The formation of smooth, defect-free, stoichiometric silicon carbide films from a polymeric precursor

Pitcher, Michael
Bianconi, Patricia
Silicon carbide (SiC) materials, which are used in a variety of applications, are often produced using powder processing, sintering or bulk crystal growing techniques. The formation of silicon carbide films or shaped products, via these methods, is often extremely difficult and/or requires high temperatures. Here we report the synthesis and characterization of a polymeric precursor, Polymethylsilyne (PMSy), and it subsequent conversion to beta-SiC. The polymer is simple to synthesize and is easily manipulated in air. The ceramic produced from PMSy is extremely pure, stoichiometric SiC and is produced in high yields (up to 85%). The ceramic films that can be produced from PMSy on a variety of substrates, from ceramics to metals, are again stoichiometric SiC and are smooth, continuous and defect free; possibly enabling the use of these films in electronic applications.


Improving the ductility of polylactic acid parts produced by fused deposition modeling through polyhydroxyalkanoate additions
Kaygusuz, Burçin; Özerinç, Sezer (2019-11-01)
Polylactic acid (PLA) is one of the most commonly used materials for fused deposition modeling (FDM) due to its low cost, biocompatibility, and desirable printing characteristics. However, its low ductility is a major disadvantage for engineering applications where high damage tolerance is needed. This study investigates the feasibility of polyhydroxyalkanoate (PHA) additions to PLA for improving the ductility of parts produced by FDM. Thermal and mechanical behavior of PLA/PHA specimens containing 12 wt % ...
The Use of Terahertz Spectroscopy as a Sensitive Probe in Discriminating the Electronic Properties of Structurally Similar Multi-Walled Carbon Nanotubes
Parrott, Edward P. J.; Zeitler, J. Axel; McGregor, James; Oei, Shu-Pei; Ünalan, Hüsnü Emrah; Milne, William I.; Tessonnier, Jean-Philippe; Su, Dong Sheng; Schloegl, Robert; Gladden, Lynn F. (2009-10-19)
Terahertz: spectroscopy is used to definitively distinguish between two multi-walled carbon nanotubes (see figure), which have commercial applications in a number of advanced materials. Other techniques do not provide a sensitive discrimination of the measured properties. This observation is rationalized by considering the dielectric nature of the materials and the relationship of this to their structural differences.
Bahtiyar, Doruk; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2022-9)
For many years, materials in the form of metal sulfides, oxides, phosphates, and titanates have been developed as cathode and anode active materials to be used in energy storage devices. Borides and borates, recently, attracted the attention of researchers in this field. In this study, for the development of a new class of materials for energy storage applications, synthesis and characterization of metal (Fe, Mo, Mn, and V) borides and (Mn, and Y)borates were carried out. The obtained materials were tested ...
Analysis of velocity profiles in concentrated solid-liquid mixtures using ultrasound doppler velocimetry
Taşkın, Ahmet Fırat; Ayrancı Tansık, İnci; Uludağ, Yusuf; Department of Chemical Engineering (2021-7)
Stirred tanks are widely used for a variety of processes in industry such as solid dispersion, crystallization and dissolution processes. Several parameters are used to optimize these stirred tank processes such as impeller type, tank geometry and impeller speed. The flow field in the stirred tank is complex and varies depending on these parameters. In these processes diffusion and chemical reaction rate depend on the flow field and velocity fluctuations; therefore, information about the flow field is valua...
Preparation of epoxy-based composites containing barium metaborate and their characterization
Yürekli, Elif; Bayram, Göknur; Department of Chemical Engineering (2014)
Epoxy resin is one of the most important thermosetting polymers, widely used in various fields of industry. However, like most of the polymeric materials, epoxy resins are flammable and this restricts their application areas. The purpose of this thesis is to increase flame retardant property of epoxy-based composites using various flame retardant additives mainly including barium metaborate. This thesis consists of three main parts. In the first part, preliminary composites, which containing barium metabora...
Citation Formats
M. Pitcher and P. Bianconi, “The formation of smooth, defect-free, stoichiometric silicon carbide films from a polymeric precursor,” 2006, vol. 911, p. 295, Accessed: 00, 2020. [Online]. Available: