US3793705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for brazing a magnetic ceramic member to a metal member
Assignee: International Business Machines Corp
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Filing: 1972-12-11
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Granted: 1974-02-26
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Expires: 1992-12-11
Abstract
Abstract A strong, heat resistant, stress free joint is formed between nickel-zinc type ferrite ceramic and titanium by sputtering a thin chromium-containing metal layer on the ferrite joint site, and then brazing the metallized ferrite joint site to the titanium joint site by way of a silver-containing brazing alloy.
Inventors
- 👤 T Cole
- 👤 W Kehr
- 👤 J Wiitala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:11
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K1/00; B23K1/008; B23K1/19; B23K35/22; B23K35/24; B23K35/30; B23K35/3006; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/123; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/70; C04B2237/708; C04B2237/72; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
The method defined in claim 1 including the step of preheating the assembly for approximately one-half hour at a temperature of approximately 600* C.
Claim 2
Dependent Claim
30 words
The method defined in claim 1 wherein said sputtered metal is selected from the group 50 Cr-50 Ni by weight, 10 nickel-19 chromium-71 iron by weight, and other stainless steels.
Claim 3
Dependent Claim
32 words
The method defined in claim 1 wherein said brazing alloy is selected from the group 95 silver-5 aluminum by weight, 72 silver-28 copper by weight, and 71.5 silver-27.5 copper-1 nickel by weight.
Claim 4
Dependent Claim
56 words
The method defined in claim 2 wherein said sputtered metal is selected from the group 50 chromium-50 nickel by weight, 10 nickel-19 chromium-71 iron by weight, and stainless steel; and wherein said brazing alloy is selected from the group 95 silver-5 aluminum by weight, 72 silver-28 copper by weight, and 71.5 silver-27.5 copper-1 nickel by weight.
Claim 5
Dependent Claim
21 words
The method defined in claim 5 wherein the preheated assembly is heated to approximately 825* C for one to 2 minutes.
Claim 6
Dependent Claim
35 words
The method defined in claim 6 wherein the ceramic member is a nickel-zinc ferrite and wherein the head-housing is titanium or a titanium alloy having substantially the same coefficient of thermal expansion as said ferrite.
Claim 7
Dependent Claim
29 words
The method defined in claim 1 wherein the sputtered metal is 10 nickel-19 chromium-71 iron by weight, and wherein said brazing alloy is 71.5 silver-27.5 copper-1 nickel by weight.
Claim 8
Independent Claim
161 words
A method for brazing a magnetic ceramic to a nonmagnetic metal, comprising the steps of: a. cleaning both the ceramic and the metal joint sites, b. sputtering a thin layer of chromium-containing metal onto the ceramic joint site, said metal being selected to be at least partially soluble with a selected silver-containing brazing foil at a brazing temperature which is in the range of from 600* C to less than 1,000* C, c. mechanically supporting the ceramic and nonmagnetic metal joint sites with said selected silver-containing brazing foil intermediate thereto, said brazing foil being selected to wet both the ceramic''s sputtered layer of metal and the nonmagnetic metal, d. preheating the mechanically supported assembly in an inert environment at a temperature of approximately 600* C, and e. thereafter heating the assembly to a temperature in the range of from 600* to less than 1,000* C for a time period not exceeding 5 minutes to braze said ceramic to said nonmagnetic metal.
Claim 9
Dependent Claim
77 words
The method defined in claim 9 wherein said sputtered metal is selected from the group 50 chromium-50 nickel by weight, 10 nickel-19 chromium-71 iron by weight, and other stainless steels; wherein the sputtered layer thereof is approximately 10 micro inches thick, and not appreciably greater than 50 micro inches thick; and wherein said brazing material is selected from the group 95 silver-5 aluminum by weight, 72 silver-28 copper by weight, and 71.5 silver-27.5 copper-1 nickel by weight.
Claim 10
Dependent Claim
21 words
The method defined in claim 10 wherein the preheated assembly is heated to approximately 825* C for 1 to 2 minutes.
Claim 11
Dependent Claim
35 words
The method defined in claim 11 wherein the ceramic member is a nickel-zinc ferrite and the nonmagnetic metal is titanium or a titanium alloy having substantially the same coefficient of thermal expansion as said ferrite.
Claim 12
Dependent Claim
29 words
The method defined in claim 9 wherein the sputtered metal is 10 nickel-19 chromium-71 iron by weight, and wherein said brazing alloy is 71.5 silver-27.5 copper-1 nickel by weight.
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |