In situ investigations of the interaction of small inorganic acidifying molecules in humidified air with polycrystalline metal surfaces by means of TM-AFM, IRRAS, and QCM

2007 ◽  
Vol 39 (8) ◽  
pp. 702-710 ◽  
Author(s):  
Ch. Kleber ◽  
U. Hilfrich ◽  
M. Schreiner
Keyword(s):  
Metal Surfaces ◽  
Polycrystalline Metal ◽  
Humidified Air

Phase Structure and Lubricity of In-Situ Generated Protective Layer on Worn Metal Surfaces in Presence of Mg6Si4O10(OH)8

2005 ◽  
Author(s):  
Yuansheng Jin ◽  
He Yang ◽  
Feng Wang ◽  
C. Minfray ◽  
Shenghua Li
Keyword(s):  
Iron Oxide ◽  
Wear Debris ◽  
Metal Surfaces ◽  
Protective Layer ◽  
Magnesium Silicate ◽  
Main Constituent ◽  
Crystalline Anisotropy ◽  
Mechanochemical Reactions ◽  
Habit Planes

A mechanochemical reconditioner package has been investigated in our laboratory which could be used to generate an in situ protective layer on worn metal surfaces as a result of mechanochemical reactions between worn tribosurfaces, wear debris and a special reconditioner formulation. The main constituent in the reconditioner formulation chemistry is magnesium silicate hydroxide, Mg6(Si4O10)(OH)8. HRTEM analyses have displayed that the protective layer consists mainly of cementite nanocrystals with crystalline anisotropy. Nanoparticles of magnet iron oxide (Fe3O4) and iron peroxide (FeOOH) are dispersed on the habit planes of nanocrystalline cementite matrix. The protective layer obtained exhibits very smooth top surface and excellent tribological characteristics.

Observation of ion-induced ripples in Cu(001)

2003 ◽  
Vol 777 ◽  
Author(s):  
Wai Lun Chan ◽  
Niravun Pavenayotin ◽  
Eric Chason
Keyword(s):  
Light Scattering ◽  
Metal Surfaces ◽  
Linear Instability ◽  
Ion Flux ◽  
Semiconductor Surfaces ◽  
Stages Of Growth ◽  
Early Stages ◽  
Ripple Formation ◽  
Instability Theory

AbstractA linear instability theory proposed by Bradley and Harper accounts for many of the features of ripple formation on amorphous and semiconductor surfaces, but it is not consistent with measurements of sputtered metal surfaces. In the present work, we report observations of sputter ripples on Cu(001) surfaces which are similar to amorphous and semiconductor systems. By using higher ion flux and temperature than previously used, we have produced ripples in which the wavelength is independent of time and the amplitude increases exponentially during the early stages of growth. The ripple evolution was measured using in situ light scattering during sputtering.

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