DE1960973C3 - Process for improving the mechanical properties of objects with a boron deposit deposited on a metal core - Google Patents
Process for improving the mechanical properties of objects with a boron deposit deposited on a metal coreInfo
- Publication number
- DE1960973C3 DE1960973C3 DE1960973A DE1960973A DE1960973C3 DE 1960973 C3 DE1960973 C3 DE 1960973C3 DE 1960973 A DE1960973 A DE 1960973A DE 1960973 A DE1960973 A DE 1960973A DE 1960973 C3 DE1960973 C3 DE 1960973C3
- Authority
- DE
- Germany
- Prior art keywords
- objects
- mechanical properties
- improving
- boron
- metal core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- ing And Chemical Polishing (AREA)
- Inorganic Fibers (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Verbesserung der mechanischen Eigenschaften von Gegenständen mit einem auf einem Metallkern, insbesondere einem Wolframkern aufgebrachten, fest haftenden Borniederschlag. The invention relates to a method for improving the mechanical properties of objects with a firmly adhering boron deposit applied to a metal core, in particular a tungsten core.
Es ist bekannt, bestimmte Gegenstände, insbesondere langgestreckte Gegenstände in Band-, Faden- oder Faserform im Wege eines Niederschlagverfahrens auf einer entsprechend erhitzten metallischen Unterschicht mit einer Borschicht zu beschichten. Ein solches Verfahren besteht beispielsweise darin, daß auf dieser Unterschicht der Zerfall eines gasförmigen Gemisches herbeigeführt wird, welches aus einer Borverbindung, beispielsweise Botrrichlorid und Wasserstoff besteht.It is known to use certain objects, especially elongated objects in tape, thread or Fiber shape by means of a precipitation process on a suitably heated metallic sub-layer to be coated with a boron layer. One such method is, for example, that on this sublayer the decomposition of a gaseous mixture is brought about, which consists of a boron compound, for example, Botrrichlorid and hydrogen.
Nach der Erfindung wird eine Verbesserung der mechanischen Eigenschaften der Gegenstände dadurch erzielt, daß sie unter anodischer Schaltung durch ein saures wäßriges Bad hindurchgeleitet werden, welches Wasserstoffperoxid enthält. Die Gegenelektrode ist eine vorzugsweise rohrförmig ausgebildete Metallkathode. According to the invention, an improvement in the mechanical properties of the objects is achieved by that they are passed with anodic switching through an acidic aqueous bath, which Contains hydrogen peroxide. The counter electrode is a preferably tubular metal cathode.
Vorzugsweise finden in Verbindung mit dem erfindungsgemäßen Verfahren solche Materialien Verwendung, deren Kern aus Wolfram besteht und deren Borschicht mindestens so dick ist, daß der Wolframkern insgesamt in ein Borwolframmetall umgewandelt wird, das sich durch besonders gute mechanische Eigenschaften auszeichnet.Such materials are preferably used in connection with the method according to the invention, whose core consists of tungsten and whose boron layer is at least as thick as the tungsten core overall is converted into a boron tungsten metal, which is characterized by particularly good mechanical properties excels.
Das erfindungsgemäße Verfahren läßt sich kontinuierlich oder diskontinuierlich durchführen. Der zu behandelnde Gegenstand durchläuft hierbei zunächst einmal entsprechende Vorbereitungsbäder, beispielsweise ein Lösungsmittel (Trichloräthylen) und einen Alkohol, beispielsweise einen Äthylalkohol. Anschließend wird der Gegenstand in das Elektrolysebad eingeführt. Schließlich gelangt er von dort aus in die entsprechenden Endbearbeitungsbäder, beispielsweise in Alkoholbäder (Methylalkohol) und Aceton.The process according to the invention can be carried out continuously or batchwise. The one to be treated The object first goes through appropriate preparatory baths, for example a solvent (trichlorethylene) and an alcohol, for example an ethyl alcohol. Then will the object is introduced into the electrolytic bath. Finally, from there he gets into the appropriate Finishing baths such as alcohol (methyl alcohol) and acetone baths.
Das Elektrolysebad enthält auf 500 cm3 Wasser etwa 20 bis 60 cm3 einer Wasserstoffsuperoxidlösung solcher Konzentration, daß aus einem Liter Lösung 110 Liter Sauerstoff freigemacht werden — was einer Konzentration von 33 Gewichtsprozent entspricht — und eine geringfügige Menge (beispielsweise 1 cm3) eines sauren Elektrolyten, bei dem es sich um eine Mineralsäure, beispielsweise Schwefelsäure oder Salpetersäure handeln kann. Dabei sind Stromdichte (beispielsweise 0,5 A/dm2 bis 5 A/dm2) und Behandlungszeit (beispielsweise 1 bis 10 Min.) jeweils derart zu wählen, daß es an der Anode zu einer Borablösung in einer Dicke von weniger als etwa 5 μ kommt.The electrolysis bath contains about 20 to 60 cm 3 of a hydrogen peroxide solution per 500 cm 3 of water in such a concentration that 110 liters of oxygen are released from one liter of solution - which corresponds to a concentration of 33 percent by weight - and a small amount (for example 1 cm 3 ) of an acidic one Electrolyte, which can be a mineral acid such as sulfuric acid or nitric acid. Current density (for example 0.5 A / dm 2 to 5 A / dm 2 ) and treatment time (for example 1 to 10 min.) Are to be chosen in each case in such a way that boron detachment at the anode is less than about 5 μ is coming.
Durch diese Behandlung werden die mechanischen Eigenschaften der Gegenstände in einem ganz erheblichen Maße verbessert. Bei Fasern mit einem Wolframkern wird die Zugfestigkeit im Schntt von 50 auf 70 kg/mm2 erhöht.This treatment improves the mechanical properties of the objects to a very considerable extent. In the case of fibers with a tungsten core, the tensile strength in the cut is increased from 50 to 70 kg / mm 2 .
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR176867 | 1968-12-05 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE1960973A1 DE1960973A1 (en) | 1970-06-25 |
| DE1960973B2 DE1960973B2 (en) | 1975-04-10 |
| DE1960973C3 true DE1960973C3 (en) | 1975-11-20 |
Family
ID=8657907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1960973A Expired DE1960973C3 (en) | 1968-12-05 | 1969-12-04 | Process for improving the mechanical properties of objects with a boron deposit deposited on a metal core |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3694333A (en) |
| DE (1) | DE1960973C3 (en) |
| FR (1) | FR1598322A (en) |
| GB (1) | GB1235779A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4261804A (en) * | 1979-11-13 | 1981-04-14 | United Technologies Corporation | Selective removal of nickel-based alloys from ferrous-based metals |
| US4324626A (en) * | 1979-11-13 | 1982-04-13 | United Technologies Corporation | Selective removal of nickel-based braze alloy from nickel-based metals |
-
1968
- 1968-12-05 FR FR176867A patent/FR1598322A/fr not_active Expired
-
1969
- 1969-12-03 GB GB59022/69A patent/GB1235779A/en not_active Expired
- 1969-12-04 DE DE1960973A patent/DE1960973C3/en not_active Expired
-
1971
- 1971-11-18 US US200144A patent/US3694333A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE1960973A1 (en) | 1970-06-25 |
| FR1598322A (en) | 1970-07-06 |
| US3694333A (en) | 1972-09-26 |
| DE1960973B2 (en) | 1975-04-10 |
| GB1235779A (en) | 1971-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| 8339 | Ceased/non-payment of the annual fee |