In Situ Observation of Lubricant Film of Semi-Solid Lubricants at EHL Contact Using Micro-FTIR

2016 ◽  
Vol 11 (2) ◽  
pp. 376-381 ◽  
Author(s):  
Koji Takiwatari ◽  
Yasushi Hoshi ◽  
Hidetaka Nanao ◽  
Tomie Hojo ◽  
Shigeyuki Mori
Keyword(s):  
Solid Lubricants ◽  
Lubricant Film ◽  
Semi Solid ◽  
Ehl Contact

scholarly journals The influence of physical state on shikimic acid ozonolysis: a case for in situ microspectroscopy

2014 ◽  
Vol 14 (19) ◽  
pp. 10761-10772 ◽  
Author(s):  
S. S. Steimer ◽  
M. Lampimäki ◽  
E. Coz ◽  
G. Grzinic ◽  
M. Ammann
Keyword(s):  
Degradation Rate ◽  
Shikimic Acid ◽  
Bulk Material ◽  
Water Mixture ◽  
Gas Uptake ◽  
X Ray ◽  
Scanning Transmission ◽  
Dry Conditions ◽  
Semi Solid

Abstract. Atmospheric soluble organic aerosol material can become solid or semi-solid. Due to increasing viscosity and decreasing diffusivity, this can impact important processes such as gas uptake and reactivity within aerosols containing such substances. This work explores the dependence of shikimic acid ozonolysis on humidity and thereby viscosity. Shikimic acid, a proxy for oxygenated reactive organic material, reacts with O3 in a Criegee-type reaction. We used an environmental microreactor embedded in a scanning transmission X-ray microscope (STXM) to probe this oxidation process. This technique facilitates in situ measurements with single micron-sized particles and allows to obtain near-edge X-ray absorption fine structure (NEXAFS) spectra with high spatial resolution. Thus, the chemical evolution of the interior of the particles can be followed under reaction conditions. The experiments show that the overall degradation rate of shikimic acid is depending on the relative humidity in a way that is controlled by the decreasing diffusivity of ozone with decreasing humidity. This decreasing diffusivity is most likely linked to the increasing viscosity of the shikimic acid–water mixture. The degradation rate was also depending on particle size, most congruent with a reacto-diffusion limited kinetic case where the reaction progresses only in a shallow layer within the bulk. No gradient in the shikimic acid concentration was observed within the bulk material at any humidity indicating that the diffusivity of shikimic acid is still high enough to allow its equilibration throughout the particles on the timescale of hours at higher humidity and that the thickness of the oxidized layer under dry conditions, where the particles are solid, is beyond the resolution of STXM.

scholarly journals In situ study of granular micromechanics in semi-solid carbon steels

2013 ◽  
Vol 61 (11) ◽  
pp. 4169-4179 ◽  
Author(s):  
J. Fonseca ◽  
C. O’Sullivan ◽  
T. Nagira ◽  
H. Yasuda ◽  
C.M. Gourlay
Keyword(s):  
Carbon Steels ◽  
Solid Carbon ◽  
In Situ Study ◽  
Granular Micromechanics ◽  
Semi Solid

Study of Microstructure Evolution during Semi-Solid Processing of an In-Situ Al Alloy Composite

2015 ◽  
Vol 30 (3) ◽  
pp. 356-366 ◽  
Author(s):  
Santosh Kumar ◽  
Prosenjit Das ◽  
Sandeep K. Tiwari ◽  
Manas K. Mondal ◽  
Supriya Bera ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Al Alloy ◽  
Alloy Composite ◽  
Semi Solid

scholarly journals Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-Solid Al-Cu Alloys and Water-Particle Mixture

2013 ◽  
Vol 99 (2) ◽  
pp. 141-148 ◽  
Author(s):  
Tomoya Nagira ◽  
Hiroyoshi Yokota ◽  
Shugo Morita ◽  
Hideyuki Yasuda ◽  
Masato Yoshiya ◽  
...  
Keyword(s):  
Shear Deformation ◽  
In Situ Observation ◽  
Water Particle ◽  
Particle Mixture ◽  
Cu Alloys ◽  
Semi Solid

Study on Rheo-Diecasting for In Situ Synthesized Mg2Si/AM60 Composites

2011 ◽  
Vol 383-390 ◽  
pp. 707-711
Author(s):  
Hong Yan ◽  
Yong Hu ◽  
Xiao Quan Wu
Keyword(s):  
Die Casting ◽  
Casting Machine ◽  
Chinese Script ◽  
Matrix Composites ◽  
Forming Process ◽  
Magnesium Matrix ◽  
Magnesium Matrix Composites ◽  
Mechanical Stirring ◽  
Semi Solid

Magnesium alloys have high specific strength, specific stiffness, excellent thermal conductivity and casting properties, which have a great prospects development in the industry, However, its low plasticity and ductility limited its application. Magnesium matrix composites can effectively improve its performance. Magnesium alloy die-casting is the main forming process, the conventional high-pressure die-casting (HPDC) defects in multi-cavity type, easy to volume gas, non-heat-treated. Compared with HPDC, the rheo-diecasting (RDC) process has been greatly developed for near-net shape components. In this paper, Mg2Si /AM60 composites is fabricated by in-situ synthesis and semi-solid magnesium matrix composites which are rheoformed in the die-casting machine are prepared by mechanical stirring. The results indicate that the microstructure of composites is non-dendritic and Chinese script type Mg2Si are fine distributed. The fundamental morphology of microstructure by HPDC is dendrite and liquid-phase distributed between dendrite irregularly. The RDC samples have close-to-zero porosity, less segregation, the most of semi-solid of microstructure in rheo-diecasting is spherical or as-spherical structure.

scholarly journals Semi-solid compression of nano/micro-particle reinforced Al-Cu composites: An in situ synchrotron tomographic study

Materialia ◽  
2020 ◽  
Vol 12 ◽  
pp. 100817
Author(s):  
Wei Wang ◽  
Enyu Guo ◽  
A.B. Phillion ◽  
Dmitry G. Eskin ◽  
Tongmin Wang ◽  
...  
Keyword(s):  
Semi Solid

scholarly journals Development of in-situ measuring methods for mechanical properties on semi-solid aluminum alloy

2011 ◽  
Vol 61 (4) ◽  
pp. 135-141 ◽  
Author(s):  
Hiroyuki Chiba ◽  
Toru Ueki ◽  
Takanari Toriyama ◽  
Itaru Endo ◽  
Takamitsu Kobayashi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Solid Aluminum ◽  
Measuring Methods ◽  
Semi Solid
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