KR20170102962A - Method for manufacturing a thermal coating, a turbine member, a gas turbine and a thermal coating - Google Patents

Abstract

The heat shielding coating (100) comprises a heat resistant alloy base material used for a turbine member, a longitudinal crack (C) formed on the heat resistant alloy base material and extending in the thickness direction, And a ceramic layer (300) including the ceramic layer (300). Sprayed particles composed of YbSZ having a particle size distribution of 50% and a particle size distribution of 40 占 퐉 or more and 100 占 퐉 or less are sprayed at a spraying distance of 80 mm or less, and longitudinal cracks C are sprayed at a rate of 0.5 / / Mm and a porosity of not less than 4% and not more than 15%, which is the sum of the longitudinal cracks (C) and the pores (P).

Description

Method for manufacturing a thermal coating, a turbine member, a gas turbine and a thermal coating

The present invention relates to a thermal coating, a turbine member, a gas turbine and a method for producing a heat shielding coating.

Priority is claimed on Japanese Patent Application No. 2015-025194 filed on February 12, 2015, the contents of which are incorporated herein by reference.

In order to improve the efficiency of the gas turbine, the temperature of the combustion gas used is set high. Thermal barrier coating (TBC) is applied to the surface of turbine blades such as rotor blades or stator blades exposed to such high temperature combustion gases. The heat-shielding coating is formed by covering a surface of a turbine member, which is a subject, with a sprayed material (for example, a ceramics-based material having a small thermal conductivity) with a low thermal conductivity by spraying. The thermal coating improves the heat resistance and durability of the turbine member.

As described in Patent Document 1, for example, the heat-shielding coating is provided with a metal bonding layer, which is an undercoat layer, and a ceramic coating layer, which is a top coat layer formed on the metal bonding layer, on the surface of a heat- . This ceramic layer is formed by spraying a mixed powder obtained by mixing a ceramic powder and a resin powder onto an undercoat layer. The ceramic layer described in Patent Document 1 is composed of longitudinal cracks and pores extending in the thickness direction and dispersed in the surface direction.

Japanese Patent Application Laid-Open No. 2013-181192

However, a dense coating having longitudinal cracks as described in the above-mentioned Patent Document 1 is called DVC (dense vertical crack) coating. The durability of the DVC coating is improved by having a dense structure having a vertical crack structure. However, since the DVC coating is dense in structure, the porosity is reduced, and the heat-shading property may be deteriorated.

The present invention provides a method for producing a heat shield coating, a turbine member, a gas turbine, and a heat shielding coating capable of improving heat resistance while ensuring sufficient durability.

In order to solve the above problems, the present invention proposes the following means.

The heat-shielding coating according to the first aspect of the present invention comprises a heat-resistant alloy base material used for a turbine member, and a heat-resistant alloy base material formed on the heat-resistant alloy base material, wherein longitudinal cracks extending in the thickness direction are dispersed in the surface direction, And the ceramic layer is formed by spraying thermal sprayed YbSZ particles having a particle size distribution such that the particle size distribution of 50% of the total particle size is 40 占 퐉 or more and 100 占 퐉 or less.

According to such a constitution, by using the sprayed particles composed of YbSZ having an integrated particle size distribution 50% particle diameter of not less than 40 탆 and not more than 100 탆, the sprayed particles are melted on the surface when the ceramic layer is formed by being sprayed on the heat- The core is left unmelted. Therefore, in the ceramics layer, a dense structure is formed by the surface of the molten sprayed particles, and a porous structure is formed by the remaining cores of the sprayed particles. Therefore, it is possible to obtain a ceramic layer having a porous structure including a pore having an amount required for ensuring heat resistance, while having a dense structure having longitudinal cracks necessary for ensuring sufficient durability.

In the heat-shrinkable coating, the longitudinal cracks may be dispersed at a pitch of 0.5 / mm or more and 40 / mm or less in the planar direction, and the porosity may be 4% or more and 15% or less.

