Advanced Materials for Harsh Environments: Session II
Sponsored by: ACerS Electronics Division, ACerS Other
Program Organizers: Navin Manjooran, Solve; Gary Pickrell, Virginia Tech
Tuesday 2:00 PM
November 3, 2020
Room: Virtual Meeting Room 29
Location: MS&T Virtual
Funding support provided by: NACE International
Session Chair: Weining Wang, Virginia Commonwealth University; Gurbinder Kaur, Simon Fraser University; Gary Pickrell, Virginia Tech; Navin Manjooran, Solve Technology And Research, Inc.
2:00 PM Keynote
AM Smart Components: Additively Manufactured Gas Turbine Components, with Embedded Sensors for Harsh Environment Applications: Ramesh Subramanian1; Jeff Brogan2; Navin Manjooran3; 1Siemens Energy Inc.; 2Mesoscribe Technologies Inc.; 3Solve Technology and Research, Inc.
Additive Manufacturing (AM) of metallic components is unlocking new design options for high efficiency gas turbine component designs not possible by conventional manufacturing technologies. The market requirement for fast introduction of AM components into harsh gas turbine operational environments, necessitates the reduction of risk by integrating sensors with AM components. With real-time sensing integrated into AM components, a 30-50% acceleration in product deployment of high efficiency components is possible. The presentation will discuss the application of wear sensors in gas turbine components and the critical data available to designers regarding the complex loading conditions mating interfaces. An exemplary component such as a transition mouth seal will be used to verify and validate the development approach and illustrate the application of new sensors and materials in harsh environments. Major hurdles and future outlook for integrated smart AM components will also be presented.
2:30 PM Invited
Versatile Acoustic and Optical Sensing Platforms for Passive Structural System Monitoring: Daniel Homa1; Jaiji He1; Alexander Braatz1; Anbo Wang1; Gary Pickrell1; 1Virginia Tech
Many different technologies are being developed to facilitate and support use of nuclear energy through innovative new platforms. Central to the successful implementation and control of these planned facilities requires development of new sensing technologies. The focus of this work is investigate development of a distributed acoustic fiber Bragg grating (AFBG) based sensing system that will be able to monitor phenomena such as strain, temperature, pressure and material corrosion in real-time to better evaluate the performance of relevant structural components in nuclear facilities.
3:00 PM
Evaluation of Doped-LaCrO3 Ceramics for High Temperature Sensor Applications: Javier Mena1; Kavin Sivaneri Varadharajan Idhaiam1; Gunes Yakaboylu1; Edward Sabolsky1; Katarzyna Sabolsky1; Konstantinos Sierros1; 1West Virginia University
The main objective of this work was to investigate the applicability of the doped-LaCrO3 system for electrical interconnects and sensor applications at temperatures >800°C. Various A- and B-site doping strategies were investigated, and the effect on their electrical conductivity, Seebeck coefficient, and thermal coefficient of expansion were characterized up to 1500ºC. Solid-state, co-precipitation and sol gel methods were used to synthesize the compositions, and the chemical/thermal stability, microstructural evolution, sintering and grain growth kinetics were investigated for these compositions by XRD, SEM and Rietveld methods. The materials showing the greatest promise were included within thick film thermistor and thermocouple sensor designs that were tested to 1500ºC in various gas environments (various pO2 concentrations).
3:30 PM Invited
Processing, Stability, And High Temperature Properties of Transition Metal Silicide-refractory Oxide Composites for Harsh Environment Sensing Applications: Gunes Yakaboylu1; Katarzyna Sabolsky1; Rajalekshmi Chockalingam1; Tugrul Yumak2; Edward Sabolsky1; 1West Virginia University; 2West Virginia University; Sinop University
Many materials used in the current sensing applications suffer from structural and functional issues related to high operating temperatures (up to 1600°C), alternating reducing/oxidizing atmospheres, high pressures, and corrosive environments. Therefore, there is a need for the development of alternative advanced materials, which are capable to operate under high-temperature and harsh-environments for extended hours to provide real-time, accurate sensing during industrial processes such as coal gasification, power generation, and steel/glass manufacturing. This is critical for better process control, improved efficiency, reduced environmental impact, and increased lifetime of the process units. In the present study, electroconductive ceramic composites were fabricated by incorporating 20-90 vol% of transition metal silicides (e.g. MoSi2, NbSi2, CrSi2) within refractory oxides (e.g. Al2O3, ZrO2, Cr2O3), followed by sintering at 1370°-1600°C in argon. Their phase stability, densification, microstructural evolution, oxidation behavior, and electrical properties were extensively investigated in a broad temperature range. Their degradation behavior was further evaluated as a function of the oxide phase type/volume and preoxidation temperature. After optimization of the process and compositions, thick-film ceramic composite thermocouples were fabricated for their thermoelectric performance evaluation