JP2001107833A - Hydraulic machine and its manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hydraulic machine and its manufacturing method extending its life by simultaneously improving wear resistance and cavitation erosion resistance. SOLUTION: This hydraulic machine, provided with a water turbine runner 1 and an impeller, has a hard film layer 5 formed by flame spraying in a location receiving a shock by a flow of water or in a base material surface partly of at least the location, the hard film layer 5 is cermet material of matrix by stainless steel of NiCrCoAlSiB alloy adding Co, Al, Si as a main component of Ni, Cr and WC as a carbide dispersed in this matrix, and a component range of the cermet material is characterized by NiCrCoAlSiB: 10 to 35% and WC: 65 to 90% by weight %.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic machine excellent in abrasion resistance and cavitation erosion resistance and a method of manufacturing the same.

[0002]

2. Description of the Related Art A hydraulic machine using river water or the like as a working medium includes, for example, a water turbine for power generation provided with a runner for rotating a generator by converting potential energy of water into kinetic energy, or an impeller rotating. There is a pump that gives kinetic energy to a fluid.

[0003] In recent years, hydraulic machines using these fluids as working media have been increasingly used under adverse conditions containing large amounts of solids such as earth and sand.

[0004] At a running water contact portion such as a runner, an impeller, a guide vane, a stay vane, a sheet liner, etc. of a hydraulic machine operated under such conditions, the solid material collides and the wall thickness is reduced by the polishing action (hereinafter referred to as earth and sand abrasion). ), Cavitation erosion, or a combination thereof. For this reason, measures to reduce these damages are taken by spraying or overlay welding a high-hardness material using rubber lining or ceramics and a metal material to these damaged portions. Such a technique is described in, for example, Japanese Patent Publication No. Hei 5-57479 and Japanese Patent Laid-Open No. Hei 8-1935.
No. 68, JP-A-8-333670 and JP-A-8-254173.

[0005] Conventional runners or impellers of hydraulic machines are mainly made of 13Cr steel.

[0006]

However, 13C
With respect to the material hardness of the r-based steel, there was a problem that the runner was liable to cause earth and sand abrasion due to the grinding action and the grinding action of a solid substance mainly composed of silica sand in running water.

Further, there is another problem that erosion is generated on the runner surface due to the action of lumps generated when cavitation bubbles generated in a low-pressure portion of flowing water reach a high-pressure portion.

[0008] Further, if the combined action of earth and sand wear and cavitation erosion causes significant damage, there is a problem that the performance and life of the hydraulic machine are also reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides a hydraulic machine and a method of manufacturing the same, which have improved wear resistance and cavitation erosion resistance at the same time and have a longer life. The purpose is to:

[0010]

According to the first aspect of the present invention,
In a hydraulic machine having a water turbine runner or an impeller for converting potential energy and kinetic energy of water, a hard coating layer formed by thermal spraying on a part which is impacted by running water or at least a part of a base material surface which is a part of the part. And the hard coating layer is composed of NiCrCoAl containing Ni and Cr as main components and adding Co, Al, Si and B.
A cermet material of a stainless steel matrix, which is a SiB alloy, and WC as a carbide dispersed in the matrix, wherein the component range of the cermet material is:
NiCrCoAlSiB: 10-35% and WC: 65-90% by weight.

According to a second aspect of the present invention, in the hydraulic machine according to the first aspect, the porosity of the hard coating layer is 1% or less.

According to the first and second aspects of the present invention, a carbide-based hard coating layer is formed by using a thermal spraying method as a method of coating the hard coating layer.

At present, Vickers hardness is 450
The above films are not found in metallic materials. For this reason, as the hard coating layer, CrC, NbC and Ti
Carbide ceramics such as C or, _A1 2 _{0 3} or Cr
₂ 0 ₃ such as an oxide-based ceramics and cermet obtained by mixing the metallic matrix of NiCr type or the like is generally applied.

In the present invention, WC which is a carbide is selected as the thermal spraying powder. The reason for applying WC is that the maximum operating temperature of a turbine runner member is about 30 ° C., which does not require the characteristics required at high temperatures, and that the maximum hardness can be obtained as the current thermal spraying powder from the viewpoint of hardness. That's why. Although the addition amount of WC is specified as 65% or more and 90% or less, at least 65% is required as an addition amount.
If the amount is less than 5%, a predetermined hardness cannot be obtained, and if the amount exceeds 90%, the hardness is satisfied but the ductility and toughness are significantly reduced.

As a matrix material, stainless steel containing NiCr as a main component is preferable in consideration of corrosion resistance, and a sealing treatment using a spray gun for sealing pores after spraying or a gas flame of city gas or the like is preferable. Co, Al, Si and B were added as elements for lowering the melting point in the process. As in the present invention, the contents of Co, Al, Si and B are specified because if the respective addition amounts are too small, the sealing treatment cannot be performed, and if the addition amounts are large, the melting point decreases and cracks are formed in the sprayed coating. This is because it occurs.

[0016] The cermet spray coating formed by using such a material by a spraying method such as atmospheric pressure plasma spraying or high-speed gas flame spraying has pores. For this reason,
When the bonding strength between particles is weak, abrasion resistance and cavitation erosion resistance are inferior even if the hardness is sufficient. In addition, if the number of these thermal spray coatings is one, there is a concern that durability is further inferior. Therefore, the abrasion resistance and cavitation erosion resistance can be improved by suppressing the porosity in the hard coating layer to 1% or less and increasing the bonding force between particles.

Accordingly, in the thermal spraying, the porosity is set to 1% or less in order to make the hard coating layer dense, and the porosity of 1% or less is left, so that cracks due to the difference in linear expansion coefficient from the base metal are reduced. Generation and peeling can be prevented. Further, by using WC as a carbide and applying a powder having a NiCrCoAlSiB alloy as a matrix, a hard coating layer having corrosion resistance in flowing water can be obtained.

On the other hand, as a method of forming a hard coating layer having a high Vickers hardness of 1000 or more, there are methods such as PVD and CVD, which are extremely thin, having a maximum thickness of 30 μm, and are brittle. Therefore, separation from the cracks easily occurs along with the occurrence of the cracks. In addition, when a large amount of ceramic powder is added to the thermal spray coating or the build-up welding coating described below to maintain a hardness of 1000 or more, the ductility and toughness of the coating are significantly reduced, and cracks are likely to occur. Therefore, setting the hardness slightly lower to secure the ductility and toughness can prolong the durable life and reduce the cost.

According to a third aspect of the present invention, there is provided a hydraulic machine having a water turbine runner or an impeller for converting potential energy and kinetic energy of water, a part subjected to impact by running water or at least a part of the part. A hard coating layer formed by overlay welding on the surface, wherein the hard coating layer is composed of a matrix of austenitic stainless steel which is a NiCrCu alloy containing Ni and Cr as main components and Cu added, and dispersed in the matrix; Cr
A cermet material with one type of boride selected from B, TiB, ZrB and others. The component range of the cermet material is 80% to 95% of austenitic stainless steel and 5% of boride by weight%. 20%.

In the present invention, a hard coating layer in which a boride or an oxide ceramic is dispersed in a matrix of austenitic stainless steel is coated by overlay welding. As a build-up welding material, boride ceramics such as CrB, TiB and ZrB and NiCrCu are used as a matrix, and the amount of each boride is 5 to 20.
wt% is optimal. This is because if the addition amount is less than 5 wt%, it melts and decomposes in the matrix and has no effect. If the addition amount exceeds 20 wt%, B decomposes and lowers the melting point during overlay welding, causing hot cracking. It is because it becomes.

As a matrix material, Ni: C
Dilution during welding can be suppressed by setting the ratio of r to about 2: 1. Corrosion resistance can be significantly improved by adding Cu at 3 wt% or less.

The invention described in claim 4 is the second or third invention.
In the hydraulic machine described above, the hard coating layer is formed on the crown and shroud of the turbine runner, on the working surface side and the half working surface side of the turbine blade, on the entire surface except for the guide vane indicating portion, or on the slide of the sheet liner. It is a moving surface.

According to a fifth aspect of the present invention, in the hydraulic machine according to the second aspect, the thickness of the hard coating layer is 0.3 to 3.0.
mm.

According to a sixth aspect of the present invention, in the hydraulic machine according to the fifth aspect, stainless steel,
It is characterized by having an underlay layer formed of any one of a Co-based alloy and a Ni-based alloy.

When the difference in the coefficient of linear expansion between the base material and the hard coating layer becomes large, there is a concern that the hard coating layer may be peeled off. Therefore, stainless steel having a large linear expansion coefficient is used as in the present invention. Formed as a layer to prevent the hard coating layer,
Even if the hard coating layer of the upper layer is damaged by wear resistance, cavitation erosion resistance, etc. by forming the base alloy and Ni-based alloy as the lower layer, the wear resistance formed as the lower layer The life can be extended by the alloy.

In forming the thermal spray coating, 80% WC
It is feared that -20% NiCrCoAlSiB alone causes peeling during operation at the interface with the base material. For this reason, stainless steel and a Co-based or Ni-based wear-resistant alloy are applied as an undercoat to an optimum thickness for each thermal spraying method in order to prevent interfacial delamination and abrasion resistance, so as to reduce the thermal expansion difference during operation. In addition, the impact force due to the collision of the earth and sand or the like can be reduced, and the durability life can be improved.

According to a seventh aspect of the present invention, in the hydraulic machine according to the third aspect, the thickness of the hard coating layer is 1 to 4 mm.

According to an eighth aspect of the present invention, in the hydraulic machine according to the seventh aspect, the hard coating layer comprises a NiCrCu alloy material, a boride and an oxide, and the amount of the boride and the oxide added. Is characterized by having an underlaying layer formed of an austenitic stainless steel material having a content of 5 to 40 wt%.

The ninth aspect of the present invention is the sixth aspect of the present invention.
In the hydraulic machine described above, the Vickers hardness of the hard coating layer is 450 or more.

[0030] The method for manufacturing a hydraulic machine according to claim 10 is as follows.
A step of spraying any one of stainless steel, a Co-based alloy or a Ni-based alloy onto a base material from a spray gun to form an underlay layer, and spraying a WC-NiCrCoAlSiB alloy material from a spray gun. Forming a hard coating layer, and heating the outer surface of the hard coating layer to 800 ° C. or more by a gas flame from the thermal spray gun or a vacuum furnace to locally melt the hard coating layer to reduce the porosity to 0%. It is characterized by the following.

In the present invention, after forming the hard coating layer,
In order to seal only the outer surface of the hard coating layer having self-solubility, a step of heating at a temperature of 800 ° C. or more was provided.

According to an eleventh aspect of the present invention, in the method for manufacturing a hydraulic machine according to the tenth aspect, the distance between the spray gun and the object to be sprayed is set to 150 to 250 mm.

In high-speed gas flame spraying and the like, the distance between the spray gun and the object to be sprayed is important. In the present invention, by defining the distance between the spray gun and the object to be sprayed to be 150 to 250 mm, the pores can be reduced. A hard coating layer having a ratio of 1% or less can be obtained.

According to a twelfth aspect of the present invention, in the method for manufacturing a hydraulic machine according to the tenth aspect, a powder of any one of stainless steel, a Co-based alloy or a Ni-based alloy and a WC-NiCrCoAlSiB alloy material is used. The particle size is set to be 20 to 70 μm.

In the present invention, by setting the powder particle size of the powder used for thermal spraying to 20 to 70 μm, the powder can be easily melted at the time of thermal spraying and the material can be prevented from remaining as unmelted particles.

According to the thirteenth aspect of the present invention, it is preferable that the temperature
9. A step of preheating the base material at a temperature not exceeding 00 ° C., a step of forming the underlay layer by overlay-welding the austenitic stainless steel material according to claim 8 to the surface of the base material. The method further comprises a step of forming a hard coating layer by overlay welding of the cermet material described above, and a step of gradually cooling the base material coated with the hard coating layer at a temperature equal to or lower than the atmospheric cooling.

In the overlay welding, before the hard coating layer is coated, preheating is performed at a temperature in the range of 200 ° C. or more and not more than 700 ° C., and after the hard coating layer is coated, it is gradually cooled at a cooling rate equal to or lower than the atmospheric temperature. By doing so, it is possible to prevent the hard coating layer and the base material from cracking against the deformation due to the shrinkage strain by slowly cooling at the crack generation rate of the hard coating layer and the base material against the deformation due to the shrinkage strain.

According to a fourteenth aspect of the present invention, in the method for manufacturing a hydraulic machine according to the thirteenth aspect, as the overlay welding method,
When the plasma powder welding overlay method is applied, the hard coating material coated on the base material has a powder particle size of 80 to 200 μm.

In the present invention, the powder used in the plasma powder overlay welding has a powder particle size of 80 to 200 μm, and a powder in which ceramic powder partially remains during melting.

If the powder used for forming the hard coating is too fine, it will vaporize at the time of melting, and if it is too large, it will remain as unmelted particles. ~ 7
0 μm, some unmelted particles remain by overlay welding,
Necessary as a resistance material against relatively large earth and sand etc. 8
It was specified as 0 to 200 μm.

According to a fifteenth aspect of the present invention, there is provided a water turbine runner obtained by welding a crown, a shroud, and a water turbine blade, which are hydraulic machine parts manufactured by the method for manufacturing a hydraulic machine according to the thirteenth aspect.

In the past, the Francis turbine runner was manufactured by integral casting, but in recent years, it is often manufactured by welding as in the present invention.

According to the present invention, after the surface modification, the crown, shroud, and blade are welded to produce a water turbine runner. By applying the hydro-mechanical parts with surface modification in this way, the quartz sand contained in the sediment in the running water collides with the hard coating layer on the surface of the turbine runner, preventing the sand from abrading and grinding. The wear resistance can be greatly improved, and the life of a hydraulic machine such as a runner or an impeller can be extended.

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 8 and Tables 1 and 2.

FIG. 1 is a perspective view showing the structure of the Francis turbine runner of the present invention.

As shown in FIG. 1, a Francis turbine runner 1 has a plurality of blades 4 between a crown 2 and a shroud 3.
Are provided, runner cones, guide vanes, not shown,
It is composed of a stay vane, a runner liner, and a sheet liner, and running water containing earth and sand that has passed through the stay vanes flows from the guide vanes to the blades 4, applies rotational energy to the runner blades 4, and falls downward.

In this embodiment, 13% Cr-4Ni steel is used as a base material constituting the Francis blade 4, and on this base material, specifically, the crown 2, the shroud 3, and the runner blade 4 shown in FIG. A hard coating was coated on the entire surface or a part of the sample by a thermal spraying method or a plasma powder overlay welding method. In the first embodiment, the hard coating layer was formed by a thermal spraying method, and in the second embodiment, the hard coating layer was formed by a plasma powder overlay welding method.

First Embodiment (FIGS. 2 to 5; Table 1) In this embodiment, a 13% Cr-
A hard coat layer was formed on a base material made of 4Ni steel to produce a Francis turbine runner 1. FIG. 2 shows a procedure for producing the Francis turbine runner 1.

FIG. 3 is a view showing a longitudinal section of the Francis turbine runner 1, and FIG. 4 is a view showing the surface of the blades 4 of the Francis turbine runner 1.

As shown in FIG. 2, the procedure for manufacturing the Francis turbine runner 1 was as follows: first, blade processing, crown processing, and shroud processing were performed. Then, a plurality of blades 4 were arranged at predetermined intervals between the crown 2 and the shroud 3 while the crown 2 shown in FIG. 3 was supported on the lower side and the shroud 3 was supported on the upper side by a jig (not shown). The ends of the blade 4 and the crown 2 and the shroud 3 were integrally connected by welding to form a Francis turbine runner 1 shown in FIG.

Thereafter, as shown in FIGS. 3 and 4, for example, the blade inlet end of the blade 4 into which the water flows in and out, that is,
80% WC-20% NiCrCoAlSiB by spraying method at the site where earth and sand wear occurs due to the collision of earth and sand particles
Was formed to complete the high-hardness Francis turbine runner 1.

FIG. 5 is a view showing a partial cross section of FIG. 4 on which the hard coating layer 5 is formed.

As shown in FIG. 5, the hard coating layer 5
The thickness of the hard coating layer 5 is about 0.3 m.
m to 3 mm. In addition, as the coating thickness in the thermal spraying, in each thermal spraying method, the bond strength between particles, porosity, the thickness to obtain the most excellent properties in the adhesion strength with the base material,
0.3 mm for atmospheric pressure spraying, 1.0 mm for high-speed gas flame spraying
mm, and 3 mm for high-pressure, high-speed gas flame spraying.

In the above-described thermal spraying method, 80% WC-20%
Although the hard coating 5 of NiCrCoAlSiB was applied, a case where the hard coating layer was formed by thermal spraying while changing the mixing ratio of WC and NiCrCoAlSiB was examined below. Specifically, as shown in Table 1, the mixing ratio of WC and NiCrCoAlSiB was determined according to Sample No. 1
Is NiCrCoAlSiB: 40% and WC: 60
%, Sample No. 2 is NiCrCoAlSiB: 20%
And WC: 80%, which were within the range of the present invention. In addition, the sample No. In No. 3, NiCrCoAlSiB: 5% and WC: 95%.

[0055]

[Table 1]

This sample No. 1 to sample no. Hardness (Hv) of thermal spray coating cross section obtained by changing components up to 3
And porosity (%) were measured, and the results are also shown in Table 1. As shown in Table 1, NiCrCo
AlSiB: 10 to 35% and WC: 65 to 90%. In the case of 1, the Vickers hardness is 98
It was as high as 6 Hv, and the porosity was 0.20%. In addition, the thermal spray test material showed sufficient ductility and brittleness without peeling or the like even in a 180 ° bending test. On the other hand, sample Nos. In sample No. 1, a sufficient hardness was not obtained, and In No. 3, although the hardness was 1058 Hv, which was sufficient, the ductility and toughness were significantly reduced.

According to this embodiment, by setting the mixing ratio of WC and NiCrCoAlSiB, which are components of the hard coating layer 5, within the range of the present invention, it is possible to obtain excellent wear resistance and cavitation erosion resistance. it can.

In this embodiment, WC and Ni are used.
The hard coating layer 5 made of a cermet material with a CrCoAlSiB alloy is coated mainly on a portion where the occurrence of sand and sand is expected to occur due to the collision of the sand particles of the Francis turbine runner 1, but such a specific portion is coated. The same effect can be obtained not only in the case where it is performed but also in the case where it is applied to the entire surface.

Second Embodiment (FIG. 6; Table 2) In this embodiment, a hard coating layer was formed on a base material made of 13% Cr-4Ni steel by using a plasma powder overlay welding method.

FIG. 6 is a diagram showing a manufacturing method in overlay welding.

As shown in FIG. 6, first, blade processing, crown processing and shroud processing were performed, and preheating was performed.
15% CrB-85% NiCrC on each part of crown 2, shroud 3, blade 4 by plasma powder overlay welding
The base material was coated with a hard coating layer 5 such as an alloy. Further, it is preferable that a hard coating layer 5 is previously formed on a portion where earth and sand wear occurs due to the collision of earth and sand particles. After coating the hard coating layer, a stress relief annealing was performed at a predetermined temperature to remove residual stress. And
A plurality of blades 4 were arranged at predetermined intervals between the crown 2 and the shroud 3 in a state where the crown 2 shown in FIG. 3 was supported on the lower side and the shroud 3 was supported on the upper side by a jig (not shown). Thereafter, both ends of the blade 4 and the crown 2 and the shroud 3 were integrally connected by welding to form a Francis turbine runner 1 shown in FIG. After forming, stress relief annealing was performed to remove residual stress, and a high-hardness Francis turbine runner was completed.

The hard coating layer 5 is formed on the base material 6, and when the build-up welding method is applied, the thickness of the hard coating layer 5 is 1 m.
m to 4 mm. In the overlay welding, the thickness is obtained as an overlay amount per pass. When the thickness is 1 mm or less, the amount of dilution into the base material 6 is large, and predetermined characteristics cannot be obtained. When the thickness is 4 mm or more, the number of cracks increases.

Next, the components of the hard coating layer 5 to be welded by the plasma powder overlay welding are shown in Table 2 as sample No. 4
From Sample No. It was changed to 7.

[0064]

[Table 2]

As shown in Table 2, the sample No. 4 is Cr
B: 5% and NiCrCu: 95%; 5
Is CrB: 10% and NiCrCu: 90%; 6 is CrB: 20% and NiCrCu: 80
%, Which are all within the scope of the present invention. Sample No.
7 is CrB: 30% and NiCr outside the scope of the present invention.
Cu: 70%.

This sample No. 4 to sample no. The hardness (Hv) of the cross section of the sprayed coating obtained by changing the components up to 7.
Was measured, and the results are similarly shown in Table 2.

As shown in Table 2, the Vickers hardness was 380 Hv or more, and excellent hardness was obtained. No. 7 cracked. On the other hand, sample N
o. 4 to sample no. The build-up welding materials up to 6 did not have cracks and the like, and the added ceramics were re-precipitated radially in the matrix.

According to the present embodiment, by setting the component composition range of the overlay welding material according to the present invention, it is possible to obtain a hydraulic machine that simultaneously improves wear resistance and cavitation erosion resistance and achieves a longer life. .

Accordingly, by forming the hard coating layer 5 by changing the components to be coated by the thermal spraying method and the welding method, the silica sand contained in the earth and sand in the running water is reduced to the Francis turbine runner 1.
Abrasion resistance against landslides caused by the grinding action and the grinding action by colliding with the hard coating layer 5 on the surface can be greatly improved, thereby extending the life of a hydraulic machine such as a runner or an impeller. .

Although the embodiment has been described with reference to the Francis turbine, the present invention is also applicable to runners of other hydraulic machines, such as Pelton turbines, variable blade turbines, and pump impellers. Further, the present invention can be applied to a guide burn of a hydraulic machine shown in the schematic diagram of FIG. 7 or a seat liner of a hydraulic machine shown in a schematic diagram of FIG.

[0071]

As described above, a hydraulic machine such as a runner or an impeller manufactured by the method for manufacturing a hydraulic machine according to the present invention may be used under conditions including solids such as earth and sand in a fluid. In this case, the life of the hydraulic machine can be remarkably improved because of excellent abrasion resistance, cavitation erosion resistance and corrosion resistance, and no performance deterioration due to a change in shape due to abrasion or damage.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a Francis turbine runner in an embodiment of the present invention.

FIG. 2 is a view showing a manufacturing process of the Francis turbine runner in the embodiment of the present invention.

FIG. 3 is a view showing a longitudinal section of the Francis turbine runner in FIG. 1;

FIG. 4 is a schematic view showing an example in which a hard coating layer is formed on blades of a Francis turbine runner in FIGS. 1 and 3.

FIG. 5 is a partial sectional view of a blade of the Francis turbine runner in FIG. 4;

FIG. 6 is a diagram showing a manufacturing process of the Francis turbine runner in the embodiment of the present invention.

FIG. 7 is a view schematically showing a mechanical member constituting a water turbine having a hard coating layer according to the embodiment of the present invention.