In the heat-shrinkable coating, the longitudinal cracks may be dispersed at a pitch of 1 / mm to 6 / mm or less in the planar direction, and the porosity may be 9% or more and 15% or less.

In the heat-shrinkable coating, the longitudinal cracks may be dispersed at a pitch of 1 / mm or more and 2 / mm or less in the surface direction, and the porosity may be 9% or more and 10% or less.

According to this configuration, a ceramic layer having improved heat resistance can be obtained with high precision while ensuring sufficient durability.

In the turbine member according to the second aspect of the present invention, the heat shield coating is formed.

The gas turbine according to the third aspect of the present invention comprises the turbine member.

According to such a configuration, the turbine member can be prevented from being exposed to high temperatures for a long period of time and being damaged. Since the maintenance period can be extended, the frequency of shutting down the gas turbine can be reduced.

The method for producing a heat-shielding coating according to the fourth aspect of the present invention is a method for producing a heat-shielding coating on a heat-resistant alloy substrate used for a turbine member, which comprises a YbSZ having a particle size distribution of 50% And a ceramic layer forming step of spraying the particles and dispersing the longitudinal cracks extending in the thickness direction in the surface direction and forming a ceramic layer containing a plurality of pores therein.

According to such a configuration, by using the sprayed particles composed of YbSZ having an integrated particle size distribution 50% particle diameter of not less than 40 m and not more than 100 m, the sprayed particles are sprayed on the heat resistant alloy base material and, when the ceramic layer is formed, The core is left unmelted. Therefore, in the ceramics layer, a dense structure is formed by the surface of the molten sprayed particles, and a porous structure is formed by the remaining cores of the sprayed particles. Therefore, it is possible to obtain a ceramic layer having a porous structure including a dense structure having longitudinal cracks necessary for ensuring sufficient durability, and a porous structure including a required amount of pores for ensuring heat resistance.

In the method of manufacturing the heat shielding coating, the ceramic layer forming step is preferably performed such that the longitudinal cracks are dispersed at a pitch of 0.5 / mm or more and 40 / mm or less in the plane direction, and the porosity is 4% Layer may be formed.

In the method of manufacturing the heat shielding coating, the ceramic layer forming step is preferably performed such that the longitudinal cracks are dispersed at a pitch of 1 / mm to 6 / mm or less in the surface direction, and the porosity is 9% Layer may be formed.

In the method of manufacturing the heat shielding coating, the ceramic layer forming step is preferably performed such that the longitudinal cracks are dispersed at a pitch of 1 / mm to 2 / mm or less in the plane direction, and the porosity is 9% Layer may be formed.

According to this configuration, a ceramic layer having improved heat resistance can be obtained with high precision while ensuring sufficient durability.

According to the present invention, the thermal diffusivity can be improved while ensuring sufficient durability by using the sprayed particles made of YbSZ having a particle size distribution in which the 50% particle size of the cumulative particle size distribution is 40 m or more and 100 m or less.

1 is a schematic configuration diagram of a gas turbine according to an embodiment of the present invention.
2 is a schematic diagram showing a configuration in which a rotor is fixed to a jig according to an embodiment of the present invention.
3 is a cross-sectional view showing a schematic structure of a heat-shielding coating in an embodiment of the present invention.
Fig. 4 is a graph showing the relationship between the 50% particle size of the integrated particle size distribution of the sprayed particles and various characteristics in the embodiment of the present invention. Fig. 4 (a) 4 (b) is a graph showing the relationship between the particle size distribution of the 50% cumulative particle size distribution and the thermal cycle durability, and FIG. 4 (c) is a diagram showing the relationship between the cumulative particle size distribution 50% particle size and the thermal conductivity.
5 is a flowchart of a method for producing a thermal spraying powder according to an embodiment of the present invention.
6 is an enlarged view explaining the heat-shrinkable coating in the embodiment of the present invention.

Hereinafter, an embodiment according to the present invention will be described with reference to Figs. 1 to 6. Fig.

