KR102054373B1 - The Structure coated environmental barrier coating material and the method of coating the environmental barrier coating material - Google Patents

Abstract

An embodiment of the present invention includes a base material and an environmental coating material coated on the surface of the base material, wherein the environmental coating material is coated with an environmental coating material, which is a sintered body sintered by adding 12 wt% or more of rare earth oxide powder to mullite powder Start the structure.

Description

The structure coated environmental barrier coating material and the method of coating the environmental barrier coating material}

The present invention relates to a structure coated with an environmentally-resistant coating material and a method for coating the environmentally-resistant coating material.

In order to be used as a gas turbine heat shield material, nuclear power component material, and aerospace component material, mechanical properties such as high thermal properties and high strength are required. Among the Si-based ceramics, silicon carbide (SiC) and silicon nitride (Si3N4) ceramic mixes have excellent mechanical properties such as thermal properties, abrasion resistance, high strength, and high hardness, which are applicable at high temperatures such as heat resistance, thermal shock resistance, low thermal expansion, and high thermal conductivity. Since it has radiation resistance, it attracts attention as a material of the said component.

However, Si-based ceramics have a disadvantage in that oxidation occurs at a high temperature, and in particular, the reaction of water vapor and Si occurs to reduce mass due to corrosion by steam erosion.

An object of the present invention is to provide a high temperature and corrosion resistant environmental coating material (Environmental barrier coatings) and the environmental coating material coated on the Si-based ceramics in order to block the path where the Si-based ceramics and water vapor meets the reaction To provide a method of coating.

One embodiment of the present invention includes a base material and an environmental coating material coated on the surface of the base material, wherein the environmental coating material is coated with an environmental coating material, which is a sintered body sintered by adding 12 wt% or more of rare earth oxide powder to mullite powder Start the structure.

In this embodiment, the environmentally resistant coating material may be coated in a single layer on the surface of the base material.

In the present embodiment, the base material may be made of a fiber-reinforced composite material (SiCf-SiC) which is a composite material using the fiber as a reinforcing material.

In the present embodiment, the fiber reinforced composite material may be any one of fiber reinforced plastic (FRP), fiber reinforced metal (FRM), fiber reinforced ceramic (FRC), fiber reinforced concrete (FRC).

In the present embodiment, it may further comprise a silicon (Si) layer provided between the base material and the environmental coating material.

In the present embodiment, the base material may be a substrate made of any one of engineering ceramics, single crystal or heat resistant alloy.

In the present embodiment, the engineering ceramics may be any one of alumina, zirconia, silicon carbide, silicon nitride or yttria.

In the present embodiment, the rare earth oxide may be yttria (Y 2 O 3).

In the present embodiment, the rare earth oxide may be yttrium silicate (Y 2 SiO 5).

In the present embodiment, the rare earth oxide may be ytterbium (Yb 2 O 3) oxide.

In the present embodiment, the rare earth oxide may be ytterbium silicate (Yb 2 SiO 5).

In the present embodiment, the material of the fiber may be any one of metal, glass, carbon, ceramic, organic material (artificial and natural).

In the present embodiment, the environmentally resistant coating material may be formed by sintering mullite powder to which rare earth oxide powder is added at a temperature of 1600 ° C. or higher.

In another embodiment of the present invention, by mixing yttria (Y 2 O 3) and silicon oxide (SiO 2) to form a yttrium silicate (Y 2 SiO 5) powder, 12 wt% or more of the yttrium silicate (Y 2 SiO 5) powder is added to the mullite powder. And mixing the yttrium silicate (Y 2 SiO 5) powder and the mullite powder at least 12 wt% and then sintering the mixed yttrium silicate (Y 2 SiO 5) powder and mullite powder to coat an environmental coating material on one surface of the base material. A method of coating an environmentally resistant coating is disclosed.

In the present embodiment, the step of sintering the mixed yttrium silicate (Y 2 SiO 5) powder and the mullite powder may include heating at a temperature of 1600 ° C. or more for 10 hours or more.

In the present embodiment, the step of sintering the mixed yttrium silicate (Y 2 SiO 5) powder and the mullite powder may include heating at a temperature of 1700 ° C. or more for 3 hours or more.

In the present embodiment, the mixing of the yttria (Y 2 O 3) and the silicon oxide (SiO 2) and the mixing of the mullite powder and the yttrium silicate (Y 2 SiO 5) powder are performed by a ball milling process. Can be.

