Rong TU
,
Takashi GOTO
材料科学技术（英）
The oxidation behavior of Hastelloy-XR alloy was investigated to obtain the optimum surface condition for corrosion-resistant glass-coatings. The surface morphology of oxide scales changed significantly with variation of temperature and oxygen partial pressure. The oxidation kinetics was mainly parabolic independent of oxidation conditions. The oxide scales were consisted of inner Cr2O3 and outer spinel layers. The phase component of spinel layers were Mn1.5Cr1.5O4 and (Mn,Ni)(Cr,Fe)2O4 for the oxygen partial pressures po2< 10kPa and po2>10kPa, respectively. The optimum oxidation condition to obtain an oxide scale for well-adhered glass-coating to the substrate was 1248K and po2=0.01kPa for the oxidation time of 43ks.
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Oxidation
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null
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Qiang SHEN
,
Lianmeng ZHANG
,
Lidong CHEN
,
Takashi GOTO
,
Toshio HIRAI
材料科学技术（英）
In contrary to the commonly used arc melting method, samples in the present paper were prepared by the solid state reaction from elemental powders at 1173 K under a flowing Ar atmosphere for 96~168 h. The constituent phases and the elemental compositions were determined and shown that the samples were of single phase and stoichiometry. Then the spark plasma sintering technique was used to consolidate them. It is found that, dense ZrNiSn-based compounds with fine grain size and homogeneous microstructure were achieved under the condition of 1123 K/40 MPa/25 min.
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ZrNiSn
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null
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null
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张允书
中国腐蚀与防护学报
本文综述了有关热腐蚀机理的研究成果,着重叙述目前仍被公认的盐溶机理模型的研究进展,包括Rapp-Goto准则和金属氧化物在熔融Na_2SO_4中溶解度的实验测试。并以实验事实为依据阐述了盐溶机理模型的局限性,提出热腐蚀是依电化学机制发展的观点,依此举例说明金属和合金的热腐蚀历程。
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