Preparation method of thermal barrier coating with interlayer pore structure
A technology of pore structure and thermal barrier coating, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of affecting the stability of plasma flame flow, difficult to obtain uniform coating of structure, etc., and achieve excellent high temperature Phase stability, lower thermal conductivity, and improved thermal cycle life effects
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[0030] The preparation method of the thermal barrier coating with interlayer pore structure of the present invention has the chemical formula of La 2 (Ce 1-x Zr x ) 2 O 7 (0≤x≤0.8). The preparation process includes: (1) Heat treatment La 2 O 3 , CeO 2 , ZrO 2 Powder; (2) Mix the heat-treated powder with deionized water and dispersant ball mill in proportion; (3) Dry and heat-treat the ball-milled slurry into phase; (4) Combine the phased powder, deionized water and dispersant The solution is mixed and ball milled to prepare a suspension; (5) The suspension is used as a raw material to prepare La with interlayer pore structure by plasma spraying. 2 (Ce 1-x Zr x ) 2 O 7 coating.
[0031] The preparation method of the thermal barrier coating with interlayer pore structure of the present invention includes the following steps:
[0032] (1) Mix and ball mill the heat-treated powders A, B, and C with deionized water and dispersant to obtain slurry D.
[0033] Will La 2 O 3 Powder A, CeO 2...
Example Embodiment
[0040] Example 1: Preparation of La with interlayer pore structure 2 Ce 2 O 7 Coating, the specific steps are as follows:
[0041] (1) Put La 2 O 3 , CeO 2 The powder was kept at 1000°C for 2h.
[0042] (2) The CeO after heat treatment 2 , La 2 O 3 The powder is mixed according to the molar ratio of 2:1. Add deionized water, grinding balls, and dispersant to the mixed powder. Use a planetary ball mill to ball mill for 2 hours. The quality of the added deionized water is the same as the total mass of the mixed powder. The added dispersant is The ammonium polyacrylate aqueous solution with a mass concentration of 30% is added in an amount of 10% of the total mass of the mixed powder.
[0043] (3) Dry the ball-milled slurry at 100°C for 48 hours, and put the dried powder into a muffle furnace and heat treatment at 1300°C for 6 hours to form a phase. Such as figure 1 Shown, after heat treatment La 2 Ce 2 O 7 The thermogravimetric-differential scanning calorimetry curve of the powder sho...
Example Embodiment
[0052] Example 2: Preparation of La with interlayer pore structure 2 (Ce 0.3 Zr 0.7 ) 2 O 7 Coating, the specific steps are as follows:
[0053] (1) Put La 2 O 3 , CeO 2 , ZrO 2 The powder was kept at 1000°C for 2h.
[0054] (2) The La after heat treatment 2 O 3 , CeO 2 , ZrO 2 The powder is mixed in a molar ratio of 1:0.3:0.7. Add deionized water, grinding balls, and dispersant to the mixed powder, and use a planetary ball mill for 2h. The quality of the added deionized water is the same as the total mass of the mixed powder. The added dispersion The agent is an aqueous solution of ammonium polyacrylate with a mass concentration of 40%, and the added amount is 15% of the total mass of the mixed powder.
[0055] (3) Dry the ball-milled slurry at 100°C for 48 hours, and put the dried powder into a muffle furnace for heat treatment at 1400°C for 12 hours to form a phase.
[0056] (4) La 2 (Ce 0.3 Zr 0.7 ) 2 O 7 The phase-forming powder, deionized water, and dispersant solution are mixed...
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