CN109851377B - Laser-induced high-temperature solid-phase reaction for generating A2B2O7Method for forming thermal barrier coating material - Google Patents
Laser-induced high-temperature solid-phase reaction for generating A2B2O7Method for forming thermal barrier coating material Download PDFInfo
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Abstract
The invention relates to the technical field of thermal barrier coating materials, in particular to a method for generating A by laser-induced high-temperature solid-phase reaction2B2O7A method of forming a thermal barrier coating material comprising the steps of: (I) and taking the oxide AOxAnd oxide BOyMixing uniformly to obtain mixed powder; (II) uniformly distributing the mixed powder in the step (I) on the surface of a substrate; (III) irradiating laser on the surface of the substrate in the step (II), and inducing the mixed powder to generate high-temperature solid-phase reaction under the action of the laser to obtain A2B2O7And growing on the surface of the substrate to form A2B2O7Thermal barrier coating material of type; wherein, the element A is a rare earth element, and the element B is at least one of Ti, Zr and Hf; x is more than or equal to 0.5 and less than or equal to 2, and y is 2. The preparation method has the advantages of simple operation, convenient control, high production efficiency, low production cost, little pollution and short production period, and can be used for large-scale production.
Description
Technical Field
The invention relates to the technical field of thermal barrier coating materials, in particular to a method for generating A by laser-induced high-temperature solid-phase reaction2B2O7A method of forming a thermal barrier coating material.
Background
The thermal barrier coating can effectively protect key hot end components such as aero-engine blades and the like, and is widely applied to the field of aero-engines. The thermal barrier coating material is required to have the characteristics of high melting point, low thermal conductivity, relatively high thermal expansion coefficient, high-temperature phase stability, low sintering shrinkage and the like. The ceramic material for the active thermal barrier coating is yttria partially stabilized zirconia (Y)2O3stabilized particulate zirconia, abbreviated as YSZ), it is difficult to meet the requirement of further development of thermal barrier coatings due to its own phase change and serious high-temperature sintering, and it is necessary to find a new material for thermal barrier coatings to replace YSZ. Among the reported materials for thermal barrier coatings, A2B2O7Ceramic materials are an important kind of thermal barrier coating materials. A having pyrochlore structure2B2O7The ceramic material has the advantages of low thermal conductivity, high service temperature, good high-temperature chemical stability and the like, so that the ceramic material becomes a novel candidate material for the thermal barrier coating ceramic layer.
Preparation A at the present stage2B2O7The method of forming thermal barrier coating materials often requires multiple steps. Firstly, synthesizing A by a solid phase method, a sol method or a hydrothermal method2B2O7And (3) a ceramic material. Then, the synthesized A2B2O7The molding ceramic material is processed into A with uniform and small particle size2B2O7And (3) powder. Finally, A is coated by a coating process2B2O7Powder coating on the substrate to obtain A2B2O7Thermal barrier coating material. The preparation method is not only complicated in steps, but also in the synthesis of A2B2O7The following problems are also encountered with the type ceramic material. Solid phase Synthesis of A2B2O7The ceramic material has high reaction temperature, long high-temperature reaction time and great requirement on equipment energy consumption; the sol method has complex process, high raw material requirement and can generate organic pollution; the hydrothermal method has high equipment requirement, great technical difficulty, low safety performance and the like. Due to the above-mentioned problems, it is necessary to provide a solution,A2B2O7the preparation of the thermal barrier coating material is greatly limited and still cannot be solved in the prior art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for generating A by laser-induced high-temperature solid-phase reaction2B2O7The preparation method of the thermal barrier coating material has the advantages of simple operation, convenient control, high production efficiency, low production cost, little pollution and short production period, and can be used for large-scale production2B2O7The thermal barrier coating material has the advantages of low thermal conductivity, high use temperature, good high-temperature chemical stability, close combination with a substrate and the like.
