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Published By Cambridge University Press (Materials Research Society)

1946-4274, 0272-9172

2017 ◽  
Vol 1656 ◽  
pp. xi-xiii

2017 ◽  
Vol 1656 ◽  
pp. 381-381
Author(s):  
MaryFran Heinsch ◽  
Pamela B. Vandiver ◽  
Kyra Lyublyanovics ◽  
Alice M. Choyke ◽  
Perry Tourtellotte ◽  
...  
Keyword(s):  

2017 ◽  
Vol 1656 ◽  
pp. 383-387
Author(s):  
Lesley Frame ◽  
Donna Bright DeSorda ◽  
Yuan-Chi Chang ◽  
Pamela Vandiver

2017 ◽  
Vol 1656 ◽  
pp. f1-f10

2017 ◽  
Vol 1656 ◽  
pp. xiv-xvi

2016 ◽  
Vol 1812 ◽  
pp. 109-116
Author(s):  
César B. Pérez ◽  
C. Reyes-Betanzo

ABSTRACTAmorphous silicon (α-Si) was deposited on glass substrates by PECVD at different deposition conditions in order to characterize the residual stress on the film. Subsequently, a thermal-annealing was applied for different times at 400 °C in a N2 atmosphere, aiming to reduce the stress in the films. The deposition power was between 15 and 30 W at 13.56 MHz, the pressure in the chamber was adjusted in a range from 600 to 900 mTorr, and the temperature was varied from 140 to 200 °C. The stress was determined by using the Stoney equation, measuring the curvature and thickness of the α-Si films with a stylus profilometer. A deposition rate between 7-24 nm/min was obtained, and the time for thermal-annealing needed to reduce the stress was reduced from 10 to 2-4 h, obtaining a minimum compressive stress of 17 MPa. With this value of stress, it was possible to use the α-Si as masking material for wet etching of glass during the manufacturing of microfluidic devices, in order to obtain microstructures in the glass with 150 μm in depth.


2016 ◽  
Vol 1814 ◽  
Author(s):  
Ángeles Díaz Sánchez ◽  
Aida Contreras Ramírez ◽  
Carlos Arganis Juárez

ABSTRACTStress Corrosion Cracking (SCC) in a general term describing stressed alloy fracture that occurs by crack propagation in specifically environments, and has the appearance of brittle fracture, yet it can occur in ductile materials like AISI 304L used in internal components of Boiling Water Reactors (BWR). The high levels of oxygen and hydrogen peroxide generated during an operational Normal Water Condition (NWC) promotes an Electrochemical Corrosion Potential (ECP), enough to generate SCC in susceptible materials. Changes in water chemistry have been some of the main solutions for mitigate this degradation mechanism, and one of these changes is reducing the ECP by the injection of Hydrogen in the feed water of the reactor; this addition moves the ECP below a threshold value, under which the SCC is mitigated (-230mV vs SHE). This paper shows the characterization by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Raman Spectroscopy of the oxide film formed in to a crack propagated during a Rising Displacement Test method (RDT), on Hydrogen Water Chemistry (HWC) conditions: 20 ppb O2, 125 ppb H2, P=8MPa, T=288°C, using a CT specimen of austenitic stainless steel AISI 304L sensitized. The characterization allowed identifying the magnetite formation since an incipient way, until very good formed magnetite crystals.


2016 ◽  
Vol 1735 ◽  
Author(s):  
Youzhen Li ◽  
Xuemei Xu ◽  
Chenggong Wang ◽  
Congong Wang ◽  
Fangyan Xie ◽  
...  

ABSTRACTLead halide perovskites have proven their great power conversion efficiency (PCE) in the last few years and attracted more and more attentions. Evaporation is an important method to get high quality perovskite films, especially for surface and interface investigation, which is important for the solar cell performance. In this paper, we present our investigations on growing PbI2 and CH3NH3I films by evaporation, and then CH3NH3PbI3 films by co-evaporation. X-ray photoemisson spectroscopy (XPS) was used to characterize the films. The results showed that CH3NH3I film was not stable in vacuum. Both N and I decreased in vacuum with time elapsing. PbI2 and CH3NH3PbI3 films are quite stable. The atomic ratio of CH3NH3PbI3 films (C: N: Pb: I =1.29:1.07:1.00:2.94) is very close to the ideal CH3NH3PbI3, which indicates that evaporation is a good method to get high quality perovskite films with accurate atomic ratio.


2016 ◽  
Vol 1812 ◽  
pp. 65-70 ◽  
Author(s):  
S. Puma-Araujo ◽  
D. Olvera-Trejo ◽  
A. Elías-Zuñiga ◽  
O. Martínez-Romero ◽  
C.A. Rodríguez

ABSTRACTThe aerospace and automotive industries demand the development of new manufacturing processes. The productivity during machining of very flexible aerospace and automotive aluminum components is limited for self-excited vibrations. New solutions are needed to suppress vibrations that affect the accuracy and quality of the machined surfaces. Rejection of one piece implies an increase in the manufacturing cost and time. This paper is focused on the design, manufacturing and characterization of a magnetorheological damper. The damper was attached to a thin-floored component and a magnetic field was controlled in order to modify the damping behavior of the system. The dynamics of the machining process was developed by considering a three-degree-of-freedom model. This study was experimentally validated with a bull-nose end milling tool to manufacture monolithic parts with thin wall and thin floor. Experimental tests and characterization of the magnetorheological damper permitted to improve the surface finish and productivity during the machining of thin-floored components. A further aim of this paper was to develop a rheological damper by using magnetorheological fluids (MR) to change the thin floor rigidity with voltage. The stability of the milling process was also analytically described considering one, two or three degrees of freedom, using a mathematical integration model based on the Enhanced Multistage Homotopy Perturbation Method (EMHPM).


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