The process of claim 34 wherein the temperature corresponds to the solution annealing temperature specified for the particular material.
Claim 38
Dependent Claim
25 words
A process as set forth in claim 1 wherein step (d) is carried out in one of a substantial vacuum, helium, argon or hydrogen atmosphere.
Claim 39
Dependent Claim
20 words
A process according to claim 1 wherein the thickness of said deposit is from about 1/2 to about 4 mils.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |