Multi-component sealing coating powder material and preparation method thereof

Abstract

A multi-component sealing coating powder material and a preparation method thereof are provided, which relates to the technical field of thermal spraying materials. The multi-component sealing coating powder material includes the following raw materials in parts by weight: 10-20 parts of titanium aluminide powder, 2-8 parts of muscovite powder, 5 -15 parts of boron nitride powder, 65-75 parts of Al-based mixed powder, and 0.1-5 parts of a binder. The Al-based mixed powder is at least one of aluminum powder, alumina spheres, and alumina grinding powder. The multi-component sealing coating powder material exhibits good adaptability to the plasma spraying process and yields coatings with high quality and stability. It effectively solves problems of traditional aluminum-based suspension coatings in poor coating structural uniformity, low bond strength, and poor abradability caused by significant compositional fluctuations and insufficient processing stability.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese Patent Application No. 202510368398.2, filed on Mar. 27, 2025, which is herein incorporated by reference in its entirety.TECHNICAL FIELD

[0002] The disclosure relates to the technical field of thermal spraying materials, and more particularly to a multi-component sealing coating powder material and a preparation method thereof.BACKGROUND

[0003] With rapid development of aviation industry, increasingly higher demands are placed on thrust, efficiency, and fuel consumption of aero-engines. The abradable sealing coating is a key technology in aero-engines, which can improve overall air tightness of an engine without damaging blades. This is of great significance for improving the overall efficiency of aero-engines, reducing fuel consumption, and extending component service life.

[0004] Abradable sealing coating materials have relatively complex components, including metals, alloys, ceramics, and inorganic non-metals. The coating materials can be in various forms such as powders, rods, wires, or solid-liquid mixed coatings, and different materials and forms correspond to different spraying processes and equipment. The method of preparing sealing coatings by using inorganic suspension coatings formulated with binders and metal-ceramic composite powders through coating and curing has been used in key components for many years compared to conventional thermal spraying due to advantages such as no thermal impact on the substrate and low coating processing and maintenance costs. However, the inorganic suspension coatings still suffer from the following problems. 1. The suspension coatings contain complex components of binders and metal-ceramic composite powders, resulting in insufficient consistency of the formulated suspension composition, large viscosity fluctuations, poor consistency of the liquid amount on the workpiece surface during a single spraying operation, and instability of the spraying process. During post-treatment of the sprayed, sintered, and cured coating, local peeling will occur, which needs secondary repair, thus affecting the quality of the abradable sealing coating and the processing schedule. 2. The suspension coatings are applied by using traditional manual spray guns. During the spraying process, discontinuous feeding often occurs, and the coating liquid easily adheres unevenly on the part surface, leading to fluctuations in the density of the cured coating and insufficient uniformity of the coating structure. This directly affects coating properties such as hardness, bond strength, and abradability.SUMMARY

[0005] In order to overcome problems of aluminum-based inorganic suspension coatings in the related art, such as significant compositional fluctuations and instability of manual spraying processes, and the resulting defects of poor coating uniformity, low bond strength, and susceptibility to spallation, the disclosure provides a multi-component sealing coating powder material and a preparation method thereof.

[0006] In order to achieve the above purpose, the disclosure provides the following technical solutions.

[0007] A first technical solution of the disclosure, a multi-component sealing coating powder material includes the following raw materials in parts by weight:

[0008] 10-20 parts of titanium aluminide powder, 2-8 parts of muscovite powder, 5-15 parts of boron nitride powder, 65-75 parts of aluminum (Al)-based mixed powder, and 0.1-5 parts of a binder; where the Al-based mixed powder is at least one of aluminum powder, alumina spheres, and alumina grinding powder.

[0009] A second technical solution of the disclosure, a preparation method of the above multi-component sealing coating powder material includes:

[0010] mixing titanium aluminide powder, muscovite powder, boron nitride powder and Al-based mixed powder to obtain a first mixture, and ball milling the first mixture to obtain a mixed material; and

[0011] mixing the mixed material with a binder evenly to obtain a second mixture, granulating the second mixture, followed by drying and sieving, to obtain the multi-component sealing coating powder material.

