Nanostructured Materials in Extreme Environments: Nanostructured Materials in Space and Other Extreme Environments
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS Structural Materials Division, TMS: Nanomechanical Materials Behavior Committee, TMS: Advanced Characterization, Testing, and Simulation Committee, TMS: Mechanical Behavior of Materials Committee, TMS: Nuclear Materials Committee
Program Organizers: Haiming Wen, Missouri University of Science and Technology; Nan Li, Los Alamos National Laboratory; Youxing Chen, University of North Carolina Charlotte; Yue Fan, University of Michigan; Niaz Abdolrahim, University of Rochester; Khalid Hattar, University of Tennessee Knoxville; Ruslan Valiev, UFA State Aviation Technical University; Zhaoping Lu, University of Science and Technology Beijing
Thursday 2:00 PM
March 23, 2023
Room: Aqua 303
Location: Hilton
Session Chair: Haiming Wen, Missouri University of Science and Technology
2:00 PM
Characterization of Newly Developed Nanolubricants for Space Applications: Ayten Bakhtiyarova1; Mostafa Hassanalian1; Sayavur Bakhtiyarov1; 1New Mexico Institute of Mining and Technology
The traditional lubricating materials used in space have limited lifetimes in vacuum due to the catalytic degradation on metal surfaces, high vaporization at high temperatures, dewetting, and other disadvantages. The lubricants for the space applications must have vacuum stability, high viscosity index, low creep tendency, good elastohydrodynamic and boundary lubrication properties, optical or infrared transparency, and radiation atomic oxygen resistance. The addition of nanosize particles is one of the methods to enhance the thermophysical and heat transfer properties of liquid lubricants. Some of these properties for liquid lubricants are volatility, creep, surface tension, viscosity, chemical composition, weight loss, density, vapor pressure, etc. The rheological and heat and mass transfer measurements for newly developed nanolubricants were conducted using Differential Scanning Calorimetry (DSC), rotational rheometer of “parallel-plates” mode and Thermogravimetric Analyzer (TGA).
2:20 PM
Cu NW Degradation Under High Vacuum Environment: Diego Santa Rosa Coradini1; Stefan Pogatscher1; Cameron Quick1; Matheus Tunes2; Peter J. Uggowitzer1; Thomas Kremmer1; 1Montauniversty Leoben; 2Los Alamos National Laboratory
Nanomaterials are novel materials with a broad range of applications that can sustain different properties than their bulk counterparts due to their large surface-to-volume ratio (SVR). SVR is commonly addressed to phenomena like melting-point depression and Rayleigh instability, which are controlled by surface-activated mechanisms. Therefore, Cu nanowires with radii between 20 and 70 nm were studied within a transmission electron microscope (high vacuum conditions) while heated under temperatures varying from 600 to 850°C. With the help of selected area electron diffraction (SAED), high-resolution brightfield TEM, electron dispersive electroscopy (EDS), and scanning transmission electron microscope (STEM) imaging. It was observed that Cu NW sublimates before the thermodynamical prediction of 750°C at a pressure of around 4x10-6 Pa. We will discuss whether cohesive energy reduction due to the size effect or an imbalance of the condensation-sublimation plays a major role in these observations.
2:40 PM
Oxidation Resistance of Silicon-Boron Coatings on TZM Molybdenum Alloy: Miriem Santander Borrego1; Chris Wood1; 1Defence Science and Technology Group
TZM is a molybdenum-based alloy that finds widespread use in high temperature applications, such as rocket nozzles. Despite its good strength and stiffness properties at high temperatures, TZM is restricted in its applications due to active oxidation at temperatures above 700 °C. Environmental barrier coatings play an important role in permitting the use of TZM at high operating temperatures. The aim of this research was to improve the oxidation resistance of a TZM alloy by application of a silicon-boron (Si-B) coating using a pack cementation technique. Optical microscopy and scanning electron microscopy using energy dispersive spectroscopy of coated and uncoated coupons before and after oxy-acetylene thermal exposure tests revealed the efficacy of the Si-B coating on TZM alloy. The results of this work indicate that compared with the uncoated coupons, the Si-B –coated TZM exhibited less oxidative degradation after three minutes of thermal exposure to a 6 MW/m2 heat flux.
3:00 PM
Study on Advanced Cementing Practices using Inert Graphene Nanoplatelets and Hydraulic Fracturing Fluids for Wellbore Integrity and Sustainability: Havila Jupudi1; Gabriel Awejori1; Cody Massion1; Mileva Radonjic1; 1Oklahoma State University
Cementing geothermal wells that are used for energy production where higher temperatures have steam, or water and steam as continuous phases is challenging. Cementing issues between rock formations and casing may cause circulation loss and could potentially cause formation damage. Furthermore, wellbores are exposed to harsh fluids including geofluids, hydraulic fracturing fluid, drilling fluids, carbon dioxide, hydrogen sulfide, and more. In these conditions cement also undergoes expansion and contraction based on material thermal expansion as exposed to hot and cold cycles under the subsurface conditions. In cementing operations, use of suitable and sustainable additives can potentially improve the pore structure and mechanical strength thus preventing wellbore leakage by maintaining zonal isolation and enhancing mechanical strength. For this purpose, two sets of samples with: contaminating fluids and graphene nanoplatelets, at simulated thermal cycling were investigated to evaluate the petrophysical, microstructural, and micromechanical changes when compared to a control neat cement sample.