Method for plasma spraying of reciprocating wear-resistant ceramic composite coating

Abstract

The invention provides a method for plasma spraying of a reciprocating-wear-resistant ceramic composite coating, which comprises the following steps: uniformly mixing Cr2O3 powder, Al2O3 powder and Y2O3 powder according to the mass percentage of W1, W2 and W3 to form mixed ceramic powder (0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt and 0 lt); w3 / (W1 + W2 + W3) < = 0.50 and W1 / W2 = 4; the base body is pretreated; a Ni-Cr bonding layer is sprayed on the pretreated base body; and the mixed ceramic powder is deposited on the Ni-Cr bonding layer through atmospheric plasma spraying, and the ceramic composite coating is formed. The Ni-Cr bonding layer is firstly deposited between the base body and the ceramic composite coating, effective combination of the coating and the base body is facilitated, and the reciprocating wear resistance of the ceramic composite coating can be improved by adding the Y2O3 powder with the high melting point, the high heat conductivity and the good wear resistance into the Cr2O3-Al2O3 powder.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant coatings, in particular to a method for plasma spraying a ceramic composite coating resistant to reciprocating wear. Background Art

[0002] Atmospheric plasma spraying technology is a highly efficient part surface strengthening and modification technology. Its principle is to use a plasma jet to heat the spray material to a molten or semi-molten state. Subsequently, the spray material hits the surface of the substrate under the action of a high-speed airflow, spreads into a flat shape, and then quickly cools and solidifies, stacking layer by layer to form a dense coating. This technology is also the earliest and most widely used thermal spray technology. The chromium oxide ceramic coating deposited by atmospheric plasma spraying technology has good wear resistance, corrosion resistance and high-temperature oxidation resistance, and is widely used in many fields such as aerospace, engineering machinery, energy and electricity, transportation, etc.

[0003] Reciprocating wear mainly exists in mechanical parts such as pistons and cylinders that need to work back and forth. The damage caused by it is often large-scale and the consequences are very serious. For example, the yarn guide wheel of a textile machine will have reciprocating friction with the yarn, which will cause the yarn guide wheel to wear over a long period of time, making the transmission of the yarn unstable and affecting the working efficiency of the entire spinning process.

[0004] Cr 2 O 3 -Al 2 O 3 The appearance of coating has slowed down the wear of the guide wheel to a certain extent, but its wear resistance is still not enough to meet actual needs.

[0005] Therefore, how to further improve Cr 2 O 3 -Al 2 O 3 The reciprocating wear resistance of the coating is a key issue that needs to be solved in this field. Summary of the invention

[0006] The invention provides a method for plasma spraying a ceramic composite coating resistant to reciprocating wear, aiming at obtaining the ceramic composite coating resistant to reciprocating wear.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The invention discloses a method for plasma spraying a ceramic composite coating resistant to reciprocating wear, comprising the steps of: 2 O 3 、Al 2 O 3 , Y 2 O 3The three powders are divided into the following groups according to their mass percentage: W 1 , W 2 , W 3 The mass ratio of W is uniformly mixed to form a mixed ceramic powder, wherein 0≤W 3 / (W 1 +W 2 +W 3 )≤0.50 and W 1 / W 2 =4; pretreating the substrate; spraying a Ni-Cr bonding layer on the pretreated substrate; and depositing the mixed ceramic powder on the Ni-Cr bonding layer using atmospheric plasma spraying to form a ceramic composite coating.

[0009] Preferably, the method further comprises the step of polishing the ceramic composite coating.

[0010] As a preference, 0≤W 3 / (W 1 +W 2 +W 3 )≤0.05,0.05 <W 3 / (W 1 +W 2 +W 3 )≤0.10、0.10 <W 3 / (W 1 +W 2 +W 3 )≤0.20、0.20 <W 3 / (W 1 +W 2 +W 3 )≤0.30,0.30 <W 3 / (W 1 +W 2 +W 3 )≤0.50、0≤W 3 / (W 1 +W 2 +W 3 )≤0.30 or 0.05≤W 3 / (W 1 +W 2 +W 3 )≤0.20.

[0011] Preferably, in the mixed ceramic powder, Cr 2 O 3 、Al 2 O 3 , Y 2 O 3 The mass fraction is 80% Cr 2 O3 -20% Al 2 O 3 , 5% Y 2 O 3 -76%Cr 2 O 3 -19% Al 2 O 3 , 10% Y 2 O 3 -72%Cr 2 O 3 -18% Al 2 O 3 , 20% Y 2 O 3 -64%Cr 2 O 3 -16% Al 2 O 3 、30%Y 2 O 3 -56%Cr 2 O 3 -14% Al 2 O 3 or 50% Y 2 O 3 -40% Cr 2 O 3 -10%Al 2 O 3 .

[0012] Preferably, the particle size of the mixed ceramic powder is 15-45 μm.

[0013] Preferably, the Ni-Cr bonding layer has a thickness of 20-60 μm.

[0014] Preferably, the atmospheric plasma spraying uses a plasma spray gun with a spraying angle of 90°, a spraying distance of 100-120 mm, and a powder feeding amount of 40-50 g / min.

[0015] Preferably, the thickness of the ceramic composite coating is 300-400 μm.

[0016] In summary, the present invention has at least the following beneficial effects:

[0017] First, a Ni-Cr bonding layer is deposited between the substrate and the ceramic composite coating, which is conducive to the effective bonding of the coating and the substrate;

[0018] Second, the atmospheric plasma spraying technology is simple and fast to operate, the process parameters are controllable, the coating deposition efficiency is high, and it is environmentally friendly;

[0019] Third, Y with high melting point, high thermal conductivity and good wear resistance 2 O 3 Powder added to Cr 2 O 3 -Al 2 O 3 Powder can improve the reciprocating wear resistance of ceramic composite coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of plasma spraying using equipment according to some embodiments of the present specification.

[0022] Figure numerals: 1, anode; 2, cathode; 3, powder feeding pipe; 4, plasma jet; 5, ceramic composite coating; 6, substrate; 7, spray gun; 8, mixed ceramic powder.

[0023] Figure 2 is a flowchart of method 200 according to some embodiments of the present specification.

[0024] Figure 3 In this manual, different Y 2 O 3 Cr content 2 O 3 -Al 2 O 3 -Y 2 O 3 Friction coefficient of ceramic composite coatings.

[0025] Figure 4 In this manual, Cr 2 O 3 -Al 2 O 3 -Y 2 O 3 The wear rate of ceramic composite coating increases with Y 2 O 3 Changes in content.

[0026] Figure 5 80% Cr in Example 1 of this specification 2 O 3 -20% Al 2 O 3(Indicated by CA) SEM (scanning electron microscope) image of the cross section of the ceramic composite coating.

[0027] Figure 6 5% Y in Example 2 of this specification 2 O 3 -76%Cr 2 O 3 -19% Al 2 O 3 (Indicated by CAY5) SEM image of the cross section of the ceramic composite coating.

[0028] Figure 7 10% Y in Example 3 of this specification 2 O 3 -72%Cr 2 O 3 -18% Al 2 O 3 (Indicated by CAY10) SEM image of the cross section of the ceramic composite coating.

[0029] Figure 8 20% Y in Example 4 of this specification 2 O 3 -64%Cr 2 O 3 -16% Al 2 O 3 (Indicated by CAY20) SEM image of the cross section of the ceramic composite coating.

[0030] Fig. 9 30% Y in Example 5 of this specification 2 O 3 -56%Cr 2 O 3 -14% Al 2 O 3 (Indicated by CAY30) SEM image of the cross section of the ceramic composite coating.

[0031] Fig.10 50% Y in Example 6 of this specification 2 O 3 -40% Cr 2 O 3 -10%Al 2 O 3 (Indicated by CAY50) SEM image of the cross section of the ceramic composite coating. DETAILED DESCRIPTION

[0032] For the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] The disclosure below provides many different implementations or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity, and does not in itself indicate that the various implementations and / or or the relationship between settings.

[0034] Figure 1 Schematic diagram of plasma spraying using equipment in some embodiments of this specification. Figure 1 As shown, the equipment used for plasma spraying in the embodiment of this specification includes an anode 1, a cathode 2, a powder delivery pipe 3 and a spray gun 7.

[0035] In some embodiments, the anode 1 may be a nozzle, the cathode 2 may be an electrode, the anode 1 and the cathode 2 may form an arc to generate a high temperature plasma with a temperature of 10000 to 16000 K, and control the direction and shape of the plasma jet.

[0036] In some embodiments, the powder delivery pipe 3 delivers the mixed ceramic powder 8 to the plasma jet 4 for melting the mixed ceramic powder 8 through a carrier gas. In some embodiments, the carrier gas may be Ar gas or N 2 gas, or other inert gases.

[0037] The molten mixed ceramic powder 8 can form a dense ceramic composite coating 5 on the surface of the substrate 6. 。

[0038] The spray gun 7 is used to control the plasma jet 4 and the spraying process. In some embodiments, the spray gun 7 can integrate the anode 1, the cathode 2, and the powder delivery pipe 3 into one.

[0039] Figure 2 is a flowchart of method 200 according to some embodiments of the present specification.

[0040] Step 210, prepare mixed ceramic powder 8. In some embodiments, Cr 2 O 3 、Al 2 O 3 , Y 2 O3 The three powders are W 1 , W 2 , W 3 The mass ratio of 0≤W is uniformly mixed to form a mixed ceramic powder 8, wherein 0≤W 3 / (W 1 +W 2 +W 3 )≤0.50 and W 1 / W 2 =4. 1 Cr 2 O 3 Mass percentage in mixed ceramic powder 8, W 2 For Al 2 O 3 Mass percentage in mixed ceramic powder 8, W 3 Y 2 O 3 Mass percentage in mixed ceramic powder 8.

[0041] Unless otherwise specified, the raw materials used in the examples of this specification are all commercially available products, among which: Cr 2 O 3 Powder, particle size 15-45μm, purity 99.9%; Al 2 O 3 Powder, particle size 15-45μm, purity 99.9%; Y 2 O 3 Powder, particle size 15-45μm, purity 99.9%.

[0042] Step 220, pre-treating the substrate 6. In some embodiments, the pre-treating may include cleaning, drying, grinding, polishing, sandblasting, and the like.

[0043] In some embodiments, the pretreatment process of the substrate 6 is specifically as follows: the substrate 6 is placed in an ultrasonic cleaner for cleaning for 30 minutes, and the medium is TJ-5 strong metal cleaning agent; after cleaning, the substrate 6 is placed in an oven for drying for 2 hours to remove the surface liquid of the substrate 6, and the substrate 6 is taken out after drying; after the substrate 6 is cooled to room temperature, it is ground and polished to ensure that the roughness of the substrate 6 is 4-5μm, which will be beneficial to the bonding of the Ni-Cr bonding layer and the substrate 6.

[0044] In step 220, the blasting material used in the blasting process can be 46# white corundum sand. The sandblasting pressure may be 0.35 MPa, and the sandblasting angle may be 75°-85°. The sandblasting angle refers to the angle between the sandblasting direction and the tangent line of the surface of the substrate 6 at the sandblasting position.

[0045] Step 230 , spraying a Ni—Cr bonding layer on the pre-treated substrate 6 .

[0046] In the process of depositing the ceramic composite coating 5 by atmospheric plasma spraying, due to the large difference in thermal expansion coefficients between the ceramic composite coating 5 and the substrate 6, the substrate 6 and the ceramic composite coating 5 will expand to different degrees, thereby causing an imbalance in residual stress inside the ceramic composite coating 5, and then a thermal stress mismatch phenomenon will occur, which is not conducive to the ceramic composite coating 5. In order to solve this problem, after completing the pretreatment of the substrate 6, the embodiment of this specification deposits a Ni-Cr bonding layer with a thickness of 20-60μm on the surface of the substrate 6 by spraying.

[0047] Step 240 , depositing the mixed ceramic powder 8 on the Ni—Cr bonding layer by atmospheric plasma spraying to form a ceramic composite coating 5 .

[0048] The spray gun 7 used for atmospheric plasma spraying is a plasma spray gun, with a spray angle of 90°, a spray distance of 100-120 mm, and a powder feeding rate of 40-50 g / min. The spray angle refers to the angle between the plasma jet 4 and the tangent line at the spray position of the substrate 6 surface.

[0049] It should be noted that the above description of the process method is only for example and explanation, and does not limit the scope of application of this specification. For those skilled in the art, various modifications and changes can be made to the process method under the guidance of this specification. However, these modifications and changes are still within the scope of this specification.

[0050] For example, in some embodiments, step 210 may be adjusted between step 220 and step 230. For another example, in some embodiments, step 210 may be adjusted between step 230 and step 240.

[0051] The embodiments of the present specification are further described below in conjunction with the accompanying drawings.

[0052] Embodiment 1:

[0053] Step 1: prepare mixed ceramic powder.

[0054] Cr 2 O 3 Powder and Al 2 O 3 The powders are mixed evenly in a mass percentage of 4:1 to obtain mixed ceramic powder for later use;

[0055] Step 2: pre-treat the substrate.

[0056] The substrate was cleaned with an ultrasonic cleaner for 30 minutes and then dried in an oven at 20-80°C. After drying, the substrate surface was ground, polished and sandblasted. The sandblasting material was 46# white corundum sand, the sandblasting pressure was 0.35MPa, and the sandblasting angle was 75°-85°, so that the substrate surface roughness was 4-5μm.

[0057] Step three: spray deposit a Ni-Cr bonding layer.

[0058] A Ni-Cr bonding layer is sprayed and deposited on the substrate after the pretreatment.

[0059] Step 4: spraying ceramic composite coating.

[0060] Cr is fed by a single-channel powder feeding method 2 O 3 With Al 2 O 3 The prepared mixed ceramic powder was fed into the plasma arc, and the powder feeding device was adjusted so that the powder feeding tube was perpendicular to the nozzle, the spraying angle was 90°, the spraying distance was 110 mm, the powder feeding amount was 45 g / min, the main gas flow was argon with a flow rate of 35 L / min, the secondary gas flow was hydrogen with a flow rate of 8 L / min, the current was 600 A, the voltage was 68 V, and the spray gun speed was 600 mm / s.

[0061] Step 5: Cool the sprayed ceramic composite coating in air, and then observe the cross-sectional morphology of the ceramic composite coating using a scanning electron microscope.

[0062] Figure 5 80% Cr in Example 1 of this specification 2 O 3 -20% Al 2 O 3 SEM (scanning electron microscope) image of the cross section of the ceramic composite coating. Figure 5 80% Cr in Example 1 of this specification 2 O 3 -20% Al 2 O 3 SEM image of the cross section of the ceramic composite coating. Figure 5 It can be seen that the substrate, Ni-Cr bonding layer, The three components of the ceramic composite coating are well bonded, the layered structure is obvious, and the thickness of the ceramic composite coating is 300-400 μm.

[0063] Step 6: Use MTF-5000 multifunctional friction and wear tester to conduct reciprocating friction and wear test on the ceramic composite coating prepared by atmospheric plasma spraying, where the load is 10N, the stroke is 10mm, the reciprocating speed is 20mm / s, the time is 1h, and the grinding ball is Si 3N 4 , using VR-3200 3D profilometer to calculate 80% Cr 2 O 3 -20% Al 2 O 3 (equivalent to 0% Y 2 O 3 -80% Cr 2 O 3 -20% Al 2 O 3 The wear rate of the ceramic composite coating is 25.83×10 -5 mm 3 / N〃m, for relevant data, see Figure 3 and Figure 4 . Figure 3 In this manual, different Y 2 O 3 Cr content 2 O 3 -Al 2 O 3 -Y 2 O 3 The friction coefficient of the ceramic composite coating, the relationship between the friction coefficient of the ceramic composite coating obtained in Example 1 and the reciprocating friction time, as shown in FIG. Figure 3 As shown in the first curve CA from bottom to top. Figure 4 In this manual, different Y 2 O 3 Cr content 2 O 3 -Al 2 O 3 -Y 2 O 3 The wear rate of ceramic composite coating increases with Y 2 O 3 The wear rate of the ceramic composite coating obtained in Example 1 after the aforementioned reciprocating friction and wear test is as follows: Figure 4 As shown in the first column corresponding to CA.

[0064] Embodiment 2:

[0065] The difference between this embodiment and embodiment 1 is that: Cr 2 O 3 Powder and Al 2 O 3 The powders were mixed evenly in a mass ratio of 4:1, recorded as sample 1, and then Y 2 O 3 Powder, where sample 1 and Y 2 O 3 The powder mass ratio is 19:1.

[0066] 5% Y 2 O 3 -76%Cr 2 O 3 -19% Al 2 O 3 The cross-sectional morphology of the ceramic composite coating was observed using a scanning electron microscope. Figure 6 5% Y in Example 2 of this specification 2 O 3 -76%Cr 2 O 3 -19% Al 2 O 3 SEM image of the cross section of the ceramic composite coating. Figure 6 It can be seen that the substrate, bonding layer and ceramic layer are well bonded, the layered structure is obvious, and the coating thickness is 300-400μm.

[0067] 5% Y 2 O 3 -76%Cr 2 O 3 -19% Al 2 O 3 The ceramic composite coating was subjected to a reciprocating friction and wear test with a load of 10N, a stroke of 10mm, a reciprocating speed of 20mm / s, and a time of 1h. The grinding ball was Si 3 N 4 , 5% Y 2 O 3 -76%Cr 2 O 3 -19% Al 2 O 3 The wear rate of the ceramic composite coating is 15.83×10 -5 mm 3 / N〃m, for relevant data, see Figure 3 and Figure 4 The relationship between the friction coefficient of the ceramic composite coating obtained in Example 2 and the reciprocating friction time is as follows: Figure 3 The wear rate of the ceramic composite coating obtained in Example 2 after the aforementioned reciprocating friction and wear test is shown in FIG. Figure 4 As shown in the second column corresponding to CAY5.

[0068] Embodiment 3:

[0069] The difference between this embodiment and embodiment 1 is that: Cr 2 O 3 Powder and Al 2 O 3The powders were mixed evenly in a mass ratio of 4:1, recorded as sample 1, and then Y 2 O 3 Powder, where sample 1 and Y 2 O 3 The powder mass ratio is 9:1.

[0070] 10% Y 2 O 3 -72%Cr 2 O 3 -18% Al 2 O 3 The cross-sectional morphology of the ceramic composite coating was observed using a scanning electron microscope. Figure 7 10% Y in Example 3 of this specification 2 O 3 -72%Cr 2 O 3 -18% Al 2 O 3 SEM image of the cross section of the ceramic composite coating. Figure 7 It can be seen that the substrate, bonding layer and ceramic layer are well bonded, the layered structure is obvious, and the coating thickness is 300-400μm.

[0071] 10% Y 2 O 3 -72%Cr 2 O 3 -18% Al 2 O 3 The ceramic composite coating was subjected to a reciprocating friction and wear test with a load of 10N, a stroke of 10mm, a reciprocating speed of 20mm / s, and a time of 1h. The grinding ball was Si 3 N 4 , 10% Y 2 O 3 -72%Cr 2 O 3 -18% Al 2 O 3 The wear rate of the ceramic composite coating is 5.83×10 -5 mm 3 / N〃m, for relevant data, see Figure 3 and Figure 4 The relationship between the friction coefficient of the ceramic composite coating obtained in Example 3 and the reciprocating friction time is as follows: Figure 3 The wear rate of the ceramic composite coating obtained in Example 3 after the aforementioned reciprocating friction and wear test is shown as follows: Figure 4 As shown in the third column corresponding to CAY10.

[0072] Embodiment 4:

[0073] The difference between this embodiment and embodiment 1 is that: Cr 2 O 3 Powder and Al 2 O 3 The powders were mixed evenly in a mass ratio of 4:1, recorded as sample 1, and then Y 2 O 3 Powder, where sample 1 and Y 2 O 3 The powder mass ratio is 4:1.

[0074] 20% Y 2 O 3 -64%Cr 2 O 3 -16% Al 2 O 3 The cross-sectional morphology of the ceramic composite coating was observed using a scanning electron microscope. Figure 8 20% Y in Example 4 of this specification 2 O 3 -64%Cr 2 O 3 -16% Al 2 O 3 SEM image of the cross section of the ceramic composite coating. Figure 8 It can be seen that the substrate, bonding layer and ceramic layer are well bonded, the layered structure is obvious, and the coating thickness is 300-400μm.