1, a gas turbine 1 according to this embodiment includes a compressor 2, a combustor 3, a turbine body 4, and a rotor 5. [

The compressor (2) introduces and compresses a large amount of air therein.

The combustor 3 mixes and combusts the fuel with compressed air (A) compressed in the compressor (2).

The turbine body 4 converts the thermal energy of the combustion gas G introduced from the combustor 3 into rotational energy. The turbine main body 4 converts the thermal energy of the combustion gas G into mechanical rotational energy by blowing a combustion gas G to a rotor (turbine member) 7 provided in the rotor 5, . The turbine body 4 is provided with a plurality of stator blades 8 on the casing 6 of the turbine body 4 in addition to the plurality of rotor blades 7 on the rotor 5 side. In the turbine body 4, these rotor blades 7 and the stator 8 are alternately arranged in the axial direction of the rotor 5.

The rotor 5 transfers part of the rotating power of the turbine body 4 to the compressor 2 and rotates the compressor 2. [

Hereinafter, in this embodiment, the rotor 7 of the turbine main body 4 will be described as an example of the turbine member of the present invention.

As shown in Fig. 2, the rotor 7 is a heat-resistant alloy base material formed of a well-known heat-resistant alloy such as Ni-based alloy. The rotor 7 of the present embodiment has a blade body portion 71, a platform portion 72, and a notched portion (not shown). The wing body portion 71 is disposed in a combustion gas flow passage through which the high temperature combustion gas G in the casing 6 of the gas turbine 1 flows. The platform portion 72 is provided at the proximal end portion of the wing body portion 71 and has a surface that intersects with a direction in which the wing body portion 71 extends. The wick root portion protrudes from the platform portion 72 to the side opposite to the wing body portion 71.

As shown in Fig. 3, the heat shield coating 100 is formed so as to cover the surface of the rotor 7, which is a heat resistant alloy base material. The heat shield coating 100 is formed on the surface of the rotor main body 71 and the surface of the platform portion 72 connected to the rotor main body portion 71, The heat shield coating 100 of the present embodiment has a metal bonding layer 200 to be laminated on the surface of the rotor 7 and a ceramic layer 300 to be laminated on the surface of the metal bonding layer 200.

The metal bonding layer 200 is formed as a bond coat layer which suppresses peeling of the ceramic layer 300 and is excellent in corrosion resistance and oxidation resistance. The metal bonding layer 200 is formed, for example, by spraying a metal spray powder of MCrAlY alloy as the sprayed particles onto the surface of the rotor 7. Here, "M" of the MCrAlY alloy constituting the metal bonding layer 200 represents a metal element, for example, a single metal element such as NiCo, Ni, Co, or a combination of two or more thereof. The metal bonding layer 200 of this embodiment is integrally laminated so as to cover the surface of the blade main portion 71 and the surface of the platform portion 72 connected to the blade main portion 71 have. The metal bonding layer 200 of the present embodiment has a film thickness of about 0.05 mm to 0.2 mm.

The ceramic layer 300 is a top coat layer formed by spraying the sprayed particles toward the surface of the rotor 7 on which the metal bonding layer 200 is formed. The ceramic layer 300 has a dense vertical crack C extending in the thickness direction of the ceramics layer 300 and dispersed in the surface direction of the surface and containing a plurality of pores P, ) Coating. In the ceramics layer 300 of the present embodiment, the distribution of the longitudinal cracks C per 1 mm is dispersed at a pitch of 0.5 / mm to 40 / mm or less, and the porosity falls within a range of 4% to 15% Respectively. The ceramic layer 300 is formed to a thickness of about 0.2 mm to 1 mm.

The ceramic layer 300 is formed such that the distribution of the longitudinal cracks C per 1 mm is dispersed at a pitch of 1 / mm to 6 / mm or less and the porosity is in the range of 9% to 15% desirable. Particularly, the ceramic layer 300 is formed such that the distribution of the longitudinal cracks C per 1 mm is dispersed at a pitch of 1 / mm to 2 / mm or less, and the porosity is in the range of 9% to 10% Is more preferable.

