JPS629949A - Abrasion-resistant material for fusion-welded to surface of structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wear-resistant material for fusion welding to the surface of a structure,
More specifically, it is applied to many structure surfaces such as transportation roads for heavy objects, walls of shot peening and sandblasting factories where metal powder is violently scattered, and processing table surfaces of workpieces, to provide resistance to the entire structure surface. Concerning wear-resistant materials for providing abrasion resistance.

[Prior Art] As is well known, there are many needs to provide wear resistance to the surfaces of structures such as road surfaces, floors, walls, and workpiece table surfaces.

For example, in a steelworks, steel ingots as products or materials,
In order to transfer steel materials, etc. to a predetermined location on a production or shipping line, the steel materials, etc. are transported by sliding them onto a steel transport path. As it rubs violently against heavy objects, it causes severe wear.
Naturally, road surface wear resistance is required. In this case, the above requirements could be met if the structures themselves, such as the transport road surface, were made of wear-resistant hard alloys, but this is not practical due to cost considerations, and for this reason, several conventional methods have been devised. has been completed.

One method is to lay out a large number of small hard alloy plates one by one by soldering them onto the surface of a structure such as a steel transport road or wall.

``Another method is to arrange a large number of pieces of hard material in the form of pieces or lumps in advance, pour molten iron or steel over them, solidify the whole thing in that state, and form a large number of pieces or pieces of hard material on the surface layer. This is a method of manufacturing abrasion-resistant materials that contain materials and laying out a large number of them.

Examples of wear-resistant materials used in this molten metal pouring method are
It is disclosed in Japanese Patent No. 7-28664.

[Problems to be Solved by the Invention] Both of these two techniques meet the requirements of imparting wear resistance to the conveyance path surface, wall surface, etc., and are actually quite effective; however, in the case of the first method, In this method, small plate-shaped hard alloy plates must be soldered one by one using a metal solder, which poses a problem in that the manufacturing process is laborious and costly. In addition, since the expansion coefficients of the hard metal and the surface of the structure are different, the strain after soldering,
Easy to crack. Furthermore, there are various types of hard metals such as WC type and TiC type, but since WC type is expensive, we would like to use TiC type, but TiC type is difficult to solder, so it is practically impossible to use TiC type. Therefore, there are restrictions on the materials used.

In the case of the second method, each composite wear-resistant material can be welded to the surface of the structure, so many can be welded at once when laying them out, which solves problems in terms of manufacturing time and cost. However, the hard materials that can be used to create each composite wear-resistant material are limited. That is,
When pouring over lumpy or flaky materials such as molten iron or steel, these hard materials must not float, so only hard materials with a specific gravity that is sufficiently higher than the specific gravity of molten iron or steel can be used. . For example, in the case of W C-T t C-Co based hard alloys, those with a large TiC composition cannot be used. Therefore, since inexpensive TiC etc. cannot be used, there is a limit to reducing costs.

Cermets particularly suitable as wear-resistant materials, such as TiC-N
i-Co-Fe and cheap and easily available nm! Ceramic A, M, 03, which is a wear material, and other Sin,
Materials such as BC and 5i02 cannot be used.

Therefore, when iron and iron compound metals are used as a base material, the surface layer of the base material is lighter than its specific gravity, and is easy to use in terms of performance and cost, for example. TiC-Nf-Co-Fe, Au203 or SiC
, Sin, BC, StO, etc. The present invention aims to provide a product that can be made into a wear-resistant material by enclosing a sintered body of a high-hardness hard material mainly composed of , Sin, BC, StO, or the like. This provides a composite wear-resistant material that is cheaper and easier to use.

[Means 9 Effects for Solving the Problems] The present invention has the following technical means for achieving the above object.

That is, to explain this using the symbols corresponding to the examples, in a wear-resistant material in which crushed pieces of hard material are sealed in the surface layer of a metal whose main components are iron and iron compounds; , metals whose main components are iron and iron compounds 5
On the surface layer of the powder, crushed pieces 6 of a sintered body of a highly hard and hard material having a specific gravity lower than that of the metal and having a major axis in the range of about 0.5 to 10 mm+ are placed, and in this state, it is pressed. At the same time, this molded object is manufactured by high-frequency induction heating, and one surface in which the lump-like, highly hard, hard material sintered fragments 6 are sealed is the wear-resistant surface 7, and the other surface is the fused surface. This is configured on the contact surface 8.

In the above, the present invention uses as a base material to enable fusion welding to metal surfaces of structures, machines, appliances, etc.
A metal mainly composed of iron and iron compounds is used, which most clearly represents its performance, but since this base material itself plays the role of supporting the high hardness hard material sintered body, it is preferably 0.2z.
A certain amount of carbon may be included to increase hardness, and stainless steel may be used when rust prevention is required.

However, unlike the conventional molten metal pouring method, powder is used.

In addition, in the case of the molten metal method, the specific gravity of this base metal, that is,
Production technology 1 - Only hard materials with a specific gravity heavier than the specific gravity of iron, approximately 7.869, can be used. High hardness has a specific gravity lower than that of iron and is easy to use in terms of performance and cost. It was not possible to use the hard material t11, or on the contrary, this invention was made using TiC-Ni, which is usually called cermet.
-Using crushed pieces 6 of a sintered body of a high-hardness hard material that has a specific gravity lower than that of iron, such as Co-Fe, Au203, which is a type of ceramic, or SiC, Sin, BC, SiO, and their compounds. It is something. The size of this high hardness hard material sintered compact crushing) 1-6 is that its major axis is 0.
You may select one with a diameter of about 5mm-10111a+ and use waste material. In this case, if the strength is high, such as crushed cermet material pieces, each piece may be relatively large, but if the strength is relatively low, such as crushed silicon pieces, each piece may be relatively large. By making the fragments smaller, we aim to increase the resistance to cracking against impact.

Further, as described above, the present invention provides a method of forming a lumpy high-density powder on the surface layer of a metal powder mainly composed of iron and iron compounds of a predetermined acid that can be fused to the metal surface 9 of structures, machines, devices, etc. After placing the crushed pieces 6 of the hard material sintered body, it is molded by high-frequency induction heating while applying pressure.This high-frequency induction heating is performed by placing the molded object in an alternating magnetic field and causing the inside of the molded object to be heated. Since eddy current is generated in the induction coil and generates heat due to its resistance loss, the degree of generation and penetration depth of this eddy current are determined by the strength of the current passing through the induction coil, the number of turns, the frequency, and the object to be molded itself. The material is selected optimally by taking into consideration the relative magnetic permeability and resistivity of the material. Normal frequency 2k
c/s~8kc/s, output 20~30kw, heating time 2
Performs in ~4 minutes.

In this implementation, high temperature and high pressure are applied to the metal powder, so the powder particles behave violently, and the metal particles instantaneously diffuse between the crushed pieces 6 of the sintered body of the high-hardness hard material, filling the pores and forming a dense structure. Bonded and molded into one piece. In this case, if the crushed pieces 6 of the sintered body of the massive high-hardness hard material are made of cemented carbide, it is considered that the binder of the cemented carbide and the binder on the metal powder side bond together. Moreover, the crushed pieces 6 are made of alumina AfL20-. In the case of something like this, it is thought that the metal powder wraps around it and binds.

The wear-resistant material obtained by polishing the surface after processing in this way has crushed pieces of a blocky high hardness hard material sintered body embedded in its negative side 7, so the other side 8 can be used for structures, machines, etc. It is placed on the metal surface of instruments, etc. by spot fusion welding.

[Example] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiment 1et/See Figures 1 to 4. Reference numeral 1 indicates a furnace, around which a high-frequency induction coil 2 is arranged. 3 and 4 indicate punches.

This furnace 1 is filled with iron powder (Fe) 5. Then,
The crushed pieces 6 of pattern A, 03 were placed on the surface layer of the iron powder. The size of the crushed pieces 6 is such that each maximum diameter is 1 mm to 8III1.
It was 1.

Then 30kg/c by a pair of punches 3.4
At the same time as pressurizing with rn', frequency 3 kc/s, output 2
It was heated for 2 minutes using a 0kW high frequency heating device.

As a result, it was possible to obtain an integral wear-resistant material having a circular shape with a total thickness of 1511I11 and a diameter of 30 mm, in which the negative face 7 was a wear-resistant face and the other face 8 was formed as a fusion welding face.

This surface is usually polished.

A large number of these were fusion-welded to the surface 9 of the conveyance path for heavy objects. In this fusion welding, for example, the wear-resistant material is placed on the surface 9 and the parts are spot fused and integrated.

As a result, sufficient wear resistance was obtained.

Example? - No. s/See FIG. 5 Iron powder (Fe) 5 was filled into a furnace l similar to that shown in Example 1. Next, a thin layer of copper powder (Cu) 10 was filled thereon. FIG. 5 shows crushed pieces of Tic-Ni-Co-Fe lump sintered cemented carbide placed on the surface layer of the iron powder (Fe) before this pressurization and heating. The size of the crushed pieces was 0.5 mm in diameter at the smallest, and 10 mm in diameter at the largest.

and 30 kg/c by a pair of punches 3.4
Pressurized at m', frequency 3kc/s, output 20kw
It was heated for 2 minutes using a high frequency heating device.

As a result, the total thickness is 11.5 mm+, and the diameter is 25 mm.
An integral wear-resistant material was obtained in which the negative side 7 was a wear-resistant surface and the other side 8 was formed as a fusion welding surface.

In this case, due to the presence of copper powder (Cu), the wettability between the Fe powder and the TiC-Ni-Co-Fe bulk sintered cemented carbide fragments was improved, and the binding property was increased. did.

In this way, a low melting point metal that improves wettability to the sintered cemented carbide may be interposed. The interposed low melting point metal powder and iron powder are sintered as one body.

[Effects of the Invention] As detailed above, the wear-resistant material of the present invention is made of crushed pieces of a block-like sintered body of a highly hard and hard material having a specific gravity lower than that of the base metal mainly composed of iron and iron compounds. Ti is placed on the surface layer 1- of the metal powder described in -1- and is molded by heating it at high temperature by high-frequency induction heating while applying pressure.
C-Ni-Co-Fe, Al2O2 or SiC+Ni
, Sin, BC, 5i02, etc. surfaces that are advantageous in terms of performance and cost; 10. ,, copper powder.

It is possible to provide a wear-resistant material in which crushed pieces of a sintered body of a high-hardness hard material are sealed in the surface layer, and as a result, it can be made into a wear-resistant material that can be used for various purposes. Since the material cost and processing cost are low,
It has various practical advantages such as being able to provide a wear-resistant material at a lower cost.

[Brief explanation of the drawing]

The attached drawings show embodiments of the present invention, and FIGS. 1 to 4 show the first embodiment, and FIG. 1 is a diagram showing the molding process.
Figure 2 is a cross-sectional view of the molded wear-resistant material, Figure 3 is a plan view of the molded wear-resistant material, Figure 4 is a diagram showing where the wear-resistant material is fusion welded to the surface metal of a structure, etc. FIG. 5 shows the second embodiment, and is a diagram showing the molding process.

Claims (1)

[Claims] This wear-resistant material has hard material fragments sealed in the surface layer of a metal whose main components are iron and iron compounds. A piece of a block-like sintered compact of a highly hard material having a specific gravity lower than that of , and having a major axis in the range of about 0.5 to 10 mm is placed on top of the crushed pieces of a sintered compact of high hardness, and at the same time, this molded object is subjected to high frequency induction while pressurized in that state. It is made by heating, and is characterized in that one surface in which crushed fragments of a sintered compact of highly hard and hard material are sealed is a wear-resistant surface, and the other surface is a fusion welding surface. Wear-resistant material for fusion welding to the surface of structures.