A rare earth doped alumina-titania thermal spray material, a coating thereof, and a method of making the same

Abstract

The application discloses a rare earth doped alumina-titanium spraying material, a coating thereof and a preparation method thereof, and belongs to the technical field of rare earth materials. The material is prepared from the following raw materials in parts by weight: lanthanum cerium carbonate 0.01-5 parts, titanium oxide 3-40 parts, hydroxyethyl cellulose 0.1-2 parts, dodecylbenzyl ammonium chloride 0.01-0.5 parts, n-heptane 1-3 parts, deionized water 150-220 parts, alumina 100 parts and peach gum powder 0.05-3 parts. The preparation method comprises the following steps: mixing part of the raw materials, placing the mixed raw materials in a nano sand mill and performing normal-temperature cyclic fine grinding, stirring the obtained mixed slurry in a peach gum powder aqueous solution at normal temperature, performing spray granulation, and performing high-temperature calcination on the obtained precursor powder to obtain the product. Compared with the prior art, the rare earth doped alumina-titanium spraying material prepared by the application has the advantages of low preparation cost, controllable particle size, good fluidity, high hardness of the obtained coating and good wear resistance.

Description

Technical Field

[0001] This invention relates to the field of rare earth materials technology, and more specifically to a rare earth-doped alumina titanium spraying material, its coating and preparation method. Background Technology

[0002] Friction and wear are among the main failure modes of metal equipment and materials under harsh working conditions, leading to increased maintenance or replacement costs during production. Therefore, improving the friction and wear resistance of materials is of great significance. Surface treatment of workpieces using thermal spraying technology can significantly improve the wear resistance of materials and equipment. Oxide and alloy wear-resistant ceramic coatings have advantages such as good wear resistance, high bonding strength between the coating and the substrate, and small coating mass. The introduction of appropriate amounts of rare earth elements into wear-resistant ceramic coatings can refine grains, purify the microstructure, and generate solid solution strengthening and dispersion strengthening, effectively improving the microstructure of the coating, increasing the strength, hardness, wear resistance, high-temperature resistance, and corrosion resistance of the coating material, and enhancing the bonding strength between the coating and the substrate, thereby improving the service life of metal equipment.

[0003] The main methods for applying metallic and non-metallic ceramics to the surface of metallic materials include arc spraying, plasma spraying, hypersonic flame spraying, laser cladding, and electrical spark deposition.

[0004] CN 114875379 A discloses an alumina composite coating, its preparation method and cutting device. The technology used is chemical vapor deposition, which is advantageous for smaller workpieces, but has a higher cost when used for large-area coatings.

[0005] CN 113913728 A discloses a method for improving the adhesion strength of plasma-sprayed AT coatings on the surface of overfeed rollers. The alumina-titanium coating raw material used is a mixture of alumina and titanium oxide with a diameter of 1-5 μm. However, the alumina and titanium oxide in this coating have poor dispersion uniformity and cannot form a solid solution material, which affects the coating quality.

[0006] CN102627472A discloses a laser near-net-shape forming method for low-porosity alumina titanium ceramic parts. The method used is laser cladding, which can coat or repair small-area workpieces, but is not suitable for large-area coating preparation.

[0007] CN 117282954 A uses powders of molybdenum, nickel, boron, cobalt, aluminum, iron, and silicon, which are prepared by sintering or ultrasonic gas atomization. This method is energy-intensive, and the powder after crushing is cone-shaped and has poor flowability.

[0008] Currently, spray granulation technology is a common method for preparing spray powder. However, the selection of powder composition, dispersants and binders during granulation, and spray industrial parameters are key factors. Spray granulation generally suffers from high cost, poor uniformity, numerous pores, poor powder sphericity, and low flowability.

[0009] CN 117430977 A discloses a method for preparing yttrium oxyfluoride spraying powder and the yttrium oxyfluoride spraying powder itself. The method involves mixing yttrium hydroxide as a raw material with hydrofluoric acid to first prepare yttrium oxyfluoride crystals, which are then calcined, ground, and granulated by atomization to obtain the yttrium oxyfluoride spraying powder. This method is a commonly used technique for preparing spraying powders, but the binder used is a modified collagen-based binder, which is costly.

[0010] CN 117263695 A discloses a radar absorbing composite material and its preparation method. It uses micron-sized SiC and ZnO as raw materials, and polyvinyl alcohol, polyacrylic acid, and polyvinyl ketone as binders. After slurry preparation, it is spray-granulated to obtain a porous sprayable powder with a diameter of 50 μm. The binders used in this method are costly, and the sprayable powder prepared by this method has a high porosity, which affects the powder adhesion rate during spraying.

[0011] CN 117403175 A discloses a nickel-lanthanum oxide-nano titanium dioxide composite coating, its preparation method, and its application. Sodium polyphosphate is used as a dispersant, and sodium carboxymethyl cellulose solution is used as a binder. The dispersant is mixed with nano-titanium dioxide and deionized water, mechanically stirred, and the resulting slurry is spray-granulated. After heat treatment, nano-titanium dioxide agglomerates are obtained, which are then mixed with metallic nickel powder and lanthanum oxide powder to obtain a mixed feed powder. The substrate surface after sandblasting and dust removal is then sequentially plasma-sprayed with a base coat and a composite coating to obtain the nickel-lanthanum oxide-nano titanium dioxide composite coating. In this method, the titanium dioxide agglomerates are directly mixed with metallic nickel powder and lanthanum oxide powder, which easily leads to uneven coating composition during spraying.

[0012] CN 117089228 A discloses a thermal barrier ceramic composite coating and its preparation method, which uses LaMgAl 11 O 19 Powder, FeSiAl powder, water, ammonium citrate, and gum arabic are ball-milled to obtain a first slurry. The first slurry is then spray-granulated to obtain spherical agglomerated powder, which is then sprayed onto the substrate using atmospheric plasma spraying technology to form a thermal barrier coating. Existing technologies using thermally sprayed powders suffer from poor flowability and low sphericity, and the uneven composition of the sprayed powder results in poor coating hardness and wear resistance.

[0013] Therefore, how to develop a rare earth-doped alumina titanium spraying material, its coating and preparation method to improve the wear resistance of the thermal spray coating formed by the thermal spraying powder is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0014] In view of this, the present invention provides a rare earth-doped alumina titanium spraying material, its coating and preparation method thereof.

[0015] To achieve the above objectives, the present invention adopts the following technical solution:

[0016] A rare earth-doped alumina-titanium spraying material is prepared from the following raw materials in parts by weight: 0.01-5 parts lanthanum cerium carbonate, 3-40 parts titanium oxide, 0.1-2 parts hydroxyethyl cellulose, 0.01-0.5 parts dodecyl benzyl ammonium chloride, 1-3 parts n-heptane, 150-220 parts deionized water, 100 parts alumina, and 0.05-3 parts gum arabic.

[0017] The beneficial effects of this invention are as follows: Compared with existing sintering and electric furnace melting-crushing methods, the rare earth-doped alumina titanium spraying material prepared by this invention has lower energy consumption, and the prepared spraying material has high sphericity and good flowability. Due to the application of rare earth elements in traditional alumina titanium materials, the sprayed coating exhibits refined grain structure, purified grain boundary structure, and solid solution strengthening. Hydroxyethyl cellulose has excellent dispersing properties, reducing powder agglomeration and shortening grinding time during fine grinding in a sand mill. Gum powder acts as a binder in the spray granulation process, promoting uniform agglomeration between particles. Simultaneously, the hydroxyethyl cellulose added during grinding has a film-forming effect, improving the sphericity of the powder during spray granulation. During grinding, the increased viscosity after powder refinement leads to numerous air bubbles, affecting the grinding process; the addition of n-heptane can defoam. This invention offers low preparation cost, controllable particle size, good flowability, and a coating with high hardness and good wear resistance.

[0018] This invention also provides a method for preparing rare earth-doped alumina titanium spraying material, comprising the following steps:

[0019] (1) Weigh each raw material according to the above rare earth doped alumina titanium spraying material, and divide the deionized water into two parts.

[0020] (2) Lanthanum cerium carbonate, titanium dioxide, hydroxyethyl cellulose, dodecyl benzyl ammonium chloride, n-heptane, deionized water (part 1) and alumina are mixed and finely ground in a nano-sand mill at room temperature to obtain a mixed slurry;

[0021] (3) Mix the peach gum powder and the second part of deionized water, heat and keep warm to obtain a peach gum powder solution. The mass ratio of peach gum powder and the second part of deionized water is 1:(3.5-5). Add the obtained mixed slurry to the peach gum powder solution and stir at room temperature. Then spray granulation to obtain the precursor powder.

[0022] (4) The obtained precursor powder is calcined at high temperature to obtain spherical spray powder, namely the rare earth doped alumina titanium spray material.

[0023] The beneficial effects of this invention are as follows: The thorough grinding of raw materials before spray granulation allows for a full solid-phase reaction of each material during the subsequent sintering and spraying processes, resulting in a dispersion strengthening effect on the coating and improving its hardness and wear resistance.

[0024] Furthermore, in step (2), the above-mentioned cyclic fine grinding process is divided into two steps. First, fine grinding is carried out for 30-40 minutes with zirconium beads of 0.3 mm in diameter and the speed of the sand mill is 1500-2000 r / min. Then, fine grinding is carried out for 60-90 minutes with zirconium beads of 0.1 mm in diameter and the speed of the sand mill is 2000-2500 r / min.

[0025] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the first fine grinding can grind the material to below 2μm, and the second fine grinding can grind the material particle size to the nanoscale.

[0026] Furthermore, in step (2), the mass ratio of zirconium beads to alumina in the sand mill is (1-3):1. The beneficial effects of adopting the above-mentioned further technical solution are: ensuring the fineness of the powder while reducing the grinding time.

[0027] Furthermore, in step (3), the above-mentioned 400-800 r / min is stirred for 30 min.

[0028] The beneficial effect of adopting the above-mentioned further technical solution is that it can make the peach gum and the slurry fully and evenly mixed.

[0029] Furthermore, in step (3), the inlet air temperature of the spray granulation is 120-220℃, the outlet air temperature is 60-100℃, the feed rate is 30-45mL / min, and the rotation speed is 11000-15000r / min.

[0030] The beneficial effect of adopting the above-mentioned further technical solutions is that the particle size of granulated powder can be accurately controlled.

[0031] Furthermore, in step (4), the high-temperature calcination temperature is 1000-1300℃ and the high-temperature calcination time is 3h.

[0032] The beneficial effects of adopting the above-mentioned further technical solutions are: it can fully decompose and volatilize the organic matter in the granulated powder, and at the same time, it can cause the rare earth, aluminum and titanium in the granulated powder to undergo solid-phase reaction.

[0033] Furthermore, in step (4), the median particle size D50 of the above spherical spray powder is 40-60 μm.

[0034] The beneficial effects of adopting the above-mentioned further technical solutions are: to ensure that the sprayed powder passes smoothly and evenly through the plasma spraying powder feeder, thus guaranteeing uniform coating quality.

[0035] The present invention also provides a method for preparing a rare earth-doped alumina titanium coating, wherein the above-mentioned rare earth-doped alumina titanium spraying material is used to spray the coating using a plasma spraying process to obtain a wear-resistant coating, namely the above-mentioned rare earth-doped alumina titanium coating.

[0036] The beneficial effects of this invention are: the wear-resistant coating has a hardness of HV0.1 of 900-1200, and the volumetric wear rate is less than 2×10⁻⁶. -4 mm 3 / N·min (load 100N, frequency 5Hz, test time 120min).

[0037] Furthermore, the process parameters for the above-mentioned plasma spraying process are as follows: spraying power of 15-32KW, voltage of 40-55V, current of 360-560A, argon gas flow rate of 25-45L / min, powder feeding rate of 40-60g / min, spraying distance of 10-25cm, and coating thickness of 80-150μm. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 Micrograph of rare earth-doped alumina titanium spraying material in Example 1;

[0040] Figure 2 Micrograph of the sprayed material in Comparative Example 1;

[0041] Figure 3 Micrograph of the sprayed material in Comparative Example 2;

[0042] Figure 4 This is a micrograph of the sprayed material for Comparative Example 3. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] Rare earth-doped titanium alumina coating includes the following steps:

[0046] (1) Weigh out 0.003 kg of lanthanum cerium carbonate, 0.9 kg of titanium dioxide, 0.05 kg of hydroxyethyl cellulose, 0.01 kg of dodecyl benzyl ammonium chloride, 0.1 kg of n-heptane, 15.4 kg of deionized water, 10 kg of alumina, and 0.1 kg of peach gum powder. Divide the deionized water into two parts.

