SHAO Zhongbao
,
LIU Kuiren
,
MENG Bo
,
LI Ying
,
YANG Yuqing(Department of Chemistry
,
Northeastern University
,
Shenyang 110006
,
China) LIU Huakun
,
DOU Shixue(University of New South Wales
,
Kensington
,
Australia)
金属学报(英文版)
Phase equilibrium in the ternary CuO-PbO-Ag system has been investigated using differential thermal analysis(DTA),thermogravimetry(TG),scanning electron microscopy(SEM) and X-ray diffraction(XRD) techniques.In the ternary CuO-PbO-Ag system,there is a eutectic reaction CuO+PbO+Ag=L at 750℃ and a composition of 12.04 mol.% Ag,16.35 mol.% CuO and 71.61 mol.% PbO.Two miscibility gaps near the two binary tie lines PbO-Ag and CuO-Ag were detected. No binary or ternary compound was detected in the ternary system.SEM and energy dispersive spectroscopy(EDS) confirm the presence of two liquid phases and the eutectic point.
关键词:
:phase equilibrium
,
null
,
null
,
null
,
null
LI Ying
,
WANG Xiaotian
,
JIN Zhihao Xi'an Jiaotong University
,
Xi'an
,
China SHl Guoshun Beijing Measuring and Analysing Center.Beijing
,
China
金属学报(英文版)
The effect of subzero treatment on the microstructure and mechanical properites of Y_2O_3- ZrO_2 ceramic have been investigated by TEM,X-ray diffraction and test of mechanical properties.It was shown that the microstructre of 3Y-PSZ after subzero treatment by liquid nitrogen exhibits very long and parallel laths of m-phase and some microcracks around the larger and finer lath of m-phase may be discovered.Suitable subzero treatment can improve the strength and toughness of Y-PSZ efficiently because of decreasing the stability of t-phase and incresing the amount of t-m transformation when exerting a stress.However,when the time of subzero treatment exceeds,the over aging effect may arise.which can decrease the strength and toughness of the material.
关键词:
Y_2O_3-ZrO_2 partially stabilized zirconia(PSZ)
,
null
,
null
谢颖
,
LI Ying
,
李瑛
,
孙挺
,
王福会
腐蚀科学与防护技术
doi:10.3969/j.issn.1002-6495.2009.02.017
利用动电位极化曲线和交流阻抗谱等电化学测量技术,研究了Q235钢表面原位生长的γ-FeOOH膜在0.25 mol/L Na2SO4+10-4mol/L NaCl、0.25 mot/L Na2SO4+10-3mol/L NaCl、0.25 mol/L Na2SO4+103mol/L NaCl水溶液中的电化学行为及在小同浓度的Cl-水溶液中.γ-FeOOH膜埘Q235钢的保护作用.结果表明,Cl-含量较低时,γ-FeOOH膜的存在明显地促进了Q235钢的阴极反应,该膜对基材无保护作用;随Cl-浓度的增加,阴极电流密度大幅减小,当Cl-浓度达到10-2mol/L时,γ-FeOOH膜能在一定程度上抑制基材的腐蚀,此时γ-FeOOH膜表现出对基材有保护作用.
关键词:
γ-FeOOH锈膜
,
Cl-浓度
,
原位生长
,
保护件能
谢颖
,
LI Ying
,
李瑛
,
孙挺
,
王福会
腐蚀科学与防护技术
doi:10.3969/j.issn.1002-6495.2009.02.018
利用动电位极化曲线和交流阻抗谱等电化学测量技术研究了Q235钢表面原位生长的α-FeOOH膜在0.25mol/L Na2SO4+10-4moL/L NaCl、0.25 mol/L Na2SO4+10-3mol/L NaCl、0.25 mol/L Na2SO4+10-2moVL NaCl水溶液中的电化学性能.在不同浓度的Cl-溶液中α-FeOOH膜对侵蚀性离子的作用机制.结果表明,Q235钢表面原位生长的α-FeOOH膜在10-4mol/L到10-2mol/LCl-浓度范围内,对基材均无保护作用;但当Cl-含量为10-2mol/L时,α-FeOOH膜的膜电阻及转移电阻皆比低氯离子浓度的要大,此时α-FeOOH膜表现出一定的抗腐蚀能力.
关键词:
α-FeOOH锈膜
,
Cl-浓度
,
原位生长
,
保护性能