[0075] 20% Y 2 O 3 -64%Cr 2 O 3 -16% Al 2 O 3 The ceramic composite coating was subjected to a reciprocating friction and wear test with a load of 10N, a stroke of 10mm, a reciprocating speed of 20mm / s, and a time of 1h. The grinding ball was Si 3 N 4 , 20% Y 2 O 3 -64%Cr 2 O 3 -16% Al 2 O 3 The wear rate of the ceramic composite coating is 12.78×10 -5 mm 3 / N〃m, for relevant data, see Figure 3 and Figure 4 The relationship between the friction coefficient of the ceramic composite coating obtained in Example 4 and the reciprocating friction time is as follows: Figure 3The wear rate of the ceramic composite coating obtained in Example 3 after the aforementioned reciprocating friction and wear test is shown in FIG. Figure 4 As shown in the 4th column corresponding to CAY20.

[0076] Embodiment 5:

[0077] The difference between this embodiment and embodiment 1 is that: Cr 2 O 3 Powder and Al 2 O 3 The powders were mixed evenly in a mass ratio of 4:1, recorded as sample 1, and then Y 2 O 3 Powder, where sample 1 and Y 2 O 3 The powder mass ratio is 7:3.

[0078] 30% Y 2 O 3 -56%Cr 2 O 3 -14% Al 2 O 3 The cross-sectional morphology of the ceramic composite coating was observed using a scanning electron microscope. Fig. 9 30% Y in Example 5 of this specification 2 O 3 -56%Cr 2 O 3 -14% Al 2 O 3 SEM image of the cross section of the ceramic composite coating. Fig. 9 It can be seen that the substrate, bonding layer and ceramic layer are well bonded, the layered structure is obvious, and the coating thickness is 300-400μm.

[0079] 30% Y 2 O 3 -56%Cr 2 O 3 -14% Al 2 O 3 The ceramic composite coating was subjected to a reciprocating friction and wear test with a load of 10N, a stroke of 10mm, a reciprocating speed of 20mm / s, and a time of 1h. The grinding ball was Si 3 N 4 , 30% Y 2 O 3 -56%Cr 2 O 3 -14% Al 2 O 3 The wear rate of the ceramic composite coating is 24.58×10 -5 mm3 / N〃m, for relevant data, see Figure 3 and Figure 4 The relationship between the friction coefficient of the ceramic composite coating obtained in Example 5 and the reciprocating friction time is as follows: Figure 3 The wear rate of the ceramic composite coating obtained in Example 5 after the aforementioned reciprocating friction and wear test is shown in FIG. Figure 4 As shown in the 5th column corresponding to CAY30.

[0080] Embodiment 6:

[0081] The difference between this embodiment and embodiment 1 is that: Cr 2 O 3 Powder and Al 2 O 3 The powders were mixed evenly in a mass ratio of 4:1, recorded as sample 1, and then Y 2 O 3 Powder, where sample 1 and Y 2 O 3 The powder mass ratio is 2:1.

[0082] 50% Y 2 O 3 -40% Cr 2 O 3 -10%Al 2 O 3 The cross-sectional morphology of the ceramic composite coating was observed using a scanning electron microscope. Fig.10 50% Y in Example 6 of this specification 2 O 3 -40% Cr 2 O 3 -10%Al 2 O 3 SEM image of the cross section of the ceramic composite coating. Fig.10 It can be seen that the substrate, bonding layer and ceramic layer are well bonded, the layered structure is obvious, and the coating thickness is 300-400μm.

[0083] 50% Y 2 O 3 -40% Cr 2 O 3 -10%Al 2 O 3 The ceramic composite coating was subjected to a reciprocating friction and wear test with a load of 10N, a stroke of 10mm, a reciprocating speed of 20mm / s, and a time of 1h. The grinding ball was Si 3 N 4 , 50% Y 2 O 3-40% Cr 2 O 3 -10%Al 2 O 3 The wear rate of ceramic composite coating is 25.00×10 -5 mm 3 / N〃m, for relevant data, see Figure 3 and Figure 4 The relationship between the friction coefficient of the ceramic composite coating obtained in Example 6 and the reciprocating friction time is as follows: Figure 3 The wear rate of the ceramic composite coating obtained in Example 6 after the above-mentioned reciprocating friction and wear test is shown as follows: Figure 4 As shown in the sixth column corresponding to CAY50.

[0084] It can be seen from the above embodiments that the ceramic composite coatings of embodiments 2, 3 and 4 have significantly improved reciprocating wear resistance, among which the ceramic composite coating of embodiment 3 has the most significant improvement in reciprocating wear resistance.

[0085] The above-described embodiments are used to illustrate the present invention, not to limit the present invention, so changes in the exemplified values ​​or replacement of equivalent elements should still fall within the scope of the present invention.

[0086] From the above detailed description, it can be understood by those skilled in the art that the present invention can indeed achieve the aforementioned objectives and is in compliance with the provisions of the Patent Law.

[0087] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0088] The basic concepts have been described above. Obviously, for those of ordinary skill in the art who have read this application, the above invention disclosure is only for example and does not constitute a limitation of this application. Although not explicitly stated here, those of ordinary skill in the art may make various modifications, improvements and amendments to this application. Such modifications, improvements and amendments are suggested in this application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of this application.

[0089] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0090] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this application. For example, although the implementation of the various components described above can be embodied in a hardware device, it can also be implemented as a pure software solution, for example, installation on an existing server or mobile device.

[0091] Similarly, it should be noted that in order to simplify the description disclosed in this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of the application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this method of the application should not be interpreted as reflecting the intention that the claimed object requires more features than those explicitly stated in each claim. On the contrary, the subject of the invention should have fewer features than the above single embodiment.

Claims

1. A method for preparing a ceramic composite coating resistant to reciprocating wear by plasma spraying, comprising the steps of: The three powders of Cr2O3, Al2O3 and Y2O3 are uniformly mixed in a mass ratio of W1:W2:W3 to form a mixed ceramic powder, wherein: 0 ≤ W3 / (W1 + W2 + W3) ≤ 0.50 and W1 / W2 = 4; Pre-treating the substrate; Spraying a Ni-Cr bonding layer on the pre-treated substrate; And Depositing the mixed ceramic powder on the Ni-Cr bonding layer by atmospheric plasma spraying to form a ceramic composite coating.

2. The method according to claim 1, characterized in that It further comprises the step of: Polishing the ceramic composite coating.

3. The method according to claim 1, characterized in that 0 ≤ W3 / (W1 + W2 + W3) ≤ 0.05, 0.05 < W3 / (W1 + W2 + W3) ≤ 0.10, 0.10 < W3 / (W1 + W2 + W3) ≤ 0.20, 0.20 < W3 / (W1 + W2 + W3) ≤ 0.30, 0.30 < W3 / (W1 + W2 + W3) ≤ 0.50, 0 ≤ W3 / (W1 + W2 + W3) ≤ 0.30 or 0.05 ≤ W3 / (W1 + W2 + W3) ≤ 0.

20.

4. The method according to claim 3, characterized in that In the mixed ceramic powder, the mass fractions of Cr2O3, Al2O3, and Y2O3 are 80% Cr2O3 - 20% Al2O3, 5% Y2O3 - 76% Cr2O3 - 19% Al2O3, 10% Y2O3 - 72% Cr2O3 - 18% Al2O3, 20% Y2O3 - 64% Cr2O3 - 16% Al2O3, 30% Y2O3 - 56% Cr2O3 - 14% Al2O3, or 50% Y2O3 - 40% Cr2O3 - 10% Al2O3 respectively.

5. The method according to claim 1, characterized in that The particle size value of the mixed ceramic powder is 15 - 45 μm.

6. The method according to claim 1, characterized in that The thickness of the Ni-Cr bonding layer is 20 - 60 μm.

7. The method according to claim 1, characterized in that For the atmospheric plasma spraying, a plasma gun is used, the spraying angle is 90°, the spraying distance is 100 - 120 mm, and the powder feeding rate is 40 - 50 g / min.

8. The method according to claim 1, characterized in that The thickness of the ceramic composite coating is 300 - 400 μm.

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