Method for preparing gradient thermal barrier coating

A thermal barrier coating, gradient technology, applied in the direction of coating, metal material coating process, fusion spray plating, etc., can solve the problems of many process influencing factors, no mature technical solution, and immature gradient thermal barrier coating method. , to achieve the effect of improving bonding force, improving wettability and alleviating thermal stress

Active Publication Date: 2015-05-20
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current gradient thermal barrier coating method is immature, and there are many factors affecting the process. The interaction

Method used

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  • Method for preparing gradient thermal barrier coating
  • Method for preparing gradient thermal barrier coating
  • Method for preparing gradient thermal barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of ZrO on the Surface of Titanium Alloy TC4 2 Gradient thermal barrier coating, specifically as follows:

[0025] The first step is to soak the cut titanium alloy substrate in acetone for 5-8 minutes to remove oil stains, take the titanium alloy out of the acetone, wash it with clean water, dry it, and finally perform sandblasting treatment to strengthen the substrate and thermal barrier Coating contact area.

[0026] In the second step, the 25nm ZrO 2 Initial Nanoparticle Doping Micron-scale Y 2 o 3 powder, to obtain doped ceramic particles, Y 2 o 3 The mass of the powder accounts for 5% of the mass of the doped ceramic particles. The doped ceramic particles are prepared by spray drying to obtain micron-sized ceramic particles of 40-70 μm. The main process parameters of spray drying are drying air temperature 270 ° C, atomizer frequency 150 Hz, The speed of the feed pump is 30r / min, and the temperature of the air outlet is 110°C. Finally, the surface...

Embodiment 2

[0030] Preparation of Al on the surface of Q235 steel 2 o 3 Gradient thermal barrier coating, specifically as follows:

[0031] The first step is to soak the cut Q235 steel substrate in acetone for 5-8 minutes to remove oil stains, remove the titanium alloy from the acetone, wash it with clean water, dry it, and finally perform sandblasting treatment to strengthen the substrate and coating the contact area.

[0032] In the second step, 40nm Al 2 o 3 The initial nanoparticles are doped with micron-level CaO powder to obtain doped ceramic particles. The mass of CaO powder accounts for 7% of the mass of doped ceramic particles. The doped ceramic particles are prepared by spray drying to obtain micron-sized ceramic particles of 50-80 μm, which are spray-dried The main process parameters are drying air temperature 270°C, atomizer frequency 150Hz, feed pump speed 30r / min, air outlet temperature 110°C. Finally, the surface coating of the ceramic particles is carried out, and the...

Embodiment 3

[0036] Preparation of ZrO on the surface of Q235 steel 2 Gradient thermal barrier coating, specifically as follows:

[0037] In the first step, soak the cut Q235 steel substrate in acetone for 5-8 minutes to remove oil stains, take the Q235 steel out of the acetone, wash it with clean water, and dry it.

[0038] In the second step, 40nm ZrO 2 The initial nanoparticles are doped with micron-level MgO powder to obtain doped ceramic particles. The mass of MgO powder accounts for 8% of the mass of doped ceramic particles. The doped ceramic particles are prepared by spray drying to obtain micron-sized ceramic particles of 40-70 μm, which are spray-dried The main process parameters are drying air temperature 270°C, atomizer frequency 130Hz, feed pump speed 30r / min, air outlet temperature 110°C. Finally, the surface coating of the ceramic particles is carried out, and the nickel-based alloy powder is coated on the surface of the doped ceramic particles by means of electroless plati...

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Abstract

The invention discloses a method for preparing a gradient thermal barrier coating and the method is used for preparing the gradient thermal barrier coating on the surface of a metal. 40-80mu m ceramic particles are bound on the surface of a metal substrate by virtue of a thermal spraying or laser cladding method to prepare the nano-ceramic particle-reinforced thermal barrier coating, wherein the nano-ceramic particles are uniformly dispersed and have a particle size of 100-500nm, the 40-80mu m ceramic particles are obtained by agglomerating initial nanoparticles and comprise Al2O3 particles, ZrO2 particles and rare earth zirconate particles and the component of the rare earth zirconate particles is A2Zr2O7, wherein A is one or more of Ln, La, Gd and Nd. The gradient thermal barrier coating prepared by the method is good in thermal-insulation effect and is firmly bound with the metal substrate and the problems that the existing gradient thermal barrier coating is difficult to be successfully applied and is easy to fall off to cause failure under thermal cycling conditions are solved.

Description

technical field [0001] The invention belongs to the field of thermal barrier coating preparation, and more specifically relates to a method for preparing a gradient thermal barrier coating on the surface of a metal substrate. Background technique [0002] Depositing a layer of ceramic coating on the surface of high-temperature resistant metal can play a role of heat insulation, which can effectively reduce the temperature of the alloy matrix, so that devices made of it, such as engine turbine blades, can operate at high temperatures. However, due to the very harsh working environment of the components, the ceramic coating is in alternating thermal cycle conditions, washed by high-temperature combustion dust, coupled with discontinuous changes in the composition of the coating and the difference in thermal expansion coefficient between metal and ceramics. High stress will be generated in the ceramic coating, causing more and more stress concentration, resulting in the diffusi...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C24/10C23C4/06
CPCC23C24/10
Inventor 刘德健唐峰梅刚张舒
Owner HUAZHONG UNIV OF SCI & TECH
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