US3861953A - Node-free boron composite filament - Google Patents
Node-free boron composite filament Download PDFInfo
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- US3861953A US3861953A US263491A US26349172A US3861953A US 3861953 A US3861953 A US 3861953A US 263491 A US263491 A US 263491A US 26349172 A US26349172 A US 26349172A US 3861953 A US3861953 A US 3861953A
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- boron
- carbon
- coating
- node
- consisting essentially
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 36
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 13
- 239000010439 graphite Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 21
- 239000000835 fiber Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 13
- 238000000151 deposition Methods 0.000 description 11
- 230000008021 deposition Effects 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 9
- 239000000376 reactant Substances 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- PPWPWBNSKBDSPK-UHFFFAOYSA-N [B].[C] Chemical compound [B].[C] PPWPWBNSKBDSPK-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- -1 boron halide Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 229910001750 ruby Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/10—Chemical after-treatment of artificial filaments or the like during manufacture of carbon
- D01F11/12—Chemical after-treatment of artificial filaments or the like during manufacture of carbon with inorganic substances ; Intercalation
- D01F11/124—Boron, borides, boron nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2916—Rod, strand, filament or fiber including boron or compound thereof [not as steel]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2918—Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2918—Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
- Y10T428/292—In coating or impregnation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/298—Physical dimension
Definitions
- filamentary boron may be produced by pyrolytic techniques in a process wherein the boron is chemically deposited on a resistively heated carbon monofilament which is exposed to a reactant gas consisting of boron trichloride admixed with hydrogen.
- the restricted concentration of methane in the reactant gas mixture is designed to prevent nodules from forming from too high a concentration and to prevent the formation of soot.
- the reactant gas mixture also includes a diluent gas such as nitrogen, hydrogen or one of the inert gases. Argon, in an amount of 50 to 90 mol% has been particularly useful.
- a preferred ratio in the reactant gas mixture is 20 mol% methane and 80 mol% argon.
- those conditions suitable for effecting pyrolytic boron deposition may also be used.
- the graphite-coated carbon substrate may be resistively heated to a temperature in the range of 700 to 1,400C, preferably 1,l00 to 1,300C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Vapour Deposition (AREA)
- Inorganic Fibers (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
A node-free boron composite filament comprising a filamentary substrate consisting essentially of carbon, a first coating on the substrate consisting essentially of pyrolytic graphite; and second coating consisting essentially of boron, the boron being continuous, of a thickness greater than 0.6 mil and of substantially constant diameter.
Description
United States Patent Basche et a1.
[4 1 Jan. 21, 1975 NODE-FREE BORON COMPOSITE FILAMENT Inventors: Malcolm Basche, West Hartford,
Conn.;Roy Fanti, Springfield, Mass; Francis S. Galasso, Manchester; Urban E. Kuntz, Hartford; Richard D. Schile, Wethersfield, all of Conn.
United Aircraft Corporation, East Hartford, Conn.
Filed: June 16, 1972 Appl. No.: 263,491
Related U.S. Application Data Division of Ser, No. 811,072, March 27, 1969, Pat. No. 3,679,475.
Assignee:
[56] References Cited UNITED STATES PATENTS 3,367,826 2/1968 Hcestand et a1. 117/46 CG. 3,369,920 2/1968 Bourdeau 117/46 CG. 3,409,469 11/1968 Kuntz ll7/D1G. 10 3,464,843 9/1969 Basche 117/46 CG. 3,479,205 11/1969 Morelock 117/46 CG. 3,537,877 11/1970 Reeves et a1 ll7/DlG 10 3,549,424 12/1970 Rice ll7/D1G, 10 3,565,683 2/1971 Morelock 117/D1G. 10 3,668,006 6/1972 Higgins et a1. l17/D1G. 10
Primary Examiner-Michael Sofocleous Attorney, Agent, or Firm-John D. Del Ponti [57] ABSTRACT A node-free boron composite filament comprising a filamentary substrate consisting essentially of carbon, a first coating on the substrate consisting essentially of pyrolytic graphite; and second coating consisting essentially of boron, the boron being continuous, of a thickness greater than 0.6 mil and of substantially constant diameter.