In still another embodiment of the present invention, the step of mixing the ytterbium (Yb 2 O 3) and silicon oxide (SiO 2) to form a ytterbium silicate (Yb 2 SiO 5) powder, more than 12wt% in the mullite powder Adding the ytterbium silicate (Yb2SiO5) powder and mixing the ytterbium silicate (Yb2SiO5) powder with the mullite powder at least 12 wt%, and then mixing the ytterbium silicate (Yb2SiO5) powder (Yb 2 SiO 5) and the mullite powder may include the step of coating the environmental coating on one surface of the base material.

According to an embodiment of the present invention, the structure coated with the environmentally-resistant coating material has a favorable effect in preventing the penetration of water vapor and plasma while well withstanding high temperature.

As a result, there is an advantageous effect that the environmental coating material is not easily peeled off and the durability and lifespan of the environmental coating material and the structure are effectively improved.

In addition to the above-described contents, the effects of the present invention can be derived from the contents described below with reference to the drawings.

1 is a schematic cross-sectional view showing a gas turbine high temperature part coated with an environmentally-resistant coating material according to an embodiment of the present invention.
2A and 2B are graphs based on experimental results, and FIG. 2A shows a density change of the environmentally-resistant coating material 100 containing yttrium silicate (Y2SiO5) powder in a mullite powder in a mass ratio of yttrium silicate (Y2SiO5) powder. 2b is a graph showing the density change of the environmentally resistant coating material 100 including the mullite powder and the ether [ether] bium silicate (Yb2SiO5) powder, and the ytterbium silicate (Yb2SiO5) powder. It is a graph shown according to the mass ratio of.
3A to 3C are SEM photographs, and each of FIGS. 3A to 3C is 100 wt% of mullite, 12 wt% of mullite + yttrium silicate (Y 2 SiO 5), and 12 wt% of sintered mullite + ytterbium silicate (Yb 2 SiO 5).

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. Effects and features of the present invention, and methods of achieving them will be apparent with reference to the embodiments described below in detail together with the drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals, and redundant description thereof will be omitted. .

In the following embodiments, the terms first, second, etc. are used for the purpose of distinguishing one component from other components rather than having a limiting meaning.

In the following examples, the singular forms “a”, “an” and “the” include plural forms unless the context clearly indicates otherwise.

In the following examples, the terms including or having have meant that there is a feature or component described in the specification and does not preclude the possibility of adding one or more other features or components.

In the following embodiments, when a part of a film, a region, a component, etc. is said to be "on" or "on" another part, not only when it is directly above another part, but also in the middle of another film, area, composition It also includes the case where an element etc. are interposed.

In the drawings, components may be exaggerated or reduced in size for convenience of description. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and thus the present invention is not necessarily limited to the illustrated.

In the case where an embodiment may be implemented differently, a specific process order may be performed differently from the described order. For example, two processes described in succession may be performed substantially simultaneously or in a reverse order.

1 is a schematic cross-sectional view showing a gas turbine high temperature part coated with an environmentally-resistant coating material according to an embodiment of the present invention.

In addition, FIG. 1 schematically shows a cross-sectional view of a part of a turbine component that is a base material 10 coated with an environmentally-resistant coating material 100.

A gas turbine is a rotary heat engine that operates a turbine with high temperature, high pressure combustion gases, and may include an air compressor, a combustion chamber, a turbine, and the like as shown in FIG. 1 as a basic element. The gas turbine compresses the air with an air compressor and directs the compressed air to the combustion chamber where the fuel is dispersed and combusted. The turbine is rotated by expanding the high-temperature and high-pressure gas generated at this time while blowing out the turbine. Normally, the air compressor and turbine are connected directly or indirectly to one axis (output shaft). The power to operate the air compressor uses 25-30% of the output from the turbine. Therefore, the output of rotating the generator, propeller, etc. with the gas turbine is the output generated from the turbine minus the output required to operate the air compressor.

As described above, since gas turbines operate under high temperature conditions, components for turbines may be formed of materials such as silicon nitride (Si 3 N 4) or silicon carbide (SiC) having excellent thermal properties at high temperatures.

However, the gas turbine (gas turbine) is exposed to high temperature, high pressure gas, water vapor, as well as high temperature conditions there is a concern that the durability and life of the turbine components under such an environment is reduced.

