Thermal protection coating material with low thermal conductivity to control coefficient of thermal expansion and preparation method and application thereof

Abstract

The application discloses a thermal protection coating material with low thermal conductivity and controllable thermal expansion coefficient and a preparation method and application thereof. The thermal protection coating material is prepared from nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder as raw materials through mechanical ball milling, cold isostatic pressing and solid phase sintering, and has a chemical composition of xGd2O3-(1-x)Yb2O3-2xZrO2-(2-2x)SiO2, and 0x<1. The composite material has the characteristics of low thermal conductivity and controllable thermal expansion coefficient, has great potential in the fields of existing thermal barrier coating materials and environmental barrier coating materials, and even in the field of new thermal environmental barrier coating materials. The thermal protection coating material can improve the material performance of the thermal barrier coating and the environmental barrier coating, and based on the advantages of the thermal barrier and the environmental barrier coating, the thermal environmental barrier coating is formed to realize the application of the coating with higher performance.

Description

Technical Field

[0001] This invention relates to a thermal protective coating material, its preparation method, and its application, specifically to a thermal protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, its preparation method, and its application. Background Technology

[0002] With the rapid development of the aerospace industry, the thrust-to-weight ratio of turbine engines is increasing, leading to ever-higher operating temperatures for hot-end components in the combustion chamber. Traditional high-temperature alloy matrices and thermal barrier coatings (TBCs) are no longer sufficient to meet application requirements. Therefore, lightweight silicon-based ceramic composites have emerged. These materials can operate at higher temperatures and reduce structural weight by 30-50%, gradually replacing high-temperature alloys in many components. Environmental barrier coatings (EBCs) protect silicon-based ceramic composites from corrosion in the application environment, extending the service life of hot-end components.

[0003] A typical TBC material is yttrium-stabilized zirconia (YSZ), which has a thermal conductivity of 2.1–2.3 W·m. -1 ·K -1 The coefficient of thermal expansion is approximately 11.0 × 10⁻⁶. -6 K -1 However, at temperatures above 1200℃, the martensitic transformation of YSZ is unavoidable, leading to coating failure due to volume expansion. Zirconate materials, with their advantages of high temperature resistance and low thermal conductivity, are considered potential replacements for YSZ as next-generation TBC materials. Common zirconate materials include Gd₂Zr₂O₇, La₂Zr₂O₇, Sm₂Zr₂O₇, and Nd₂Zr₂O₇, with thermal conductivity ranging from 1.5 to 2.0 W·m⁻¹. -1 ·K -1 Its coefficient of thermal expansion is approximately 9.0–11.0 × 10⁻⁶. -6 K -1 The aforementioned TBC material is only applicable to high-temperature alloy substrates, and its coefficient of thermal expansion is not adjustable.

[0004] From the 1990s to the present, research on EBC materials can be roughly divided into three stages: the first generation of environmental barrier coating materials includes mullite (with an average coefficient of thermal expansion of 6.5–7.0 × 10⁻⁶). -6 K -1 Yttrium-stabilized zirconium oxide (YSZ) (thermal conductivity approximately 2.3 W·m) -1 ·K -1 The average coefficient of thermal expansion is 10×10 -6 K -1Barium strontium aluminum silicate (1-xBaO·xSrO·Al2O3·2SiO2, 0≤x≤1, abbreviated as BSAS) (average coefficient of thermal expansion is 4.0~8.0×10⁻⁶). - 6 K -1 The second-generation environmental barrier coating materials are mainly rare-earth silicate systems, including rare-earth monosilicate RE2SiO5 (thermal conductivity of 1.5–3.53 W·m). -1 ·K -1 The average coefficient of thermal expansion is 5.0–9.0 × 10⁻⁶. -6 K -1 ) and disilicate RE2Si2O7 (thermal conductivity 1.5–3.53 W·m) -1 ·K -1 The average coefficient of thermal expansion is 3.5–5.5 × 10⁻⁶. -6 K -1 Among the rare earth elements with application potential are scandium (Sc), yttrium (Y), erbium (Er), ytterbium (Yb), and lutetium (Lu). Third-generation environmental barrier coating materials are modifications of second-generation materials, primarily through methods such as high entropy or doping to further enhance their performance. The aforementioned EBC materials are only applicable to lightweight silicon-based ceramic composite substrates, and their coefficient of thermal expansion is not controllable.

