A low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof

Abstract

The application discloses a kind of low thermal conductivity high reflectivity five-element co-doped ceramic laser protection coating and preparation method thereof, belong to high-energy laser protection technical field.The protective coating includes the adhesive layer and the reflective heat insulation layer of laminated arrangement, adhesive layer is arranged on the surface of base material, reflective heat insulation layer is arranged on the surface of adhesive layer;Wherein, adhesive layer is formed by spraying one of Ni-Al self-bonding powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY;Reflective heat insulation layer is the ceramic coating of five-element co-doped ZrO2, in ceramic coating, base element is ZrO2, doping component is:Y2O3, Gd2O3, Yb2O3, TiO2 And Ta2O5, after doping, material is single cubic phase structure at 25 ℃-1600 ℃.By multiple oxide doping to ZrO2, the coating can maintain cubic phase at room temperature while having lower thermal conductivity and higher reflectivity, can solve the problems of oxidation reflectivity reduction of metal material, mass loss of ablation material and insufficient heat insulation capacity of heat insulation material in laser protection field, prolong service life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-energy laser protection, and particularly relates to a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof. BACKGROUND

[0002] Laser weapons are weapons that use high-energy lasers to accurately shoot at targets at a long distance or to defend against missiles, and have the characteristics of rapidness, flexibility, accuracy and anti-electromagnetic interference. The main attack modes are blinding, perforation and layer cracking, and the damage mechanisms are divided into three types: thermal damage, mechanical damage and radiation damage. The main damage forms of laser weapons are thermal effect damage, mechanical damage and radiation damage. Countries have been competing to research laser weapons, and have initially equipped them. In order to resist the damage caused by this attack means, preparing a laser protection coating on the surface of an object is a simple and efficient response means.

[0003] According to the action mechanism of laser and the incident surface, the corresponding protective coatings are divided into reflective type, heat insulation type and ablation type, and each has its own advantages and disadvantages. The reflective type protection mainly uses metal materials such as Al, Cu and Ag, and the metal reflectivity is high, but generally has the characteristics of low melting point and easy oxidation at high temperature. The oxidation of the metal greatly reduces the reflectivity, thereby limiting the application of metal materials in reflective laser protection. The ablation type protection mainly uses organic materials such as polytetrafluoroethylene and C / C composite materials, which consume laser energy while having obvious mass loss, and the protective performance decreases sharply with use. The heat insulation type protection mainly uses thermal barrier coatings such as YSZ, which uses the low thermal conductivity of the material to reduce the longitudinal transmission of laser energy, but the protective ability is limited, and under the action of strong laser for a long time, the coating is locally ablated and damaged, and stress causes the coating to peel off. Among the reported laser protection coatings, Xu Na et al. prepared Y2O3, Yb2O3 and Gd2O3 co-doped ZrO2 thermal barrier coating materials by atmospheric plasma spraying technology, and the thermal conductivity was only 0.949 W / (K·m) at 1400℃ (Xu Na, Zhang Wei, Li Gang, et al. Y2O3, Yb2O3 and Gd2O3 co-doped zirconia thermal barrier coating materials and coating performance research: China Aerospace Third Professional Information Network 40th Technical Exchange Conference and the 4th Space Power Joint Conference Proceedings--S06 Materials, Processes and Manufacturing Related Technologies [C]. Kunming: China Aerospace Third Professional Information Network, 2019: 9-15.); Yang Wei et al. prepared a new type of rare earth oxide doped YSZ / YSZ multilayer structure thermal barrier coating, and the thermal conductivity of the thermal barrier coating was 1.1-1.16 W / m K, and the infrared thermal reflectivity could reach 48%-55% (Yang Wei, Wang Yufeng. High-infrared-reflectivity rare earth oxide-doped YSZ / YSZ multilayer structure thermal barrier coating [J]. Journal of Aeronautical Materials, 2018, 38(05): 96-101.), but the protective performance of these coatings needs to be further optimized. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application aims to provide a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof, so as to solve the problem of insufficient protection performance of the current laser protection coating.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application discloses a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating, comprising a bonding layer and a reflective thermal insulation layer arranged in a stack, the bonding layer being arranged on the surface of a substrate, and the reflective thermal insulation layer being arranged on the surface of the bonding layer.

[0007] In the bonding layer, one of Ni-Al self-bonding powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY is sprayed; and in the reflective thermal insulation layer, a composite material with ZrO2 as a base element and Y2O3, Gd2O3, Yb2O3, TiO2 and Ta2O5 as doping elements is sprayed.

[0008] Preferably, in the reflective thermal insulation layer, the molar content of ZrO2 is 60% to 70%, the sum of the molar contents of Y2O3 and Yb2O3 is 20% to 35%, the molar ratio of Y2O3 to Yb2O3 is (3-2):(2-1), and the sum of the molar contents of Gd2O3, TiO2 and Ta2O5 is 5% to 10%, and the molar ratio of the three is equal.

[0009] Preferably, the reflective thermal insulation layer has a cubic phase structure at 25℃ to 1600℃.

[0010] Preferably, the thickness of the bonding layer is 50 to 300μm, and the thickness of the reflective thermal insulation layer is 100 to 450μm.

[0011] In a second aspect, the present application discloses a preparation method of the above-mentioned low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating, which comprises the following steps: spraying a bonding layer on the surface of a substrate, and then spraying a reflective thermal insulation layer on the surface of the bonding layer to obtain a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating.

[0012] Preferably, before spraying, the substrate to be sprayed is soaked in an organic solvent, dried, and the surface of the substrate is roughened.

[0013] Further preferably, the roughness Ra value of the surface of the substrate is 10μm to 30μm by roughening the surface of the substrate.

[0014] Preferably, the substrate is a metal substrate.

[0015] Preferably, the adhesive layer is prepared by using a supersonic flame spraying technique or a laser cladding technique.

[0016] Preferably, the reflective heat insulation layer is prepared by using an atmospheric plasma spraying technique or a supersonic flame spraying technique under the condition that the surface temperature of the substrate is lower than 200 DEG C.

[0017] In a third aspect, the application discloses an application of the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating in the preparation of a laser weapon protection coating material.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating is a composite coating formed by an adhesive layer and a reflective heat insulation layer, wherein 1) the adhesive layer is formed by spraying one of Ni-Al self-adhesive powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY, which can improve the bonding strength of the coating and the substrate, reduce the thermal stress of the reflective heat insulation layer and the substrate when the temperature of the substrate is rapidly raised and lowered, and inhibit the crack propagation of the reflective heat insulation layer; and 2) the composition of the traditional heat insulation type laser protection coating material 8YSZ is optimized, Y2O3, Gd2O3, Yb2O3, TiO2 and Ta2O5 are introduced to form a five-rare earth main element double-silicate surface layer of the reflective heat insulation layer. 3+ In the ZrO2 lattice, a filling solid solution is formed, and oxygen vacancies are generated; meanwhile, Y2O3 with a cubic structure is introduced, Y 3+ The ion radius of Y2O3 is close to that of Zr 4+ , so that Y2O3 can replace Zr 4+ and form oxygen vacancies, the oxygen vacancies can reduce the repulsion between local oxygens, and make the coordination layer have a larger distortion, thereby keeping the cubic and tetragonal phases at room temperature; Yb2O3 can introduce oxygen vacancies, and the oxygen vacancies can cause structural distortion, so that the material can also be stably kept in the cubic phase structure at room temperature; meanwhile, a small amount of Ta 5+ with a valence of +5 is introduced, which can relieve the lattice distortion caused by the introduction of +3 valence ions, so that the material can also keep the cubic phase at room temperature; TiO2 with a high reflectivity is introduced, which can improve the reflectivity of the coating.

[0020] The preparation method of the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating provided by the application sprays the reflective thermal insulation layer under the condition that the surface temperature of the base material is lower than 200 DEG C, and the low base material temperature can ensure that the sprayed coating has high porosity and better thermal insulation performance. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A cross-sectional structure diagram of the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating with a base material.

[0022] Figure 2 A ZrO2 model reflectivity graph with different rare earth doping amounts.

[0023] Among them, 1-metal base material; 2-bonding layer; 3-reflective thermal insulation layer. DETAILED DESCRIPTION

[0024] To enable those skilled in the art to understand the characteristics and effects of the present application, the following only describes and defines the terms and phrases mentioned in the specification and claims. Unless otherwise specified, all technical and scientific words used herein are the usual meanings understood by those skilled in the art for the present application, and in the event of conflict, the definition in the specification shall prevail.

[0025] Theories or mechanisms described and disclosed herein, whether correct or not, should not limit the scope of the present application in any way, i.e., the present application can be implemented without being limited by any particular theory or mechanism.

[0026] Herein, all features defined in the form of numerical ranges or percentage ranges, such as numerical values, quantities, contents and concentrations, are only for the sake of brevity and convenience. Therefore, the description of numerical ranges or percentage ranges should be considered to have encompassed and specifically disclosed all possible sub-ranges and individual numerical values within the range (including integers and fractions).

[0027] Herein, unless otherwise specified, "comprising", "including", "containing", "having" or similar words encompass the meaning of "consisting of" and "consisting essentially of", for example, "A comprising a" encompasses the meaning of "A comprising a and other" and "A comprising only a".

[0028] Herein, for the sake of brevity, all possible combinations of the technical features in each embodiment or example are not described. Therefore, as long as the combinations of the technical features do not conflict, the technical features in each embodiment or example can be combined arbitrarily, and all possible combinations should be considered as the scope disclosed in the specification.

[0029] The application provides a preparation method of a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating.

[0030] 1. Pretreating the substrate

[0031] The metal substrate to be sprayed is soaked in an organic solvent to remove oil stains and impurities on the surface of the metal substrate. Then the surface is dried in an oven, and the surface of the metal substrate is treated by sand blasting to remove attachments and increase the adhesion between the coating and the substrate, so that the roughness Ra value of the surface of the treated metal substrate is 10-30 μm.

[0032] The sand blasting treatment is performed by using 24-50 mesh brown corundum sand at a sand blasting pressure of 0.4-0.6 MPa.

[0033] 2. Spraying the adhesive layer on the surface of the substrate

[0034] The surface of the pretreated metal substrate is sprayed with adhesive powder having a particle size of 10-40 μm by using supersonic flame spraying technology or laser cladding technology, the spraying distance is 320-400 mm, the kerosene flow rate is 4.5-5.5 GPH, the oxygen flow rate is 1300-1600 GPH, the powder feeder gas is 9-13 SLM, the spraying speed is 800-1000 mm / s, and the spraying thickness is 50-300 μm, so as to form an adhesive layer on the surface of the substrate.

[0035] The adhesive powder is one of Ni-Al self-bonding powder, Ni-Mo-Al powder, NiCrAlY powder, CoCrAlY powder and NiCoCrAlY powder.

[0036] 3. Spraying the reflective heat-insulating layer on the surface of the adhesive layer

[0037] 1) Y2O3 and Yb2O3 having a molar ratio of (3-2):(2-1), Gd2O3, TiO2 and Ta2O5 having an equimolar ratio, the total molar content of Gd2O3, TiO2 and Ta2O5 being 5-10%, the total molar content of Y2O3 and Yb2O3 being 20-35%, and the balance being ZrO2 are weighed to obtain a mixture. The mixture is mixed with ethanol according to 1 g:1 mL to obtain a powder. Ball milling is performed according to a ball-to-powder mass ratio of 5:1, and then drying, sintering in an argon atmosphere at 1600℃, and spray granulation are performed to obtain a five-element co-doped ZrO2 ceramic material having a particle size of 30-60 μm.

[0038] 2) using atmospheric plasma spraying technology or supersonic flame spraying technology to spray the five-doped ZrO2 ceramic material with particle size of 30-60 μm obtained in step 1) on the surface of the adhesive layer formed in step 2) under the condition that the substrate surface temperature is lower than 200 ℃, the spraying power is 35-42 kw, the spraying current is 560-580 A, the spraying distance is 80-100 mm, the gun moving speed is 600-1000 mm / s, and the spraying thickness is 100-450 μm, to deposit and form a reflective heat insulation layer on the surface of the adhesive layer, thereby obtaining the five-doped ceramic laser protection coating with low thermal conductivity and high reflectivity.