The porosity in the present embodiment is not only the occupancy rate of the pores P per unit volume but also the occupancy rate of the longitudinal cracks C and pores. Therefore, if the porosity of the ceramics layer 300 of the present embodiment is not less than 5%, the porosity of the ceramics layer 300 of the present embodiment is not less than 5% 7% or less.

The sprayed particles forming the ceramic layer 300 are made of YbS (zirconia stabilized zirconia) which is ZrO ₂ partially stabilized by Yb ₂ O ₃ . The sprayed particles in this embodiment are YbSZ having a particle size distribution in which the 50% particle size distribution of the integrated particle size distribution is 40 占 퐉 or more and 100 占 퐉 or less.

When the particle diameter of the sprayed particles becomes too large and becomes larger than 100 占 퐉 as shown in Fig. 4 (a), it is necessary to set the 50% particle size distribution 50% particle diameter to a spraying path The number is increased remarkably, and it becomes difficult to actually manufacture them. As shown in FIG. 4B, if the particle size of the sprayed particles exceeds 50% of the particle size distribution of the total particle size of 100 μm, the vertical cracks C become difficult to enter into the ceramic layer 300, It is also because it is degraded.

If the particle diameter is too small and the integrated particle size distribution becomes smaller than 50% particle diameter 40 占 퐉, the ceramic layer 300 becomes dense and the porosity is lowered. As a result, as shown in Fig. 4C, the thermal conductivity of the ceramic layer 300 is increased, and the heat shielding property is lowered.

The integrated particle size distribution in the present embodiment is a value indicating the size of the powder, that is, the particle as the aggregate. The cumulative particle size distribution is a distribution of a plurality of measurement results as a ratio of existence ratios per particle diameter. The cumulative particle size distribution 50% particle size is also called the median diameter. Cumulative particle size distribution 50% particle diameter is a particle diameter in which the larger side and the smaller side are the same amount when the powder is divided into two from the particle diameter.

The distribution of the abundance ratio of the sprayed particles for each particle diameter can be measured using, for example, a laser scattering trough size distribution measuring apparatus or the like.

In the ceramics layer 300 constituted by the YbSZ, the addition ratio of Yb ₂ O ₃ as stabilizer becomes 2% by weight or more as the addition amount of Yb ₂ O ₃ , so that the thermal cycle durability begins to improve. This effect effectively works up to just before the addition amount of 35% by weight. In terms of heat cycle durability, the thermal cycle test is carried out using the apparatus shown in Fig. 7 or 8 of Japanese Patent No. 4388466, for example. The effective addition amount of Yb ₂ O ₃ seen from this heat cycle durability is 4 wt% or more and 30 wt% or less. If the added amount of Yb ₂ O ₃ is in the range of 8 wt% or more and 27 wt% or less, the heat-resistant coating 100 of the present embodiment can exhibit more excellent heat cycle durability. When the addition amount of Yb ₂ O ₃ exceeds the above range, the thermal cycle durability is lowered. This is because if the addition amount is less than 8% by weight, the amount of the monoclinic phase (m-phase) remaining in the ceramics layer 300 increases, durability lowers, and if it exceeds 25% by weight , The ceramics layer 300 tends to be tetragonal and durability is lowered because the ratio of t 'phase having excellent durability is lowered.

The amount of Yb ₂ O ₃ added is more preferably 10 wt% or more and 25 wt% or less, and most preferably 12 wt% or more and 20 wt% or less. By controlling the amount added to these ranges, it is possible to obtain a heat shielding coating 100 having further excellent heat cycle durability.

Next, a method of manufacturing a heat-shielding coating for laminating the heat-shielding coating 100 on the surface of the rotor 7 will be described.

2, the rotor 7 is fixed on the jig 91 and the surface of the rotor 7 is sprayed with the spray gun 92 by the spray gun 92 . The method for producing a heat shielding coating according to the present embodiment includes a metal bonding layer forming step of forming a metal bonding layer 200 on the surface of a rotor blade 7 and a step of forming a ceramic layer 300 on the metal bonding layer 200 And a step of forming a ceramic layer.

In the metal bonding layer forming step, a metal spray layer is sprayed on the surface of the rotor 7 provided on the jig 91 to form the metal bonding layer 200. The metal bonding layer forming step of the present embodiment is performed on the surface of the blade main body portion 71 of the rotor 7 and the surface of the platform portion 72 on the side to which the blade main portion 71 is connected. In the metal bonding layer forming step, for example, the metal sprayed layer of the MCrAlY alloy is sprayed on the surface of the rotor 7 by the spray gun 92 by the atmospheric plasma spraying method to form the metal bonding layer 200 .

In the ceramic layer forming step, the ceramic layer 300 is formed by spraying the YbSZ sprayed particles from the metal bonding layer 200 formed in the metal bonding layer forming step toward the surface of the rotor 7. The ceramic layer forming step of the present embodiment is a step of forming on the metal bonding layer 200 formed on the surface of the rotor blade 7 a YbSZ having a particle size distribution such that the particle size distribution is 50% The sprayed particles are sprayed by an atmospheric pressure plasma spraying method to form the ceramic layer 300. The ceramic layer forming step is preferably carried out by setting the output of the spray gun 92 at a current of 500 A to 800 A and a voltage of 55 V to 70 V, for example. The spraying distance, which is the distance between the outlet of the spray gun 92 and the surface sprayed with the sprayed particles, has a dense structure having the longitudinal cracks C necessary for ensuring sufficient durability, In order to obtain the ceramics layer 300 having a porous structure including the pores P, it is preferably set to be not more than 80 mm from the minimum distance required for spraying, and more preferably not more than 70 mm. In the ceramics layer forming step of the present embodiment, for example, the spraying distance is set to 70 mm.

The sprayed particles made of YbSZ used in the present embodiment can be produced by the following procedure.

As shown in FIG. 5, in the method for producing a sprayed particle made of YbSZ, a ZrO ₂ powder and a Yb ₂ O ₃ powder having a predetermined addition ratio are prepared (first steps S 11 and S 12). These prepared powders are kneaded together with an appropriate binder or dispersant in a ball mill to prepare a slurry (second step S20). Next, the prepared slurry is dried in a particle shape by a spray dryer (third step S30). Dried, and solidified by a diffusion heat treatment which is heated to 1200 to 1600 캜 (fourth step S40). With these, sprayed particles composed of YbSZ having a particle size distribution with a cumulative particle size distribution of 50% particle diameter of 40 占 퐉 to 100 占 퐉 are obtained.

According to the heat shielding coating 100 or the method of producing the heat shielding coating as described above, the ceramic layer 300 is formed by the sprayed particles made of YbSZ having an integrated particle size distribution 50% particle size of 40 m or more and 100 m or less. When these ceramic particles are sprayed on the rotor 7 and the ceramic layer 300 is formed, the surface remains melted and the core remains unmelted. Therefore, in the ceramics layer 300, a dense structure is formed by the surface of the molten sprayed particles, and a partially porous structure is formed by the core of the remaining sprayed particles.

Concretely, as shown in the examples of the following Table 1 and the enlarged photograph of FIG. 6, the longitudinal cracks C are dispersed in the surface direction at a pitch of 1 / mm to 2 / mm or less, and the longitudinal cracks per unit volume The ceramic layer 300 having a porosity of about 9 to 10%, which is the occupation ratio of the porosity C and the porosity P, can be formed.

Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Spray particles YbSZ YbSZ YSZ YSZ (D50) [占 퐉] 70 30 41 40 Micro-organization Porosity [%] 9-10 8 8 10 Vertical crack pitch [number / mm] 1-2 2 to 40 0.8 to 79 No vertical cracks Thermal Conductivity * 1.2 to 1.5 1.6 to 1.8 2 One Thermal cycle durability * 1.5 1.5 1.3 One High Temperature Iroelectric Properties * 0.3 0.28 0.3 One

* Based on Comparative Example 3, the ratio is shown.

On the other hand, in the same YbSZ as in Comparative Example 1 in Table 1, in the ceramic layer formed by spraying the sprayed particles composed of YbSZ having a cumulative particle size distribution of 50% and a particle size of 30 占 퐉, the longitudinal cracks C Is dispersed at a pitch of not less than 40 pieces / mm and not more than 8%, which is the occupancy ratio of the longitudinal cracks (C) per unit volume and the pores (P). That is, in the sprayed particles made of YbSZ having a cumulative particle size distribution 50% particle size of 40 m or less, the longitudinal cracks C are dispersed at a pitch of 1 / mm to 2 / mm or less in the plane direction, It is difficult to obtain the ceramic layer 300 having a texture of about 10% to about 10%.

As in the embodiment of Table 1, the characteristics of the ceramic layer 300 formed by the sprayed particles made of YbSZ having a 50% cumulative particle size distribution of 70 mu m were such that the ratio of the thermal conductivity (for Comparative Example 3) was 1.2 to 1.5, The ratio of heat cycle durability (for Comparative Example 3) is about 1.5. This characteristic is superior to the characteristics of the ceramic layer formed by the sprayed particles made of YbSZ having the integrated particle size distribution 50% particle size of 30 mu m as clearly shown in comparison between the embodiment of Table 1 and the comparative example 1 . That is, the thermal conductivity of the ceramic layer 300 of the embodiment is smaller than the ratio of the thermal conductivity of the ceramic layer 300 of Comparative Example 1 of 1.6 to 1.8, and it is found that the thermal conductivity of the ceramics layer 300 of the embodiment is high. It can be seen that the ratio of the thermal cycle durability of the ceramic layer 300 of Comparative Example 1 to the thermal cycle durability of the ceramic layer 300 of the Example is equal and sufficient durability is ensured in the ceramics layer 300 of the embodiment .

Therefore, by forming the ceramic layer 300 with the sprayed particles made of YbSZ having a cumulative particle size distribution 50% particle diameter of 40 占 퐉 or more and 100 占 퐉 or less, a dense structure having the longitudinal cracks C necessary for ensuring sufficient durability And a porous structure including a pore P in an amount necessary for securing heat insulating property can be obtained. As a result, the heat shield coating 100 of the present embodiment can improve the heat shielding property while ensuring sufficient durability.

Since the ceramic layer 300 is formed such that the longitudinal cracks C are dispersed in the surface direction at a pitch of 0.5 / mm or more and 40 / mm or less and the porosity is 4% or more and 15% or less, sufficient durability is ensured The ceramic layer 300 having improved heat resistance can be obtained with high accuracy. Since the ceramic layer 300 is formed such that the longitudinal cracks C are dispersed in the surface direction at a pitch of 1 / mm or more and 6 / mm or less and the porosity is 9% or more and 15% or less, Can be obtained. Particularly, since the ceramic layer 300 is formed such that the longitudinal cracks C are dispersed in the surface direction at a pitch of 1 / mm or more and 2 / mm or less and the porosity is 9% or more and 10% or less, The ceramic layer 300 having improved heat resistance can be obtained with higher accuracy. Particularly, since the ceramic particles 300 are formed of the YbSZ sprayed particles, a higher performance ceramic layer 300 can be obtained.

Specifically, as in Comparative Example 2 in Table 1, it is assumed that the longitudinal cracks C are dispersed in the surface direction at a pitch of not less than 1 / mm and not more than 2 / mm by the sprayed particles made of YSZ instead of YbSZ , Sufficient heat resistance can not be obtained. For example, since the thermal conductivity of the ceramics layer 300 of the embodiment is smaller than the thermal conductivity of the ceramic layer 300 of the comparative example 2, the ceramics layer 300 of the comparative example 1 has the same heat conductivity as the ceramics layer 300 of the embodiment Can not be obtained.