[0005] Currently, researchers are beginning to employ a multilayer thermal environment barrier (T / EBC) coating structure, which involves covering the EBC surface with a layer of TBC, to meet the performance and structural requirements of the coating. While multilayer coating systems offer certain performance advantages, their service life is affected by factors such as relatively high thermal conductivity, mismatch in the coefficients of thermal expansion (CTE) between coating materials, and the introduction of more interfaces.

[0006] To address the issue that TBC and EBC materials are applied to different substrates and their coefficients of thermal expansion are not adjustable, there is an urgent need to develop a type of thermally protective coating material with an adjustable coefficient of thermal expansion. This material should ensure low thermal conductivity and, by adjusting the coefficient of thermal expansion, be suitable for both high-temperature alloy substrates and ceramic matrix composite substrates, thereby meeting the technical requirements of different application fields such as thermal barrier coatings, environmental barrier coatings, and thermal environment barrier coatings. Summary of the Invention

[0007] This invention addresses the increasing operating temperatures of future high thrust-to-weight ratio turbine engines and the growing demand for thermally protective coatings for hot-end components. It provides a thermally protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, along with its preparation method and applications. This invention is simple and easy to implement, and the resulting composite material exhibits low thermal conductivity and a controllable coefficient of thermal expansion. It can be used on both high-temperature alloy matrices and ceramic matrix composite matrices. By adjusting the coefficient of thermal expansion, it can meet the technical requirements of various application fields, including thermal barrier coatings, environmental barrier coatings, and thermal environment barrier coatings.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A thermal protective coating material with low thermal conductivity and adjustable coefficient of thermal expansion is prepared by mechanical ball milling, cold isostatic pressing and solid-state sintering using nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder and nano-SiO2 powder as raw materials. Its chemical composition is xGd2O3-(1-x)Yb2O3-2xZrO2-(2-2x)SiO2, where the value of x ranges from 0 to x.

[0010] A thermal protective coating material with adjustable coefficient of thermal expansion and low thermal conductivity, comprising the following steps:

[0011] Step 1: Mix nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder in a certain proportion to obtain mixed powder I, wherein:

[0012] The particle size of the nano-SiO2 powder is 10–70 nm.

[0013] The particle sizes of the nano-Gd2O3 powder, nano-Yb2O3 powder, and nano-ZrO2 powder are all 20–70 nm.

[0014] Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to a ball mill jar, disperse mixed powder I in anhydrous ethanol, and perform wet ball milling to obtain a uniformly mixed slurry. After drying the uniformly mixed slurry, mixed powder II is obtained, wherein:

[0015] The amount of anhydrous ethanol used is 1 to 3 times the total mass of nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder;

[0016] The diameter of the zirconia grinding ball is 3-8 mm, and the amount of zirconia grinding ball used is 3-5 times the total mass of nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder.

[0017] The ball milling time is 12–24 h, and the rotation speed is 180–460 r / min;

[0018] The drying temperature is 80–120°C, and the drying time is 12–24 hours.

[0019] Step 3: Pre-press the mixed powder II into shape using a press, then cold isostatically press it to obtain a block raw material, wherein:

[0020] The pre-pressing mold is a stainless steel mold with a diameter of 15-25mm.

[0021] The pre-compression molding pressure is 20-100 MPa, and the holding time is 1-5 min;

[0022] The pressure of the cold isostatic pressing is 200-280 MPa, and the holding time is 5-10 min;

[0023] Step 4: Solid-state sintering of the bulk raw material or mixed powder II to obtain a multiphase ceramic material, wherein:

[0024] The reaction atmosphere for solid-state sintering is air, the solid-state sintering temperature is 1200-1600℃, and the solid-state sintering time is 2-6h.

[0025] The multiphase ceramic material has low thermal conductivity and an adjustable coefficient of thermal expansion, and can be applied to thermal barrier coatings, environmental barrier coatings, and thermal environmental barrier coatings with high-temperature alloys or ceramic matrix composites as the matrix. It has the dual functions of thermal barrier coatings and environmental barrier coatings. By adjusting the coefficient of thermal expansion to adapt to high-temperature alloy substrates or ceramic matrix composite substrates, it can be further applied to hot-end components of aero-engines and gas turbines.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This invention obtains a multiphase ceramic coating material xGd2O3-(1-x)Yb2O3-2xZrO2-(2-2x)SiO2 (0<x<1) through one-step pressureless sintering. This material has great potential for application in the fields of existing thermal barrier coating materials and environmental barrier coating materials, and even in the field of novel thermal environmental barrier coating materials.

[0028] 2. The thermal protective coating material of the present invention has a low thermal conductivity, which can reduce heat conduction to the substrate, thereby protecting the engine structure and reducing the loss of combustion heat, thus improving the engine's thermal efficiency.

[0029] 3. The thermal protective coating material of the present invention can improve the material properties of thermal barrier coatings and environmental barrier coatings. Based on the advantageous combination of thermal barrier and environmental barrier coatings, a thermal environmental barrier coating is formed, realizing the application of coatings with higher performance.

[0030] 4. The equipment and processes required for the method of the present invention are simple. Attached Figure Description

[0031] Figure 1 This is a process flow diagram for the preparation of thermal protective coating materials with low thermal conductivity and adjustable coefficient of thermal expansion.

[0032] Figure 2 The surface morphology of the nanoparticles is as follows: (a) nano Gd2O3 powder; (b) nano Yb2O3 powder; (c) nano ZrO2 powder; (d) nano SiO2 powder;

[0033] Figure 3 The following are XRD patterns of nanoparticles: (a) nano-Gd2O3 powder; (b) nano-Yb2O3 powder; (c) nano-ZrO2 powder; (d) nano-SiO2 powder;

[0034] Figure 4 This is the XRD pattern of the heat-protective coating material prepared in Example 3 after being kept at 1300℃ for 2 hours;

[0035] Figure 5 The thermal conductivity and coefficient of thermal expansion of the thermal protective coating bulk material prepared in the examples are between 1000°C and 1000°C. Detailed Implementation

[0036] The technical solution of the present invention will be further described below with reference to the embodiments, but it is not limited thereto. Any modifications or equivalent substitutions to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered within the protection scope of the present invention.

[0037] Example 1:

[0038] This embodiment provides a thermal protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, and its preparation method. The thermal protective coating material is prepared from nano-Gd₂O₃ powder, nano-Yb₂O₃ powder, nano-ZrO₂ powder, and nano-SiO₂ powder as raw materials through mechanical ball milling, cold isostatic pressing, and solid-state sintering. Its chemical composition is xGd₂O₃-(1-x)Yb₂O₃-2xZrO₂-(2-2x)SiO₂, where x = 0.1. Figure 1 As shown, the specific preparation steps are as follows:

[0039] Step 1: Mix nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder in a ratio of 0.1:0.9:0.2:1.8 to obtain mixed powder I.

[0040] Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to a ball mill jar. Disperse the mixed powder I in the anhydrous ethanol and perform wet ball milling to obtain a uniformly mixed slurry. Dry the uniformly mixed slurry to obtain the dried mixed powder II. The amount of anhydrous ethanol used is 3 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the amount of zirconium oxide balls used is 5 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the ball milling time is 18 hours, the rotation speed is 360 r / min; the drying temperature is 100℃, and the drying time is 24 hours.

[0041] Step 3: The dried mixed powder II is first pre-pressed into shape using a press, and then cold isostatically pressed to obtain a block raw material. The mold used for pre-pressing has a diameter of 15mm, the pressure of pre-pressing is 30MPa, and the holding time is 5min. The pressure of cold isostatic pressing is 200MPa, and the holding time is 5min.

[0042] Step 4: Solid-state sintering of the bulk raw material or the dry mixed powder II to obtain the heat-protective coating material, wherein: the reaction atmosphere for solid-state sintering is air, the solid-state sintering temperature is 1400℃, and the sintering time is 4h.

[0043] Example 2:

[0044] This embodiment provides a thermal protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, and its preparation method. The thermal protective coating material is prepared from nano-Gd₂O₃ powder, nano-Yb₂O₃ powder, nano-ZrO₂ powder, and nano-SiO₂ powder as raw materials through mechanical ball milling, cold isostatic pressing, and solid-state sintering. Its chemical composition is xGd₂O₃-(1-x)Yb₂O₃-2xZrO₂-(2-2x)SiO₂, where x = 0.3. Figure 1 As shown, the specific preparation steps are as follows:

[0045] Step 1: Mix nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder in a ratio of 0.3:0.7:0.6:1.4 to obtain mixed powder I.

[0046] Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to a ball mill jar. Disperse the mixed powder I in the anhydrous ethanol and perform wet ball milling to obtain a uniformly mixed slurry. Dry the uniformly mixed slurry to obtain the dried mixed powder II. The amount of anhydrous ethanol used is 3 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the amount of zirconium oxide balls used is 5 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the ball milling time is 18 hours, the rotation speed is 360 r / min; the drying temperature is 100℃, and the drying time is 24 hours.

[0047] Step 3: The dried powder II is first pre-pressed into shape using a press, and then cold isostatically pressed to obtain a block raw material. The mold used for pre-pressing has a diameter of 15mm, the pressure of pre-pressing is 30MPa, and the holding time is 5min. The pressure of cold isostatic pressing is 200MPa, and the holding time is 5min.

[0048] Step 4: Solid-state sintering of the bulk raw material or the dry mixed powder II to obtain the heat-protective coating material, wherein: the reaction atmosphere for solid-state sintering is air, the solid-state sintering temperature is 1400℃, and the sintering time is 4h.

[0049] Example 3:

[0050] This embodiment provides a thermal protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, and its preparation method. The thermal protective coating material is prepared from nano-Gd₂O₃ powder, nano-Yb₂O₃ powder, nano-ZrO₂ powder, and nano-SiO₂ powder as raw materials through mechanical ball milling, cold isostatic pressing, and solid-state sintering. Its chemical composition is xGd₂O₃-(1-x)Yb₂O₃-2xZrO₂-(2-2x)SiO₂, where x = 0.5. Figure 1 As shown, the specific preparation steps are as follows:

[0051] Step 1: Mix nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder in a ratio of 0.5:0.5:1:1 to obtain mixed powder I.

[0052] Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to a ball mill jar. Disperse the mixed powder I in the anhydrous ethanol and perform wet ball milling to obtain a uniformly mixed slurry. Dry the uniformly mixed slurry to obtain the dried mixed powder II. The amount of anhydrous ethanol used is 3 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder, and the amount of zirconium oxide balls used is 5 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder. The ball milling time is 18 hours, the rotation speed is 360 r / min, the drying temperature is 100℃, and the drying time is 24 hours.

[0053] Step 3: The dried powder II is first pre-pressed into shape using a press, and then cold isostatically pressed to obtain a block raw material. The mold used for pre-pressing has a diameter of 15mm, the pressure of pre-pressing is 30MPa, and the holding time is 3min. The pressure of cold isostatic pressing is 200MPa, and the holding time is 5min.

[0054] Step 4: Solid-state sintering of the bulk raw material or the dried mixed powder II to obtain the heat-protective coating material, wherein: the reaction atmosphere for solid-state sintering is air, the solid-state sintering temperature is 1300℃, and the sintering time is 2h.