[0039] The application provides the five-doped ceramic laser protection coating with low thermal conductivity and high reflectivity prepared by the above method, which comprises an inner adhesive layer and an outer reflective heat insulation layer arranged in layers, as shown in the figure. Figure 1 The adhesive layer is arranged on the surface of a substrate, and the reflective heat insulation layer is arranged on the surface of the adhesive layer.

[0040] The reflective heat insulation layer is a five-doped ZrO2 ceramic coating, the base element selected is ZrO2, and the doping elements are Y2O3, Gd2O3, Yb2O3, TiO2 and Ta2O5. The material after doping has a single cubic phase structure at 25 ℃-1600 ℃. The molar content of ZrO2 is 60%-70%, the sum of the molar contents of Y2O3 and Yb2O3 is 20%-35%, the molar content ratio of Y2O3 to Yb2O3 is (3-2):(2-1), the sum of the molar contents of Gd2O3, TiO2 and Ta2O5 is 5%-10%, and the molar ratio of the three is equal.

[0041] The application will be further described in conjunction with specific examples. It should be understood that the examples are only used to illustrate the application but not to limit the scope of the application. Furthermore, it should be understood that those skilled in the art can make various modifications or amendments to the application after reading the content of the application, and these equivalent forms also fall within the scope defined by the appended claims of the application.

[0042] The following examples use the conventional instruments and equipment in the art. The experimental methods not specified in the following examples are usually carried out according to the conventional conditions or the conditions recommended by the manufacturers. The various raw materials used in the following examples are commercially available products, unless otherwise specified, and the specifications are conventional specifications in the art. In the specification of the application and the following examples, unless otherwise specified, “%” means atomic percentage, and the ratio means atomic ratio.

[0043] In the early stage of the experiment, based on the traditional heat insulation type laser protection coating material 8YSZ (composed of ZrO2 and Y2O3), Y2O3, Gd2O3, Yb2O3, TiO2 and Ta2O5 were added for material optimization, and different rare earth doping amount reflective heat insulation coating models as shown in Table 1 were prepared, and the reflectivity of 600nm-2000nm was detected by using ultraviolet-visible-near infrared spectrophotometer.

[0044] Table 1 reflectivity of ZrO2 model with different rare earth doping amount

[0045]

[0046]

[0047] The experimental results are shown in Table 2. Figure 2 As shown in Table 2, the average reflectivity of the reflective heat insulation coating model with different rare earth doping amount is more than 75% in the wavelength range of 500nm-2000nm, indicating that doping different rare earth can effectively improve the reflectivity of the coating.

[0048] On the basis of the reflective heat insulation coating, the adhesive layer is added to form the protective coating for further experiment.

[0049] Example 1

[0050] The embodiment of the present application provides a low thermal conductivity and high reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof, and the process flow is as follows:

[0051] Step one, the surface of the aviation 7075 aluminum alloy substrate to be prepared is pretreated, including oil removal and roughening treatment, the oil removal is soaked with organic solvent, then the surface is dried in an oven, and the workpiece surface is treated by sand blasting, 50 mesh size brown corundum sand is selected, the sand blasting pressure is 0.4MPa, so as to remove the adherent and increase the adhesion between the coating and the substrate, so that the roughness after treatment is about Ra 10;

[0052] Step two, the Ni-Al self-bonding powder with a particle size of 10-40μm is selected, and the supersonic flame spraying technology is used to spray a layer of adhesive layer on the surface of the substrate, the spraying distance is 320mm, the kerosene flow is 4.5GPH, the oxygen flow is 1300GPH, the powder feeder gas is 9SLM, the spraying speed is 800mm / s, and the spraying thickness is 50μm;

