DE728218C - Process to enrich the surface layer of objects made of iron or steel by diffusion in chromium and silicon at the same time - Google Patents
Process to enrich the surface layer of objects made of iron or steel by diffusion in chromium and silicon at the same timeInfo
- Publication number
- DE728218C DE728218C DEST52628D DEST052628D DE728218C DE 728218 C DE728218 C DE 728218C DE ST52628 D DEST52628 D DE ST52628D DE ST052628 D DEST052628 D DE ST052628D DE 728218 C DE728218 C DE 728218C
- Authority
- DE
- Germany
- Prior art keywords
- silicon
- chromium
- diffusion
- iron
- enrich
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
- C23C10/54—Diffusion of at least chromium
Description
Verfahren, die Oberflächenschicht von Gegenständen aus Eisen oder Stahl durch Diffusion gleichzeitig an Chrom und Silizium anzureichern Gegenstände aus Eisen oder Stahl lassen sich bei höherer Temperatur durch Diffusion in ihrer Oberflächenschicht an Chrom anreichern, beispielsweise dadurch, daß man sie. in Chromchloridsalz einpackt und längere Zeit auf Temperaturen oberhalb goo' C erhitzt. Man hat jauch schon festgestellt, daß beim Chromieren in einer Mischung aus Chrom-und Siliciumpulver das Silicium die Anwendung niedrigerer Chromierungstempexaturen ermöglicht.Process, the surface layer of objects made of iron or Objects to be enriched with chromium and silicon at the same time through diffusion of steel from iron or steel can be at higher temperature by diffusion in their Enrich the surface layer of chromium, for example by having it. in Chromium chloride salt and heated to temperatures above goo 'C for a long time. It has already been established that when chrome plating in a mixture of chrome and Silicon powder that enables silicon to use lower chromating temperatures.
Die Erfindung geht von der Erkenntnis aus, daß, wenn Chrom und Silicium beide auf gasförmigem Wege in die Oberfläche der Gegenstände diffundiert werden, die Diffusion nicht nur viel schneller und ,gleichmäßiger vonstatten ,geht, daß sie viehmehr jauch erheblich kräftiger wird und sich dann selbst Gegenstände einwandfrei chromieren lassen, die aus sonst nur schlecht chromierbaren Legierungen des Eisens höherer Kohlenstoffgehalte bestehen. Demnach ist Gegenstand der Erfindung ein Verfahren, die Oberfläche von Gegenständen aus Eisen oder Stahl durch Diffusion gleichzeitig an Chrom und Silicium dadurch ,anzureichern, daß die gereinigten Gegenstände in einem verschließbaren Behälter in ein über 5 % Silicium enthaltendes Gemisch aus Silicium, Ferrosilicium oder siliciumhaltigen Legierungen einerseits und Chromchlorid andererseits eingesetzt und in dem dann verschlossenen Behälter einige Stunden auf Temperaturen von 8oo bis iooo° C erhitzt werden. Mit dem Chromchlorid und dem Silicium zusammen können je nach den Eigenschaften, die die Diffusionsschicht besitzen soll, auch noch andere Metalle, so beispielsweise Molybdän, Wolfram oder Nickel, diffundiert werden.The invention is based on the knowledge that if chromium and silicon both are diffused into the surface of the objects in a gaseous way, Not only does the diffusion take place much faster and, more evenly, that it becomes considerably stronger cattle and then objects perfectly can be chromed, made from alloys of iron that are otherwise difficult to chromate higher carbon contents exist. Accordingly, the subject matter of the invention is a method the surface of objects made of iron or steel by diffusion at the same time in chromium and silicon by enriching the cleaned objects in a sealable container into a mixture containing more than 5% silicon Silicon, ferrosilicon or silicon-containing alloys on the one hand and chromium chloride on the other hand used and in the then closed container for a few hours Temperatures of 8oo to 100o ° C can be heated. With the chromium chloride and the silicon together, depending on the properties that the diffusion layer should have, also other metals, such as molybdenum, tungsten or nickel, diffused will.
