期刊文献+
共找到8篇文章
< 1 >
每页显示 20 50 100
N_2-O_2-SO_2气氛中沉积盐引起Fe_3Al和FeAl的热腐蚀 被引量:1
1
作者 牛焱 吴维(山文) +1 位作者 f.gesmundo F.Viani 《腐蚀科学与防护技术》 CAS CSCD 1993年第1期52-58,共7页
研究表面分別有混合盐Na_2SO_4-NaCl,Na_2SO_4-V_2O_5和纯Na_2SO_4沉积并在模拟燃气气氛中Fe_3Al和FeAl于600℃的热腐蚀,在所有试验条件下两种合金均发生热腐蚀。随试验时间的延长、纯Na_2SO_4和Na_2SO_4-NaCI引起的腐蚀明显减缓,而Na_2... 研究表面分別有混合盐Na_2SO_4-NaCl,Na_2SO_4-V_2O_5和纯Na_2SO_4沉积并在模拟燃气气氛中Fe_3Al和FeAl于600℃的热腐蚀,在所有试验条件下两种合金均发生热腐蚀。随试验时间的延长、纯Na_2SO_4和Na_2SO_4-NaCI引起的腐蚀明显减缓,而Na_2SO_4-V_2O_5的腐蚀则加剧并长时持续。FeAl一般较之Fe_3AI耐蚀,只有在Na_2SO_4-NaCl情况下两者腐蚀性能相近。所有合金的腐蚀产物层总是由一高铁的外层和含铝与铁和少量硫的内层组成,后者的成分随所涂盐的组成而变化。在一定程度上腐蚀机制涉及氧化-硫化与氧化物的熔融等。 展开更多
关键词 热腐蚀 FE3AL FEAL 氯化钠 氧化钒
下载PDF
Cu-25Ni-25Ag三元合金在600℃和700℃空气中的氧化 被引量:1
2
作者 赵泽良 牛焱 +1 位作者 f.gesmundo 吴维 《中国有色金属学报》 EI CAS CSCD 北大核心 2001年第2期183-186,共4页
研究了Cu 2 5Ni 2 5Ag合金在 6 0 0℃和 70 0℃空气中的氧化。合金由富Ag的α相与Cu Ni固溶体 β相组成。氧化速率大致服从抛物线规律 ,除短时间的加速氧化外 ,随着氧化的进行氧化速率逐渐减小。尽管存在Ag和Ni,但合金成膜速率与纯Cu的... 研究了Cu 2 5Ni 2 5Ag合金在 6 0 0℃和 70 0℃空气中的氧化。合金由富Ag的α相与Cu Ni固溶体 β相组成。氧化速率大致服从抛物线规律 ,除短时间的加速氧化外 ,随着氧化的进行氧化速率逐渐减小。尽管存在Ag和Ni,但合金成膜速率与纯Cu的相近。在不同温度下合金都形成了外层为CuO ,内层为Cu2 O ,NiO和Ag颗粒组成的复杂氧化膜。同时 ,氧化膜最前沿的Cu Ni固溶体颗粒仅表面部分氧化 。 展开更多
关键词 三元合金 Cu-Ni-Ag 双相合金 氧化 铜合金
下载PDF
显微组织对Cu-Cr-Ni合金高温氧化行为的影响 被引量:1
3
作者 曹中秋 牛焱 f.gesmundo 《中国有色金属学报》 EI CAS CSCD 北大核心 2001年第3期394-397,共4页
研究了两种单 /双相Cu Cr Ni合金的高温氧化行为。结果表明 ,合金氧化动力学偏离抛物线规律 ,其瞬时抛物线速率常数随时间延长而降低。两种合金表面氧化膜的结构差别较大 ,单相合金表面形成一连续的Cr2 O3 层 ,双相合金表面氧化膜外层... 研究了两种单 /双相Cu Cr Ni合金的高温氧化行为。结果表明 ,合金氧化动力学偏离抛物线规律 ,其瞬时抛物线速率常数随时间延长而降低。两种合金表面氧化膜的结构差别较大 ,单相合金表面形成一连续的Cr2 O3 层 ,双相合金表面氧化膜外层是一连续的CuO层 ,Ni和Cr的氧化发生在合金内部。这种合金与氧化物共存的混合内氧化与经典的内氧化明显不同 ,氧化层最里面形成了一连续的Cr2 O3 膜 ,抑制了合金的进一步氧化。 展开更多
关键词 Cu-Ni-Cr合金 高温氧化 铜合金 显微组织
下载PDF
纳米晶Ni-Ag合金在600-700℃的空气氧化
4
作者 赵泽良 牛焱 f.gesmundo 《中国腐蚀与防护学报》 CAS CSCD 2001年第5期257-264,共8页
利用球磨和热压致密化过程 ,得到富Ag和富Ni相均匀分布的纳米晶Ni-Ag双相合金 .研究了含Ni分别为 50at%和 75at%的Ni- 50Ag和Ni- 2 5Ag合金在 60 0~ 70 0℃空气中的氧化 .Ni- 50Ag合金形成了Ni内氧化结构 ,最外层为连续Ag层 ,其氧化速... 利用球磨和热压致密化过程 ,得到富Ag和富Ni相均匀分布的纳米晶Ni-Ag双相合金 .研究了含Ni分别为 50at%和 75at%的Ni- 50Ag和Ni- 2 5Ag合金在 60 0~ 70 0℃空气中的氧化 .Ni- 50Ag合金形成了Ni内氧化结构 ,最外层为连续Ag层 ,其氧化速率大于纯Ni.相反 ,Ni- 2 5Ag合金则形成了连续的NiO外氧化层且最外层为不连续的Ag层 .Ni- 2 5Ag合金氧化初期服从抛物线速率常数关系 ,随后氧化速率显著减小甚至小于纯Ni.合金的双相结构特性以及合金中极小的晶粒尺寸导致了上述结果的产生 . 展开更多
关键词 机械合金化 纳米晶 氧化 双相合金 高温氧化 镍合金
下载PDF
Phase Stability, Kinetic Diagrams and Diffusion Path in High Temperature Oxidation of Binary Solid-Solution Alloys 被引量:1
5
作者 YanNIU f.gesmundo 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第6期545-552,共8页
The phase diagrams of ternary systems involving two metal components and one oxidant are considered first, the limitations to their use is discussed in relation to the high temperature oxidation of binary alloys. Kine... The phase diagrams of ternary systems involving two metal components and one oxidant are considered first, the limitations to their use is discussed in relation to the high temperature oxidation of binary alloys. Kinetic diagrams, which are useful to predict the conditions for the stability of the two mutually insoluble oxides as the external scale, are then calculated on the basis of thermodynamic and kinetic data concerning both the alloys and the oxides, assuming the validity of the parabolic rate law. A combination of the two types of diagrams provides a more detail information about the oxidation behavior of binary alloys. The calculation of the diffusion paths, which relate the oxidant pressure to the composition of the system in terms of the alloy components both in the alloy and in the scale during an initial stage of the reaction in the presence of the parabolic rate law, is finally developed. 展开更多
关键词 Binary alloys OXIDATION Therniodynamic and kinetic diagrams Diffusion path
下载PDF
SULFIDATION OF Co-15wt%Y ALLOY IN H_2-H_2S MIXTURES AT 600-800℃ 被引量:1
6
作者 NIU Yan f.gesmundo +3 位作者 WU Weitao ZENG Chaoliu F.VIANI (State Key Laboratory for Corrosion and Protection,Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences,Shenyang.110015,China)(Istituto di Chimica,Facolta’di Ingegneria,Universita’di 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第1期1-11,共11页
The corrosion properties of a Co-15wt% Y alloy were studied in H_2-H_2S mixtures under a sulfur pressure of 10-3 Pa at 600-800℃ and of 10-2 Pa at 800℃ to examine the effect of Y on the resistance of pure cobalt to s... The corrosion properties of a Co-15wt% Y alloy were studied in H_2-H_2S mixtures under a sulfur pressure of 10-3 Pa at 600-800℃ and of 10-2 Pa at 800℃ to examine the effect of Y on the resistance of pure cobalt to sulfur attack at high temperatures.The alloy is nearly single-phase.containing mostly the intermetallic compound Co17Y2 plus a little amount of the solid solution of Y in cobalt.At 600-700℃ and at 800℃ under 10-2 Pa of S2 the alloy forms multi-layered scales consisting of an outer region of pure cobalt sulfide,an intermediate region of a mixture of the sulfides of the two metals and finally an innermost layer of a mixture of yttrium sulfide with metal cobalt.At 800℃ under 10-3Pa of S2,below the dissociation pressure of cobalt sulfide, the alloy forms only a single layer composed of a mixture of metallic cobalt with yttrium sulfide.Pure Y produces only the oxysulfide Y2O2S, as a result of the good stability of this compound and of the presence of some impurities in the gas mixtures used The corrosion kinetics is generally rather complex and irregular except al 800℃under 10-3 Pa of S2.The addition of yttrium always reduces the sulfidation rate of cobalt, even though the formation of a continuous protective external layer of yttrium sulfide is never achieved.The internal sulfidation of Y in Co-15% Y is not associated with a depletion of Y in the alloy.This kind of diffusionless internal attack is typical of alloys with a very small solubility of the most reactive component Y in the base metal A.which restricts severely the Y flux from the alloy towards the alloy-scale interface. 展开更多
关键词 cobalt-yttrium alloy high temperature SULFIDATION
下载PDF
Air oxidation of Cu-50Ni and Cu-70Ni alloys at 800℃ 被引量:1
7
作者 曹中秋 牛焱 f.gesmundo 《中国有色金属学会会刊:英文版》 CSCD 2001年第4期499-502,共4页
The air oxidation of Cu Ni alloys with 50% and 70% nickel (mole fraction) at 800?℃ was studied. The kinetic curves for the oxidation of the two alloys are complex and deviate from the parabolic rate law. Typical doub... The air oxidation of Cu Ni alloys with 50% and 70% nickel (mole fraction) at 800?℃ was studied. The kinetic curves for the oxidation of the two alloys are complex and deviate from the parabolic rate law. Typical double layered scales are produced, which consist of a CuO outer layer and an inner layer containing a mixture of Cu 2O and NiO with many pores. Cu 50Ni presents a small degree of internal oxidation of nickel, which is observed in many binary double phase systems, but is quite rare in single phase systems. 展开更多
关键词 copper nickel alloy single phase high temperature oxidation
下载PDF
Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃
8
作者 f.gesmundo F.Viani Y.NIU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1993年第3期167-171,共5页
The corrosion of alloys based on Fe,Co and Ni containing 15 and 30 wt-% Nb was studied at 700℃ in H_2-H_2S mixtures providing 10^(-8) atm S_2.The Fe and Co-based alloys formed duplex scales with an outer layer of pur... The corrosion of alloys based on Fe,Co and Ni containing 15 and 30 wt-% Nb was studied at 700℃ in H_2-H_2S mixtures providing 10^(-8) atm S_2.The Fe and Co-based alloys formed duplex scales with an outer layer of pure base-metal sulphide and an inner layer containing both metals.The Nb addi- tions were not able to produce exclusive Nb sulphidation but yielded a significant decrease of the corrosion rates for both types of alloys with respect to the pure metals even though they were still much higher than that of pure Nb.The Ni-base alloys corroded rapidly forming a single complex scale layer,mainly due to the appearance of a liquid Ni-S solution. 展开更多
关键词 NIOBIUM ALLOYS sulphidation high temperature
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部