Late News Poster Session: Ceramic and Glass Materials
Program Organizers: MS&T Administration, MS&T PCC
Tuesday 11:00 AM
October 19, 2021
Room: Exhibit Hall B
Location: Greater Columbus Convention Center
Poster
P1-5: Oxidation Protection of AlN/BN via Al18B4O33: Celia Chari1; Katherine Faber1; 1California Institute of Technology
The popularity of boron nitride (BN) as a high-temperature ceramic used in aerospace and automobile applications has heightened the demand to study how its volatile and highly-reactive oxidation product (B2O3) affects the chemical and mechanical properties of ceramic systems. There have been no detailed investigations on the role of B2O3 in systems like AlN-BN, a composite material of interest in aerospace applications. This study explores the oxidation of AlN-BN ceramics and the subsequent changes that occur due to the formation of ceramic aluminum borate whiskers. We investigate the influence of B2O3 on the oxidation kinetics of AlN; the varying microstructure and chemical composition of aluminum borate whiskers grown from 1000 °C to 1300 °C; and the changing mechanical behavior of AlN-BN composites exposed to high-temperature oxidative environments. Ultimately, this study provides insight into the oxidation kinetics of AlN-BN ceramics and suggestions for an expanded role of B2O3 in ceramic composites.
P1-6: Luminescence Thermometry – a Fad or a Challenge?: Malgorzata Sójka1; Marcin Runowski2; Przemysław Woźny2; Luis Carlos3; Eugeniusz Zych1; Stefan Lis2; 1University of Wroclaw; 2Adam Mickiewicz University; 3University of Aveiro
Apart from such applications as modern persistent phosphors or scintillators, novel lighting solutions, and others, luminescence thermometry belongs to the most intensely developing research areas of luminescent materials. Luminescence thermometry offers a continuous real time temperature readout with high spatial resolution, universality of application and tolerance to electromagnetic field or harsh conditions. This opens the pathway for applications in a wide spectrum of fields, from modern machine technologies to sophisticated biomedical imaging. In luminescence thermometry, the required temperature operating range is entirely defined by the application considered. In bio- or medical uses, only a narrow range of physiological temperatures is of interest. On the other hand, aerospace, or surface temperature distribution may easily require measuring temperature over wide ranges, at least several hundred degrees. In this presentation, we will show that luminescence thermometers working in unprecedentedly broad operating range can be effectively constructed.Supported by the National Science Center (#UMO-2020/37/N/ST5/02507)
P1-7: Preparation and Structural Evolution of Si(O)CN Fibers Prepared via Hand Spinning of a Modified Silazane Oligomer: Ellie Christman1; Christel Gervais2; Gurpreet Singh3; Himanshu Jain1; 1Lehigh University; 2Sorbonne University; 3Kansas State University
We study cross-linking and pyrolysis behavior of Si(O)CN ceramic fibers prepared via hand-drawing and polymer pyrolysis of a 1,3,5-trimethyl-1,3,5-trivinyl-cyclotetrasilazane (1- 3- 5 TTCSZ) with polyacrylic acid (PAA) organic polymer as the spinning agent. This type of cyclic silazane oligomer is a precursor for polymer-derived silicon carbonitride or SiCN ceramic. Like other preceramic polymers for SiCN ceramics, 1-3-5-TTCSZ is not fiber spinnable in its pristine form due to either low viscosity, non-meltability after cross-linking, or molecular structure (cyclic rather than linear structure). The addition of PAA to TTCSZ remarkably improved spinnability of the silazane. Investigation of changes to the molecular structure of the precursor and chemical composition of the fibers at various stages of cross-linking and pyrolysis temperature was conducted via Raman spectroscopy, Fourier- Transform InfraRed spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), and Nuclear Magnetic Resonance (NMR) to establish the cross-linking and pyrolysis pathways of the fibers.