2 Claims, 1 Drawing Figure Zf jg. s 4% Z A Zi y 46 I NODE-FREE BORON COMPOSITE FILAMENT This is a division of application Ser. No. 811,072 filed Mar. 27, 1969, now US. Pat. No. 3,679,475.
BACKGROUND OF THE INVENTION This invention relates generally to a method for producing boron fiber and more particularly relates to a method for continuously depositing a relatively thick, substantially constant diameter boron coating on a carbon filament.
It is known that filamentary boron may be produced by pyrolytic techniques in a process wherein the boron is chemically deposited on a resistively heated carbon monofilament which is exposed to a reactant gas consisting of boron trichloride admixed with hydrogen.
The use of carbon as a filamentary substrate for boron has been recognized as offering the potential of significant improvements in the field of composite materials. Carbon, which in the present disclosure also includes graphitic material, possesses desirable characteristics in the form of electrical conductivity, hot strength, apparent chemical compatibility with boron, low density and an attractive cost feasibility relative to presently used tungsten filamentary substrates. Although the potential of carbon as a substrate is thus recognized, realization of this potential has been limited by the degradation of the carbon fiber during the coating process. It has been observed that, although the deposition of boron on the carbon substrate can be initiated uniformly, the coating quickly takes on a bamboo-like appearance with periodic nodes of boron thickened circumferentially along the fiber. The areas of increased deposition are caused by the appearance of a plurality of hot spots along the fiber and subsequent tests have revealed that the hot spots are caused by fractures in the carbon core which produce an irreversible change in the electrical properties of the fiber. It was found that the fractures occur irrespective of whether the process be static or continuous and with the fiber at a uniform temperature. Further investigations have indicated that the substrate fracturing is attributable to an unexpected growth phenomenon. As the boron is deposited on the carbon it undergoes a period of expansion which, when unchecked, exceeds the strength of the carbon filament and causes fracturing thereof. The exact cause and nature of this phenomenon is imperfectly understood at this time.
Recently, several techniques have been developed to improve the effectiveness of the basic continuous process through the close control of process conditions. In one of these methods, a continuous coating of nodefree amorphous boron is achieved by carefully limiting resident exposure of the carbon substrate in the reactor to a time period shorter than that at which fracturing occurs. At present however, the thickness of node-free boron which can be deposited on a one mil carbon filament by this technique is limited to a maximum of 0.6 mil to give a composite fiber of 2.2 mils.
SUMMARY OF THE INVENTION The present invention relates to the production of relatively large, constant diameter composite fibers, approximating 4 mils, in an improved process wherein filamentary carbon is modified through pretreatment. The invention contemplates a process wherein a nonreactive structural barrier is provided between the carbon and the boron in the nature of an electrically conductive precoating of pyrolytic graphite. In one particular embodiment of the invention, the pyrolytic graphite is deposited in thin layers to provide for relative slippage, without fracture, between the inner carbon bonded layer and the outer boron bonded layer to prevent hot spotting and provide a technique wherein relatively thick node-free boron coatings are achieved in reproducible fashion.
BRIEF DESCRIPTION OF THE DRAWING In the detailed description which follows, it will be convenient to make reference to the drawing which shows, in cross sectional view, an elevation of a reactor usable in the practice of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawing, a reactor 10 is shown and described below. It is to be understood, however, that although a single reactor is shown which is suitable for both carbon and boron deposition, a plurality of such reactors are preferably disposed, in sequence, in the practice of the present invention. The reactor 10 comprises a tubular containment vessel 12 having dual gas inlets 14, 16 at the upper end and dual gas outlets or exhaust ports 18, 20 at the lower end thereof. During the deposition of pyrolytic graphite, the inlets I4 and 16 are utilized as a feed for a reactant gas mixture comprising a diluent gas, as for example the inert gas argon, and a carbon-containing gas such as methane. During the boron deposition, the inlets 14 and 16 are utilized as the feed for a reactant gas mixture comprising a boron halide and hydrogen. The containment vessel is typically formed of quartz or Pyrex, although a wide variety of other dielectrics and glasses are suitable. The gas inlet 16 and outlet 20 penetrate and are electrically connected to the metallic end plugs 24 and 26 which provide the end closures for the containment vessel and also, provide a convenient means through which the power may be supplied to the wire for resistance heating purposes.
The end plugs 24 and 26 are respectively formed to provide a well 30 and 32 for containing a conductive sealant 34, such as mercury. The mercury serves the dual purpose of providing a gas seal around the wire where it penetrates the end plugs and further providing electrical contact between the wire and the end plugs, through the gas tubes 20 and 26, the leads 23 and 25, and the DC power source 36. The end plugs are further provided with an annular surface groove 38, which communicates with the mercury well 34 in the plugs through passageways 40 and 42, to provide sealing between the plug and the abutting wall of the containment vessel whereby gas is prevented from escaping from the reactor around the periphery of the plugs.
The respective plugs are further each formed with contrally oriented orifices, 44 and 46, which are large enough to permit free passage of the wire therethrough but which, in combination with the wire, are small enough to retain the mercury, through surface tension forces, in the respective wells. The end plugs can be modified to include an orificed ruby, tungsten or other suitable insert through which the wire passes and which provides the sealant retainment function previously mentioned.
In the process of the present invention, a plurality of reactors are serially disposed and a filamentary substrate 50 is drawn therethrough from a feed reel 52 to a take up reel 54 which maintain the wire under a slight tension as it passes through the orifice openings. Power from DC source 36 to the filament may be conveniently controlled by a resistor 56 although other means are suitable.
In carrying out the process wherein graphite is deposited on the carbon substrate in the reactor, conditions conventionally used for effecting pyrolytic deposition of graphite may be used. For example, the carbon filament substrate may be resistively heated to a temperature in the range of 1,600 to 2,100C, preferably 1,900 to 2,000C. Temperatures above 1,600C are needed to insure the formation of graphite rather than pure carbon. The reaction may be carried out at a pres- 1 sure of one atmosphere. A reactant gas which is introduced into the reactant chamber can be any carboncontaining gas suitable for depositing pure carbon in graphitic form. In particular, methane, in an amount 10 to 50 mol% has given satisfactory results. The restricted concentration of methane in the reactant gas mixture is designed to prevent nodules from forming from too high a concentration and to prevent the formation of soot. The reactant gas mixture also includes a diluent gas such as nitrogen, hydrogen or one of the inert gases. Argon, in an amount of 50 to 90 mol% has been particularly useful. A preferred ratio in the reactant gas mixture is 20 mol% methane and 80 mol% argon. Similarly, those conditions suitable for effecting pyrolytic boron deposition may also be used. For example, the graphite-coated carbon substrate may be resistively heated to a temperature in the range of 700 to 1,400C, preferably 1,l00 to 1,300C. The reaction may be carried out at a pressure of one atmosphere and the reactant gases may contain a boron containing gas (e.g., boron trichloride) in an amount of to 75 mol% and a reducing gas, preferably hydrogen, in an amount 85 to 25 mol%. A preferred ratio of gases is 40% boron trichloride and 60 mol% hydrogen.
During one investigation, a one mil carbon monofilament, from Great Lakes Carbon Corporation, having a clean surface substantially free of imperfection, a circular cross section and an electrical resistance between 500 to 2,500 ohms per inch, was coated with two layers of pyrolytic graphite prior to boron deposition. The monofilament was passed through two reactors such as described above, each having an effective length of 3% inches. In each reactor, the argon was provided at 800 cc/min. and the CH at 200 cc/min. with a wire speed of 150 ft./hr. A substantially constant current of 145 ma gave a substrate temperature of 1,900C. The original diameter ofthc filament was 1.05 mil and, after the first pyrographite coating, the diameter was 1.16 mils. After the second pyrographite coating, the diameter was 1.3 mils.
The pyrolytic graphite coated fiber was then passed through a boron reactor. The first boron layer was achieved with boron trichloride feed of 400 cc/min. and a hydrogen feed of 600 cc/min. with a fiber speed of 300 ft./hr. through the 3% inch reactor. The fiber temperature was approximately 1,200C and the diameter measured 2.11 mils. The second boron layer was accomplished with a boron trichloride feed of 400 cc./min. and a hydrogen feed of 600 cc./min. with a fiber speed of ft./hr. The fiber temperature was 1,170C during deposition and the diameter measured 2.9 mils. The third boron layer was achieved with a BCI feed of 400 cc./min. and a hydrogen feed of 600 cc./min. with a fiber speed of 150 ft./hr. The fiber temperature during this pass was maintained at about 1,200C. There were no hot spots and no breakage of the carbon monofilament and the diameter of the final composite filament was smooth and uniform and measured 3.73 mils constant within i 0.0003 inch.
By way of comparison, a boron-carbon fiber was produced without pyrographite precoatings on the carbon. A one mil carbon monofilament was run through the reactor at a speed of 230 ft./hr. and at a temperature of 1,170C with a BCl feed of 400 cc./min. and an H feed of 600 cc./min. The resulting composite exhibited the undesirable bamboo structure as previously discussed. The fiber had an average diameter of 3 mils with nodes as large as 4 mils in diameter which were spaced 7 to 10 mils apart.
What has been set forth above is intended primarily as exemplary to enable those skilled in the art in the practice of the invention and it should therefore be understood that, within the scope of the appended claims, the invention may be practiced in other ways than as specifically described.
What is claimed is:
1. A node-free composite filament for use in fabrication of fiber reinforced articles comprising:
a filamentary substrate consisting essentially of carbon;
a first coating on the substrate consisting essentially of pyrolytic graphite; and
a second coating thereover consisting essentially of boron, said boron coating being continuous, of a thickness greater than 0.6 mil and of substantially constant diameter.
2. The composite filament of claim 1 wherein said first coating is in the form of at least two layers.
l I l UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,861,953 DATED January 21, 1975 INVENTOR(S) I MALCOLM BASCHE ET AL it is certified that error appears in the ab0ve-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 2, line 59 "contrally" should read "centrally-'- Signed an sealed this 24th. day of June 1975.
(SEAL) fittest:
C. ZZARI'SE-LXLL DANN RUTH C. HA3 1? Commissioner of Patents Attasting Officer and Trademarks
Claims (2)
1. A NODE-FREE COMPOSITE FILAMENT FOR USE IN FABRICATION OF FIBER REINFORCED ARTICLES COMPRISING: A. FILAMENTARY SUBSTRATE CONSISTING ESSENTIALLY OF CARBON; A FIRST COATING ON THE SUBSTRATE CONSISTING ESSENTIALLY OF PYROLYTIC GRAPHITE; AND A SECOND COATING THEREOVER CONSISTING ESSENTIALLY OF BORON, SAID BORON COATING BEING CONTINUOUS, OF A THICKNESS GREATER THAN 0.6 MIL AND OF SUBSTANTIALLY CONSTANT DIAMETER.
2. The composite filament of claim 1 wherein said first coating is in the form of at least two layers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US263491A US3861953A (en) | 1969-03-27 | 1972-06-16 | Node-free boron composite filament |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US81107269A | 1969-03-27 | 1969-03-27 | |
US263491A US3861953A (en) | 1969-03-27 | 1972-06-16 | Node-free boron composite filament |
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US3861953A true US3861953A (en) | 1975-01-21 |
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Family Applications (1)
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US263491A Expired - Lifetime US3861953A (en) | 1969-03-27 | 1972-06-16 | Node-free boron composite filament |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4123583A (en) * | 1975-11-24 | 1978-10-31 | Avco Corporation | Filamentary reinforcement product |
US4142008A (en) * | 1972-03-01 | 1979-02-27 | Avco Corporation | Carbon filament coated with boron and method of making same |
US4433408A (en) * | 1977-09-20 | 1984-02-21 | Matsushita Electric Industrial Co., Ltd. | Cantilever for pickup cartridge |
DE3524082A1 (en) * | 1985-07-05 | 1987-01-08 | Bbc Brown Boveri & Cie | SUPRACTIVE FIBER AND METHOD FOR THE PRODUCTION THEREOF |
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US3367826A (en) * | 1964-05-01 | 1968-02-06 | Atomic Energy Commission Usa | Boron carbide article and method of making |
US3369920A (en) * | 1964-11-24 | 1968-02-20 | Union Carbide Corp | Process for producing coatings on carbon and graphite filaments |
US3409469A (en) * | 1964-03-05 | 1968-11-05 | United Aircraft Corp | Vapor coating conductive filaments utilizing uniform temperature |
US3464843A (en) * | 1962-03-21 | 1969-09-02 | Union Carbide Corp | Pyrolytic graphite alloys and method of making the same |
US3479205A (en) * | 1966-10-14 | 1969-11-18 | Gen Electric | Process for producing boron filament |
US3537877A (en) * | 1966-09-28 | 1970-11-03 | Gen Electric | Low temperature method for producing amorphous boron-carbon deposits |
US3549424A (en) * | 1967-02-24 | 1970-12-22 | United Aircraft Corp | Method for producing filamentary boron |
US3565683A (en) * | 1968-03-21 | 1971-02-23 | Gen Electric | Coated filaments |
US3668006A (en) * | 1969-06-02 | 1972-06-06 | Gen Electric | Formation of high-strength high-modulus coated filaments |
-
1972
- 1972-06-16 US US263491A patent/US3861953A/en not_active Expired - Lifetime
Patent Citations (9)
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---|---|---|---|---|
US3464843A (en) * | 1962-03-21 | 1969-09-02 | Union Carbide Corp | Pyrolytic graphite alloys and method of making the same |
US3409469A (en) * | 1964-03-05 | 1968-11-05 | United Aircraft Corp | Vapor coating conductive filaments utilizing uniform temperature |
US3367826A (en) * | 1964-05-01 | 1968-02-06 | Atomic Energy Commission Usa | Boron carbide article and method of making |
US3369920A (en) * | 1964-11-24 | 1968-02-20 | Union Carbide Corp | Process for producing coatings on carbon and graphite filaments |
US3537877A (en) * | 1966-09-28 | 1970-11-03 | Gen Electric | Low temperature method for producing amorphous boron-carbon deposits |
US3479205A (en) * | 1966-10-14 | 1969-11-18 | Gen Electric | Process for producing boron filament |
US3549424A (en) * | 1967-02-24 | 1970-12-22 | United Aircraft Corp | Method for producing filamentary boron |
US3565683A (en) * | 1968-03-21 | 1971-02-23 | Gen Electric | Coated filaments |
US3668006A (en) * | 1969-06-02 | 1972-06-06 | Gen Electric | Formation of high-strength high-modulus coated filaments |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4142008A (en) * | 1972-03-01 | 1979-02-27 | Avco Corporation | Carbon filament coated with boron and method of making same |
US4123583A (en) * | 1975-11-24 | 1978-10-31 | Avco Corporation | Filamentary reinforcement product |
US4433408A (en) * | 1977-09-20 | 1984-02-21 | Matsushita Electric Industrial Co., Ltd. | Cantilever for pickup cartridge |
DE3524082A1 (en) * | 1985-07-05 | 1987-01-08 | Bbc Brown Boveri & Cie | SUPRACTIVE FIBER AND METHOD FOR THE PRODUCTION THEREOF |
US4849288A (en) * | 1985-07-05 | 1989-07-18 | Brown, Boveri & Cie. Ag | Composite superconducting fiber |
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