[0012] A third technical solution of the disclosure, an application method of the multi-component sealing coating powder material in plasma spraying for preparing a sealing coating is provided, including:

[0013] atmospheric plasma spraying the multi-component sealing coating powder material onto a surface of a substrate with a spray thickness of 1.5 millimeters (mm) to 2.0 mm, to prepare the sealing coating; where spray parameters include: argon flow rate of 33 liters per minute (L / min) to 40 L / min, hydrogen flow rate of 5 L / min to 8 L / min, current of 520 amperes (A) to 550 A, power of 32 kilowatts (kW) to 38 kW, and spray distance of 100 mm to 120 mm.

[0014] The disclosure has the following technical effects.

[0015] The disclosure utilizes aluminum-based metals such as the aluminum powder, the alumina grinding powder, and the alumina spheres, oxides (alumina), or intermetallic compounds (the titanium aluminide powder) as skeleton components, which has characteristics such as high specific strength, high specific modulus of elasticity, good oxidation resistance, creep resistance, excellent high-temperature strength, high stiffness, and low density, so that oxidation resistance and high-temperature strength of the coating can be improved, and the coating density can be effectively reduced. Using hexagonal boron nitride as an abradable lubricant enhances lubricity and abradability of the coating. Muscovite is hard, and possesses high mechanical strength, which can withstand high temperatures and rapid temperature changes, and exhibits good physical and chemical properties such as resistance to acids and alkalis. The muscovite can improve resistance to acids and alkalis and electrical insulation of the coating, thereby improving freeze-thaw resistance, corrosion resistance, toughness, and compactness of the coating, while reducing gas permeability of the coating, and preventing spotting and cracking. By employing combined composite processes such as “ball milling and mixing, agglomeration and stirring for granulation”, the prepared multi-component aluminum-based sealing composite powder exhibits good adaptability to the plasma spraying process. The resulting coatings are of high quality and stability, which successfully solves problems of the traditional aluminum-based suspension coatings in poor coating structural uniformity, low coating hardness, and low bond strength caused by significant compositional fluctuations and insufficient processing stability.

[0016] After plasma spraying with the multi-component sealing coating powder material of the disclosure, the obtained sealing coating exhibits a uniform structure, and significantly improved bond strength and abradability. An incursion depth ratio (IDR) value of the coating is in a range of 4.5% to 9.8%, a bond strength of the coating is in a range of 9.6 megapascals (MPa) to 12.3 MPa, and the coating hardness is in a range of 57.8HR15Y (i.e., the material exhibits a Rockwell hardness of 57.8, measured by using a ¼-inch diameter steel ball indenter under a total test load of 15 kilogram-force (kgf)) to 62.2HR15Y.

[0017] The powder-form coating material prepared by the disclosure offers advantages such as effective melting and deposition, precisely controllable powder feed rate, variety and strong applicability, as well as convenient and fast transportation and storage. This powder material demonstrates good adaptability to spraying processes, and the prepared coatings are of high quality and stability.BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to provide a clearer explanation of technical solutions in embodiments of the disclosure or related art, drawings required in the embodiments will be briefly introduced below. Apparently, the drawings in the following descriptions are merely some of the embodiments. For those skilled in the art, other drawings obtained according to these drawings without creative work.

[0019] FIG. 1 illustrates a morphology photograph of a multi-component sealing coating powder material prepared in an embodiment 1.

[0020] FIG. 2 illustrates a microscopic morphology photograph of a sealing coating obtained by plasma spraying the multi-component sealing coating powder material prepared in the embodiment 1.

[0021] FIG. 3 illustrates a morphology photograph of the sealing coating obtained by plasma spraying the multi-component sealing coating powder material prepared in the embodiment 1 after a tip-rub cutting-in test.

[0022] FIG. 4 illustrates a morphology photograph of a blade after the tip-rub cutting-in test against the sealing coating obtained by plasma spraying the multi-component sealing coating powder material prepared in the embodiment 1.

[0023] FIG. 5 illustrates a microscopic morphology photograph of a sealing coating obtained by plasma spraying a multi-component sealing coating powder material prepared in a comparative embodiment 1.

[0024] FIG. 6 illustrates a morphology photograph of the sealing coating obtained by plasma spraying the multi-component sealing coating powder material prepared in the comparative embodiment 1 after the tip-rub cutting-in test.

[0025] FIG. 7 illustrates a morphology photograph of a blade after the tip-rub cutting-in test against the sealing coating obtained by plasma spraying the multi-component sealing coating powder material prepared in the comparative embodiment 1.

[0026] FIG. 8 illustrates a morphology photograph of a sealing coating obtained by plasma spraying a multi-component sealing coating powder material prepared in a comparative embodiment 3 after the tip-rub cutting-in test.

[0027] FIG. 9 illustrates a morphology photograph of a blade after the tip-rub cutting-in test against the sealing coating obtained by plasma spraying the multi-component sealing coating powder material prepared in the comparative embodiment 3.DETAILED DESCRIPTION OF EMBODIMENTS

[0028] Various exemplary embodiments of the disclosure are described in detail below. This detailed description should not be construed as limiting the disclosure, but rather as providing a more detailed description of certain aspects, characteristics, and embodiments of the disclosure.

[0029] It should be understood that terms used herein are for a purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Furthermore, for numerical ranges in the disclosure, it should be understood that each intermediate value between upper and lower limits of the range is specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and every other stated value or intermediate value within the stated range, is included in the disclosure. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. Although only some methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the disclosure. All publications mentioned herein are incorporated by reference to disclose and describe the methods and / or materials related to the publications. In case of conflict with any incorporated publication, the content of the present specification shall prevail.

[0031] Various modifications and changes can be made to the specific embodiments described in the specification of the disclosure without departing from a scope or a spirit of the disclosure, as will be apparent to those skilled in the art. Other embodiments obtained from the description of the disclosure will be obvious to those skilled in the art. The specification and examples of the disclosure are to be regarded as exemplary only.

[0032] Regarding terms used herein, such as “comprise”, “include”, “have”, and “contain”, they are open-ended terms, meaning including but not limited to.

[0033] With the development of thermal spray technology, sealing coating materials are predominantly in powder form. Powder-form coating materials offer advantages such as effective melting and deposition, precise control of powder feed rate, wide variety and strong applicability, as well as convenient and fast transportation and storage. Plasma spraying is currently a more advanced thermal spray technology. It operates on a principle of using a high-temperature arc generated in an ionized gas to heat and accelerate the coating material. A temperature at a center of the plasma jet can be as high as 30,000 Celsius degrees (° C.), with particle velocities reaching up to 400 meters per second (m / s). This significantly enhances coating density and bond strength, and generates sufficient energy to melt almost all powdered coating materials. It can spray various powder materials including metal powders, ceramic powders, cermet powders, and composite powders, and can prepare various functional coatings such as sealing coatings, ablation-resistant coatings, thermal barrier coatings, and wear-resistant coatings. Furthermore, the equipment features a high degree of automation, enables closed-loop control, offers stable process parameters, and ensures consistent coating quality. Powder materials exhibit good adaptability to the plasma spraying process, resulting in high coating quality and stability. In order to prepare high-quality coatings, the disclosure provides a multi-component sealing coating powder material suitable for plasma spraying.

[0034] A first aspect of the disclosure provides a multi-component sealing coating powder material, including the following raw materials in parts by weight: 10-20 parts of titanium aluminide powder, 2-8 parts of muscovite powder, 5-15 parts of boron nitride powder, 65-75 parts of Al-based mixed powder, and 0.1-5 parts of a binder; where the Al-based mixed powder is at least one of aluminum powder, alumina spheres, and alumina grinding powder.

[0035] In an embodiment of the disclosure, the multi-component sealing coating powder material, includes the following raw materials in parts by weight: 10-15 parts of the titanium aluminide powder, 3-6 parts of the muscovite powder, 8-12 parts of the boron nitride powder, 68-73 parts of the Al-based mixed powder, and 0.1-3 parts of the binder; where the Al-based mixed powder is at least one of the aluminum powder, the alumina spheres, and the alumina grinding powder.

[0036] In an embodiment of the disclosure, the multi-component sealing coating powder material, includes the following raw materials in parts by weight: 12-15 parts of the titanium aluminide powder, 4-6 parts of the muscovite powder, 8-11 parts of the boron nitride powder, 70-73 parts of the Al-based mixed powder, and 0.1-2 parts of the binder; where the Al-based mixed powder is at least one of the aluminum powder, the alumina spheres, and the alumina grinding powder.

[0037] In an embodiment of the disclosure, a mass ratio of the aluminum powder, the alumina spheres, and the alumina grinding powder in the Al-based mixed powder is 6.5-7:1.4-1.6:1 (in an embodiment, 6.5:1.5:1).

[0038] In the disclosure, the multi-component sealing coating powder material includes the following compositions by mass percentage: 2% to 9% of titanium (Ti), 5% to 15% of boron nitride, 1% to 4% of silicon oxide (SiO2), 0.1% to 5.0% of the binder, with the balance being Al and other unavoidable impurities. In the disclosure, the Ti element in the multi-component sealing coating powder material is provided by the titanium aluminide powder, the SiO2 is provided by the muscovite powder, and the Al-based mixed powder provides the remaining required aluminum element. Impurities in the multi-component sealing coating powder material are introduced from unavoidable impurities in the raw materials, for example, the muscovite powder may contain calcium oxide and magnesium oxide, in addition to SiO2.

[0039] In an embodiment of the disclosure, the binder is prepared by dissolving chromium trioxide (CrO3) in an aluminum dihydrogen phosphate solution. A mass concentration of the aluminum dihydrogen phosphate solution is in a range of 50% to 80%. A concentration of CrO3 in the binder i s in a range of 65 grams per liter (g / L) to 75 g / L.

[0040] In an embodiment of the disclosure, a particle size of the titanium aluminide powder is in a range of 10 microns (μm) to 180 μm. A particle size of the muscovite powder is in a range of 10 μm to 180 μm. The boron nitride powder is hexagonal boron nitride powder, and a particle size of the hexagonal boron nitride powder is in a range of 5 μm to 20 μm. A particle size of the aluminum powder is in a range of 10 μm to 180 μm. A particle size of the alumina grinding powder is in a range of 35 μm to 75 μm. A particle size of each of the alumina spheres is in a range of 10 μm to 180 μm.

[0041] A second aspect of the disclosure provides a preparation method of the multi-component sealing coating powder material, including the following steps.

[0042] The titanium aluminide powder, the muscovite powder, the boron nitride powder and the Al-based mixed powder are mixed to obtain a first mixture, and the first mixture is ball milled to obtain a mixed material.

[0043] The mixed material is mixed with the binder evenly to obtain a second mixture, and the second mixture is granulated, dried and sieved to obtain the multi-component sealing coating powder material.

[0044] In an embodiment of the disclosure, a period of the ball milling is in a range of 10 hours (h) to 14 h, and a speed of the ball milling is in a range of 40 revolutions per minute (rpm) to 60 rpm.

[0045] In an embodiment of the disclosure, a temperature of the drying is in a range of 110° C. to 130° C., and a period of the drying is in a range of 4 h to 6 h.

[0046] In an embodiment of the disclosure, the second mixture is granulated through the following steps. The second mixture is placed in a granulator. The binder is added into the granulator to perform agglomeration stirring granulation at a stirring speed of 40 rpm to 80 rpm for 1 h to 3 h, to obtain granular multi-component sealing coating powder material.

[0047] In an embodiment of the disclosure, the sieving is performed by using a 60-mesh screen and a 325-mesh screen individually. After sieving, a multi-component sealing coating powder material with a particle size of 45 μm to 300 μm is obtained.

[0048] A third aspect of the disclosure provides an application method of the above multi-component sealing coating powder material in plasma spraying for preparing a sealing coating.

[0049] The technical solutions of the disclosure, unless otherwise specified, are conventional in the art, and the reagents or raw materials used, unless otherwise specified, are all purchased from commercial sources or are publicly known.

[0050] In order to facilitate a better understanding of the disclosure, the content of the disclosure is further clarified below in conjunction with embodiments, but the content of the disclosure is not limited merely to the following embodiments.

[0051] In the embodiments, the particle sizes of the various materials are as follows. A particle size of the titanium aluminide powder is in a range of 10 μm to 180 μm. A particle size of the muscovite powder is in a range of 10 μm to 180 μm. The boron nitride powder is hexagonal boron nitride powder, and a particle size of the hexagonal boron nitride powder is in a range of 5 μm to 20 μm. A particle size of the aluminum powder is in a range of 10 μm to 180 μm. A particle size of the alumina grinding powder is in a range of 35 μm to 75 μm. A particle size of each of the alumina spheres is in a range of 10 μm to 180 μm.EMBODIMENT 1

[0052] A multi-component sealing coating powder material is prepared by the following steps 1-7.

[0053] In step 1, 2.64 kilograms (kg) of aluminum powder, 0.38 kg of alumina grinding powder, 0.60 kg of alumina spheres, 0.75 kg of titanium aluminide powder, 0.29 kg of muscovite powder and 0.53 kg of hexagonal boron nitride powder are placed in a ball milling barrel.

[0054] In step 2, 3 kg of zirconia grinding balls are added to the ball milling barrel to obtain powder. The ball milling is performed at a speed of 50 rpm for 12 h.

[0055] In step 3, the powder obtained from step 2 is sieved by using a 30-mesh sieve compliant with standard GB / T 5330-2003 (industrial woven metal wire cloth (square opening series)) to obtain a mixed material, and the mixed material is collected.

[0056] In step 4, 1200 milliliters (mL) of an aluminum dihydrogen phosphate solution with a mass concentration of 70% is measured, and 84 g of CrO3 powder is added into the aluminum dihydrogen phosphate solution to obtain a first mixture. The first mixture is stirred uniformly until complete dissolution to obtain an aluminum-chromium phosphate binder.

[0057] In step 5, the mixed material obtained in step 3 is added into a granulator. Then, the binder (i.e., aluminum-chromium phosphate binder) obtained from step 4 is added into the granulator to obtain a second mixture. The granulator is activated to stir the second mixture at a speed of 70 rpm for 2.5 h until the powder forms granules.

[0058] In step 6, after the stirring stops, the granular material obtained from step 5 is placed in an oven and dried at 120°C for 4 h.

[0059] In step 7, the granular material obtained from step 6 is sieved by using 60-mesh and 325-mesh screens compliant with standard GB / T 5330-2003. The powder passing through the 60-mesh sieve but retained on the 325-mesh sieve is collected as the final multi-component sealing coating powder material. A morphology photograph of this multi-component sealing coating powder material is shown in FIG. 1.

[0060] The multi-component sealing coating powder material prepared in the embodiment is used for plasma spraying. The plasma spraying parameters are: 25-45 normal liters per minute (NLPM) of main gas flow, 5-10 NLPM of auxiliary gas flow, 3-6 NLPM of carrier gas flow, 500-600 A of current, 30-40 kilowatts (kW) of spray power, 20-50 grams per minute (g / min) of powder feed rate, 80-120 millimeters (mm) of spray distance, and 3-8 millimeters per second (mm / s) of traverse speed. During the plasma spraying process, the powder feeding is smooth and uninterrupted. The prepared sealing coating exhibits a uniform structure, significantly improved bond strength, and abradability. FIG. 2 illustrates a microscopic morphology photograph of the coating after plasma spraying. Under simulated service conditions of high temperature (300° C.) and high speed (300 m / s, 50 microns per second (μm / s) incursion rate) during a tip-rub cutting-in test against a titanium alloy blade, the coating wear is smooth and flat (FIG. 3), and the blade tip shows no wear (FIG. 4), which indicates significantly improved abradability. The IDR value is 6.3%. The bond strength of the plasma-sprayed coating is 10.9 MPa; and the coating hardness is 59.8HR15Y.COMPARATIVE EMBODIMENT 1

[0061] A multi-component sealing coating powder material is prepared by the following steps 1-4.

