DE1621248A1 - Process for the production of an amorphous drilling carbon deposit - Google Patents

Description

PATENT LAWYERS

PATENTANWÄLTE LICHT, HANSMANN, HERRMANN 8 MDNCHEN 2 THERESIENSTRASSE 33

Dip! .-! Ng> MARTIN LICHT · Dr. REINHOLD SCHMIDT DTpl.-Wirtsch.-lng. AXEL HANSMANN Dipl.-Phys. S E B A S TIA N H E R R M A N N

Monks, July 27, 1967 Your Sign Our Sign

/ KG

GENERAL ELECTRIC COMPANY Schenectady 5, NX _O River Road 1,
V ,. St. A,

Process for the production of an amorphous drilling carbon

low rainfall

The present invention is an additional application to patent .... (g ^ 50 506 Vlb / 48b).

The invention relates to a further development for a process for producing amorphous boron carbon and in particular for a process at which amorphous boron-carbon precipitate at relatively low temperatures.

109852/0241

Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann 8 MDNCHEN 2, THERESIENSTRASSE 33 · Telephone: 292102 · Telegram address: Lipotli / Munich

Oppenau office: PATENT ADVOCATE DR. REINHOLD SCHMIDT

Amorphous boron-carbon deposits have very desirable mechanical properties, whether they are in the form of boron carbides or in lOrm non-stoichiometric mixtures of boron and Carbon are present. These materials are known for their extremely high tensile strength and even for their high modulus of elasticity “Known at very high temperatures. It should be mentioned that the word "amorphous" is not intended to encompass the full Indicate lack of crystalline structure in the precipitate; it should only be said that with currently known Methods such as X-ray diffraction do not Crystal structure can be demonstrated.

According to the invention, the improved method consists in heating a substrate material to a temperature in the range of 700 to 900 ° C under very low pressure while the substrate material is brought into contact with a gaseous mixture of acetylene and borohydride. According to the preferably illustrated embodiment of the present invention a thread-like substrate with a mixture of acetylenediborane and hydrogen at a temperature of about 850 ° C and at brought into contact with a pressure of about 5 mm of mercury.

The boron hydrides, which are the starting point for "the boron of the present invention may exist in a number of volatile borohydrides, although diborane by its

SAD ORIGiNAL

109852/0241

It is preferred by its own volatility, availability and low cost ". These materials are" at ordinary Temperatures relatively stable and are subject to the reaction temperature and pressure according to the present process a controlled decomposition. Although the particular process of decay or decomposition is unknown, it is likely to include several intermediates Higher molecular weight borohydrides during decay be shaped. This means that other boron hydrides instead or can be used in addition to or with the more well-known and more readily available diboranes.

Although amorphous boron carbon precipitates can be achieved at low pressure by precipitating a mixture, which consists only of a borohydride and acetylene, hydrogen is usually contained in the reacting gas mixture. The hell of hydrogen is two-part. First the hydrogen supports the reduction to boron carbides and, in addition, hydrogen makes the occurrence more harmful Side reactions avoided.

The effectiveness of the present invention for manufacture of boron carbon precipitates in the temperature range below 1000 ° C is an essential factor of the described Procedure. Through the process the production of

BATH

1098 52/0241

amorphous boron carbon deposits on many substrates or non-carriers, which are subject to considerable physical or chemical changes at temperatures of over 1000 ° C . which can be observed in this temperature range, a loss of extensibility .BS are also substrates \ or ₀ substrate as SiIiciumoxyd and G-las which -. '''over half of 1000 G subject to decay The latter substrates are particularly suitable. Suitable for the production of low-density boron carbon threads. These threads, if they are produced according to the invention by depositing amorphous boron carbon on a thread-like substrate made of silicon oxide or "CKLaB, have excellent stress behavior as a reinforcing component. '■■, "'

. '"-. The quality of these products was determined by visual' observation as well as by! X-ray and microscopic analyzes determined, whereby it was found that the ISFi ed killed proportionally were smooth, amorphous and free of impurities *

One subject was a method of the present invention Tungsten filament with a diameter of 0.02 mm axially in one horizontally arranged, cylindrical reaction vessel of 5 cm length and 2 cm inside diameter.

1 0 985 2 / .02 41

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vascular was having electrical contacts · ausgestattei :, to-the thread in the vessel by resistance heating to erwärmenj _in: vessel "was located eb enf alls '' a © device of a high vacuum and a -xiXearißp ^ impurities.. The React ^ vessel also had inlets and outlets for: Reacting @jisie flowing vertically perpendicular to the reactor and a distributor "or" Eeitkör | ier for ~~ "for the reacting G-a's. This distributor stood. from a seated partition between the gas inlets and the / thread in the reactor, in order to direct the reaction gas into the tree immediately surrounding the thread. At a pressure reduced to 5 mm of mercury-absolute, the temperature of the substrate was raised to around 850 ° C by resistance heating. 3in, mixture of hydrogen at a rate of 2.0 I übikzentimetempro _minute: Diborany at a rate of 120 cubic centimeters per minute and acetylene with "a ^^ rate of 30 cubic centimeters per minute was passed ^ Reäktionsgefäss In this case, an amorphous bildjste. Boron carbon precipitation at a rate of increase in diameter of about 0.025 mm per hour.

The product thus made was ^ hard and pointed No determinable crystal structure under X-ray analysis on. To prove »that the Eiedörschlag is not made of pure Boron passed * an attempt was made to: the precipitation with 50 ^ igem; hydrogen per ^

98 52/0 24 t - ;; C ^; _BmomG mp £ "

no etching process "was observed, proving that the Precipitation consisted not only of boron. Since with this Experiment could not be expected that carbon will precipitate at the low temperature, so was it unlikely that the rainfall consists solely of carbon It was concluded that the one after the experiment produced precipitate consisted of amorphous boron carbon. Part of the precipitate could consist of boron carbide, but this could not be proven. '·

In adapting to the present invention, an endless length of a thread coated with boron carbon can be produced by making a thread endless or indefinite length is passed through a reaction vessel of the type described above »This thread is then continuously heated and brought into contact with the gaseous reaction mixture, ' when this flows through the reaction vessel.

Ö93 527 02Ä1

Claims (1)

P A T E N T A N WÄ LT E PATENTANWÄLTE LICHT, HANSMANN, HERRMANN 8 MÖNCHEN 2 THERESIENSTRASSE 33 G-MEHAL ELECTEIC COMPANr Schenectady 5, U. Y, Hiver Eoad 1, _ ".
V. St. -A. · DSpL-IrIgZMARTINIiCHT Dr. RE I NH OLD SCHM j DT ~ DipMMrtidi.4ng '. ~ AXEL H ANSMAN N Drp | ..Phys. SEBASTIAN HERRMAN N Möndia, July 27, 1967 Your sign .' Our sign - Patent application: process for the production of an amorphous. Carboniferous precipitate ': -. "■■ _: P A TE N T AFS FHTJ C H E \. Process for the production of an amorphous Iorocarbon material precipitate according to patent ".. * ♦ (& 50 505ViV ^ OIi), characterized in that the substrate material is brought into contact with a gaseous mixture of acetylene and borohydride. _:; ^: ; . 2 * Method according to claim 1, characterized in that
that the mind also contains hydrogen. * 3. The method according to claim 1 or 2, characterized in that that the borhyarid is diborane. 1 038S2 / 0241 ORIGINAL BATHROOM Patent attorneys Dipl.-Ing. Martin Licht, Dipl.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys «Sebastian Herrmann 8 MÖNCHEN 2, THERESiENSTRASSE 33« TelefonlÄ21 «2 ■■" · Telägramm-Adresses LipdHi / MOnchen Bank details: Deutsche Bank AG, FilialeLMOpchen, Dep.-Kassen VJkfualienniarkt KbntorNr. 70 / 30i38 Bayer. Association bank Mönchen, Zwefgsf. Oskär-YOh-MiUer-iiinö, Ktp-Nr, 8824515 · PosfscheckrKontÖ! Munich No. 163397 OppenauerBOroi PATfKTÄNWALf'öRrREIHHÖLD SCHMJDT _: 4. The method according to claim 3, characterized in that that the mixture is three parts by volume of acetylene, two parts by volume Contains hydrogen and twelve parts by volume of diborane. 5. The method according to claim 3 or 4 * characterized in that ■ that the reaction chamber up. on the one hand bridge in the area of ■ about 5 mm of mercury is evacuated, 6. The method of claim 3 ~ or 4, characterized in that that the substrate material is heated up to about 850 ° 0. 7. The method according to any one of the preceding claims, characterized in that the substrate material consists of a continuous thread. 8. The method according to claim 7, characterized in that that the process is continuous on a substrate material indefinite length is applied, which through a vacuum chamber is passed through after the chamber has been evacuated and that the gas is also continuously flowing through the vacuum chamber is passed through, 9. The method na0h claim 7, characterized in that the substrate consists of filiform silicon oxide. 109852/0241 -. # · - : ■■■■■ "■■■■■" ■ 10. Procedure according to Änsprue h 7, thereby g eteennz ei without t, that the substrate is filamentary glass. 109852/0241 bathroom