The purpose of the invention is realized by the following technical scheme: laser-induced high-temperature solid-phase reaction for generating A2B2O7A method of forming a thermal barrier coating material comprising the steps of:
(I) and taking the oxide AOxAnd oxide BOyMixing uniformly to obtain mixed powder;
(II) uniformly distributing the mixed powder in the step (I) on the surface of a substrate;
(III) irradiating laser on the surface of the substrate in the step (II), and inducing the mixed powder to generate high-temperature solid-phase reaction under the action of the laser to obtain A2B2O7And A is2B2O7Growing on the surface of the substrate to form A2B2O7Thermal barrier coating material of type;
wherein, the element A is a rare earth element, and the element B is at least one of Ti, Zr and Hf; x is more than or equal to 0.5 and less than or equal to 2, and y is 2.
The invention generates A by laser-induced high-temperature solid-phase reaction2B2O7The method of the thermal barrier coating material is to take laser as an energy source and induce a raw material oxide AO under the action of the laserxAnd raw material oxide BOyHigh-temperature solid-phase reaction occurs and grows on the substrate to obtain A2B2O7Thermal barrier coating material. Further, the oxide AO is excited by the action of laser lightxAnd oxide BOyAbsorbing photon energy to generate local high temperature, rapidly improving the reactivity of the two raw materials and inducing high-temperature solid-phase reaction to obtain nucleated A2B2O7Performing chain growth on the surface of the substrate by taking the nucleus as the center to obtain A2B2O7A thermal barrier material; generated A2B2O7The thermal barrier material has good heat-insulating property, leads the local high temperature of the reaction area to the surface of the substrate, melts the surface of the substrate due to the local high temperature, A2B2O7The thermal barrier material is tightly combined with the substrate and cladded on the surface of the substrate to obtain A2B2O7Thermal barrier coating material. With the existing Synthesis A2B2O7Compared with the method for preparing the ceramic material, the preparation method directly generates A on the substrate from the raw material2B2O7The thermal barrier coating material has simple process steps, and avoids the existing solid phase method for synthesizing A2B2O7The ceramic material has high reaction temperature and long reaction time, so that the energy consumption is overlarge, the organic matter emission pollution caused by high raw material requirement and organic matter used in the preparation process of the existing sol method is avoided, and the high equipment requirement, the large technical difficulty and the low safety performance of the existing hydrothermal method are also avoided. The substrate of the invention comprises but is not limited to copper sheet metal and high-strength steel, and is applied to high-temperature heat insulation equipment such as airplanes, power generation equipment, furnace linings, heat exchangers, reactors and the like.
The method has the advantages of simple operation, convenient control, high production efficiency, low production cost, little pollution, short production period, loose requirement of the preparation process on the environment, high utilization rate of raw materials, no by-product and suitability for large-scale production; a obtained by the method2B2O7The thermal barrier coating material has the advantages of low thermal conductivity, high use temperature, good high-temperature chemical stability, close combination with a substrate and the like, and has uniform and direct film formationGood high-temperature stability of the coating, and the like. Wherein, in step (I), the oxide AO is reactedxAnd oxide BOyUniformly mixed and beneficial to oxide AOxAnd oxide BOyThe materials are closely contacted and quickly react under the action of laser, so that the reaction rate and the utilization rate of raw materials are improved; in the step (II), the mixed powder is uniformly distributed, which is beneficial to the preparation of A2B2O7The thermal barrier coating material is uniformly formed on the surface of the substrate to improve A2B2O7The thickness of the thermal barrier coating material distributed on the surface of the substrate is balanced, so that the high temperature resistance and the heat insulation performance of the whole body are improved; rare earth metal oxide AOxWith oxide BOyAfter combination, the rare earth metal oxide has a lower thermal diffusion coefficient and a higher thermal expansion coefficient, and can improve the thermal phase stability of the thermal barrier coating, so that the thermal shock resistance is improved, the thermal conductivity is reduced, the thermal expansion performance is improved, and the application of the rare earth metal oxide in the thermal barrier coating is broken. The element B is at least one of Ti, Zr and Hf, i.e. the oxide BOyIs TiO2、ZrO2And HfO2At least one of (1).
Preferably, the element A is at least one of Sc, Y, La, Nd, Eu, Gd, Dy, Er, Yb and Lu.
The rare earth element A adopts at least one of Sc, Y, La, Nd, Eu, Gd, Dy, Er, Yb and Lu, namely oxide AOxIs Sc2O3、Y2O3、La2O3、Nd2O3、Eu2O3、Gd2O3、Dy2O3、Er2O3、Yb2O3And Lu2O3At least one of the rare earth oxides has a low thermal diffusion coefficient and a high thermal expansion coefficient, absorbs photon energy under laser irradiation, generates local high temperature and reacts with oxide BOyA high temperature solid phase reaction occurs. Preferably, the oxide AOxFrom Sc2O3、Y2O3、La2O3、Nd2O3、Eu2O3、Gd2O3、Dy2O3、Er2O3、Yb2O3And Lu2O3Of the oxide BOyFrom TiO2、ZrO2And HfO2At least two of the components (A) are irradiated by the laser in the step (III) to generate a multi-component A2B2O7The thermal barrier coating material has more excellent performance.
Preferably, in said step (I), the oxide AOxAnd oxide BOyAccording to the molar ratio of the A element to the B element of 0.8-1.2: 1 and mixing.
That is, the mixed powder contains n (A) and n (B) in the range of 0.8-1.2: 1, the invention improves the oxide AO by controlling the molar ratioxAnd oxide BOyUtilization ratio of (A) produced2B2O7The material of the thermal barrier coating has high purity and can prevent residual oxide AOxAnd oxide BOyThe interface bonding strength of the thermal barrier coating and the substrate is reduced, and the residual rare earth oxide AO is avoidedxReduced thermal phase stability of the coating or residual oxide BOyThe thermal barrier coating is easily damaged due to the large expansion coefficient.
Preferably, in the step (I), the mixing process is carried out at a ball-to-feed ratio of 4-6: 1-2, and ball milling for 1-3h under the conditions of 200 and 500 r/s.
Oxide AOxAnd oxide BOyAfter ball milling by the scheme, the oxide AO is obtainedxAnd oxide BOyHas a lower particle diameter, a finer mixed powder, an oxide AOxAnd oxide BOyThe contact between the oxide AO and the anode is tighter, and the oxide AO is improvedxAnd oxide BOyEfficiency of high temperature solid phase reaction and formation of A2B2O7Yield of thermal barrier coating material.
Preferably, in the step (III), the laser irradiation is performed by using at least one continuous laser beam having a near infrared wavelength.
The using quantity of the continuous laser and the value of the near infrared wavelength can be obtained according to the photon energy absorbed by the selected oxide after the laser excitationWhen the raw material adopts various rare earth oxides, a plurality of laser beams with different wavelengths can be simultaneously projected on the mixed powder to ensure that the oxide AOxThe whole is in an excited state, and the reactivity is improved. Wherein the value of the near infrared wavelength is 780-3000 nm.
Preferably, in the step (III), the optical power density of the laser irradiation is 200-2The irradiation time is 0.5-120 s.
The optical power density is controlled at 200-2The raw materials absorb more photon energy, the time for local high temperature to appear is shorter, the reaction time is greatly shortened, the reaction efficiency is improved, and in the range, the higher the power density is, the faster the reaction rate is, and the shorter the reaction time is. The defined optical power density is in negative correlation with the irradiation time, and the larger the optical power density is, the shorter the irradiation time is required; if the power density is too low, the efficiency of the raw materials for absorbing photon energy is lower, and the reaction rate is greatly reduced; if the power density is too high, the reaction rate is not changed, but the energy cannot be effectively utilized, so that the resource waste is caused; the relationship between the optical power density and the irradiation time according to the present invention is shown in FIG. 5.
Preferably, in the step (III), the laser irradiation is performed on the surface of the substrate in a laser scanning manner.
By adopting the technical scheme, the laser irradiation path can be controlled conveniently, so that the control A is controlled2B2O7The distribution of thermal barrier coating material on the surface of the substrate. By means of laser scanning, large-area uniform and flat A is obtained2B2O7Thermal barrier coating material.
Preferably, in the step (II), the mixed powder of the step (I) is uniformly distributed on the surface of the substrate by means of spraying or electron beam physical vapor deposition.