Therefore, the structure 1000 coated with the environmentally-resistant coating material according to the present embodiment includes a gas turbine high temperature part that becomes the base material 10 and an environmentally-resistant coating material 100 coated on the part, so that durability and lifespan are efficient. There is an advantageous effect that can be improved.

Materials and mass ratios of the materials constituting the environmentally-resistant coating material 100 according to the present embodiment will be described in detail later.

1 illustrates a gas turbine component as an embodiment, but the present invention is not limited thereto, and the structure 1000 coated with the environmentally-resistant coating material of the present invention may be a nuclear component, a semiconductor component, etc., which becomes a base material 10. It may include a variety of parts and environmental coating material 100 is coated on the parts to protect the parts.

That is, the structure 1000 coated with an environmentally-resistant coating material according to the present embodiment is coated on the base material 10 such as nuclear components, semiconductor components, etc., in which the environmental-resistant coating material 100 is easily exposed to an environment of high temperature, steam, or plasma. By reducing the area of the pores through which water vapor or plasma can penetrate and isolating the pores to block the ingress of water vapor or plasma, there is an advantageous effect that the durability and lifespan of the structure can be effectively improved ultimately. .

In an alternative embodiment, the environmentally-resistant coating material 100 may be coated on one surface of the base material 10 to form a structure 1000 coated with the environmentally-resistant coating material.

As another optional embodiment, the environmentally-resistant coating material 100 may be coated on the surface of the base material 10 to form the structure 1000 coated with the environmentally-resistant coating material.

The base material 10 may be made of a fiber-reinforced composite material (SiCf-SiC), which is a composite material using fibers as a reinforcement material.

In an alternative embodiment, the material of the fiber may be any one of metal, glass, carbon, ceramic, organic matter (artificial and natural).

A composite material is a material in which materials of different kinds are mated together and have characteristics that cannot be obtained with a single material. Unlike materials consisting of one material, the microstructure of a composite material is not constant, not continuous, and is a multiphase state of two or more phases.

The composite material can consist of two phases. One of the two is called the matrix and the other is called the dispersed phase. The matrix is continuous and encompasses the disperse phase, the nature of the composite being related to the phases that make up the material, their magnification, and the geometry of the disperse phase. The geometric structure of the dispersed phase may include the shape of the particles and the size, distribution, orientation, etc. of the particles.

Fiber-reinforced composites (SiCf-SiC) are like fibers in which the geometrical structure of the dispersed phase is large in length and diameter ratio. Fiber-reinforced composites (SiCf-SiC) are divided into two groups: the fibers are continuous and the fibers are short.

The fiber reinforced composite material (SiCf-SiC) may be carbon fiber. Carbon fibers can be made by heating organic fibers to 700 to 1800 ° C in a stream of nitrogen. The fibers can be carbonized to crystallize and become light and durable.

Carbon fiber varies in quality and performance depending on the raw materials. There are two broad categories: PAN (polyacrylonitrile) and pitch (petroleum and coal to aromatic hydrocarbons). Moreover, it classifies by mechanical characteristic values, such as tensile strength and an elastic modulus. It is divided into low modulus, high modulus, low strength and high strength net. Usually, high elasticity and high strength are called high performance (HP = high performance) carbon fibers, and low elasticity and low strength are called general performance (GP = general performance) carbon fibers.

That is, carbon fibers are superior in physical properties such as specific strength, inelasticity, and heat resistance to other types of fibers, and have an advantageous effect of making a lightweight, high strength, high elastic composite.

Fiber-reinforced composites (SiCf-SiC) may include various types depending on the matrix.

In an alternative embodiment, the fiber reinforced composite material (SiCf-SiC) may be any one of fiber reinforced plastic (FRP), fiber reinforced metal (FRM), fiber reinforced ceramic (FRC), fiber reinforced concrete (FRC).

Fiber-reinforced plastics (FRP) is to supplement the shortcomings, such as the general plastic is weak strength or poor heat resistance by combining with fibers such as carbon fiber, Kevlar, glass fiber (glass fiber).

Fiber-reinforced metal (FRM) is a ceramic fiber that can withstand high temperatures and high tensile strength, such as alumina (Al2O3) or silicon carbide (SiC), in relatively light metals such as aluminum (Al), titanium (Ti), magnesium (Mg), etc. It may be a high temperature high strength composite material composited with. In one embodiment, the fiber reinforced metal may be used to make engines for automobiles, turbines for jet engines, etc., operating at high temperatures.

Fiber-reinforced ceramic (FRC) is a ceramics composite with excellent thermal and structural properties and can be used as a cutting edge material for aerospace high temperature environments. Ceramic composite materials are prepared by dispersing particles, whiskers or fibers therein in order to improve the properties of a single ceramic material (Monolithic ceramic). Such composites can improve the low fracture toughness of ceramic substrates through control of reinforcing fiber arrays or fiber / base interfaces and bonding properties.

In an alternative embodiment, the base material 10 may be a substrate made of any one of engineering ceramics, single crystal, or heat resistant alloy.

Engineering ceramics may be ceramics that utilize mechanical, thermal, and chemical properties, except for electronic ceramics. Engineering ceramics can optionally be used in automotive engine parts, industrial machine parts, heat and chemical resistant parts, and biomaterials. Engineering ceramics have an advantageous effect with high strength, hardness, heat resistance, corrosion resistance and thermal shock resistance.

In an alternative embodiment, the engineering ceramics can be any one of alumina (Al 2 O 3), zirconia (ZrO 2), silicon carbide (SiC), silicon nitride (Si 3 N 4) or yttria (Y 2 O 3).

Alumina or aluminum oxide is a compound that is a two-component compound of oxygen and aluminum that is naturally produced as corundum in nature. Alumina (Al 2 O 3) is a white powder having a molecular weight of 101.96, specific gravity of 3.965, and melting point of 2072 ° C., and having a hexagonal crystal structure (a = 4.758, c = 12.991 kPa). Most alumina can be manufactured through Bayer process using bauxite mineral as a raw material. Wear resistance, spark plugs, insulators, abrasives, refractory materials, ceramic tiles, glass, cutting tools, biomaterials, catalyst carriers, filters, heat exchanger components, refractory materials, resins, etc. It is widely used in fillers, fibers, and the like.

Zirconia (ZrO2) has the best mechanical strength at room temperature and has low thermal conductivity among engineering ceramics. In addition, it is a material that has high toughness and overcomes badness, which is a weak point of ceramics.

Silicon carbide (SiC) is a covalently bonded ceramic and harder than alumina. Especially high temperature strength and corrosion resistance. Due to its high hardness, it is also resistant to sliding corrosion.

Since silicon nitride (Si3N4) is a covalently bonded high heat resistant material (decomposition temperature of 1880 ° C), it can be used as a high temperature structural material using high temperature and high strength properties. In addition, since it has excellent thermal shock resistance and maintains high strength from room temperature to high temperature, it can be used as a ceramic turbine or an engine material, and also wear-resistant parts such as bearings for applications requiring heat resistance and corrosion resistance, and mechanical parts of steel plant. It can be used as a molten metal corrosion resistant part of non-thermal metals such as alumina and the like.

Yttria is an oxidation of yttria that can be used to make the shell of an incandescent gas. The melting point of yttria (Y2O3) is 2,410 ° C. It is used as a coating material for electron-fed filaments and as a raw material for fluorescent materials, laser materials, and magnetic materials. It is a thermally stable colorless crystal.

As shown in FIG. 1, the turbine component may be a structure 1000 in which an environment-resistant coating material 100 is coated on a base material 10. Hereinafter, the composition and composition ratio of the environmentally-resistant coating material according to the present embodiment will be described in detail.

In an alternative embodiment, the environmentally-resistant coating material 100 may be coated on the surface of the base material 10 and may be coated in a single layer. That is, the environmentally-resistant coating material 100 consisting of one layer may be coated to cover the base material 10.

In another optional embodiment, the structure 1000 coated with the environmentally-resistant coating material 100 may further include a silicon (Si) layer provided between the base material 10 and the environmental-resistant coating material 100.

As an optional embodiment, the environmentally-resistant coating material 100 may be formed by adding 12 wt% or more of rare earth oxide powder to mullite powder.

In an alternative embodiment, the environmentally-resistant coating material 100 may be formed by adding at least 12 wt% of a rare earth oxide powder to a mullite powder.

Mullite is a silica and alumina-based refractory, and has a composition of 3Al 2 O 3 · 2 SiO 2, and can withstand high temperatures of 1800 ° C. or higher, and thus has high temperature strength. Accordingly, mullite may be used as a raw material of the environmentally-resistant coating material 100 according to the present embodiment.