[0062] Step 1 is the same as the step 1 in the embodiment 1.

[0063] Step 2 is the same as the step 2 in the embodiment 1.

[0064] Step 3 is the same as the step 3 in the embodiment 1.

[0065] In step 4, 3800 mL of an aluminum dihydrogen phosphate solution with a mass concentration of 30% is measured, and 84 g of CrO3 powder is added into the aluminum dihydrogen phosphate solution to obtain a mixture. The mixture is stirred uniformly until complete dissolution to obtain a suspension coating (i.e., multi-component sealing coating material).

[0066] A sealing coating is prepared by the suspension coating of the comparative embodiment by the coating and curing method, and the sealing coating exhibits a non-uniform structure (FIG. 5). Under the simulated service conditions of high-temperature (300° C.) and high-speed (300 m / s, 50 μm / s incursion rate) during the tip-rub cutting-in test against a titanium alloy blade, the coating is barely abraded (FIG. 6), whereas the blade suffers severe wear and deformation (FIG. 7). The IDR value is 76%, which indicates poor abradability. The coating prepared from the suspension coating shows a bond strength of 4.5 MPa and a hardness of 52.2HR15Y.COMPARATIVE EMBODIMENT 2

[0067] A multi-component sealing coating powder material is prepared by the following steps 1-7.

[0068] Step 1 is the same as the step 1 in the embodiment 1.

[0069] Step 2 is the same as the step 2 in the embodiment 1.

[0070] Step 3 is the same as the step 3 in the embodiment 1.

[0071] In step 4, 1000 mL of an aluminum dihydrogen phosphate solution with a mass concentration of 70% is measured, and 170 g of CrO3 powder is added into the aluminum dihydrogen phosphate solution to obtain a mixture. The mixture is stirred uniformly until complete dissolution to obtain an aluminum chromium phosphate binder.

[0072] Step 5 is the same as the step 5 in the embodiment 1.

[0073] Step 6 is the same as the step 6 in the embodiment 1.

[0074] Step 7 is the same as the step 7 in the embodiment 1.

[0075] Compared with the embodiment 1, the comparative embodiment uses an excessive amount of binder, so that the prepared multi-component sealing coating powder material has irregular particles and a coarser particle size distribution, thereby demonstrating poor adaptability to the plasma spraying process.COMPARATIVE EMBODIMENT 3

[0076] The only difference from the embodiment 1 is that 2.64 kg of aluminum powder is replaced with 3.2 kg of aluminum powder, and all other steps and parameters are the same as the embodiment 1.

[0077] The multi-component sealing coating powder material prepared in the comparative embodiment is used for plasma spraying. The plasma spraying parameters are the same as the embodiment 1. The resulting coating has a hardness of 39.5HR15Y and a bond strength of 5.7 MPa. Under simulated service conditions of high-temperature (300° C.) and high-speed (300 m / s, 50 μm / s incursion rate) during the tip-rub cutting-in test against the titanium alloy blade, the coating surface exhibits grooves (FIG. 8), and the blade tip shows obvious adhesion marks (FIG. 9). The IDR value is −15.5%, which indicates poor abradability. That is, compared with the embodiment 1, the excessive addition of aluminum led to decreased coating hardness and bond strength, and reduced abradability (negative IDR value and adhesion on the blade tip).

[0078] Comparative embodiment 4

[0079] The only difference from the embodiment 1 is that 0.29 kg of muscovite powder is replaced with 0.52 kg of muscovite powder, and all other steps and parameters are the same as the embodiment 1.

[0080] The multi-component sealing coating powder material prepared in the comparative embodiment is used for plasma spraying. The plasma spraying parameters are the same as the embodiment 1. The resulting coating has a hardness of 76.4HR15Y. Under simulated service conditions of high-temperature (300° C.) and high-speed (300 m / s, 50 μm / s incursion rate) during the tip-rub cutting-in test against the titanium alloy blade, the coating surface exhibits grooves, and the blade tip suffers relatively severe wear. The IDR value is 18.9%, which indicates poor abradability. That is, compared with the embodiment 1, the excessive addition of muscovite resulted in increased coating hardness and reduced abradability (increased IDR value and aggravated blade wear).COMPARATIVE EMBODIMENT 5

[0081] The only difference from the embodiment 1 is that the addition of hexagonal boron nitride is omitted, and all other steps and parameters are the same as the embodiment 1.