[0047] (2) Lanthanum cerium carbonate, titanium dioxide, hydroxyethyl cellulose, dodecyl benzyl ammonium chloride, n-heptane, 15 kg of deionized water and alumina were mixed and placed in a nano-grinding mill and finely ground at room temperature. The fine grinding process was divided into two steps. First, the material was finely ground for 30 min with zirconium beads with a particle size of 0.3 mm at a mill speed of 1800 r / min until the median particle size D50 was 1.6 μm. Then, the material was finely ground for 90 min with zirconium beads with a particle size of 0.1 mm at a mill speed of 2500 r / min until the particle size was finely ground to 159 nm. The mass ratio of zirconium beads to alumina in the mill was 2.2:1 to obtain a mixed slurry.

[0048] (3) Add the peach gum powder to the remaining 0.4 kg of deionized water, keep warm at 90℃ for 3 h, and cool to obtain a peach gum powder solution. Add the obtained mixed slurry to the peach gum powder solution and stir at room temperature. The stirring speed is 600 r / min and the stirring time is 30 min. Spray granulation is then performed. The inlet air temperature for spray granulation is 125℃, the outlet air temperature is 75℃, the feed rate is 30 mL / min, and the rotation speed is 12000 r / min to obtain the precursor powder.

[0049] (4) The obtained precursor powder was subjected to high-temperature calcination at 1000℃ for 3 hours to obtain spherical spray powder with a median particle size D50 of 45μm, namely rare earth-doped alumina titanium oxide spray material. A micrograph of the spray material is shown below. Figure 1 ;

[0050] (5) Rare earth-doped alumina titanium coating material was used for plasma spraying. The plasma spraying process parameters were: spraying power of 18.29KW, voltage of 43.6V, current of 419.9A, argon gas flow rate of 40L / min, powder feeding rate of 50g / min, spraying distance of 15cm, and coating thickness of 150μm. A wear-resistant coating, namely rare earth-doped alumina titanium coating, was obtained. The wear-resistant coating had a hardness HV0.1 of 950 and a volumetric wear rate of 1.9×10⁻⁶. -4 mm 3 / N·min. On a tribological testing machine, a silicon nitride ball with a diameter of 0.5mm was used to rotate and rub the wear-resistant coating. The applied load pressure was 100N, the frequency was 5HZ, and the friction time was 120min. The wear rate value was obtained after the experiment.

[0051] Example 2

[0052] Rare earth-doped titanium alumina coating includes the following steps:

[0053] (1) Weigh out 0.0025 kg of lanthanum cerium carbonate, 0.75 kg of titanium dioxide, 0.04 kg of hydroxyethyl cellulose, 0.08 kg of dodecyl benzyl ammonium chloride, 0.08 kg of n-heptane, 12.62 kg of deionized water, 8.1 kg of alumina, and 0.078 kg of peach gum powder. Divide the deionized water into two parts.

[0054] (2) Lanthanum cerium carbonate, titanium dioxide, hydroxyethyl cellulose, dodecyl benzyl ammonium chloride, n-heptane, 12.3 kg of deionized water and alumina were mixed and placed in a nano-grinding mill for fine grinding at room temperature. The fine grinding process was divided into two steps. First, the material was finely ground for 40 min with zirconium beads with a particle size of 0.3 mm at a mill speed of 1900 r / min until the median particle size D50 was 1.5 μm. Then, the material was finely ground for 80 min with zirconium beads with a particle size of 0.1 mm at a mill speed of 2350 r / min until the particle size was finely ground to 172 nm.

[0055] (3) Add the peach gum powder to the remaining 0.32 kg of deionized water, keep it at 90℃ for 3 h, and cool it to obtain a peach gum powder solution. Add the obtained mixed slurry to the peach gum powder solution and stir at room temperature. The stirring speed is 800 r / min and the stirring time is 30 min. Spray granulation is carried out. The inlet air temperature of spray granulation is 140℃, the outlet air temperature is 85℃, the feeding speed is 35 mL / min, and the speed is 13000 r / min to obtain the precursor powder.

[0056] (4) The obtained precursor powder was calcined at high temperature. The high temperature calcination temperature was 1000℃ and the high temperature calcination time was 3h to obtain spherical spray powder with a median particle size D50 of 43.8μm, namely rare earth doped alumina titanium spray material.

[0057] (5) Rare earth-doped alumina titanium coating material was used for plasma spraying. The plasma spraying process parameters were: spraying power of 28.6KW, voltage of 52.5V, current of 544.7A, argon gas flow rate of 45L / min, powder feeding rate of 50g / min, spraying distance of 18cm, and coating thickness of 150μm. A wear-resistant coating, namely rare earth-doped alumina titanium coating, was obtained. The wear-resistant coating had a hardness HV0.1 of 985 and a volumetric wear rate of 1.6×10⁻⁶. -4 mm 3 / N·min (test method is the same as in Example 1).

[0058] Example 3

[0059] Rare earth-doped titanium alumina coating includes the following steps:

[0060] (1) Weigh out 0.32 kg of lanthanum cerium carbonate, 2.5 kg of titanium dioxide, 0.15 kg of hydroxyethyl cellulose, 0.03 kg of dodecyl benzyl ammonium chloride, 0.15 kg of n-heptane, 18.8 kg of deionized water, 10 kg of alumina, and 0.25 kg of peach gum powder. Divide the deionized water into two parts.

[0061] (2) Lanthanum cerium carbonate, titanium dioxide, hydroxyethyl cellulose, dodecyl benzyl ammonium chloride, n-heptane, 18 kg of deionized water, and alumina were mixed and finely ground in a nano-grinding mill at room temperature. The fine grinding process consisted of two steps: first, the material was finely ground for 35 min with 0.3 mm zirconium beads at a mill speed of 1600 r / min until the median particle size D50 was 1.75 μm; then, it was finely ground for 90 min with 0.1 mm zirconium beads at a mill speed of 2200 r / min until the particle size was reduced to 183 nm. The mass ratio of zirconium beads to alumina in the mill was 2.1:1 to obtain a mixed slurry.

[0062] (3) Add the peach gum powder to the remaining 0.8 kg of deionized water, keep it at 90℃ for 3 h, and cool it to obtain a peach gum powder solution. Add the obtained mixed slurry to the peach gum powder solution and stir at room temperature. The stirring speed is 400 r / min and the stirring time is 30 min. Spray granulation is then carried out. The inlet air temperature of spray granulation is 150℃, the outlet air temperature is 90℃, the feed rate is 35 mL / min, and the rotation speed is 15000 r / min to obtain the precursor powder.

[0063] (4) The obtained precursor powder was calcined at high temperature. The high temperature calcination temperature was 1300℃ and the high temperature calcination time was 3h to obtain spherical spray powder with a median particle size D50 of 41.3μm, namely rare earth doped alumina titanium spray material.

[0064] (5) Rare earth-doped alumina titanium coating material was used for plasma spraying. The plasma spraying process parameters were: spraying power of 26.5KW, voltage of 50.5V, current of 254.7A, argon gas flow rate of 45L / min, powder feeding rate of 50g / min, spraying distance of 20cm, and coating thickness of 150μm. A wear-resistant coating, namely rare earth-doped alumina titanium coating, was obtained. The wear-resistant coating had a hardness HV0.1 of 990 and a volumetric wear rate of 1.5×10⁻⁶. -4 mm 3 / N·min (test method is the same as in Example 1).

[0065] Comparative Example 1

[0066] Compared with Example 1, other conditions remained unchanged. In step (2), only the first fine grinding was performed for 15 minutes, and no second fine grinding was performed. The median particle size of the obtained spray powder was 45.6 μm. The spraying conditions were the same as in Example 1. The obtained coating had a hardness HV0.1 of 875 and a volumetric wear rate of 2.6 × 10⁻⁶. -4 mm 3 / N·min (experimental method same as in Example 1), the powder obtained in Comparative Example 1 is as follows: Figure 2 As shown.