Um bei der Diffusion eine Oberflächenoxydation. ,auszuschließen, kann man entweder in nichtoxydierender oder besser reduzierender Atmosphäre arbeiten und zu diesem Zwecke Gase, wie Wasserstoff, Leuchtgas, Stickstoff o. dgl., in oder durch den Diffusionsbehälter leiten, oder man kann der zur Diffusion benutzten Mischung aus Silicium, Ferrosilicium oder siliciumhaltigen Legierungen einerseits und Chromchlorid andererseits einige Prozent Ammoniumchlorid, Aluminiumchlorid oder ähnliche Stoffe zugeben; die beim Erhitzen einen hohen. Dampfdruck entwickeln und etwa vorhandene Luft aus dem Gefäß verdrängen. Anstatt in der Mischung Chromchlorid zu verwenden, kann man die Chlorverbindung des Chroms auch .aus chlorabgebenden Stoffen, beispielsweise aus Alkali, Erdalkali- oder Aluminiumchlorid, und metallischem Chrom bzw. Legierungen des Chroms synthetisieren. Wenn es bereits vorgeschlagen ist, Gegenstände aus Eisen in einer Mischung von Aluminium, einem oder mehreren Carbiden eines Metalls oder Halbmetalls und -einer geringen Menge Chromchlorid zu behandeln und in dieser Mischung als Metallcarbid Siliciumcarbid zu verwenden, dann sollten dabei keine Oberflächenschichten erzeugt werden, deren Charakter im wesentlichen durch den Chromgehalt dieser Schichten bestimmt ist, und das Silicium in dieser Mischung sollte auch nicht den Zweck haben, die Diffusion des nur in geringem Anteil vorhandenen Chroms zu begünstigen.To cause surface oxidation during diffusion. , exclude, can work either in a non-oxidizing or, better, reducing atmosphere and for this purpose gases such as hydrogen, luminous gas, nitrogen or the like, in or pass through the diffusion container, or you can use the mixture used for diffusion of silicon, ferrosilicon or silicon-containing alloys on the one hand and chromium chloride on the other hand, a few percent ammonium chloride, aluminum chloride or similar substances admit; which have a high when heated. Develop vapor pressure and any existing Displacement of air from the vessel. Instead of using chromium chloride in the mixture, you can also use the chlorine compound of chromium. From chlorine-releasing substances, for example from alkali, alkaline earth or aluminum chloride, and metallic chromium or alloys synthesize chromium. If it is already proposed, items of iron in a mixture of aluminum, one or more carbides of a metal or to treat semi-metal and a small amount of chromium chloride and in this Mixing silicon carbide as metal carbide should not be used Surface layers are created whose character is essentially due to the chromium content of these layers is intended, and neither should the silicon in this mixture have the purpose of diffusing the chromium, which is only present in a small proportion favor.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST52628D DE728218C (en) | 1934-09-29 | 1934-09-29 | Process to enrich the surface layer of objects made of iron or steel by diffusion in chromium and silicon at the same time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST52628D DE728218C (en) | 1934-09-29 | 1934-09-29 | Process to enrich the surface layer of objects made of iron or steel by diffusion in chromium and silicon at the same time |
Publications (1)
Publication Number | Publication Date |
---|---|
DE728218C true DE728218C (en) | 1942-11-23 |
Family
ID=7466552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEST52628D Expired DE728218C (en) | 1934-09-29 | 1934-09-29 | Process to enrich the surface layer of objects made of iron or steel by diffusion in chromium and silicon at the same time |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE728218C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1095620B (en) * | 1952-07-11 | 1960-12-22 | Siemens Planiawerke Ag | Process for the production of firmly adhering, corrosion-resistant Si-containing protective layers on ferrous metals |
DE976547C (en) * | 1950-12-13 | 1963-11-14 | Onera (Off Nat Aerospatiale) | Process for the production of chromium-containing metallic diffusion coatings on objects made of iron, nickel, cobalt or their alloys |
DE1196932B (en) * | 1961-06-21 | 1965-07-15 | Telefunken Patent | Method and device for the production of diffusion layers in semiconductor bodies |
DE3249471T1 (en) * | 1982-05-07 | 1984-05-03 | Institut mašinovedenija imeni A. A. Blagonravova Akademii Nauk SSSR, Moskva | Process for the chemical-thermal treatment of workpieces made of steels and alloys |
-
1934
- 1934-09-29 DE DEST52628D patent/DE728218C/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE976547C (en) * | 1950-12-13 | 1963-11-14 | Onera (Off Nat Aerospatiale) | Process for the production of chromium-containing metallic diffusion coatings on objects made of iron, nickel, cobalt or their alloys |
DE1095620B (en) * | 1952-07-11 | 1960-12-22 | Siemens Planiawerke Ag | Process for the production of firmly adhering, corrosion-resistant Si-containing protective layers on ferrous metals |
DE1196932B (en) * | 1961-06-21 | 1965-07-15 | Telefunken Patent | Method and device for the production of diffusion layers in semiconductor bodies |
DE3249471T1 (en) * | 1982-05-07 | 1984-05-03 | Institut mašinovedenija imeni A. A. Blagonravova Akademii Nauk SSSR, Moskva | Process for the chemical-thermal treatment of workpieces made of steels and alloys |
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