DE2147755A1 - BORING AGENTS - Google Patents

Description

Munich, September 22, 1971 Dr. R.

ES 710? ■

2U7755

Boronating agents

It is known to do so with solid boriding agents for metals and alloys to borate that pian packs the parts in powder containing boronizing agent and then subjected to a temperature treatment. This mode of operation has the disadvantage that it is particularly difficult to use for complicated shapes Sharing results in a high consumption of borating agent. Farther The partial boronizing of workpieces and the boronizing of parts by mass with powdery · = η boronizing agents are very time-consuming.

A boronating agent has now been found for producing boron compound layers on metals and alloys using boron-releasing agents, optionally activators and optionally Additives that reduce the boron potential, whereby the boron-releasing substances may be replaced by non-reactive substances under boronization conditions. Refractory materials can be replaced individually or in a mixture, which eliminates these deficiencies. The Borierungsrü. ttel is characterized by this, that it is used in the form of a layer-forming mass.

It has proven to be expedient that the boronizing agent is used in the form of a paste, suspension or emulsion for brushing, dipping, pouring or spraying.

As borabgebende substances thereby ko.'Miien boron carbide, ferro-boron, amorphous boron CDER borax, in each case individually or in a mixture in Msngen 0.3 to 85 Gftvr.-i, preferably 2-81 wt · -. #, Based on the GesarvUvsni- o ^f Bori; rungfcmittel in embossing. The already known fluoroborates and / or halogen compounds of the alkali and / or alkaline earth metals and ammonium in amounts of 1-15% by weight, preferably 10% by weight, based on the total amount, are also suitable as active substances Eating means.

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The bond within the solid boronizing agents after the application and drying the inventive boronizing agent.; Ittel can be on different Types are made:

a) As binders are in water and / or in volatile and / or in flammable organic liquids, the completely or partially soluble salt-like constituents of the boronizing agent used.

b) Other binders which are soluble or swellable in water are used inorganic and / or organic substances used in which the

ψ salt-like constituents of the boronizing agent are insoluble or only partially soluble. A particularly suitable inorganic binder is water glass, which is used in a range of 5-30% by weight, preferably 10-20% by weight, based on the total amount of boronating agent.

c) Volatile and / or flammable organic liquids are also used used, which contain organic binders in dissolved form, and in which the salt-like constituents of the borating agent are not soluble.

The individual constituents of the borating agent vary within wide t limits. In general, it has proven to be two-critical when Boronizing agents from 10-90 wt., Preferably 20-80 wt. Jor fli'chtir'on and / ocl-jr breiml-aren organic liquids, which contain inorganic binders.

Through the use of the erf indun ^ :; {j :: i ^r jißc: u Borierun ^ sr Lttcl y. '. I ™ Aufsti'oichen, dipping, pouring or spraying achieved nan- in Töns ^ t: -: ' - ' Λΐη PuI-veroick principle an extremely economical application of the Boricrun ^ iiiii ttcl: ·. In addition, it is possible to use simple V.'üikq, sc ;; aj-fe ..l ^ rcrnunren zt -. 'Ischcn

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to boron-London and surfaces not to be borated in the case of partial boriding to manufacture. Far rhi. In simple V.Vise, η becomes the economical coating from i-assentteile rat Borierungsrrdtteln- enabled.

Furthermore, it was surprisingly found that in large parts the risk of damage is very reduced in contrast to the powder pack principle.

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Example 1

A borating agent of 82 wt .- 5 (consisting of 79 wt -% boron carbide, 16 wt .- $ S borax and 5 wt .- ^ Kaliuraborf tetrafluoride.) Was prepared and 18 parts by weight Jb v / ater was a paste? was applied about 5 mm thick on the ring gear of a pinion. After the paste had dried, a firm crust of boriding agent that adhered well to the workpiece resulted.

By using the fasting according to the invention, the partial boriding of the pinion was made possible in a very simple manner, while at the same time the boriding agent consumption could be reduced by over 90% to 9.7% compared to the cheapest fourth in the powder pack method.

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Example 2

From 40% ~ Gevi a borating agent (consisting of 4 wt .- ^ boron carbide, 75 wt .- ^ silicon carbide, 16 wt -.% Borax and 5 Gevi .- ^ potassium borofluoride). And 60 wt .- ^ a mixture of methanol and V / ater (parts by volume 2: 1) a paste was obtained which is suitable for dipping and spraying.

The drying of the paste coating could be accelerated by scarfing the solvent content. There was one firmly adhering borating agent layer.

Ex iel 3

From 15% by weight of a borating agent (consisting of 4.8% by weight Boron carbide, 44.2 wt .- ^ silicon carbide, 16 wt .- ^ Bora ?: and 5 wt .- ^ Kaliui.'boi-fluorid) and 85 wt .- ^ ethyl acetate, in which 10 Gew .- ^ .Polyvinyl acetate were dissolved as a binder, was get an injectable paste. After flaming the organic In the liquid, a well-adhering, solid boronizing agent layer was created. V-components coated with this ice-cream were able to work after a short time Time to be diffusion annealed.

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Claims (1)

2U7755 Patent claims Boronizing agent for the production of boron compound layers on metals and alloys using boron-releasing agents Agents, optionally activators and optionally additives that reduce the boron potential, with optionally the boron-releasing substances individually or by refractory materials that are non-reactive under boronization conditions be replaced in the mixture, characterized in that the borating agent in the form of a layer-forming mass is used. 2. Boriding agent according to claim 1, characterized that the boronizing agent in the form of a paste, suspension or emulsion for brushing, dipping, Pouring or spraying is used. j5. Boriding agent according to Claims 1 and 2, characterized characterized in that boron carbide, ferroboron, amorphous boron or borax each individually as boron-releasing agents or in a mixture in amounts from 0.5 to 85 wt .- ^, preferably 2 to oil wt .- #, based on the total amount of borating agent, be used. ¹ I. Borating agent according to Claims 1-3, characterized in that fluoroborates and / or halogen compounds of the alkali and / or alkaline earth metals and of ammonia in amounts of 1 to 15 Gc.v; .-; o, preferably h to 10%, are used as activators Wt .- ^, based on the Gc: i> ar. ti. narrow nutrients can be used. -6- 309813/0619 BAD OBWMIftftfc, ^^ _Ci .. _r% - * - ■ 2H7755 5. Boring needles according to claims 1-4, characterized that as a binder in water and / or in volatile and / or in flammable organic liquids the completely or partially legible salt-like constituents of the borating agent are used. 6. Borating agent according to claims 1-5 »characterized that other inorganic and / or organic substances which are soluble or swellable in water are used as binders can be used in which the salt-like constituents of the Borierungsraittels are not or only partially soluble. 7. Borierunksrrättel according to claims 1-6, characterized that as a binder, water glass in an amount of 5-30 wt. Jb, preferably 10.-20 wt. 5?, based on the Gesantnonge boriding soil is used. 8. Borating agent according to claims ± -7, characterized that volatile and / or combustible organic " Liquids are used that contain organic binders in dissolved form, in which the salt-like constituents of the boronizing agent are not soluble. 9. Boriding ratchet according to claims 1-8, characterized in that a borating agent is used which consists of 10-90 wt. ~ Yb, preferably 20-80 Cev. ^T. ~ $ boron-releasing agents, activators and stretching agents, 90-10 Govr .- ^, preferably 80-20% by weight water and / or volatile and / or flammable "organic liquids that contain the inorganic or organic binder. 309813/0619 BAD ORfGiNAt