[0067] Comparative Example 2

[0068] Compared to Example 1, with other conditions unchanged, hydroxyethyl cellulose was not added to the mixed slurry. The resulting spray powder had uneven particle size, numerous surface pores, poor flowability, and caused powder jamming during spraying, making it impossible to complete the spraying process. The powder obtained in Comparative Example 2 was... Figure 3 As shown.

[0069] Comparative Example 3

[0070] Compared to Example 1, with other conditions unchanged, the spray granulation process did not add gum powder, resulting in a fine, non-spherical, and unevenly shaped spray powder with poor flowability, making it impossible to complete the spraying process. Figure 4 As shown.

[0071] Comparative Example 4

[0072] Commercially available titanium alumina (AT20) was used, and the spraying conditions were the same as in Example 2. The wear-resistant coating had a hardness HV0.1 of 855 and a volumetric wear rate of 2.6 × 10⁻⁶. -4 mm 3 / N·min (test method is the same as in Example 1).

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rare earth-doped alumina-titanium spraying material, characterized in that, It is prepared from the following raw materials in parts by weight: 0.01-5 parts lanthanum cerium carbonate, 3-40 parts titanium dioxide, 0.1-2 parts hydroxyethyl cellulose, 0.01-0.5 parts dodecyl benzyl ammonium chloride, 1-3 parts n-heptane, 150-220 parts deionized water, 100 parts alumina, and 0.05-3 parts gum arabic. The preparation method of the rare earth-doped alumina titanium spraying material includes the following steps: (1) Weigh each raw material according to the rare earth doped alumina titanium spraying material, and divide the deionized water into two parts; (2) Lanthanum cerium carbonate, titanium dioxide, hydroxyethyl cellulose, dodecyl benzyl ammonium chloride, n-heptane, deionized water (part 1) and alumina are mixed and finely ground in a nano-sand mill at room temperature to obtain a mixed slurry; (3) Mix the peach gum powder and the second part of deionized water, heat and keep warm to obtain a peach gum powder solution. The mass ratio of peach gum powder and the second part of deionized water is 1: (3.5-5). Add the obtained mixed slurry to the peach gum powder solution and stir at room temperature. Then spray granulation to obtain the precursor powder. (4) The obtained precursor powder is calcined at high temperature to obtain spherical spray powder, namely the rare earth doped alumina titanium spray material. In step (2), the cyclic fine grinding process is divided into two steps. First, fine grinding is carried out for 30-40 minutes with zirconium beads of 0.3 mm in diameter and the speed of the sand mill is 1500-2000 r / min. Then, fine grinding is carried out for 60-90 minutes with zirconium beads of 0.1 mm in diameter and the speed of the sand mill is 2000-2500 r / min.

2. The rare earth-doped alumina titanium spraying material according to claim 1, characterized in that, In step (2), the mass ratio of zirconium beads to alumina in the sand mill is (1-3):

1.

3. The rare earth-doped alumina titanium spraying material according to claim 1, characterized in that, In step (3), the stirring speed is 400-800 r / min and the stirring time is 30 min.

4. The rare earth-doped alumina titanium spraying material according to claim 1, characterized in that, In step (3), the inlet air temperature of the spray granulation is 120-220℃, the outlet air temperature is 60-100℃, the feed rate is 30-45mL / min, and the rotation speed is 11000-15000r / min.

5. The rare earth-doped alumina titanium spraying material according to claim 1, characterized in that, In step (4), the high-temperature calcination temperature is 1000-1300℃ and the high-temperature calcination time is 3h.

6. The rare earth-doped alumina titanium spraying material according to claim 1, characterized in that, In step (4), the median particle size D50 of the spherical spray powder is 40-60 μm.

7. A method for preparing a rare earth-doped alumina titanium coating, characterized in that, Using the rare earth-doped alumina titanium spraying material as described in claim 1, a wear-resistant coating is obtained by plasma spraying process, namely the rare earth-doped alumina titanium coating.

8. The method for preparing a rare earth-doped alumina titanium coating according to claim 7, characterized in that, The plasma spraying process parameters are as follows: spraying power of 15-32KW, voltage of 40-55V, current of 360-560A, argon gas flow rate of 25-45L / min, powder feeding rate of 40-60g / min, spraying distance of 10-25cm, and coating thickness of 80-150μm.

Images