US4295885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material and method for securing boron filaments to each other and to a substrate and cutting tools therefrom
Assignee: Lockheed Martin Corp
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Filing: 1978-09-11
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Granted: 1981-10-20
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Expires: 1998-09-11
Abstract
Abstract Material and method for securely attaching boron filaments to other like filaments and to a substrate with preservation of the filament integrity for cutting and abrading by coating them with a mixture of matrix metals essentially containing copper, tin and titanium and joining the filaments by the matrix metals and/or to the substrate into an integral structure by liquid-phase-sintering of the matrix metals which grip and adhere the filaments in a strong, tough alloy with the integrity of the filaments essentially preserved. Boron filament-containing tools for cutting, grinding, abrading, or the like may be fabricated using the materials of the invention and the methods disclosed.
Inventors
- 👤 William T. Kaarlela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:49
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/02; C22C47/04; B; B23; B23B; B23B27/00; B23B27/14; B23B27/18; B24; B24D; B24D18/00; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49801; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12167
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
167 words
A method of bonding of boron filaments to a substrate by a modified brazing which comprises: A. providing a substrate for receiving boron filaments to be bonded thereto; B. cleaning said substrate; C. providing boron filaments of a desired length; D. at least partially coating said filaments with a liquidized metals containing slip formulated from a metals mixture consisting essentially of from about 60% to about 75% by weight of copper, tin in an amount between about 20% to 35% by weight, the remainder being essentially titanium; E. said slip being further prepared from about 4 parts of the copper, tin and titanium mixture to about 1 part of about a 1/2% to about a 1% liquid solution of a suspension agent for holding said metals mixture in suspension in said solution; F. placing said at least partially coated filaments on said substrate; G. drying said coated filaments; H. bonding said coated filaments to said substrate by liquid-phase-sintering; and I. cooling said coated filaments on said substrate.
Claim 2
Independent Claim
167 words
A method of bonding of boron filaments to a substrate by a modified brazing which comprises: A. providing a substrate for receiving boron filaments to be bonded thereto; B. cleaning said substrate; C. providing boron filaments of a desired length; D. at least partially coating said filaments with a liquidized metals containing slip formulated from a metals mixture consisting essentially of from about 60% to about 75% by weight of copper, tin in an amount between about 20% to 35% by weight, the remainder being essentially titanium; E. said slip being further prepared from about 4 parts of the copper, tin and titanium mixture to about 1 part of about a 1/2% to about a 1% liquid solution of a suspension agent for holding said metals mixture in suspension in said solution; F. placing said at least partially coated filaments on said substrate; G. drying said coated filaments; H. bonding said coated filaments to said substrate by liquid-phase-sintering; and I. cooling said coated filaments on said substrate.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which said suspension agent is a hydro-colloid.
Claim 4
Dependent Claim
23 words
The method of claim 2 in which said solution is a water solution and said hydro-colloid is a sodium salt of alginic acid.
Claim 5
Dependent Claim
24 words
The method of claim 1 in which said filaments are spaced apart on said substrate by from about 0.003 inches to about 0.008 inches.
Claim 6
Dependent Claim
28 words
The method of claim 1 in which said at least partially coated filaments are dried in air for about 5 minutes on said substrate before liquid phase sintering.
Claim 7
Dependent Claim
35 words
The method of claim 1 in which said liquid phase sintering is conducted at about 1500 to about 1650 degrees Fahrenheit in an inert atmosphere for from about 2 to about 3 minutes total time.
Claim 8
Dependent Claim
15 words
The method of claim 1 in which said cooling is accomplished in a non-oxidizing atmosphere.
Claim 9
Dependent Claim
45 words
The method of claim 6 in which said liquid phase sintering is accomplished by bringing the temperature up to sintering temperature from ambient for about 1.5 minutes followed by holding said sintering temperature for about 1.5 minutes followed by reduction of the temperature to ambient.
Claim 10
Independent Claim
176 words
A method of bonding together a plurality of boron filaments to hold them fixed in an alloy metal matrix which comprises: A. providing boron filaments of a desired length; B. at least partially coating said filaments with a liquidized metals containing slip formulated from a metals mixture consisting essentially of from about 60% to about 75% by weight of copper, tin in an amount between about 20% to 35% by weight, the remainder being essentially titanium; C. said slip being further prepared from about 4 parts of the copper, tin and titanium mixture to about 1 part of about a 1/2% to about a 1% solution containing a suspension agent for holding said metals mixture in suspension in said solution; D. placing said at least partially coated filaments juxtaposed together in a group; E. drying said juxtaposed group of coated filaments to at least partially remove the liquid vehicle of said solution; F. bonding said coated filaments together by liquid-phase-sintering to alloy the metals mixture about the filaments; and G. cooling said filaments and said metals.
Claim 11
Independent Claim
176 words
A method of bonding together a plurality of boron filaments to hold them fixed in an alloy metal matrix which comprises: A. providing boron filaments of a desired length; B. at least partially coating said filaments with a liquidized metals containing slip formulated from a metals mixture consisting essentially of from about 60% to about 75% by weight of copper, tin in an amount between about 20% to 35% by weight, the remainder being essentially titanium; C. said slip being further prepared from about 4 parts of the copper, tin and titanium mixture to about 1 part of about a 1/2% to about a 1% solution containing a suspension agent for holding said metals mixture in suspension in said solution; D. placing said at least partially coated filaments juxtaposed together in a group; E. drying said juxtaposed group of coated filaments to at least partially remove the liquid vehicle of said solution; F. bonding said coated filaments together by liquid-phase-sintering to alloy the metals mixture about the filaments; and G. cooling said filaments and said metals.
Claim 12
Dependent Claim
13 words
The method of claim 9 in which said suspension agent is a hydro-colloid.
Claim 13
Dependent Claim
23 words
The method of claim 9 in which said solution is a water solution and said hydro-colloid is a sodium salt of alginic acid.
Claim 14
Dependent Claim
24 words
The method of claim 9 in which said filaments are spaced apart in said matrix by from about 0.003 inches to about 0.008 inches.
Claim 15
Dependent Claim
25 words
The method of claim 9 in which said at least partially coated filaments are dried in air for about 5 minutes before liquid phase sintering.
Claim 16
Dependent Claim
37 words
The method of claim 9 in which said liquid phase sintering is conducted at about 1500 degrees Fahrenheit to about 1650 degrees Fahrenheit in a non-oxidizing atmosphere for from about 2 to about 3 minutes total time.
Claim 17
Dependent Claim
15 words
The method of claim 9 in which said cooling is accomplished in a non-oxidizing atmosphere.
Claim 18
Dependent Claim
45 words
The method of claim 14 in which said liquid phase sintering is accomplished by bringing the temperature up to sintering temperature from ambient for about 1.5 minutes followed by holding said sintering temperature for about 1.5 minutes followed by reduction of the temperature to ambient.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |