Hexaaluminate high-emissivity thermal protection coating layer and preparation method thereof
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A high-emissivity, hexaaluminate technology is applied in coating, metal material coating process, fusion spraying, etc. It can solve the problems of good thermal shock resistance and high thermal expansion ratio, and achieve thermal expansion mismatch, Improve the effect of radiation heat transfer and solve the effect of poor thermal shock resistance
Inactive Publication Date: 2012-12-12
HARBIN INST OF TECH
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[0004] The present invention aims to solve the problem that the thermal protection coating on the surface of existing high-temperature-resistant metal materials is difficult to simultaneously satisfy ...
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specific Embodiment approach 1
[0026] Specific implementation mode 1: A hexaaluminate high emissivity thermal protective coating according to this embodiment is characterized in that the chemical formula of the hexaaluminate high emissivity thermal protective coating is LaMg 1-x m x Al 11 o 19 ; wherein, M is Mn, Fe, Co or Ni, 0≤x≤1.
specific Embodiment approach 2
[0027] Embodiment 2: A method for preparing a hexaaluminate high-emissivity thermal protective coating according to this embodiment is carried out in the following steps:
[0028] 1. Al 2 o 3 and La 2 o 3 Put it into a muffle furnace, and conduct heat treatment at a temperature of 600-1200 °C for 2-10 hours to obtain Al 2 o 3 Powder and La 2 o 3 powder;
[0029] 2. According to the chemical formula LaMg 1-x m x Al 11 o 19, according to the stoichiometric ratio, weigh the Al obtained in step 1 2 o 3 Powder, La 2 o 3 Powder and A are mixed to obtain a powder mixture; wherein, the chemical formula LaMg 1-x m x al 11 o 19 M is Mn, Fe, Co or Ni, 0≤x≤1; A is MgO, MnO 2 , Fe 2 o 3 , CoO, Ni 2 o 3 One of MgO and MnO 2 , Fe 2 o 3 , CoO, Ni 2 o 3 A mixture in any proportion; MgO needs to be heat-treated by the method of step 1 before weighing;
[0030] 3. Put the powder mixture obtained in step 2 into a ball mill bottle, and add ZrO 1 to 4 times the mass of ...
specific Embodiment approach 3
[0038] Specific Embodiment 3: This embodiment differs from Specific Embodiment 2 in that the heat treatment is carried out at a temperature of 900° C. as described in Step 1. Other steps and parameters are the same as in the second embodiment.
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Abstract
The invention provides a hexaaluminate high-emissivity thermal protection coating layer and a preparation method of the hexaaluminate high-emissivity thermal protection coating layer, and relates to a thermal protection coating layer and a preparation method of the thermal protection coating layer, aiming at solving the problem that the existing high-emissivity thermal protection coating layer ispoor in thermal shock resistance, mismatched in thermal expansion and low in emissivity within a short-wave band. The thermal protection coating layer prepared by the invention has the chemical formula as shown in LaMg1-xMxAl11O19, wherein M is Mn, Fe, Co or Ni, x is larger than or equal to 0 and is less than or equal to 1. The preparation method comprises the following steps of: 1, preparing LaMg1-xMxAl11O19 feed material; 2, preparing a high-temperature alloy plate material base body; 3, preparing a NiCoCrAlYTa combination layer on the base body; and 4, preparing the LaMg1-xMxAl11O19 hexaaluminate high-emissivity thermal protection coating layer on the coating base body. The normal spectral emissivity of the thermal protection coating layer prepared by the invention is larger than 0.9 within the wave band of 7-14 mu m. The invention is suitable for the preparation of the metal material thermal protection coating layer.
Description
technical field [0001] The present invention relates to thermal protective coatings and methods for their preparation. Background technique [0002] High temperature resistant metal materials are widely used in thermal structural components and aircraft thermal protection systems. The service temperature of metal materials is restricted by their own properties. Titanium alloys can be used in an environment of 650°C; γ-TiAl alloys can withstand high temperatures of 870°C; However, the rapid development of modern aerospace and military industry technology makes the service environment of materials more harsh. In order to prevent the performance degradation of metal materials such as nickel-based superalloys at high temperatures, it is often necessary to prepare a multifunctional protective coating with anti-oxidation, thermal shock resistance and high emissivity on the surface, and dissipate most of the heat through radiation heat dissipation. lose. [0003] According to Pl...
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