As in Comparative Example 3 of Table 1, assuming that the thermal cycle durability is 1 (base) when the porosity is about 10% by the porous structure having no longitudinal cracks (C), the comparison with the same YSZ as the sprayed particles The ratio of the thermal cycle durability of Example 2 is lower than that of 1.3. The heat cycle durability of Comparative Example 3 is lower than that of the thermal cycling durability ratio 1.5 of the embodiment having YbSZ as the thermal sprayed layer and the longitudinal crack (C) and the thermal cycle durability ratio 1.5 of Comparative Example 1 Able to know.

Therefore, a structure in which the longitudinal cracks C are dispersed in the plane direction at a pitch of not less than 1 / mm and not more than 2 / mm or a ceramic layer 300 formed of YSZ sprayed particles having a simple porosity of about 10% , The ceramics layer 300 of the present embodiment can achieve higher performance.

As is clear from comparison between the Examples and Comparative Examples 1 to 3, it can be seen that the high temperature fly ash characteristics exhibiting the friction characteristics under the high temperature environment at the TBC surface temperature of 1100 캜 can exhibit high performance. Therefore, it is possible to secure internal resistance.

The ceramic layer 300 can be formed by the sprayed particles composed only of YbSZ containing substantially no impurities such as polyester resin or acrylic resin. Therefore, it is possible to include a pore (P) in an amount necessary for improving the heat shielding property in the dense structure having the longitudinal cracks (C) without performing thermal treatment or the like after the spraying. Therefore, the heat shielding coating 100 having improved heat resistance can be obtained with a small number of steps while ensuring sufficient durability.

According to the rotor blade 7, which is a turbine member in the above-described embodiment, it can be suppressed from being exposed to high temperature for a long period of time and being damaged. It is possible to extend the maintenance cycle, so that the frequency of stopping the gas turbine 1 can be reduced.

Although the embodiments of the present invention have been described above with reference to the drawings, it is to be understood that the present invention is not limited to the details of the embodiments and combinations thereof, and may be modified without departing from the scope of the present invention. , Substitutions, and other modifications are possible. Further, the present invention is not limited to the embodiments, but is limited only by the claims.

Further, the metal bonding layer 200 or the ceramic layer 300 may be formed by a method other than this embodiment mode. For example, decompression plasma spraying may be used as electric spraying other than atmospheric plasma spraying, and frame spraying or high speed frame spraying may be used as gas spraying. But it may be formed by a method other than the spraying method, for example, an electron beam physical vapor deposition method may be used.

The metal bonding layer 200 or the ceramic layer 300 is not limited to being formed to have the same film thickness over the whole area as in the present embodiment, and may be suitably set in accordance with conditions such as the environment used.

In the present embodiment, the rotor 7 is described as an example of the turbine member, but the present invention is not limited thereto. For example, the turbine member may be the stator 8.

In the ceramics layer forming step of this embodiment, the output of the spray gun 92 is set to a current of 500 A to 800 A, a voltage of 55 V to 70 V, and a spray distance of 70 mm, but the present invention is not limited to this condition. Therefore, in the ceramics layer forming step, the ceramic layer 300 is formed such that the longitudinal cracks C are dispersed at a pitch of 0.5 / mm or more and 40 / mm or less in the plane direction and the porosity is 9% or more and 15% And the conditions such as the output or the spraying speed may be changed.

According to the heat-generating coating (100) and the method of producing the heat-shielding coating described above, by using the sprayed particles composed of YbSZ having a particle size distribution in which the 50% particle size of the integrated particle size distribution is 40 μm or more and 100 μm or less, sufficient durability , It is possible to improve the heat resistance.