By adopting the technical scheme, the mixed powder is more uniformly distributed, and the method is particularly suitable for matrixes with irregular surfaces. More preferably, the mixed powder of step (I) is uniformly distributed on the surface of the substrate by spraying.
Preferably, the oxide AOxPurity and oxide BO ofyThe purity of the product is more than or equal to 99 percent.
By adopting the technical scheme, the influence A caused by impurities is avoided2B2O7The generation and yield of the thermal barrier coating material are improved, and the residual impurity pair A is avoided2B2O7The thermal phase stability, expansion coefficient, thermal conductivity, etc. of the thermal barrier coating material have adverse effects.
Preferably, step (II) and step (III) are operated sequentially or simultaneously.
More preferably, step (II) and step (III) are operated synchronously to improve preparation A2B2O7Efficiency of thermal barrier coating material.
The invention has the beneficial effects that: laser-induced high-temperature solid-phase reaction to generate A2B2O7The preparation method of the thermal barrier coating material has the advantages of simple operation, convenient control, high production efficiency, low production cost, little pollution and short production period, and can be used for large-scale production2B2O7The thermal barrier coating material has the advantages of low thermal conductivity, high use temperature, good high-temperature chemical stability, close combination with a substrate and the like.
Drawings
FIG. 1 is preparation A of the present invention2B2O7A flow diagram of a thermal barrier coating material;
FIG. 2 is preparation A of the present invention2B2O7Schematic step diagram of thermal barrier coating material;
FIG. 3 shows the present invention A2B2O7Schematic diagram of growth of type thermal barrier coating material on a substrate;
FIG. 4 shows Yb prepared in example 1 of the present invention2Zr2O7XRD contrast pattern of type thermal barrier coating material and JCPDS standard;
FIG. 5 shows the present invention A2B2O7Optical power density versus exposure time for a thermal barrier coating material of the type;
FIG. 6 shows Yb produced in example 1 of the present invention2Zr2O7SEM topography of type thermal barrier coating material;
FIG. 7 shows Yb produced in example 1 of the present invention2Zr2O7The thermal conductivity of the thermal barrier coating material is plotted against the temperature.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Example 1
As shown in FIGS. 1-3, a laser-induced high temperature solid phase reaction produces Yb2Zr2O7A method of forming a thermal barrier coating material comprising the steps of:
(I) taking Yb with the purity of 99.9%2O3And ZrO of 99.9% purity2In a molar ratio of Yb2O3：ZrO2Is 1: 2, the ratio of the ball to the material is 5: 1. ball milling is carried out for 2 hours under the condition that the rotating speed is 300r/s, and mixed powder is obtained;
(II) uniformly distributing the mixed powder obtained in the step (I) on the surface of a substrate, wherein the substrate is a copper metal plate, the mixed powder is uniformly distributed and has a flat surface, and the thickness of the mixed powder is 0.5 mm;
(III) irradiating laser on the surface of the substrate in the step (II), and controlling the optical power density of the laser to be 500W/cm under the action of continuous laser with the wavelength of 980nm2Inducing the mixed powder to perform high-temperature solid-phase reaction to obtain Yb with the laser action time of 5s2Zr2O7And Yb2Zr2O7Growing on the surface of the substrate to form Yb2Zr2O7Thermal barrier coating material.
Example 2
As shown in FIGS. 1-3, a laser-induced high temperature solid phase reaction produces Yb2Zr2O7-Y2Zr2O7A method for forming a composite thermal barrier coating material, comprising the steps of:
(I) taking Yb with the purity of 99.9%2O3And Y having a purity of 99.9%2O3And ZrO of 99.9% purity2In a molar ratio of Yb2O3：Y2O3：ZrO2Is 0.5:0.5:2, and the ratio of ball to material is 5: 1. ball milling is carried out for 2 hours at the rotating speed of 300r/s, and mixed powder is obtained;
(II) uniformly distributing the mixed powder obtained in the step (I) on the surface of a substrate, wherein the substrate is a copper metal plate, the mixed powder is uniformly distributed and has a flat surface, and the thickness of the mixed powder is 0.5 mm;
(III) irradiating laser on the surface of the substrate in the step (II), and controlling the optical power density of the laser to be 500W/cm under the action of continuous laser with the wavelength of 980nm2Inducing the mixed powder to perform high-temperature solid-phase reaction to obtain Yb with the laser action time of 4s2Zr2O7And Y2Zr2O7And growing on the surface of the substrate to form Yb2Zr2O7-Y2Zr2O7The composite thermal barrier coating material.