Mullite is the only one of the two components, silica and alumina, which is present in a stable state at atmospheric pressure, and is a major crystal phase constituting porcelain or clay refractory materials. That is, mullite is a compound of aluminum oxide and silicon oxide, which forms columnar crystals and is stable even at high temperature and high pressure.

High purity mullite having high temperature strength may be synthesized by various methods such as sol-gel, alkoxide, and coprecipitation.

Mullite consists essentially of acicular mullite particles (ie acicular mullite crystals) that are chemically bonded to one another. Mullite preferably contains a sufficient amount of particles not only to filter particulate matter from the exhaust gas, but also to resist damage during the regeneration cycle.

As an optional embodiment, mullite may have any porosity.

The mullite particles may comprise at least about 80%, at least about 85%, or at least about 90% by volume of Mullite. The mullite particles may comprise up to about 99 volume percent, up to about 98 volume percent, or up to about 97 volume percent of the composition.

Mullite may contain, in addition to mullite particles, a glassy phase consisting of metals in the form of silica, alumina and oxide. The glassy phase is usually located at the mullite particle surface and at the intersecting particle surface.

The diameter (eg, spherical cross-sectional length) of the particles (eg, needles, fibers, crystals, or a combination thereof) may vary throughout the acicular mullite object or may vary between the mullite object and the mullite object.

The acicular mullite object may consist of only small particles. The acicular mullite object may consist of only large particles. The acicular mullite object may consist only of particles of medium size. Preferably, the acicular mullite object may comprise both large particles and medium particles. More preferably, the acicular mullite object may comprise mainly small particles and medium particles.

Mullite objects can have strength. The strength of the mullite object is preferably such that the mullite object has a porosity high enough to remove particulates and is not damaged during vibration and repeated thermal cycles.

The environmentally-resistant coating material 100 according to the present embodiment is to reduce the porosity of the mullite (Mullite) described above, that is, to reduce the area of the pores (Pore) through which water vapor or plasma can penetrate, and to isolate the pores of water vapor or plasma. Rare earth oxide powders may be included to block intrusion.

FIG. 2A is a graph showing the density change of the environmentally-resistant coating material 100 including yttrium silicate (Y2SiO5) powder among rare earth oxides in mullite powder according to the mass ratio of yttrium silicate (Y2SiO5) powder, and FIG. The density change of the environmentally-resistant coating material 100 containing the ytterbium silicate (Yb2SiO5) powder among the rare earth oxides in the mullite powder is shown according to the mass ratio of the ytterbium silicate (Yb2SiO5) powder. One graph.

Hereinafter, referring to FIGS. 1, 2A, and 2B, a coating method of an environmentally-resistant coating material 100 and an environmentally-resistant coating material 100 to which rare earth oxide powder is added to mullite will be described in detail.

Environment-resistant coating material 100 according to the embodiment may include at least 12wt% rare earth oxide powder.

Rare Earth Elements is a total of 17 elements including 15 lanthanum (lanthanum) -based elements from element symbols 57 to 71, scandium (Sc) at 21, and yttrium (Y) at 39. It is usually silver white or gray metal. Rare earth-based elements have a high affinity for oxygen, and thus can be used as a getter for gases such as pyroalloys, light bulbs and vacuum tubes. In addition, rare earths are chemically very stable, well tolerate dry air, conduct heat well, and have relatively good chemical, electrical, magnetic, and luminescent properties.

In some embodiments, the rare earth oxide included in the environmentally-resistant coating material 100 may be yttria (Y 2 O 3). Yttria (Y2O3) can be obtained by heating yttrium hydroxide, nitrate, sulfate, carbonate, oxalate and the like in the air.

In some embodiments, the rare earth oxide included in the environmentally-resistant coating material 100 may be yttrium silicate (Y 2 SiO 5).

The coating method of the environmentally-resistant coating material according to the present embodiment may include mixing yttria (Y 2 O 3) and silicon oxide (SiO 2) to form a yttrium silicate (Y 2 SiO 5) powder. That is, yttria (Y 2 O 3) powder and silicon oxide (SiO 2) powder may be used as starting materials for forming yttrium silicate (Y 2 SiO 5) powder. Hereinafter, a method of forming a yttrium silicate (Y 2 SiO 5) powder will be described in detail.

First, the yttria (Y 2 O 3) powder and the silicon oxide (SiO 2) powder may be heated in an electronic furnace at 600 ° C. for about 1 hour.

Thereafter, the yttria (Y 2 O 3) powder and the silicon oxide (SiO 2) powder were included in the container in a mass ratio corresponding to a molar ratio of 1: 1, and alcohol and zirconia (ZrO 2) balls were also included together in the ball mill machine for about 24 hours. Ball milling during the process.

Next, the yttria (Y 2 O 3) powder and the silicon oxide (SiO 2) powder may be dried at room temperature for about 48 hours and in an oven maintained at 80 ° C. for about 4 hours.

Finally, the ball milled yttria (Y 2 O 3) * silicon oxide (SiO 2) mixed powder may be heated at about 1400 ° C. temperature conditions for about 20 hours and sintered with yttrium silicate (Y 2 SiO 5). As a result, sintered yttrium silicate (Y 2 SiO 5) powder can be formed.

In the coating method of the environmentally-resistant coating material according to the present embodiment, after forming yttrium silicate (Y 2 SiO 5) powder, 12 wt% or more of the yttrium silicate (Y 2 SiO 5) powder may be added to the mullite powder.

In an alternative embodiment, the mullite powder may be a commercial powder (DURAMUL 325F, Washington Mills, NY, USA).

In the environmentally-resistant coating material 100 according to the present embodiment, sintered yttrium silicate (Y 2 SiO 5) powder may be added to at least 12 wt% of the mullite powder.

FIG. 2A illustrates a change in density (g / cm 3) of the environmental coating material 100 according to the mass ratio (wt%) of the yttrium silicate (Y 2 SiO 5) powder included in the mullite powder.

As shown in FIG. 2A, as the mass ratio (wt%) of the yttrium silicate (Y 2 SiO 5) powder included in the mullite increases, the density (g / cm 3) of the environmentally-resistant coating material 100 may increase.

According to FIG. 2A, as the above-mentioned yttrium silicate (Y 2 SiO 5) is added, the density of mullite is improved, thereby reducing the area of the pores through which water vapor or plasma can penetrate and ultimately the environmentally-resistant coating material 100 ) And the environmentally-resistant coating material 100 is advantageous in that the durability and lifespan of the base material 10 coated with the coating material are efficiently improved.

In addition, mullite can withstand the high temperature of 1800 ℃ or higher has the advantage of high temperature strength, and the density is improved by the addition of yttrium silicate (Y2SiO5), so it maintains a long time at a high temperature of 1100 ~ 1200 ℃, or thermal shock cycle up to room temperature There is an advantageous effect that the environmental coating material 100 can exhibit excellent durability without being peeled from the base material 10 even when applied.

The environmentally-resistant coating material 100 according to the present embodiment has a maximum value of the density (g / cm3) of the environmentally-resistant coating material 100 when the mass ratio of yttrium silicate (Y2SiO5) is approximately 12 wt%, as shown in the graph shown in FIG. 2A. Can have

That is, when the mass ratio of yttrium silicate (Y2SiO5) added to the mullite exceeds 12wt%, the density (g / cm3) value of the environmentally-resistant coating material 100 is saturated so that the mass ratio of yttrium silicate (Y2SiO5) is 12wt% It can have the same value.

Therefore, the environmentally resistant coating material 100 according to the present embodiment may be formed by adding 12 wt% of yttrium silicate (Y 2 SiO 5) to the mullite powder.

In an alternative embodiment, the environmentally-resistant coating material 100 may be formed by adding at least 12 wt% of yttrium silicate (Y 2 SiO 5) to the mullite powder.

The yttrium silicate (Y2SiO5) powder is added to the mullite powder, and the mixed yttrium silicate (Y2SiO5) powder and the mullite powder are sintered, and the environmentally-resistant coating material 100 may be coated on one surface of the base material.

The step of mixing and sintering yttrium silicate (Y 2 SiO 5) powder and the mullite powder may be performed by a ball milling process in the same manner as a method of forming yttrium silicate (Y 2 SiO 5) powder.

That is, the yttrium silicate (Y 2 SiO 5) powder and the mullite powder may be mixed in the same manner as the above method for mixing the yttria (Y 2 O 3) and the silicon oxide (SiO 2).

The environmentally-resistant coating material 100 may be formed through drying, grinding, and sieving yttrium silicate (Y 2 SiO 5) powder and mullite powder.

After performing the above steps, the yttrium silicate (Y2SiO5) and the mullite mixed powder were compressed at a pressure of 40 MPa, sintered at 1600 ° C for 10 hours at a heating rate of 5 ° C per minute, and formed on the surface of the base material 10. Environmental coating material 100 may be coated.

Of course, the time for heating the yttrium silicate (Y2SiO5) and the mullite mixed powder and the temperature conditions for heating are not limited to the above embodiment, and as another optional embodiment, after mixing the yttrium silicate (Y2SiO5) powder and the mullite powder 3 By sintering at a temperature of 1600 ° C. for a time, an environmental coating material 100 may be formed.

As another alternative embodiment, the yttrium silicate (Y 2 SiO 5) powder and the mullite powder may be mixed and then sintered at 1700 ° C. for 3 hours to form the environmentally-resistant coating material 100.

Figure 2a is the addition of yttrium silicate (Y2SiO5) powder to the mullite sintered yttrium silicate (Y2SiO5) powder and mullite powder under three conditions: 1600 ℃ for 10 hours, 1600 ℃ for 3 hours, 1700 ℃ for 3 hours In the case of forming the environmentally-resistant coating material 100, the density (g / cm3) of the environmentally-resistant coating material 100 is shown, respectively.

According to the graph shown in FIG. 2a, the density (g / cm3) of the environmentally-resistant coating material 100 formed when the yttrium silicate (Y2SiO5) powder and the mullite powder are mixed and sintered at 1700 ° C. for 3 hours is 1600 ° C. It can be seen that when the sintering under the conditions is greater than the density (g / cm 3) of the environmentally-resistant coating material 100 is formed.

In addition, when yttrium silicate (Y2SiO5) powder is added 12 wt% or more, the density of the environmentally-resistant coating material 100 is higher than that of heating and sintering for 3 hours when heating and sintering at 1600 ° C. for 10 hours (g / It can be seen that cm3) is large.

In an alternative embodiment, the rare earth oxide may be ytterbium oxide (Yb 2 O 3) or ytterbium silicate (Yb 2 SiO 5).

In some embodiments, the rare earth oxide included in the environmentally-resistant coating material 100 may be ytterbium silicate (Yb 2 SiO 5).

The coating method of the environmentally-resistant coating material according to the present embodiment may include mixing ytterbium (Yb 2 O 3) and silicon oxide (SiO 2) to form ytterbium silicate (Yb 2 SiO 5) powder. .

The forming of the ytterbium silicate (Yb 2 SiO 5) powder may be different from the forming of the above yttrium silicate (Y 2 SiO 5) powder and the initial raw material, and the remaining methods and conditions may be the same.

That is, the initial raw material of the yttrium silicate (Y2SiO5) powder is yttria (Y2O3), and the initial raw material of the ytter [b] silicate silicate (Yb2SiO5) powder is only ytter [b] Obium (Yb2O3). The method is the same, and thus the method of forming the ytterbium silicate (Yb 2 SiO 5) powder is not described separately to avoid redundant description.

The formed ytterbium silicate (Yb 2 SiO 5) powder may be added to the mullite powder to form the environmental coating material 100.

As an optional embodiment, as an alternative embodiment, the mullite powder may be a commercial powder (DURAMUL 325F, Washington Mills, NY, USA).

In an alternative embodiment, the mass ratio of ytterbium silicate (Yb 2 SiO 5) added to the mullite powder may be 12 wt%.

As another example, the mass ratio of ytterbium silicate (Yb 2 SiO 5) added to the mullite powder may be 12 wt% or more.

FIG. 2B illustrates a change in density (g / cm 3) of the environmental coating material 100 according to the mass ratio (wt%) of the ytterbium silicate (Yb 2 SiO 5) powder included in the mullite powder.

As shown in FIG. 2B, as the mass ratio (wt%) of the ytterbium silicate (Yb 2 SiO 5) powder included in the mullite increases, the density (g / cm 3) of the environmental coating material 100 may increase.

According to FIG. 2B, as the above-described addition of ytterbium silicate (Yb 2 SiO 5), the density of mullite is improved, thereby reducing the area of the pores through which water vapor or plasma can penetrate and ultimately. There is an advantageous effect that the durability and lifespan of the environmentally-resistant coating material 100 and the base material 10 to which the environmental-resistant coating material 100 is coated are efficiently improved.

In addition, mullite can withstand high temperatures of 1800 ℃ or higher has the advantage of high temperature strength, and since the density of the ytterbium silicate (Yb2SiO5) is added, it is maintained for a long time at a high temperature of 1100 ~ 1200 ℃, or room temperature Even if the thermal shock cycle is applied, the environmentally-resistant coating material 100 is advantageous in that it can exhibit excellent durability without being peeled from the base material 10.

The environmentally resistant coating material 100 according to the present embodiment has a mass ratio of ytterbium silicate (Yb2SiO5) added to the mullite as shown in the graph shown in FIG. Density (g / cm3) values can be nearly saturated.

However, the present invention is not limited thereto, and FIG. 2B illustrates a case where the mass ratio of the ether [ether] bium silicate (Yb 2 SiO 5) is 12 wt% when the mass ratio of the ether [ether] bium silicate (Yb 2 SiO 5) added to the mullite exceeds 12 wt%. It can be seen that the density (g / cm 3) value of the environmentally-resistant coating material 100 increases little by little.

Therefore, the environmentally-resistant coating material 100 according to the present embodiment may be formed by adding at least 12 wt% of ytterbium silicate (Yb 2 SiO 5) to the mullite powder.

3A to 3C show SEM images of 100 wt% of mullite, 12 wt% of mullite + yttrium silicate (Y 2 SiO 5), and 12 wt% of sintered mullite + ytterbium [ytterbium silicate (Yb 2 SiO 5).

As can be seen from the photographs shown in FIGS. 3A to 3C, when yttrium silicate (Y2SiO5) or ytterbium silicate (Yb2SiO5) is added to the mullite to form a sintered body, the sintered body formed of only mullite Since the density (g / cm 3) is higher than the case there is an advantageous effect that can withstand the high temperature well and also prevent the penetration of gas and plasma.

As a result, the structure coated with the environmentally-resistant coating material according to the present embodiment is an environmental environment in which sintering is formed by adding at least 12wt% of rare earth oxide powder to the mullite powder using components such as turbine components, semiconductor components, and nuclear components as a base material. It is formed by coating a coating material, which withstands high temperature and high pressure environments, has a high density, and does not penetrate gas or plasma, and thus has an advantageous effect of efficiently improving durability and lifespan.

While the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the specific embodiments described above, it is usually in the art without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

10: base material
100: environmentally-resistant coating material
1000: structure coated with an environmental coating material

Claims (18)

delete delete delete delete delete delete delete delete delete delete delete delete delete Mixing yttria (Y 2 O 3) and silicon oxide (SiO 2) to form a yttrium silicate (Y 2 SiO 5) powder;
Adding at least 12 wt% of the yttrium silicate (Y 2 SiO 5) powder to mullite powder; And
12 wt% or more of the yttrium silicate (Y 2 SiO 5) powder and the mullite powder, followed by sintering the mixed yttrium silicate (Y 2 SiO 5) powder and mullite powder to coat an environmental coating material on one surface of a base material;
Method of coating an environmentally-resistant coating comprising a. The method of claim 14,
And sintering the mixed yttrium silicate (Y 2 SiO 5) powder and the mullite powder comprises heating at least 1600 ° C. for at least 10 hours. The method of claim 14,
And sintering the mixed yttrium silicate (Y 2 SiO 5) powder and the mullite powder comprises heating at least 1 hour at a temperature of 1700 ° C. or more. The method of claim 14,
The mixing of the yttria (Y 2 O 3) and the silicon oxide (SiO 2) and the mixing of the mullite powder and the yttrium silicate (Y 2 SiO 5) powder may be performed by coating an environmental coating material which is performed by a ball milling process. How to. Mixing ytterbium (Yb2O3) and silicon oxide (SiO2) to form a ytterbium silicate (Yb2SiO5) powder;
Adding at least 12 wt% of the ytterbium silicate (Yb 2 SiO 5) powder to mullite powder; And
12 wt% or more of the above ytterbium silicate (Yb2SiO5) powder and the mullite powder are mixed, and then the mixed ytterbium silicate (Yb2SiO5) and mullite powder are sintered to provide an environmental coating material on one surface of the base material. Coating;
Method of coating an environmentally-resistant coating comprising a.

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