[0082] The multi-component sealing coating powder material prepared in the comparative embodiment is used for plasma spraying. The plasma spraying parameters are the same as the embodiment 1. The resulting coating has a hardness of 61.3HR15Y. Under simulated service conditions of high-temperature (300° C.) and high-speed (300 m / s, 50 μm / s incursion rate) during the tip-rub cutting-in test against the titanium alloy blade, the coating surface exhibits grooves, and adhesion on the blade tip is more pronounced. The IDR value is −23.6%, which indicates poor abradability. That is, compared with the embodiment 1, the absence of hexagonal boron nitride powder in the raw materials leads to a slight increase in coating hardness, reduced abradability, and more obvious adhesion on the blade tip.

[0083] The above is merely some of the embodiments of the disclosure. It should be pointed out that for those skilled in the art, multiple improvements and embellishments can be made without departing from principles of the disclosure, and these improvements and embellishments should also be considered as a scope of protection of the disclosures.

Claims

1. An application of a multi-component sealing coating powder material in plasma spraying for preparing a sealing coating, wherein the multi-component sealing coating powder material comprises the following raw materials in parts by weight:12-15. parts of titanium aluminide powder, 4-6 parts of muscovite powder, 8-11 parts of boron nitride powder, 70-73 parts of aluminum (Al)-based mixed powder, and 0.1-2 parts of a binder;wherein the Al-based mixed powder is aluminum powder, alumina spheres, and alumina grinding powder;wherein a mass ratio of the aluminum powder, the alumina spheres, and the alumina grinding powder in the Al-based mixed powder is 6.5-7:1.4-1.6:1;wherein the binder is prepared by dissolving chromium trioxide (CrO3) in an aluminum dihydrogen phosphate solution; a mass concentration of the aluminum dihydrogen phosphate solution is in a range of 50% to 80%; and a concentration of CrO3 in the binder is in a range of 65 grams per liter (g / L) to 75 g / L;wherein a particle size of the titanium aluminide powder is in a range of 10 microns (μm) to 180 μm; a particle size of the muscovite powder is in a range of 10 μm to 180 μm; the boron nitride powder is hexagonal boron nitride powder; a particle size of the hexagonal boron nitride powder is in a range of 5 μm to 20 μm; a particle size of the aluminum powder is in a range of 10 μm to 180 μm; a particle size of the alumina grinding powder is in a range of 35 μm to 75 μm; and a particle size of each of the alumina spheres is in a range of 10 μm to 180 μm.

2. The application of the multi-component sealing coating powder material in plasma spraying for preparing the sealing coating as claimed in claim 1, wherein a preparation method of the multi-component sealing coating powder material comprises:mixing the titanium aluminide powder, the muscovite powder, the boron nitride powder and the Al-based mixed powder to obtain a first mixture, and ball milling the first mixture to obtain a mixed material; andmixing the mixed material with the binder evenly to obtain a second mixture, granulating the second mixture, followed by drying and sieving, to obtain the multi-component sealing coating powder material.

3. The application of the multi-component sealing coating powder material in plasma spraying for preparing the sealing coating as claimed in claim 2, wherein a period of the ball milling is in a range of 10 hours (h) to 14 h, and a speed of the ball milling is in a range of 40 revolutions per minute (rpm) to 60 rpm.

4. The application of the multi-component sealing coating powder material in plasma spraying for preparing the sealing coating as claimed in claim 2, wherein a temperature of the drying is in a range of 110 Celsius degrees (° C.) to 130° C., and a period of the drying is in a range of 4 h to 6 h.

5. The application of the multi-component sealing coating powder material in plasma spraying for preparing the sealing coating as claimed in claim 2, wherein the sieving is performed by using a 60-mesh screen and a 325-mesh screen individually.

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