[0053] Step three, 15% of Y2O3, 3.3% of Gd2O3, 10% of Yb2O3, 3.3% of TiO2 and 3.3% of Ta2O5 are weighed in terms of molar content, and the balance is ZrO2 to obtain a mixture. The mixture is mixed with ethanol at a ratio of 1g:1mL to obtain a powder. The powder is ball milled at a ball-to-powder mass ratio of 5:1 for 24h at 300rpm, and then dried at 100℃ for 12h. The dried and ball milled powder is sintered at 1600℃ for 10h in an argon atmosphere, and then spray granulated to obtain a ZrO2(0.15Y2O3-0.033Gd2O3-0.1Yb2O3-0.033TiO2-0.033Ta2O5) powder with a particle size of 30-60μm.

[0054] Step four, the ZrO2(0.12Y2O3-0.017Gd2O3-0.08Yb2O3-0.017TiO2-0.017Ta2O5) powder with a particle size of 30-60μm prepared in step three is used as a raw material to deposit a reflective heat insulation layer on the surface of the adhesive layer by atmospheric plasma spraying technology; the parameters are as follows: spraying power 35kw, spraying current 560A, spraying distance 80mm, gun moving speed 600mm / s, and spraying thickness 100μm, to obtain a low thermal conductivity and high reflectivity five-element co-doped ceramic laser protection coating.

[0055] The laser thermal conductivity instrument is used to measure that the thermal conductivity of the coating is 0.8W / (m·K), and the ultraviolet-visible-near infrared spectrophotometer is used to measure the reflectivity of the coating at 600nm-2000nm, and the result is 78% on average.

[0056] Example 2

[0057] The embodiment of the present application provides a low thermal conductivity and high reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof, and the process flow is as follows:

[0058] Step one, the surface of an aviation 7075 aluminum alloy substrate to be prepared into a coating is pretreated, including oil removal and roughening treatment; the oil removal is soaked by using an organic solvent, then the surface is dried in an oven, and then the workpiece surface is treated by using sand blasting, 46-mesh size brown corundum sand is selected, and the sand blasting pressure is 0.45MPa, so that the adherents are removed and the adhesion between the coating and the substrate is increased, and the roughness of the treated surface is about Ra 15;

[0059] Step two, a Ni-Mo-Al powder with a particle size of 10-40μm is selected, and a bonding layer is sprayed on the surface of the substrate by using high-velocity oxygen fuel spraying technology; the spraying distance is 340mm, the kerosene flow is 4.8GPH, the oxygen flow is 1400GPH, the powder feeder gas is 10SLM, the spraying speed is 850mm / s, and the spraying thickness is 100μm.

[0060] Step three, using ZrO2(0.12Y2O3-0.033Gd2O3-0.081Yb2O3-0.033TiO2-0.033Ta2O5) as raw material (preparation method same as example 1, the difference is that the molar content of each component is different), particle size 30-60 μm, using atmospheric plasma spraying technology to deposit a layer of reflective thermal barrier layer on the surface of the adhesive layer; the parameters are as follows: spraying power 37kw, spraying current 570A, spraying distance 85mm, gun speed 700mm / s, the coating thickness is 200 μm.

[0061] Using laser thermal conductivity instrument, the thermal conductivity of the coating is 0.75 W / (m·K), and the reflectivity of the coating is measured by using ultraviolet-visible-near infrared spectrophotometer at 600nm-2000nm, and the result is 76%.

[0062] Example 3

[0063] The embodiment of the application provides a kind of low thermal conductivity high reflectivity five doped ceramic laser protection coating and preparation method thereof, and process flow is as follows:

[0064] Step one, the surface of the aviation 7075 aluminum alloy substrate to be prepared coating is pretreated, including oil removal and roughening treatment, oil removal is soaked with organic solvent, then the surface is dried in oven, and the workpiece surface is treated by sand blasting, 38 mesh size brown corundum sand is selected, sand blasting pressure is 0.5MPa, to remove adherend and increase the adhesion between coating and substrate, so that the roughness of the treated is about Ra 20;

[0065] Step two, using supersonic speed flame spraying to spray a layer of adhesive layer on the surface of substrate by selecting NiCrAIY powder, particle size 10-40 μm, spraying distance 360mm, kerosene flow 5.0GPH, oxygen flow 1450GPH, powder feeder gas 11SLM, spraying speed 900mm / s, spraying thickness 150 μm;

[0066] Step three, using ZrO2(0.18Y2O3-0.03Gd2O3-0.12Yb2O3-0.03TiO2-0.03Ta2O5) as raw material (preparation method same as example 1, the difference is that the molar content of each component is different), particle size 30-60 μm, using atmospheric plasma spraying technology to deposit a layer of reflective thermal barrier layer on the surface of the adhesive layer; the parameters are as follows: spraying power 39kw, spraying current 570A, spraying distance 90mm, gun speed 800mm / s, the coating thickness is 300 μm.

[0067] The laser thermal conductivity instrument is used to measure that the heat conductivity of the coating is 0.7 W / (m*K), and the ultraviolet-visible-near infrared spectrophotometer is used to measure the reflectivity of the coating at 600nm-2000nm, and the average result is 80%.

[0068] Example 4

[0069] The embodiment of the application provides a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof, and a process flow is as follows:

[0070] Step one, the surface of the aviation 7075 aluminum alloy substrate to be prepared is pretreated, including oil removal and roughening treatment, the oil removal is selected to be organic solvent soaking, then the surface is dried in an oven, the workpiece surface is treated by using sand blasting, 30-mesh size brown corundum sand is selected, the sand blasting pressure is 0.55MPa, so that the adherend is removed and the adhesion between the coating and the substrate is increased, and the roughness of the treated surface is about Ra 25;

[0071] Step two, CoCrAIY powder with a particle size of 10-40um is selected, and a bonding layer is sprayed on the surface of the substrate by using supersonic speed flame spraying, the spraying distance is 380mm, the kerosene flow is 5.2GPH, the oxygen flow is 1500GPH, the powder feeder gas is 12SLM, the spraying speed is 950mm / s, and the spraying thickness is 200um.

[0072] Step three, ZrO2(0.2Y2O3-0.03Gd2O3-0.1Yb2O3-0.03TiO2-0.03Ta2O5) is used as raw material (the preparation method is the same as that in the embodiment 1, and the difference lies in that the molar content of each component is different), the particle size is 30-60um, and a reflective heat insulation layer is deposited on the surface of the bonding layer by using atmospheric plasma spraying technology; parameters are as follows: the spraying power is 40kw, the spraying current is 575A, the spraying distance is 95mm, the gun moving speed is 900mm / s, and the coating thickness is 400um.

[0073] The laser thermal conductivity instrument is used to measure that the heat conductivity of the coating is 0.65 W / (m*K), and the ultraviolet-visible-near infrared spectrophotometer is used to measure the reflectivity of the coating at 600nm-2000nm, and the average result is 76%.

[0074] Example 5

[0075] The embodiment of the application provides a low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating and a preparation method thereof, and a process flow is as follows:

[0076] Step one, the surface of the aviation 7075 aluminum alloy substrate to be prepared for coating is pretreated, including oil removal and roughening treatment, oil removal selects organic solvent soaking, then the surface is dried in an oven, then the workpiece surface is treated by sand blasting, 24 mesh size brown corundum sand is selected, the sand blasting pressure is 0.6 MPa, so as to remove the adherent and increase the adhesion between the coating and the substrate, so that the roughness of the treated surface is about Ra 30;

[0077] Step two, the NiCoCrAIY powder with a particle size of 10-40 μm is selected, and a bonding layer is sprayed on the surface of the substrate by using supersonic flame spraying, the spraying distance is 400 mm, the kerosene flow is 5.5 GPH, the oxygen flow is 1600 GPH, the powder feeder gas is 13 SLM, the spraying speed is 1000 mm / s, and the spraying thickness is 300 μm.

