JPS60230986A - Method for highly alloying metal of metallic surface - Google Patents

Abstract

PURPOSE:To alloy highly the metal of the prescribed part of the surface of a metallic member without scattering metallic powder by forming the layer of a mixture of the metallic powder contg. elements for high alloying with an acrylic tacky binder on the prescribed part and by locally heating the part under specified conditions. CONSTITUTION:The layer of the mixture of about 90-99wt% metallic powder contg. elements for high alloying such as powder of high carbon ferrochrome with about 10-1wt% acrylic tacky binder such as acrylate polymer is formed on the prescribed part of the surface of the metallic member in which the metal is to be highly alloyed. The member is heated at about <=40 deg.C/min heating rate in a nonoxidizing atmosphere, and after holding the member at 150-380 deg.C for >=5min, the prescribed part is locally heated with a heating means having high energy density such as laser. The metal of the prescribed part can be highly alloyed in a high yield without scattering the metallic powder.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for highly alloying the surface of a remaining end, and more particularly, to a method for highly alloying a gold 8 member surface. This invention relates to a method of forming a powder, irradiating it with an electron beam, etc., and heating and melting it to form a high alloy.

[Prior art]

In order to improve physical properties such as abrasion resistance, heat resistance, and corrosion resistance of a specific part of the surface of a metal member, heating means such as laser, electron beam, or Fi-glazma arc are used as a method of highly alloying the part. There are known ways to do this. For example, in JP-A-57-11383 or JP-A-171-171, a mixture layer consisting of a high alloying metal powder and a binder is applied or adhered to the surface of a metal material. A method is disclosed in which alloy H is formed by irradiating the alloy with a beam such as a laser or an electron beam. However, in this method, when the binder is thermally decomposed by beam irradiation, the metal powder in the mixture layer and the binder or binder decomposition products are scattered, which not only deteriorates the yield of the alloyed layer but also deteriorates the alloying layer. This method has the disadvantage of generating pinholes and cavities in the layer and contaminating the lens of the laser device, so this method is likely to have problems in terms of practicality.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for highly alloying a metal surface, in particular a method for highly alloying a specific portion of a metal surface, without the drawbacks of the prior art described above.

[Structure of the invention]

The present inventor uses an acrylic adhesive binder as a binder, and coats specific parts of a metal member with a mixture of gold F14 alloy powder containing a high alloying element and this binder, This can be preheated and then locally heated with a beam or the like, or the mixture can be formed into a sheet metal, which is then preheated, bonded to a metal member, and then locally heated with a beam or the like. I found that my purpose had been achieved and completed Kibori 1.

According to the first embodiment of the present invention, a layer of a mixture of metal or alloy powder containing a highly alloying element and an acrylic adhesive binder is formed on the surface of the gold fJi member to be highly alloyed. , then in a non-oxidizing atmosphere, /30~3I
There is provided a method for highly alloying a metal surface, which comprises holding the metal surface in an OC for S minutes or more, and then locally heating the region to be highly alloyed using a high energy density heating means to highly alloy the surface.

Further, according to the first embodiment of the present invention, a sheet made by mixing and forming a metal or alloy powder containing a high alloying element and an acrylic adhesive binder is heated under a non-oxidizing atmosphere. After holding at 130~3g0oC for more than S minutes,
Adheres to the part of the surface of the metal member that is to be highly alloyed, and then
There is provided a method for highly alloying a metal surface, which is characterized in that the portion to be highly alloyed is locally heated with a heating means having a convex energy density to be highly alloyed.

Metal powder containing the high-alloying element used in the present invention (hereinafter referred to as "high-alloying metal powder")
may be any metal or alloy powder that is commonly used to impart desired properties, such as corrosion resistance, wear resistance, heat resistance, etc., and is not particularly limited. For example, high carbon ferrochrome (Cr:
60 to 1% by weight, C: 6 to 1% by weight, St:
g, θ ” city-u% or less, Fe: balance), M, for supply, sieve carbon ferromolybdenum (Mo: !r5~63 weight Q%, C:, !r~6 weight fjt%, Sl: 371
J amount % or less, Fe: balance), high carbon ferroboron for B supply (B: / Hiro ~ 23% by weight, C: O, S ~
ko, θ weight ratio, si: < weight fJ% or less, Fe: remainder)
, Cu powder (preferably ultrafine powder of /μ or less, more preferably 0.7μ or less), Nl
For supply, Ni powder, ferronickel (preferably 1%, Fe: balance, separate) For supply, ferrosilicon powder (Si: go% by weight, C: 0./k weight ratio, P: o, θ/1n (tl), S: θ
, 0/MH,%, Fe: balance), etc. Powders of these metals or alloys can be used alone depending on the purpose.

Alternatively, use a mixture of small and larger carp as appropriate. The particle size of this powder is generally 60 mesh or less.

The acrylic adhesive binder used in the present invention includes:
7 of acrylic ester and methacrylic ester
1 (combinations and copolymers, or copolymers of these esters and polymerizable monomers having functional groups capable of co-existence) are preferred.

Is the blending ratio of the metal powder for high alloying and the acrylic adhesive binder 90-9? Jushuchi, adhesive binder 70~
/ :iit. (・1 part is suitable. If the adhesive binder/weight is less than 11.ef), the adhesiveness will be insufficient and it will be difficult to attach the metal powder layer to the surface of the metal member. If the amount is more than -m, the resin content becomes excessive and the bonding between the highly alloyed layer and the surface of the metal member becomes insufficient, which is not preferable.

Various methods can be used to form a layer of a mixture of high alloying metal powder and acrylic adhesive binder on the surface of a metal member. For example, a liquid or paste obtained by adding an appropriate amount of a solvent such as acetone, toluene, methyl ethyl ketone, etc. to a mixture of high-alloying metal powder and an acrylic adhesive binder and kneading the mixture is used as a metal material coating "II". Alternatively, the above mixture may be formed into a sheet in advance and adhered to the desired area.Such sheets can be created by various methods.For example, The mixed wire liquid or mixed wire paste is poured onto a mold covered with a release paper, and after the solvent is evaporated, it is passed through a rolling roll to a suitable thickness, for example, O, !r~!;, Om. Form into a sheet. Alternatively, without using a solvent, knead a mixture of high alloying metal powder and adhesive binder while heating as necessary, and then form into a sheet. The powder sheet normally adheres easily by pressing it onto the surface of a metal component.However, if necessary, an acrylic resin used as an adhesive binder may be applied to the surface of the gold IfS component for temporary adhesion. The adhesive force may be reinforced by making the adhesive polymer JΔ equal to No. 1.

Instead of coating, a sheet of adhesive binder may be used as the temporary adhesive polymer A't.

After a mixture layer of the high-alloying metal powder and the acrylic adhesive binder is thus formed on the surface of the metal member (hereinafter, the adhered mixture 1i will be referred to as a "powder sheet layer"), this is preheated. This preheating should be performed in a non-oxidizing atmosphere such as an inert gas such as nitrogen or argon, a reducing gas such as hydrogen, or a vacuum to prevent oxidation of the high alloying powder and adhesive binder. It is inevitable.

The heating rate is preferably 90°C for 7 minutes or less. l
If it is larger than /-0ocZ, the low boiling point component in the adhesive binder will rapidly volatilize, resulting in damage to the powder sheet layer, generation of air bubbles on the adhesive surface, and peeling of the powder sheet layer. It may fall off, which is not desirable. This heat treatment is /! OoC~3IrOoC5Good”&L,<
Iti, 200oC~3! It is sufficient to hold it for rO'c-'Ck minutes or more. Through this heat treatment, the synthetic resin used as the adhesive binder and temporary adhesion polymer undergoes a thermal decomposition polycondensation reaction without being completely burned out, producing a tar pitch-like substance. This tar pitch-like substance maintains the adhesion of the powder sheet layer even at high temperatures.

Therefore, the powder sheet layer does not peel off, fall off, scatter, or become misaligned due to impact, vibration, or heating during irradiation with the equal pressure beam. If the heat treatment source 1 is lower than /30"C, the thermal decomposition of the resin component will not be sufficient, and therefore the amount of tar pitch-like substances produced will be small, and sufficient adhesive strength will not be obtained. On the other hand, the heat treatment temperature If it is higher than 3g0oc, the resin component will rapidly decompose, and in this case, the amount of tar pitch-like substances produced will be small.
Sufficient adhesion cannot be obtained.

If the heat treatment time is shorter than 5 minutes, tar pitch-like substances are insufficiently produced in K, and sufficient adhesive strength cannot be obtained. The treatment time is appropriately determined depending on the heat treatment temperature, the type of resin component, etc. Generally, it is unnecessary and uneconomical to hold the treatment for 110 minutes or more.

After preheating in this manner, this powder sheet layer is locally heated using a high energy density heating means to form a high alloy. As the high energy density heating means used in the present invention, for example, JP-A-Sho! 6-/!
;gg7/issue, JP-A-Sho-/! r, 5', EbJ
The conventionally used laser, electron beam, f-) Zuma arc, or tungsten inert gas arc may be used.

In the seventh embodiment of the present invention, as described above, a powder sheet layer is first formed on the surface of the metal member, and then this is preheated, and then heat treatment is performed using a beam or the like. Preheat the sheet first. That is, after preheating a sheet created by kneading and molding metal powder for high alloying and an acrylic adhesive binder,
It is adhered to the portion of the surface of the metal member to be highly alloyed through an adhesive, such as an acrylic adhesive binder, and then heat treated with a beam or the like. The sheet preparation method, preliminary heat treatment conditions, beam heat treatment conditions, etc. are the same as in the case of the first implementation.

〔Effect of the invention〕

In the present invention, an acrylic resin is used as a resin binder, and this is preheated to form a tar pitch shape, and then heat treated with a beam or the like.

There is no scattering of metal powder due to rapid gasification of the resin. Therefore, the yield of residual powder is high.

Furthermore, since the tar pitch-like substance ensures the bonding strength at high temperatures, the metal powder sheet does not fall off or the sheet is peeled off and the position of the sheet does not shift.

〔Example〕

EXAMPLES The present invention will be explained in more detail below with reference to Examples.

In the examples, "%" is -[1%.

Example / 7 eromolybdenum powder (Mo:
b 0%, C: 5%, SMJ%, P: 0003%
, s: o, ig tl), Cu: 0. Hiro S%,
Add an appropriate amount of acetone to 72 g of Fe (remaining part) and 3 g of acrylic adhesive binder and knead to form a paste LSI0C
The coating was applied to the surface of a drawing plate (C20 mm x 1 x S) to a coating thickness of 06S to 801, heated for 1 hour at 3θOOC in a hydrogen atmosphere, and then slowly cooled.

The Fe-Mo powder layer of the sample created in this way was
An alloy layer was formed on the S/θC9N plate by fermentation and melting using a tungsten argon gas arc (TIG).

Alloy 1 in this way? A microscopic photograph of the cross-sectional structure of ; is shown in FIG. In addition, the mononuclear alloy layer is E P MA (Elec
Tron Probe Micro Analyzer
Figure 2 shows the results of a line analysis of Fe and Mn using the method.

Example: Ferroboron powder (B: 20%,
C: /, lr%, Si: 3.3'A, A/: 0
．． 07%, Fe: Remainder) A:09 and an acrylic adhesive binder 3FIK were added and kneaded with a suitable amount of acetone, and then formed into a sheet with a thickness of S fin. Hereinafter, the same operation as in Example 1 was performed to deposit Fe-B on the 510C steel plate.
An alloy layer was formed. A micrograph of the cross-sectional structure and the results of line analysis of Fe and B by EPMA K are shown in Fig. 3 and Fig. 3, respectively.

[Brief explanation of drawings]

Figure 1 shows Fe formed on @plate-F by the method of the present invention.
This is a micrograph of the cross-sectional structure of the -M□ alloy layer, and Fig. 2 shows the following:
It is a graph showing the line analysis results of Fe and MO by EPMA. Figure 3 shows Fe-
This is a microscopic photograph of the cross-sectional structure of the B alloy layer, and the second figure is a graph showing the line analysis results of Fe and B by EPMA K. Figure 2 Alloy layer table @force/shicW-m-(μ)→

Claims (1)

[Claims] (11. Form a layer of a mixture of metal or alloy powder containing a high alloying element and an acrylic adhesive binder on the surface of the metal member to be alloyed, and then is maintained at 750 to 3g00C for more than S minutes in a non-oxidizing atmosphere, and then the area to be highly alloyed is locally heated using a high energy density heating means to highly alloy the metal surface. High alloying method. (2) A sheet made by kneading and forming a metal or alloy powder containing a high alloying element and an acrylic adhesive binder at iso to 3g0oC in a non-oxidizing atmosphere. S
After being held for at least a minute, the metal is bonded to a portion of the surface of the metal member to be highly alloyed, and then the portion to be highly alloyed is locally heated with a high energy density heating means to be highly alloyed. Surface alloying method.