A kind of in-situ synthesis and preparation method of solid oxide fuel cell connector coating
A solid oxide and fuel cell technology, applied in fuel cells, metal material coating technology, coatings, etc., can solve the difficulties of directly depositing uniform perovskite oxide coatings, cracks on the surface, and non-dense film layers, etc. problems, to achieve high-quality preparation, low densification temperature, and good electronic conductivity
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Embodiment 1
[0027] La(NO 3 ) 3 .9H 2 O(99.99%), Ni(NO 3 ) 2 .6H 2 O (Alfa Aesar, 99.9%) was added into deionized water at a molar ratio of 1:1 and mixed evenly, then an appropriate amount of citric acid was added (the molar ratio of cations in citric acid and nitrate was 1:1) and ground in a ball mill for 5 h. The rotational speed was 300 r / min, the obtained precursor was dried after evaporation and combustion, and then calcined at 450 °C for 3 h to obtain a specific surface area of 10 m 2 / g nanopowder.
[0028] After mixing the prepared nano-powder with PVA (6 wt%) and polyacrylamide (0.5 wt%) evenly, the mixture was dispersed by ultrasonic vibration for 3 h to prepare a dispersion slurry, which was coated by cold spraying method Covered on the surface-treated SUS430 stainless steel connecting body, the coating thickness is about 30μm.
[0029] The prepared powder coating was pre-oxidized at 600 °C for 3 h, and then baked at 850 °C for 10 h in an oxygen atmosphere to synthesize...
Embodiment 2
[0034] La(NO 3 ) 3 .9H 2 O(99.99%), Sr(NO 3 ) 2 (99.9%), Co(NO 3 ) 2 .6H 2 O (99.99%) was added into deionized water at a molar ratio of 3:1:2 and mixed evenly, then added an appropriate amount of citric acid (the molar ratio of citric acid to cations in the solution was 1.2:1) and ground in a ball mill for 5 h at a speed of 300 r / min, the obtained precursor was dried after evaporation and combustion, and then calcined at 450 °C for 2 h to obtain a specific surface area of 5 m 2 / g nanopowder.
[0035] After mixing the prepared nanopowder with PVP (7.5 wt%) and polyacrylamide (2.5 wt%) evenly, the mixture was dispersed by ultrasonic vibration for 5 h to prepare a dispersion slurry, which was coated by cold spraying method Covered on the surface-treated SUS430 stainless steel connecting body, the coating thickness is about 40μm.
[0036] The prepared powder coating was pre-oxidized at 600 °C for 1 h, and then baked at 850 °C for 5 h in an oxygen atmosphere to synthe...
Embodiment 3
[0039] La(NO 3 ) 3 .9H 2 O(99.99%), Sr(NO 3 ) 2 (99.9%), Mn(NO 3 ) 2 .4H 2 O (99.99%) was added into deionized water at a molar ratio of 1.6:0.4:1 and mixed evenly, then an appropriate amount of citric acid was added (the molar ratio of citric acid to cations in the solution was 1.5:1) and ground in a ball mill for 3 h at a speed of 300 r / min, the obtained precursor was dried after evaporation and combustion, and then calcined at 450 °C for 1 h to obtain nanopowders.
[0040] After mixing the prepared nano-powder with PVA (5 wt%) and polyacrylamide (1 wt%) evenly, the mixture was dispersed by ultrasonic vibration for 3 h to prepare a dispersion slurry, which was coated by cold spraying method Covered on the surface-treated Crofer22 stainless steel connector, the coating thickness is about 30μm.
[0041] The prepared powder coating was pre-oxidized at 600 °C for 5 h, and then baked at 750 °C for 5 h in an oxygen atmosphere to synthesize a dense perovskite oxide film co...
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