Example 3
As shown in FIGS. 1-3, a laser-induced high temperature solid phase reaction for the formation of Gd2Zr2O7A method of forming a thermal barrier coating material comprising the steps of:
(I) and taking Gd with the purity of 99.9 percent2O3And ZrO of 99.9% purity2At a molar ratio of Gd2O3：ZrO2Is 1: 2, mixing the raw materials in a ball-to-feed ratio of 5: 1. ball milling is carried out for 2 hours at the rotating speed of 300r/s, and mixed powder is obtained;
(II) uniformly distributing the mixed powder obtained in the step (I) on the surface of a substrate, wherein the substrate is a copper metal plate, the mixed powder is uniformly distributed and has a flat surface, and the thickness of the mixed powder is 0.5 mm;
(III) irradiating laser on the surface of the substrate in the step (II), and controlling the optical power density of the laser to be 400W/cm under the action of continuous laser with the wavelength of 980nm2The laser scans the surface of the substrate in a bow shape at a scanning speed of 3mm/s, and induces the mixed powder to perform high-temperature solid-phase reaction to obtain Gd2Zr2O7And grows on the surface of the substrate to generate Gd2Zr2O7Thermal barrier coating material.
Example 4
As shown in FIGS. 1-3, a laser-induced high temperature solid phase reaction produces A2B2O7A method of forming a thermal barrier coating material comprising the steps of:
(I) and taking the oxide AOxAnd oxide BOyMixing uniformly to obtain mixed powder;
(II) uniformly distributing the mixed powder in the step (I) on the surface of a substrate;
(III) irradiating laser on the surface of the substrate in the step (II), and inducing the mixed powder to generate high-temperature solid-phase reaction under the action of the laser to obtain A2B2O7And growing on the surface of the substrate to form A2B2O7Thermal barrier coating material of type;
wherein, the element A is a rare earth element, and the element B is Ti; x is 1.5 and y is 2.
The substrate of the invention is a high-strength steel plate, and the substrate is applied to a reactor.
The element A is Sc.
In said step (I), the oxide AOxAnd oxide BOyIn a molar ratio of 1: 1.
in the step (I), the mixing process is carried out according to a ball-material ratio of 5: 1.5, and ball milling for 2 hours at the rotating speed of 350 r/s.
In the step (III), the laser irradiation is performed by using a continuous laser beam having a near-infrared wavelength. The near infrared wavelength is 980 nm.
In the step (III), the optical power density of the laser irradiation is 500W/cm2The irradiation time was 65 seconds.
In the step (III), the laser irradiation is performed on the surface of the substrate in a laser scanning manner.
In the step (II), the mixed powder in the step (I) is uniformly distributed on the surface of the matrix in a spraying mode.
Said oxide AOxPurity and oxide BO ofyThe purity of (A) was 99%.
The step (II) and the step (III) are synchronously operated.
Example 5
Laser-induced high-temperature solid-phase reaction for generating A2B2O7A method of forming a thermal barrier coating material comprising the steps of:
(I) and taking the oxide AOxAnd oxide BOyMixing uniformly to obtain mixed powder;
(II) uniformly distributing the mixed powder in the step (I) on the surface of a substrate;
(III) irradiating laser on the surface of the substrate in the step (II), and inducing the mixed powder to generate high-temperature solid-phase reaction under the action of the laser to obtain A2B2O7And growing on the surface of the substrate to form A2B2O7Thermal barrier coating material of type;
wherein said oxide AOxIs Nd2O3、Yb2O3And Lu2O3In a molar ratio of 1: 3: 1, said oxide BO being mixedyIs TiO2And ZrO2In a molar ratio of 1: 1.
The substrate of the invention is a copper sheet metal.
In said step (I), the oxide AOxAnd oxide BOyIn a molar ratio of 1: 1.
in the step (I), the mixing process is carried out according to a ball-material ratio of 4: 1. ball milling is carried out for 3 hours under the condition of 200 r/s.
In the step (III), the laser irradiation is performed by using two continuous lasers with near-infrared wavelengths. The wavelengths of the two beams of near infrared rays are 980nm and 1064nm respectively.
In the step (III), the optical power density of the laser irradiation is 200W/cm2The irradiation time was 120 s.
In the step (III), the laser irradiation is performed on the surface of the substrate in a laser scanning manner.
In the step (II), the mixed powder in the step (I) is uniformly distributed on the surface of the substrate in an electron beam physical vapor deposition mode.
Said oxide AOxPurity and oxide BO ofyThe purity of (A) was 99.8%.
The step (II) and the step (III) are operated in sequence.
Example 6
Laser-induced high-temperature solid-phase reaction for generating A2B2O7A method of forming a thermal barrier coating material comprising the steps of:
(I) and taking the oxide AOxAnd oxide BOyMixing uniformly to obtain mixed powder;
(II) uniformly distributing the mixed powder in the step (I) on the surface of a substrate;
(III) irradiating laser on the surface of the substrate in the step (II), and inducing the mixed powder to generate high-temperature solid-phase reaction under the action of the laser to obtain A2B2O7And growing on the surface of the substrate to form A2B2O7Thermal barrier coating material of type;
wherein said oxide AOxIs Gd2O3Said oxide BOyIs HfO2。
The substrate of the invention is a copper sheet metal.
In said step (I), the oxide AOxAnd oxide BOyAccording to the molar ratio of the A element to the B element as 1: 1 and mixing.
In the step (I), the mixing process is carried out according to a ball-material ratio of 6: 2. ball milling is carried out for 1h under the condition of 500 r/s.
In the step (III), the laser irradiation is performed by using a continuous laser beam having a near-infrared wavelength. The near infrared wavelength is 780 nm.
In the step (III), the optical power density of the laser irradiation is 1200W/cm2The irradiation time was 0.5 s.
In the step (III), the laser irradiation is performed on the surface of the substrate in a laser scanning manner.
In the step (II), the mixed powder in the step (I) is uniformly distributed on the surface of the substrate in an electron beam physical vapor deposition mode.
Said oxide AOxHas a purity of 99.9% and oxide BOyThe purity of (2) was 99.8%.
The step (II) and the step (III) are synchronously operated.
Example 7 Performance testing
(I) The invention A2B2O7Compositional analysis of thermal barrier coating materials
Yb from example 12Zr2O7The thermal barrier coating material is subjected to X-ray diffraction to obtain an XRD (X-ray diffraction) spectrum, and then Yb is obtained from the JCPDS standard2Zr2O7The PDF card of (1), namely PDF #78-1300, was formed into Yb prepared in example 1 as shown in FIG. 42Zr2O7XRD contrast pattern of type thermal barrier coating material with JCPDS standard.
As can be seen from FIG. 4, Yb produced in example 12Zr2O7Type A thermal barrier coating material was matched with PDF #78-1300 in JCPDS standard, and the A obtained in example 1 was proved2B2O7The thermal barrier coating material is Yb2Zr2O7The thermal barrier coating material has few impurities.
(II) invention A2B2O7Morphology analysis of thermal barrier coating material
Yb from example 12Zr2O7The thermal barrier coating material is imaged by SEM scanning to obtain an SEM topography of the thermal barrier coating material, as shown in FIG. 6.
As can be seen from FIG. 6, Yb produced in example 12Zr2O7Thermal barrier coating materials of the type having a porous structure.
(III) present invention A2B2O7Heat conduction performance test of thermal barrier coating material
Yb from example 12Zr2O7The thermal barrier coating material is tested to have a thermal conductivity varying with temperature in the temperature range of 20-1000 ℃, as shown in fig. 7.