[0055] The raw materials used in this embodiment are all nanostructured powders, such as... Figure 2 and Figure 3 As shown, the powder exhibits a nano-powder agglomeration morphology, and all oxides are pure phases.

[0056] Figure 4 The XRD pattern of the heat-protective coating material after holding at 1300℃ for 2 hours is shown in the figure. Figure 4 Analysis shows that the synthesized powder is Yb2Zr2O7 / Gd 9.33 (SiO4)6O2 composite material.

[0057] Figure 5 This graph shows the thermal conductivity and coefficient of thermal expansion of the heat-protective coating material at 1000℃. The graph indicates that the thermal conductivity of the coating material is low, suggesting good heat insulation performance. In particular, its coefficient of thermal expansion ranges from (4.79 to 10.10) × 10⁻⁶. -6 K -1 It exhibits excellent thermal expansion coefficient matching with both silicon-based ceramic composite matrix and high-temperature alloy matrix, meeting the technical requirements of various application fields such as thermal barrier coating, environmental barrier coating, and thermal environment barrier coating, and can be used in hot-end components of aero-engines and gas turbines.

[0058] Example 4:

[0059] This embodiment provides a thermal protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, and its preparation method. The thermal protective coating material is prepared from nano-Gd₂O₃ powder, nano-Yb₂O₃ powder, nano-ZrO₂ powder, and nano-SiO₂ powder as raw materials through mechanical ball milling, cold isostatic pressing, and solid-state sintering. Its chemical composition is xGd₂O₃-(1-x)Yb₂O₃-2xZrO₂-(2-2x)SiO₂, where x = 0.7. Figure 1 As shown, the specific preparation steps are as follows:

[0060] Step 1: Mix nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder in a ratio of 0.7:0.3:1.4:0.6 to obtain mixed powder I.

[0061] Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to a ball mill jar. Disperse the mixed powder I in the anhydrous ethanol and perform wet ball milling to obtain a uniformly mixed slurry. Dry the uniformly mixed slurry to obtain the dried mixed powder II. The amount of anhydrous ethanol used is 3 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the amount of zirconium oxide balls used is 5 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the ball milling time is 18 hours, the rotation speed is 360 r / min; the drying temperature is 100℃, and the drying time is 24 hours.

[0062] Step 3: The dried powder II is first pre-pressed into shape using a press, and then cold isostatically pressed to obtain a block raw material. The mold used for pre-pressing has a diameter of 15mm, the pressure of pre-pressing is 30MPa, and the holding time is 3min. The pressure of cold isostatic pressing is 200MPa, and the holding time is 5min.

[0063] Step 4: Solid-state sintering of the bulk raw material or the dried mixed powder II to obtain a heat-protective coating material, wherein: the reaction atmosphere for solid-state sintering is air, the solid-state sintering temperature is 1500℃, and the sintering time is 2h.

[0064] Example 5:

[0065] This embodiment provides a thermal protective coating material with low thermal conductivity and an adjustable coefficient of thermal expansion, and its preparation method. The thermal protective coating material is prepared from nano-Gd₂O₃ powder, nano-Yb₂O₃ powder, nano-ZrO₂ powder, and nano-SiO₂ powder as raw materials through mechanical ball milling, cold isostatic pressing, and solid-state sintering. Its chemical composition is xGd₂O₃-(1-x)Yb₂O₃-2xZrO₂-(2-2x)SiO₂, where x = 0.9. Figure 1As shown, the specific preparation steps are as follows:

[0066] Step 1: Mix nano Gd2O3 powder, nano Yb2O3 powder, nano ZrO2 powder and nano SiO2 powder in a ratio of 0.9:0.1:1.8:0.2 to obtain mixed powder I.

[0067] Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to a ball mill jar. Disperse the mixed powder I in the anhydrous ethanol and perform wet ball milling to obtain a uniformly mixed slurry. Dry the uniformly mixed slurry to obtain the dried mixed powder II. The amount of anhydrous ethanol used is 3 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the amount of zirconium oxide balls used is 5 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the ball milling time is 18 hours, the rotation speed is 360 r / min; the drying temperature is 100℃, and the drying time is 24 hours.

[0068] Step 3: The dried powder II is first pre-pressed into shape using a press, and then cold isostatically pressed to obtain a block raw material. The mold used for pre-pressing has a diameter of 15mm, the pressure of pre-pressing is 30MPa, and the holding time is 3min. The pressure of cold isostatic pressing is 200MPa, and the holding time is 5min.

[0069] Step 4: Solid-state sintering of the bulk raw material or the dry mixed powder II to obtain the heat-protective coating material, wherein: the reaction atmosphere for solid-state sintering is air, the solid-state sintering temperature is 1400℃, and the sintering time is 4h.

Claims

1. A method for preparing a thermal protective coating material with low thermal conductivity and adjustable coefficient of thermal expansion, characterized in that... The method includes the following steps: Step 1: Mix nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder and nano-SiO2 powder in a certain proportion to obtain mixed powder I; Step 2: Add anhydrous ethanol and zirconium oxide grinding balls to the ball mill jar, disperse the mixed powder I in the anhydrous ethanol, and perform wet ball milling to obtain a uniformly mixed slurry. After drying the uniformly mixed slurry, mixed powder II is obtained. Step 3: Pre-press the mixed powder II into shape using a press and then cold isostatically press it to obtain a bulk raw material. Then, perform solid-state sintering on the bulk raw material to obtain a heat-protective coating material with the chemical composition xGd2O3-(1-x)Yb2O3-2xZrO2-(2-2x)SiO2, where x takes the value of 0.3, 0.5, 0.7 or 0.

9.

2. The method for preparing a thermal protective coating material with adjustable thermal expansion coefficient and low thermal conductivity according to claim 1, characterized in that... The amount of anhydrous ethanol used is 1 to 3 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the diameter of the zirconia grinding balls is 3 to 8 mm, and the amount of zirconia grinding balls used is 3 to 5 times the total mass of nano-Gd2O3 powder, nano-Yb2O3 powder, nano-ZrO2 powder, and nano-SiO2 powder; the ball milling time is 12 to 24 hours, and the rotation speed is 180 to 460 r / min; the drying temperature is 80 to 120℃, and the drying time is 12 to 24 hours.

3. The method for preparing a thermal protective coating material with adjustable thermal expansion coefficient and low thermal conductivity according to claim 1, characterized in that... The pre-pressing mold is a stainless steel abrasive with a diameter of 15–25 mm; the pre-pressing pressure is 20–100 MPa, and the holding time is 1–5 min; the cold isostatic pressing pressure is 200–280 MPa, and the holding time is 5–10 min; the solid-state sintering reaction atmosphere is air, the solid-state sintering temperature is 1200–1600 °C, and the solid-state sintering time is 2–6 h.

4. The application of a thermal protective coating material with low thermal conductivity and adjustable coefficient of thermal expansion prepared by the method of any one of claims 1-3 in thermal barrier coatings, environmental barrier coatings and thermal environment barrier coatings.

5. The application of the thermal protective coating material with low thermal conductivity and adjustable coefficient of thermal expansion as described in claim 4 in thermal barrier coatings, environmental barrier coatings, and thermal environment barrier coatings, characterized in that... The thermal protective coating material is designed with a coefficient of thermal expansion to adapt to high-temperature alloy substrates or ceramic matrix composite substrates.

6. The application of the thermal protective coating material with low thermal conductivity and adjustable coefficient of thermal expansion as described in claim 4 in thermal barrier coatings, environmental barrier coatings, and thermal environment barrier coatings, characterized in that... The thermal barrier coating, environmental barrier coating, and thermal environment barrier coating are used in the hot-end components of aero engines and gas turbines.

Images