JP3694830B2 - Surface modifying material and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surface modifying material and a method for producing the same, and more specifically, a surface capable of improving various physical properties such as corrosion resistance of the substrate by attaching a surface modifying member to the surface to be modified of the substrate. The present invention relates to a modifying material and a manufacturing method thereof.
[0002]
For example, on the inner wall of a blast furnace that requires high corrosion resistance, the tip of a drill that requires high wear resistance, etc., cemented carbide that expresses desired corrosion resistance and wear resistance on the surface of the material as the base material, respectively ( It was joined by i) welding or (ii) brazing and surface modification was performed.
[0003]
The aforementioned (i) welding method is to weld the desired surface modification material itself to the substrate surface by electric welding or gas welding, and (ii) the brazing method is a desired surface modification. The material is joined to the surface of the base material via a brazing member.
[0004]
[Problems to be solved by the invention]
However, in the case of (i) welding by welding, since the linear expansion coefficients of the base material and the surface modified member to be welded are different, a large number of cracks are generated immediately after welding or after a lapse of a certain time. As a method for avoiding this phenomenon, there is known a method in which the base material is preheated (about 900 ° C.) to the same extent as the surface modified member to be welded, and the surface modified member is welded. In this case, since the preheating temperature of the base material is increased and the welding speed of the surface modification member is also decreased, the manufacturing cost is increased, the working environment is deteriorated, and the required technical level of the worker is Difficulties such as high points are pointed out.
[0005]
Further, since the surface modifying member is melted by welding and deposited on the base material, the elemental components constituting the base material are taken in as impurities into the surface modifying member, which is required as a result. It is considered that various physical properties such as corrosion resistance, wear resistance and strength are adversely affected.
[0006]
On the other hand, in the case of (ii) joining by brazing, the joining strength between the base material and the surface modifying member is determined by the brazing member. Accordingly, when the brazing member is poured, if the brazing member does not sufficiently spread between the base material and the surface modifying member, the required bonding strength cannot be obtained, and as a result, the surface modifying member It easily peels off.
[0007]
Also, for example, when the shape of the base material has a predetermined curvature, such as a drill string stabilizer used in oil well technology, if the curvature of the base material and the curvature of the back surface of the surface modification member are not the same, It is pointed out that the thickness of the brazing member that determines the bonding strength is not uniform and causes partial parallax. Further, as in the case of the above-mentioned (i) welding by welding, cracks are easily generated due to the thermal stress generated from the difference in linear expansion coefficient due to the heat shock (thermal shock) in use.
[0008]
OBJECT OF THE INVENTION
In view of the above problems inherent in the conventional surface modifying material and the method for producing the same, the present invention has been proposed to suitably solve the problem, and the surface modifying member is disposed on the substrate at a predetermined distance. A plurality of the surface modification members are arranged so as to be spaced apart from each other by a predetermined distance, and the gaps are filled with a filler, so that the surface modification members are three-dimensionally disposed on the substrate. An object of the present invention is to provide a surface modified material having high toughness that is bonded and exhibits sufficient durability against thermal shock and the like, and a method for producing the same.
[0009]
[Means for Solving the Problems]
In order to overcome the above-mentioned problems and achieve the intended purpose, the surface modifiers according to the invention of the present application are mutually positioned at predetermined positions on the surface to be modified of the substrate where surface modification such as wear resistance is required. A surface modification member fixed at a predetermined interval;
Filled in the adjacent surrounding space of the surface modifying member, and composed of a filler made of a brazing composition that joins the surface modifying member to the modified surface of the base material ,
Width of the gap provided between the surface-modified member and the substrate is from 0.1 to 0., Characterized in that it is set in a range of 4 mm.
[0010]
In order to overcome the above-mentioned problems and achieve the intended object, a method for producing a surface modifying material according to another invention of the present application is a modification of a base material on which a plurality of surface modifying members are subjected to surface modification). Arranged and fixed so that a gap is defined by separating the predetermined surface from the base material by a predetermined interval and by separating the substrate from the base material by a predetermined interval.
Next, a filler made of a brazing composition is filled in the gaps between the surface modification members by powder spraying, and is provided between the surface modification member and the surface to be modified of the substrate. 0 width of the gap to be. 1-0. with bonded set in a range of 4 mm, characterized in that so as to bond the surface modifying member mutually adjacent.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, the surface modifying material and the method for producing the same according to the present invention will be described below with reference to the accompanying drawings by way of preferred examples. The inventor of the present application regularly arranges the surface modification members having a regular geometric shape such as a rectangular shape on the planned modification surface of the base material at predetermined intervals, By filling a filler that acts as a bonding substance and develops toughness between the base material and the surface-modified member and between the surface-modified members, it is excellent in corrosion resistance and wear resistance and is strong. It has been found that a surface modifying material capable of expressing a good bonding force can be obtained.
[0012]
As shown in FIGS. 1 and 2, the surface modifying material 10 includes a base material that becomes a base 12, and a plurality of rectangular surface modifying members 14 that are regularly arranged on the base 12. The surface modifying member 14 is joined to the base material 12 and is formed of a filler 16 that joins the adjacent surface modifying members 14 together.
[0013]
As shown in FIG. 3, the manufacturing method of the surface modifying material 10 includes an arrangement step S1 in which the surface modifying member 14 is disposed on the substrate 12, and a fixing for fixing the surface modifying member 14 on the substrate 12. Basically, from the step S2, the filling step S3 for filling the filler 16 between the surface modifying member 14 and the base material 12 and between the plurality of surface modifying members 14, and the finishing step S4 for final finishing. become.
[0014]
The arranging step S1 is a step of regularly arranging the surface modifying member 14 at a predetermined interval on the base material 12 subjected to surface modification by the surface modifying member 14, and a fixing step S2 described later. It is a preliminary stage for performing.
[0015]
The surface modifying member 14 is basically a two-dimensionally regular geometric shape and has a flat surface, specifically, a geometric polygonal shape such as a triangular shape or a quadrangular shape, or an ellipse. In this embodiment, a rectangular planar object having a size of 13.25 mm in the longitudinal direction and 5 mm in the lateral direction is used (see FIG. 1). In the case of such a rectangular shape, the dimensional ratio between the longitudinal direction and the lateral direction is set in a range of 100: 10 to 100: 100. If the dimensional ratio is greater than this, the strength in the longitudinal direction of the surface modifying member 14 is lowered, and it is difficult to cope with the shape when the surface of the base material 12 has a curvature. Since the thickness of the surface modifying member 14 is related to an effective use period in which corrosion resistance or abrasion resistance can be expressed as it is, the thickness of the surface modifying member 14 is maximized within a range in which a sufficient bonding force is expressed with respect to the substrate 12. In this embodiment, it is set to 30 mm. Although the surface modification member 14 having no regular geometric shape can also be adopted, for example, the point of the shape is located outside the shape by providing, for example, a large number of acute protrusions. Cannot be adopted.
[0016]
As the material of the surface modifying member 14, a cemented carbide, various ceramics, or the like is adopted, and is appropriately selected according to various physical properties required such as heat resistance, corrosion resistance, or wear resistance. In particular, when a corrosion resistance and an abrasion resistance are required, a carbide carbide alloy or a chromium carbide alloy is preferable.
[0017]
Further, as shown in FIG. 4, a gap 20 of about 0.1 to 0.4 mm is defined between the surface modifying member 14 and the substrate 12 at the corners of the bottom surface of the surface modifying member 14. Protruding projections 14a are provided. The protrusion degree of the protrusions 14a is set together with the gap 20 when the surface of the base material 12 is a flat surface. , At least 0.1 mm (see FIG. 4). Accordingly, the size of the protrusion 14a varies depending on the size of the surface modifying member 14. The gap 20 has a great influence on the bonding strength between the surface modifying member 14 and the substrate 12, and if it is smaller than 0.1 mm, the gap 16 is sufficiently filled with a filler 16 (described later). In addition, if it is larger than 0.4 mm, the strength of the filler 16 itself becomes the bonding strength between the surface modifying member 14 and the substrate 12, and in any case, the bonding strength is lowered. It is necessary to be careful.
[0018]
Further, regarding the arrangement of the plurality of surface modifying members 14, the surface modifying members 14 are arranged apart from each other by a required distance so that a filler 16 described later can be sufficiently poured into the gap 20. In the case of a geometric polygonal object, the separation distance at this time is set to 0.3 to 100 by setting the length of the line segment that can set the longest distance in the polygonal object to 100 to 100. In the case of the rectangular shape described in (1), the length in the short direction is set to 100, and the range is set in the range of 3 to 100.
[0019]
As described above, since the adjacent surface modification members 14 are separated from each other while maintaining a predetermined interval, the amount of the members 14 required to cover the substrate 12 is the same area. As compared with the case where the entire base material 12 is covered, a reduction of about 20% is possible. However, the reduction in the coating area has little effect on the surface modification action such as wear resistance, and in particular, there is almost no influence on the direction indicated by the arrows in FIGS. 1 and 7 (described later). There is no problem.
[0020]
As specific means for disposing the surface modifying member 14 on the base material 12, as shown in FIG. 5, the surface modifying member 14 has a size that matches the planned modification surface of the base material 12 to be fixed. There is a method of using an arrangement member 40 having an arrangement portion 42 on which the surface modification member 14 can be positioned on the arrangement bottom surface of the surface modification member 14 of the material 12. In this case, the placement member 40 is first placed on the modified pre-bottom surface of the base material 12 (see FIG. 5A), and then the predetermined position of the placed placement member 40 (surface modification of the base material 12). The surface modifying member 14 is disposed with respect to the through-hole portion 42 provided in the material member 14 (corresponding to a predetermined arrangement position) (see FIG. 5B). The arrangement member 40 is removed from the substrate 12 after the fixing step S2 described later (see FIG. 5C). By using such an arrangement member 40, it is possible to accurately measure the separation distance between the surface modification members 14 described above and to quickly arrange the surface modification member 14. The thickness of the arrangement member 40 used here is preferably about half that of the surface modification member 12. As a material, a material that can withstand various conditions such as temperature when the surface modifying member 14 is fixed on the base material 12 and that corresponds to the fixing method used in the fixing step S2 described later is preferable.
[0021]
Further, as a more efficient means, as shown in FIG. 6, a method of using the arrangement member 40 and the surface modification member 14 as a sheet-like material 44 can be employed. That is, the surface modifying member 14 is integrated with the arrangement member 40 in which the surface modifying member 14 is detachable in advance to form a sheet-like material 44, and the sheet-like material 44 is modified to the base material 12. After placing the plurality of surface modification members 14 at a predetermined position on the base material 12 (see FIG. 6B) at a time (see FIG. 6A), the placement member 44 is placed on the planned material surface (see FIG. 6A). A method of removing (see FIG. 6C) is also conceivable. In particular, this method is convenient for transportation of the surface modification member 14 because the sheet-like material 44 having the arrangement pattern of the surface modification member 14 on the substrate 12 is obtained in advance. Moreover, it is suitable when mass-producing the surface modifying material 10 from the base material 12 having the same shape. As a material, in addition to the conditions described in the above [0020], a tape material or the like capable of attaching and temporarily fixing the surface modifying member 14, and flexibility capable of easily attaching and detaching the surface modifying member 14 A heat resistant rubber such as silicone or polyurethane rubber having
[0022]
In addition, in order to efficiently arrange the arrangement member 40 and the sheet-like material 44 on the base material 12, it does not become an obstacle to the attachment of the surface modification member 14 on the base material 12, for example, is fitted in a corner or the like A protrusion may be provided, and the arrangement member 40 and the sheet-like object 44 may be provided in the fitting holes corresponding to the fitting protrusion, respectively.
[0023]
The fixing step S2 is a step of fixing the surface modification member 14 arranged at a predetermined position in the arrangement step S1 on the base material 12. Various methods can be used for the fixing. In this embodiment, since the base material 12 and the surface modifying member 14 are conductive substances, an electrode rod is attached to the surface of the surface modifying member 14. A fixing method by so-called electric welding is adopted in which welding is performed by concentrating the electricity from the electrode rod at the contact portion between the protrusion 14a and the base material 12 by bringing them into contact with each other. Further, when an inorganic material such as ceramic is employed as the surface modifying member 14, an adhesive having required heat resistance is preferably used.
[0024]
The aforementioned electric welding is carried out as standard conditions, for example by passing a voltage of about 75 volts and a current of about 5000 amperes.
[0025]
In the filling step S3, the filler 16 is poured between the surface modifying members 14 that have been fixed at predetermined positions in the fixing step S2, and the surface modifying member 14 is placed on the substrate 12. Is three-dimensionally covered and bonded while ensuring high macro toughness.
[0026]
As the filler 16, various brazing compositions are preferably used. These fillers 16 are appropriately selected according to the physical properties (particularly heat resistance) required for the surface modifying member 14. As the brazing composition, such as nickel N i-Cr-based alloy, chromium or boron-based alloy is suitable for Koto.
[0027]
If before Symbol filler 16 is brazed composition, the brazing composition is melted as above the melting temperature, it may be poured thereafter. Since the space between the plurality of surface modification members 14 and the gap 20 is provided with a sufficient space for the filler 16 as the brazing composition to be sufficiently poured, the plurality of surface modification members 14. And the surface modifying member 14 and the substrate 12 can be joined with sufficient strength. In this case, a powder spraying method is particularly suitable as a filling method of the brazing composition.
[0028]
Usually, the filler 16 is filled to such an extent that the surface modification member 14 fixed on the substrate 12 is covered. Accordingly, the surface modifying member 14 is filled not only on the base material 12 side, that is, on the back surface side but also on the lateral side with the filler 16 in all directions. As a result, even if the bonding strength itself expressed by the filler 16 does not change, the bonding area is increased, so that the total bonding force is dramatically improved as compared with the conventional one.
[0029]
Further, unlike the surface modifying member 14, the filler 16 can express high sufficient toughness. Therefore, the surface modifying member 14 that is three-dimensionally covered with the filler 16 is also provided. If the surface modifying material 10 is taken as a whole, the toughness is improved. That is, various phenomena such as cracks or peeling of the surface modification member 14 due to a thermal shock or the like generated due to a difference in linear expansion coefficient between the surface modification member 14 and the substrate 12 are avoided.
[0030]
The final stage S4 is a stage in which final finishing and inspection of the obtained surface modification material 10 are performed. Through the final stage S4, the surface modifying material 10 is completed as a product. Polishing may be performed as the final finish described above, and the filler 16 covering the surface modifying member 14 may be removed by polishing so that the surface modifying member 14 is completely exposed. This operation is not necessary when the obtained surface modifying material 10 places importance on corrosion resistance and wear resistance, but is performed when the surface modifying material 10 requires precise dimensional accuracy.
[0031]
[Another example]
In the above-described embodiment, the case of a new article that satisfies the physical properties required by the base material to be surface-modified as the surface-modifying member has been described, but the present invention is not limited thereto, and as the surface-modifying member, For example, a waste product such as a cemented carbide chip in which a cemented carbide material is suitably used, such as a lathe, may be used. In this case, since the waste product is recycled and reused as the surface modifying member 54, the manufacturing cost of the surface modifying material 50 can be greatly reduced. In addition, the above-mentioned cemented carbide chip cannot be used even if extremely small chipping occurs, and since the reuse field and route are hardly established, it is extremely effective from the viewpoint of resource saving and resource reuse.
[0032]
As shown in FIGS. 7 and 8, the surface modifying material 50 using the cemented carbide chip as the surface modifying member 54 is separated from the surface to be modified of the base material 52 by a predetermined interval. 54 is disposed. The shape of the surface modifying member 54 is a substantially equilateral triangular shape which is a general shape of a cemented carbide chip, and the normal arrangement form on the base material 52 is that the surface modifying members 54 and 54 adjacent to each other are arranged. The surface modification members 54 are arranged so as to be opposite to each other, that is, more surface modification members 54 are most efficiently within the same area. At this time, the gap 58 defined between the surface modifying member 54 and the base material 52 is set to 0.1 to 0.4 mm as in the above-described embodiment, and the surface modifying member 54, Between 54, when the one side of this surface modification member 54 is set to 100, the space | interval of the range of 3-100 is provided.
[0033]
[Another embodiment]
Further, as a configuration and method for increasing the bonding strength between the base material 12 and the surface modifying member 14, as shown in FIGS. 9 and 10, the base material 12 and / or the surface that is brought into contact prior to the fixing step S2. The fusible metal layer 60 may be applied to the surface of the modifying member 14 by a known means such as coating or spraying. The fusible metal layer 60 has the effect of improving the weld adhesion between the base material 12 and the surface modifying member 14, and when the fusible metal layer 60 is also formed on the base material 12, There is an effect of avoiding the oxidation of the base material 12 and suppressing the decrease in bonding strength. The fusible metal layer 60 preferably has a thickness of 0.1 to 10 mm, and the material is preferably a copper-based, nickel-based or iron-based alloy. This configuration and method can be employed only when the surface modifying member 14 is a conductive material such as metal and is fixed on the base material 12 by electric welding.
[0034]
【The invention's effect】
As described above, according to the surface modifying material and the method for producing the same according to the present invention, the surface modifying members that exhibit the surface modifying action such as corrosion resistance or wear resistance are separated from each other by a predetermined distance and joined together. The base material to be spaced apart from the base material by a predetermined distance, and the gap defined thereby is filled with a filler so that the surface modifying member is three-dimensionally covered and joined to the base material. As a result, the required surface modification action and high toughness can be exhibited together. Further, the ratio of the planned modification surface of the base material covered with the surface modification member is about 80% without affecting the surface modification action such as wear resistance from a specific direction. The total amount of the surface modifying member can be reduced.
[0035]
Furthermore, the same effect can be exhibited also by reusing, for example, a cemented carbide chip, in which a cemented carbide material is used and the field of reuse after disposal is hardly established. In this case, it is possible to achieve both reduction of the manufacturing cost of the surface modifying material and resource saving of the reused member.
[Brief description of the drawings]
FIG. 1 is a plan view showing a surface modifier according to a preferred embodiment of the present invention.
FIG. 2 is a perspective view showing a part of the surface modifying material according to a preferred embodiment of the present invention.
FIG. 3 is a process diagram showing a method for producing a surface modifying material according to a preferred embodiment of the present invention.
It is a state diagram showing the state inside a machine roughly.
FIG. 4 is a cross-sectional view showing a gap defined between the base material and the surface modifying member when the base material is a curved surface.
FIG. 5 is a state diagram showing a case where an arrangement plate is used in arrangement / fixation of a surface modifying member to a base material.
FIG. 6 is a state diagram showing a case where a sheet-like material is used in disposing / fixing the surface modifying member to the base material.
FIG. 7 is a plan view of a surface modifying material according to another embodiment.
FIG. 8 is a cross-sectional view taken along the line AA of the surface modifier according to FIG.
FIG. 9 is a cross-sectional view of a surface modifying material according to yet another embodiment.
FIG. 10 is a process chart showing a method for producing the surface modifying material according to FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 12 Base material 14 Surface modification member 14a Protrusion 52 Base material 16 Filler 20 Crevice 44 Sheet-like thing 54 Surface modification member 56 Filler 60 Fusible metal layer 58 Crevice

Claims (15)

Surface modifying members (14, 54) that are fixed to each other at predetermined positions on the planned modification surface of the base material (12, 52) that requires surface modification such as wear resistance,
It said surface is filled around the space adjacent each other in the reforming member (14 and 54), row of bonding the surface reforming member (14, 54) with respect to reforming scheduled surface of the substrate (12, 52) And a filler (16, 56) made of an adhesive composition ,
Width of the gap (20,58) provided between the surface-modified member (14, 54) and said substrate (12, 52) is from 0.1 to 0. Is set in a range of 4 mm < A surface modifying material characterized by the above.   The back surface and all the side surfaces of the surface modifying member (14, 54) on the base material (12, 52) side are at least covered in contact with the filler (16, 56). Surface modifier.   The fusible metal layer (60) is laminated in the range of 0.1 to 10 mm on the surface of the surface modifying member (14, 54) and / or the base material (12, 52). The surface modifying material described.   The surface modifying member (14, 54) is a polygon having a geometric shape, and a ratio between a maximum length in the maximum length direction of the polygon and a maximum length in a direction crossing the direction is The surface modifier in any one of Claims 1-3 which exists in the range of 100: 10-100: 100.   5. The surface modification according to claim 4, wherein the distance between the surface modification members (14, 54) is in the range of 0.3 to 100 when the maximum length in the maximum length direction is 100. 6. Wood.   The surface modifying members (14) are rectangular and regularly arranged, and the ratio of the length in the longitudinal direction to the length in the lateral direction is in the range of 100: 10 to 100: 100. 4. The surface modifying material according to any one of 3.   The surface modifying material according to claim 6, wherein the distance between the surface modifying members (14) is in the range of 3 to 100, where 100 is the length in the short direction. The gap (20), any of the surface-modified member substrate in (14) (12) a plurality of projections provided at a predetermined position of the modified plan surface claim defined by (14a) 1 to 7 The surface modifying material according to crab . The surface modifying material according to any one of claims 1 to 8 , wherein the surface modifying member (14, 54) is made of a tungsten carbide alloy or a chromium carbide alloy. The filler (16, 56) is a surface reforming material according to any one of claims 1-9 consisting of N i-Cr-based alloy. The surface-modified member (54) is a surface reforming material according to any one of claims 1 to 10 comprising a refurbished carbide chips. A plurality of surface modifying members (14, 54) are spaced apart from each other by a predetermined interval with respect to the surface to be modified of the substrate (12, 52) to be surface-modified, and the substrate (12, 52) The gap (20,58) is arranged and fixed so that it is separated by a predetermined distance from
Then filler consisting of brazing composition to said gap through a mutual (20,58) and (16, 56) is filled with powder spraying of the surface-modified member (14 and 54), the surface modification said substrate member (14, 54) the width of the gap (20,58) provided between the reforming scheduled surface of the (12, 52) from 0.1 to 0. joining is set to a range of 4mm A method for producing a surface modifying material, wherein the adjacent surface modifying members (14, 54) are joined together. Prior to the placement / fixation of the surface modifying member (14, 54), the surface modifying member (14, 54) and / or the surface of the base material (12, 52) is within a range of 0.1 to 10 mm. The method for producing a surface modifying material according to claim 12, wherein the fusible metal layer (60) is laminated. The method for producing a surface modifying material according to claim 12 or 13 , wherein the surface modifying member (14, 54) is fixed to the surface of the substrate (12, 52) by electric welding. The surface-modified member (14) is according to any one of claims 12 to 14 which is adhered to the corresponding possible sheet to the mounting position of the reforming scheduled surface (44) in said substrate (12) A method for producing a surface modifying material.

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