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首页> 外文学位 >Direct production of porous lanthanum strontium manganite (La(0.8)Sr(0.2)MnO(3)) in a reactive dc thermal plasma spray system.
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Direct production of porous lanthanum strontium manganite (La(0.8)Sr(0.2)MnO(3)) in a reactive dc thermal plasma spray system.

机译：在反应式直流热等离子体喷涂系统中直接生产多孔镧锶锰锰（La（0.8）Sr（0.2）MnO（3））。

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摘要

Synthesis of a La0.8Sr0.2MnO3 cathode layer in planar solid oxide fuel cell using a reactive d.c. thermal plasma spray system at atmospheric pressure and lower pressure (0.334 atm.) was proposed and studied. Two preparation methods using a reactive dc thermal plasma spray system were carried out to produce the cathode layer. One is the currently widely used d.c. thermal plasma spray method, which uses the completely prereacted La0.8Sr0.2MnO3 (LSMO) powders with a certain amount of pore former to produce the porous LSMO cathode layer. The second is our newly developed reactive d.c. thermal plasma spray method, which uses only mixed raw materials (La2O3, SrCO3, and MnCO3) in appropriate ratio to decrease the production cost of the LSMO cathode layer by decreasing process steps. In the case of the current d.c. thermal plasma spray methods, the coated LSMO layer was not completely crystallized due to the coexistence of amorphous phase. A stronger peak of the LSMO phase in our new developed method was obtained after spraying with the raw materials.; CSIRO thermochemical analysis showed that the synthesis of La0.8 Sr0.2MnO3 from the mixed raw materials is possible at the temperature range of 1,300–2,600 K. The LSMO coating layers with well-crystallization and fine open pores were obtained at the stand-off distance of 90 mm and the input power of 35 kW on the mild steel substrate with the feeding rate of 2g/min, and the stand-off distance of 94 mm and the input power of 38 kW with the feeding rate of 2.2 g/min on the zirconia, substrate. Very fine particles (20 nm) from collected powder were examined by TEM. A model for particle vaporization, temperature and velocity profiles, and heat and mass transfer in the reactor was developed. Particle size has the greatest effect to the vaporization. The stand-off distance from the spray gun to the substrate is very important with respect to the temperature and velocity history of plasma flame.; Finally these experiments have successfully demonstrated the direct production of porous lanthanum strontium manganite (La0.8Sr0.2MnO 3) in a reactive d.c. thermal plasma system to decrease the process steps of current plasma spray.
机译：利用反应性直流电在平面固体氧化物燃料电池中合成La 0.8 Sr 0.2 MnO 3 阴极层。提出并研究了在大气压和低压（0.334 atm。）下的热等离子喷涂系统。进行了使用反应性直流热等离子体喷涂系统的两种制备方法以制备阴极层。一种是目前广泛使用的直流电。热等离子喷涂方法，该方法使用具有一定成孔剂的完全预反应的La 0.8 Sr 0.2 MnO 3 （LSMO）粉末生产多孔LSMO阴极层。第二个是我们新开发的反应式直流电。热等离子喷涂法，仅使用混合原料（La 2 O 3 ，SrCO 3 和MnCO 3 0.8 Sr 0.2 MnO 3 K.在长距离为90 mm，输入功率为35 kW，进料速度为2g / min的低碳钢基材上，获得了结晶良好且开孔细小的LSMO涂层，在氧化锆基板上的最大距离为94 mm，输入功率为38 kW，进给速度为2.2 g / min。通过TEM检查来自收集的粉末的非常细的颗粒（20nm）。建立了颗粒汽化，温度和速度分布以及反应器中传热和传质的模型。粒度对汽化影响最大。就等离子火焰的温度和速度历程而言，从喷枪到基材的支撑距离非常重要。最后，这些实验成功地证明了在反应直流中直接生产多孔镧锶锶锰矿（La 0.8 Sr 0.2 MnO 3 ）。热等离子体系统可减少当前等离子喷涂的工艺步骤。

著录项

  • 作者

    Kang, Hyun-Ki.;

  • 作者单位

    University of Idaho.;

  • 授予单位 University of Idaho.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.; Physics Fluid and Plasma.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 134 p.
  • 总页数 134
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;等离子体物理学;
  • 关键词

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