Naiqing ZHANG
,
Kening SUN
,
Derui ZHOU
,
Ningning WU
材料科学技术（英）
A nitrate-citrate combustion route to synthesize La¬0.9Sr¬0.1Ga¬0.8Mg¬0.2O3-δ powder for solid oxide fuel cell application was presented. This route is based on the gelling of nitrate solutions by the addition of citric acid and ammonium hydroxide, followed by an intense combustion process due to an exothermic redox reaction between nitrate and citrate ions. The optimum technical parameters are that the pH value is 5, and the molar ratio of citric acid to the total metallic ion is 1.5:1. X-ray diffraction characterization of calcined gel shows that pure phase was synthesized after calcination at 1400℃ for 10 h, and the TEM result shows the calcined powder with average particle size is about 150 nm. The grain resistance contributes to the total resistance of sintered pellet below 500℃. The conductivity of the sintered pellet at 800℃ was 0.07 s-1•cm-1 higher than the conductivity of YSZ (0.05 s-1•cm-1 at 800℃)
关键词:
La¬
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Gang WU
,
Ning LI
,
Derui ZHOU
,
Kurachi Mitsuo
材料科学技术（英）
The metal matrix composite coatings of Co-Ni- Al2O3 were studied by electrolytic codeposition of Co-Ni alloys and Al2O3 on a Cu substrate from a sulfamate electrolyte containing Al2O3 particles. It was illustrated from the examined results of SEM, AFM and XRD that surface morphology and microstructure of Co-Ni- Al2O3 coatings appear to be mainly influenced by variations in Co content. The high Co content coatings with hcp lattice structure have a more uniform and fine structure than that of low Co content coatings with fcc lattice structure. The codeposition of Al2O3 particles in Co-Ni alloys can not change the phase structure of solid solution, only affects the growth and orientation of crystal planes and mostly increase the d value of lattice.
关键词:
Electroforming
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