As can be seen from FIG. 7, Yb produced in example 12Zr2O7The thermal barrier coating material has a thermal conductivity of 0.225-0.4W/(m.K) in the temperature range of 20-1000 ℃, and the thermal conductivity increases along with the increase of the temperature. Existing Yb2Zr2O7Thermal barrier coating material of type (Yb) prepared in example 1 and having a thermal conductivity of 1.2-1.6W/(m.K) in the temperature range of 20-1000 deg.C2Zr2O7The thermal conductivity coefficient of the thermal barrier coating material is lower; in the prior art, developments on new zirconate-based thermal barrier coating materials disclose the common zirconate series and their thermodynamic parameters, which mention Yb2Zr2O7A thermal conductivity of 1.58W/(m.K) at 1073K, and Yb of example 12Zr2O7The thermal conductivity coefficient is 0.36W/(m.K) at the temperature of 800 ℃; the above difference, based on the SEM topography of FIG. 6 showing a porous structure, Yb of example 12Zr2O7The reason for the smaller thermal conductivity of thermal barrier coating materials of the type is presumably due to the porous structure.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (8)
1. Laser-induced high-temperature solid-phase reaction for generating A2B2O7A method of forming a thermal barrier coating material, characterized by: the method comprises the following steps:
(I) and taking the oxide AOxAnd oxide BOyMixing uniformly to obtain mixed powder;
(II) uniformly distributing the mixed powder in the step (I) on the surface of a substrate;
(III) irradiating laser on the surface of the substrate in the step (II) and inducing the mixed powder to emit light under the action of the laserPerforming solid phase reaction at raw and high temperature to obtain A2B2O7And A is2B2O7Growing on the surface of the substrate to form A2B2O7Thermal barrier coating material of type;
wherein, the element A is a rare earth element, and the element B is at least one of Ti, Zr and Hf; x is more than or equal to 0.5 and less than or equal to 2, and y is 2;
in said step (I), the oxide AOxAnd oxide BOyAccording to the molar ratio of the A element to the B element of 0.8-1.2: 1, mixing;
in the step (III), the optical power density of the laser irradiation is 200-2The irradiation time is 0.5-120 s.
2. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: the element A is at least one of Sc, Y, La, Nd, Eu, Gd, Dy, Er, Yb and Lu.
3. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: in the step (I), the mixing process is carried out according to the ratio of balls to materials of 4-6: 1-2, and ball milling for 1-3h under the conditions of 200 and 500 r/s.
4. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: in the step (III), the laser irradiation is performed by using at least one continuous laser beam having a near-infrared wavelength.
5. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: in the step (III), the laser irradiation is performed on the surface of the substrate in a laser scanning manner.
6. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: in the step (II), the mixed powder in the step (I) is uniformly distributed on the surface of the matrix in a spraying or electron beam physical vapor deposition mode.
7. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: said oxide AOxPurity and oxide BO ofyThe purity of the product is more than or equal to 99 percent.
8. The laser-induced high-temperature solid-phase reaction of claim 1 to form A2B2O7A method of forming a thermal barrier coating material, characterized by: the step (II) and the step (III) are operated sequentially or synchronously.
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| CN110372384A (en) * | 2019-07-30 | 2019-10-25 | 华东师范大学重庆研究院 | A kind of preparation method of transparent stealth material |
| US11465911B2 (en) | 2019-07-30 | 2022-10-11 | Chongqing Institute Of East China Normal University | Method for preparing ceramic material |
| CN110256092A (en) * | 2019-07-30 | 2019-09-20 | 华东师范大学重庆研究院 | A kind of heat barrier coat material and preparation method thereof |
| CN114349502B (en) * | 2022-03-21 | 2022-06-03 | 中国人民解放军国防科技大学 | Titanium-doped lanthanum hafnate ceramic for low-thermal-expansion thermal/environmental barrier coating and preparation method thereof |
| CN116477940B (en) * | 2023-03-17 | 2024-04-12 | 电子科技大学 | Yttrium titanate doped zirconia ceramic material and preparation method and application thereof |
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