The role of metal nanoparticles and nanonetworks in alloy degradation

被引：33

作者：

Zeng, Z. ^{[1
]}

Natesan, K. ^{[1
]}

Cai, Z. ^{[2
]}

Darling, S. B. ^{[3
]}

机构：

[1] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA

来源：

NATURE MATERIALS | 2008年 / 7卷 / 08期

关键词：

D O I：

10.1038/nmat2227

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oxide scale, which is essential to protect structural alloys from high-temperature degradation such as oxidation, carburization and metal dusting, is usually considered to consist simply of oxide phases. Here, we report on a nanobeam X-ray and magnetic force microscopy investigation that reveals that the oxide scale actually consists of a mixture of oxide materials and metal nanoparticles. The metal nanoparticles self-assemble into nanonetworks, forming continuous channels for carbon transport through the oxide scales. To avoid the formation of these metallic particles in the oxide scale, alloys must develop a scale without spinel phase. We have designed a novel alloy that has been tested in a high-carbon-activity environment. Our results show that the incubation time for carbon transport through the oxide scale of the new alloy is more than an order of magnitude longer compared with commercial alloys with similar chromium content.

引用

页码：641 / 646

页数：6

共 32 条

[11] Failure mechanisms and material degradation processes at high temperatures in ammonia synthesis [J].