FIG. 8 is a view schematically showing a mechanical member constituting a water wheel having a hard coating layer according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Francis turbine runner 2 Crown 3 Shroud 4 Blade 5 Hard coating layer 6 Base material 7 Guide vane 8 Seat liner

Claims (15)

[Claims] 1. A hydraulic machine having a water turbine runner or an impeller for converting a potential energy and a kinetic energy of water by spraying on a portion which is impacted by flowing water or at least a base material surface which is a part of the portion. A hard coating layer, wherein the hard coating layer is composed of Ni and Cr as main components, and Ni added with Co, Al, Si and B.
A cermet material of a matrix of stainless steel, which is a CrCoAlSiB alloy, and WC as a carbide dispersed in the matrix, wherein the component range of the cermet material is NiCrCoAlSiB: 10% by weight.
-35% and WC: 65-90%. 2. The hydraulic machine according to claim 1, wherein the porosity of the hard coating layer is 1% or less. 3. A hydraulic machine having a water turbine runner or an impeller for converting potential energy and kinetic energy of water, wherein a build-up welding is performed on a portion which is impacted by flowing water or a base material surface which is at least a part of the portion. Having a hard coating layer formed by Ni and C
a matrix of austenitic stainless steel, which is a NiCrCu alloy to which Cu is added as a main component of r, and a cermet material of one kind of boride selected from CrB, TiB, ZrB and others dispersed in the matrix, The component range of the cermet material is:
Austenitic stainless steel: 80-95% by weight
% And boride: 5 to 20%. 4. The hydraulic machine according to claim 2, wherein the hard coating layer is formed on the crown and shroud of the turbine runner, on the entire working surface side and the half working surface side of the turbine wheel, and on the guide vane. A hydraulic machine characterized by being the entire surface excluding the indicator or the sliding surface of the sheet liner. 5. The hydraulic machine according to claim 2, wherein the thickness of the hard coating layer is 0.3 to 3.0 mm. 6. The hydraulic machine according to claim 5, wherein a stainless steel, a Co-based alloy, or a Ni
A hydraulic machine comprising a base layer formed of any one of the base alloys. 7. The hydraulic machine according to claim 3, wherein the thickness of the hard coating layer is 1 to 4 mm. 8. The hydraulic machine according to claim 7, comprising a NiCrCu alloy material, a boride and an oxide inside the hard coating layer, wherein the amount of the boride and the oxide is 5 to 40 wt%. A hydraulic machine having an underlay layer formed of an austenitic stainless steel material. 9. The hydraulic machine according to claim 6, wherein the Vickers hardness of the hard coating layer is 450 or more. 10. Stainless steel, Co-based alloy or Ni
A step of spraying any one of the base alloys onto a base material from a spray gun to form an underlay layer, and WC-NiCrC
oAlSiB alloy material is sprayed from a thermal spray gun to form a hard coating layer, and the outer surface of the hard coating layer is locally melted by heating the outer surface of the hard coating layer to 800 ° C. or more by a gas flame or a vacuum furnace from the spray gun. Setting the rate to 0%. 11. The method for manufacturing a hydraulic machine according to claim 10, wherein the distance between the spray gun and the object to be sprayed is 150 to 25.
A method for manufacturing a hydraulic machine, characterized in that the thickness is 0 mm. 12. The method for manufacturing a hydraulic machine according to claim 10, wherein one of stainless steel, a Co-based alloy or a Ni-based alloy, and WC-NiCrCo
A method for manufacturing a hydraulic machine, wherein a powder particle diameter of an AlSiB alloy material is set to 20 to 70 μm. 13. A step of preheating a base material at a temperature in the range of 200 ° C. or more and not more than 700 ° C., and overlay welding the austenitic stainless steel material according to claim 8 to the surface of the base material to form an underlay layer. Forming, forming a hard coating layer by overlay welding the cermet material according to claim 3, and gradually cooling the base material coated with the hard coating layer at a temperature equal to or lower than the ambient temperature. A method of manufacturing a hydraulic machine. 14. The method for manufacturing a hydraulic machine according to claim 13, wherein when the plasma powder welding overlaying method is applied as the overlay welding method, the powder particle size of the hard coating material coated on the base material is 80 to 80. A method for manufacturing a hydraulic machine, wherein the thickness is 200 μm. 15. A method for manufacturing a hydraulic machine, wherein a crown, a shroud, and a turbine blade, which are hydraulic machine parts manufactured by the method for manufacturing a hydraulic machine according to claim 13, are welded to obtain a turbine runner.