[0078] Step three, ZrO2(0.2Y2O3-0.017Gd2O3-0.149Yb2O3-0.017TiO2-0.017Ta2O5) is used as raw material (the preparation method is the same as that in embodiment 1, and the difference lies in that the molar content of each component is different), the particle size is 30-60 μm, and a reflective heat insulation layer is deposited on the surface of the bonding layer by using atmospheric plasma spraying technology; the parameters are as follows: the spraying power is 42 kw, the spraying current is 580 A, the spraying distance is 100 mm, the gun moving speed is 1000 mm / s, and the coating thickness is 450 μm.

[0079] The laser thermal conductivity instrument is used to measure that the heat conductivity of the coating is 0.60 W / (m·K), and the ultraviolet-visible-near infrared spectrophotometer is used to measure the reflectivity of the coating at 600 nm-2000 nm, and the average is 75%.

[0080] In summary, by doping five different contents of rare earth elements in the traditional heat insulation type laser protection coating material 8YSZ, the prepared reflective heat insulation coating has excellent reflectivity. By spraying the bonding layer between the reflective heat insulation coating and the substrate, the bonding strength of the coating and the substrate can be improved, the thermal stress of the reflective heat insulation layer and the substrate when the temperature rises and falls rapidly can be reduced, and the reflectivity of the reflective heat insulation layer is not affected. Therefore, the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating prepared by the above method has high reflectivity and low thermal conductivity, and excellent protection ability.

[0081] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. A low thermal conductivity, high reflectivity, five-element co-doped ceramic laser protection coating, characterized in that, The low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating comprises a bonding layer and a reflective thermal insulation layer arranged in layers, the bonding layer is arranged on the surface of a substrate, and the reflective thermal insulation layer is arranged on the surface of the bonding layer; The bonding layer is formed by Ni Al self-bonding powder, Ni Mo One of Al, NiCrAlY, CoCrAlY and NiCoCrAlY is sprayed to form; the reflective thermal insulation layer is formed by spraying a composite material with ZrO2 as a base element and Y2O3, Gd2O3, Yb2O3, TiO2 and Ta2O5 as doping elements; in the reflective thermal insulation layer, the molar content of ZrO2 is 60% to 70%, the sum of the molar contents of Y2O3 and Yb2O3 is 20% to 35%, the molar ratio of Y2O3 to Yb2O3 is (3-2):(2-1), the sum of the molar contents of Gd2O3, TiO2 and Ta2O5 is 5% to 10%, and the molar ratio of the three is equal; the reflective thermal insulation layer has a cubic phase structure at 25°C to 1600°C.

2. The low thermal conductivity high reflectivity five-element co-doped ceramic laser protection coating according to claim 1, characterized in that, The thickness of the bonding layer is 50-300 μm, and the thickness of the reflective thermal insulation layer is 100-450 μm.

3. The method of producing a low thermal conductivity, high reflectivity, five- element co-doped ceramic laser protection coating according to claim 1 or 2, characterized in that, The bonding layer is sprayed on the surface of the substrate, and then the reflective thermal insulation layer is sprayed on the surface of the bonding layer, thereby obtaining the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating.

4. The method for preparing a low thermal conductivity, high reflectivity pentagonal co-doped ceramic laser protective coating according to claim 3, characterized in that, Before spraying, the substrate to be sprayed is soaked in an organic solvent, dried, and the surface of the substrate is roughened.

5. The method of producing a low thermal conductivity, high reflectivity, five- element co-doped ceramic laser protection coating according to claim 4, characterized in that, The roughness Ra of the surface of the substrate is 10-30 μm by roughening the surface of the substrate.

6. The method for preparing a low thermal conductivity, high reflectivity pentagonal co-doped ceramic laser protective coating according to claim 3, characterized in that, The bonding layer is prepared by using a supersonic flame spraying technology or a laser cladding technology.

7. The method of claim 3, wherein the method further comprises the step of: The reflective thermal insulation layer is prepared by using an atmospheric plasma spraying technology or a supersonic flame spraying technology under the condition that the temperature of the surface of the substrate is lower than 200 ℃. ​ 8. The use of the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating according to claim 1 or 2 or the low-thermal-conductivity high-reflectivity five-element co-doped ceramic laser protection coating prepared by the method according to any one of claims 3-7 in preparing a laser weapon protection coating material.

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