1: gas turbine 2: compressor
3: Combustor 4: Turbine body
5: Rotor A: Compressed air
G: Combustion gas 6: Casing
7: rotor 71: wing body part
72: platform part 8: stator
100: heat shield coating 200: metal bonding layer
300: Ceramic layer C: Vertical crack
P: pore 91: jig
92: gun gun S11, S12: first process
S20: Second Step S30: Third Step
S40: Fourth step

Claims (8)

A heat-resistant alloy base material used for a turbine member,
And a ceramic layer formed on the heat resistant alloy base material, wherein the longitudinal crack extending in the thickness direction is dispersed in the surface direction and includes a plurality of pores therein,
Sprayed particles made of YbSZ having a particle size distribution of 50 占 퐉 or more and a particle size distribution of 40 占 퐉 or more and 100 占 퐉 or less are sprayed at a spraying distance of 80 mm or less and the longitudinal cracks are sprayed at a rate of 0.5 / And the porosity of the ceramics layer is 4% or more and 15% or less in total of the longitudinal cracks and the pores
Thermal coating. A heat-resistant alloy base material used for a turbine member,
And a ceramic layer formed on the heat resistant alloy base material, wherein the longitudinal crack extending in the thickness direction is dispersed in the surface direction and includes a plurality of pores therein,
Sprayed particles composed of YbSZ having a particle size distribution of 50 占 퐉 and a particle size distribution of 40 占 퐉 or more and 100 占 퐉 or less are sprayed at a spraying distance of 80 mm or less and the longitudinal cracks are sprayed at a rate of 1 / Or less and the porosity of the longitudinal cracks and the pores is not less than 9% and not more than 15%
Thermal coating. A heat-resistant alloy base material used for a turbine member,
And a ceramic layer formed on the heat resistant alloy base material, wherein the longitudinal crack extending in the thickness direction is dispersed in the surface direction and includes a plurality of pores therein,
Sprayed particles made of YbSZ having a particle size distribution of 50 占 퐉 or more and a particle size distribution of 40 占 퐉 or more and 100 占 퐉 or less are sprayed at a spraying distance of 80 mm or less and the longitudinal cracks are sprayed at a rate of 1 / Or less and the porosity of the longitudinal cracks and the pores is in a range of 9% to 10%
Thermal coating. A method for producing a heat-sensitive coating according to any one of claims 1 to 3
Turbine member. A turbine comprising the turbine member according to claim 4
Gas turbine. A sprayed particle made of YbSZ having a particle size distribution in which the particle size distribution of the 50% cumulative particle size distribution is 40 占 퐉 or more and 100 占 퐉 or less is sprayed on the heat resistant alloy base material used for the turbine member at a spraying distance of 80 mm or less, Wherein the longitudinal cracks are dispersed in the surface direction and the longitudinal cracks are dispersed in the surface direction at a pitch of 0.5 / mm or more and 40 / mm or less and have a plurality of pores therein, and the porosity ratio of the longitudinal cracks and the pores is 4 To 15% or less of a ceramic layer
A method of making a thermal barrier coating. The sprayed particles made of YbSZ having a particle size distribution in which the particle size distribution of the 50% cumulative particle size distribution is 40 占 퐉 or more and 100 占 퐉 or less are sprayed on the heat resistant alloy base material used for the turbine member at a spraying distance of 80 mm or less, Wherein the longitudinal cracks are dispersed in the surface direction and the longitudinal cracks are dispersed in the surface direction at a pitch of 1 / mm or more and 6 / mm or less and have a plurality of pores therein, and the porosity of the longitudinal cracks and the pores is 9 To 15% or less of a ceramic layer
A method of making a thermal barrier coating. A sprayed particle made of YbSZ having a particle size distribution in which the particle size distribution of the 50% cumulative particle size distribution is 40 占 퐉 or more and 100 占 퐉 or less is sprayed on the heat resistant alloy base material used for the turbine member at a spraying distance of 80 mm or less, Wherein the longitudinal cracks are dispersed in the plane direction and the longitudinal cracks are dispersed in the surface direction at a pitch of 1 / mm or more and 2 / mm or less and have a plurality of pores therein, and the porosity of the longitudinal cracks and the pores is 9 And a ceramic layer forming step of forming a ceramic layer of at least 10%
A method of making a thermal barrier coating.

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