Gradient nano-coating used for thermal barrier coating anti-corrosion function and preparation method thereof

A technology of nano-coating and thermal barrier coating, which is applied in the field of gradient nano-coating and its preparation, can solve problems such as thermal expansion coefficient mismatch, peeling off of the outer anti-corrosion alumina coating, etc., to overcome the difference in thermal expansion coefficient, method Simple and easy to implement, the effect of uniform coating structure

Inactive Publication Date: 2013-04-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One of the objects of the present invention is to provide a gradient YSZ/Al for thermal barrier coating anti-corrosion function 2 o 3 Nano-coating to solve the problem that the thermal expansion coefficient of the YSZ materi

Method used

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  • Gradient nano-coating used for thermal barrier coating anti-corrosion function and preparation method thereof
  • Gradient nano-coating used for thermal barrier coating anti-corrosion function and preparation method thereof

Examples

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Example Embodiment

[0018] Example one

[0019] YSZ / Al 2 O 3 The preparation method of gradient nano-coating is realized by the following steps:

[0020] The first step: the monoclinic YSZ sol with a solid content of 2wt% and Al with a solid content of 2wt% 2 O 3 Sol, prepare YSZ-Al according to the volume ratio of 3:1, 1:1 and 1:3 2 O 3 Mix the sol.

[0021] Step 2: Use a dip coater to dip the zirconia ceramic substrate in sequence with YSZ sol, YSZ-Al with a volume ratio of 3:1, 1:1 and 1:3 2 O 3 Mixed sol, and Al 2 O 3 Sol. The descending and ascending rates are respectively 20mm / min, the immersion time is 120s, and the drying is at 100°C. Each sol was dip coated 5 times and calcined at 600°C for 2 hours. A gradient nano-coating structure with a total thickness of 1.23 μm and a particle size of 10-100 nm was prepared (see the SEM images of the surface and cross section figure 1 ). according to figure 1 (2) The cross-sectional view of the coating shows that there is no obvious boundary between the...

Example Embodiment

[0022] Example two

[0023] YSZ / Al 2 O 3 The preparation method of gradient nano-coating is realized by the following steps:

[0024] The first step: the monoclinic YSZ sol with a solid content of 2wt% and Al with a solid content of 2wt% 2 O 3 Sol, respectively according to the volume ratio of 9:1, 3:1, 3:2, 1:1, 2:3, 1:3 and 1:9 to prepare YSZ-Al 2 O 3 Mix the sol.

[0025] Step 2: Use a dip coater to dip the zirconia ceramic substrate into YSZ sol in sequence with a volume ratio of 9:1, 3:1, 3:2, 1:1, 2:3, 1:3 and 1:9 YSZ-Al 2 O 3 Mixed sol, and Al 2 O 3 Sol. The descending and ascending rates are respectively 20mm / min, the immersion time is 120s, and the drying is at 100°C. Each sol was dip-coated 5 times and calcined at 800°C for 2 hours. A gradient nano-coating structure with a total thickness of 5.0 μm and a particle size of 10-100 nm is prepared.

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Abstract

The invention discloses a gradient nano-coating used for a thermal barrier coating anti-corrosion function and a preparation method thereof. A substrate is steeped and lifted in pure sol and mixed sol of yttria stabilization zirconia (YSZ) and Al 2O3. A gradient coating structure with proportion of the YSZ and the Al2O3 changed from inside to outside is obtained in a prepared mode. The gradient nano-coating is composed of particles with the particle diameter of 10 to 100nm. The total thickness of the coating is 0.5 to 5 micrometers. According to the novel gradient coating structure, the facts that anti-corrosion property of the Al2O3 is kept and meanwhile a phenomenon of coating exfoliation due to difference of thermal expansion coefficients between the YSZ and the Al2O3 materials is overcome are hopeful to be achieved, the gradient nano-coating structure is prepared through a mixed sol steeping and lifting method, and then high temperature roasting is conducted. A composition weight ratio of the YSZ to the Al2O3 in the mixed sol changes between 9 to 1 and 1 to 9. The particles contained by the YSZ sol are in a monoclinic crystal shape. Temperature of the high temperature roasting is 500 to 800 DEG C. The preparation method is simple and convenient to achieve, and practical. The coating prepared is even in structure.

Description

technical field [0001] The invention relates to a gradient nano-coating used for the anti-corrosion function of thermal barrier coatings and a preparation method thereof, belonging to the technical field of anti-corrosion protection of thermal barrier coatings. Background technique [0002] Thermal barrier coatings (Thermal barrier coatings, TBCs) are currently one of the most advanced high-temperature protective coatings. By depositing one or more layers of ceramic coatings on the metal surface, a large temperature gap is generated between the high-temperature gas and the working substrate. To protect the metal substrate in the high temperature working environment, to prolong the life of the parts and improve the thermal efficiency of the heat engine. Since the 1970s, Y 2 o 3 Stable ZrO 2 Since (YSZ) thermal barrier coatings were successfully applied to aeroengine combustion chambers and other high-temperature components, YSZ TBCs have been widely used in aero turbines, ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/10C04B35/622
Inventor 施利毅袁帅刘瑞丽王竹仪赵尹张美红
Owner SHANGHAI UNIV
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