Advances in Powder and Ceramic Materials Science: Ceramic-based Composite Materials
Sponsored by: TMS Extraction and Processing Division, TMS: Materials Characterization Committee
Program Organizers: Bowen Li, Michigan Technological University; Shefford Baker, Cornell; Huazhang Zhai, Beijing Institute of Technology; Sergio Monteiro, Instituto Militar de Engenharia; Rajiv Soman, Eurofins EAG Materials Science LLC; Faqin Dong, Southwest University of Science and Technology; Jinhong Li, China University of Geosciences; Ruigang Wang, Michigan State University
Tuesday 2:00 PM
February 25, 2020
Room: Theater A-6
Location: San Diego Convention Ctr
Session Chair: Huazhang Zhai, Beijing Institute of Technology; Bowen Li, Michigan Technological University
2:00 PM Introductory Comments
2:05 PM
Microstructural Characteristics and Effective Applications of Andalusite-Mullite Phase Transformation: Bowen Li1; Minsheng He2; Huaguang Wang1; 1Michigan Technological University; 2R&D Center of Wuhan Iron & Steel Co
As a natural mineral containing high aluminum oxide, andalusite has been attracting a great attention for the production of refractory ceramics. When andalusite is transforming into mullite and silica at its decomposing temperature, it generates numerous crystals of mullite directly from a single crystal of andalusite, but with a parallel arrangement of the multiple mullite crystals. This will critically affect the microstructure of mechanical property of the result ceramics. This study discusses the relations of the microstructural characteristics and effective applications of this phase transformation through the decomposing process.
2:25 PM
Investigating Solid Solutions of Tungsten in Molybdenum Aluminium Boride MAB Phase Ceramics, for Use in Extreme Environments: Peter Richardson1; 1University of Newcastle
MAB phases are an emerging family of ternary metal borides exhibiting unique material properties due to their nano-laminated crystal structure. Analogous to the well-known MAX phase ceramics which have shown great promise as materials for extreme environments, MAB phases are composed of a transition metal (M), aluminium (A) and boron (B). While five out of six MAB phase systems have been explored recently, the remaining MAB phase, WAlB, has been mostly neglected due to synthesis difficulties. This work investigates the conditions under which tungsten forms a solid solution with the MoAlB MAB phase, which is isostructural with WAlB and is readily produced by pressureless sintering. Findings from initial experiments on the system (Mo1-xWx)AlB with x = 0–1 will be presented. XRD was used to identify optimal synthesis conditions and quantitative phase analysis performed by Rietveld refinement was critical to the deconvolution of isostructural Mo and W containing phases.
2:45 PM
Microwave Absorption Properties of Polymer-derived SiCN(Fe)/Si3N4 Ceramics: Xiao Lin1; Hongyu Gong1; Yujun Zhang1; Jianqiang Bi1; Yurun Feng1; Shan Wang1; 1Shandong University, China
Iron-doped SiCN/Si3N4 ceramics were synthesized by dipping-pyrolysis polysilazane with iron(III) acetylacetonate and use porous silicon nitride as matrix. The polysilazane pyrolyzed a certain amount of free carbon and silicon nitride at the high temperature. The content of iron increased with the increase of the amount of iron(III) acetylacetonate addition. When the sample was added with 5wt.% iron(III) acetylacetone, the ε' reached the lowest value of 1 at 15.4 GHz, the highest peak value of the tan ε was 3.09 at 15.2 GHz, and the R of the sample was lower than -20 dB at 15.5 GHz, which implied that it has great wave absorption performance in the high frequency region and could absorb more than 99% of the incident electromagnetic waves. The uniform distribution of C, β-SiC and α-Fe in the samples is helpful to improve the wave absorption properties of the materials.
3:05 PM
High-temperature Microwave Dielectric Properties of Boron Nitride Polycrystalline Ceramics without additives: Huazhang Zhai1; 1Beijing Institute of Technology
Boron nitride (BN) polycrystalline ceramics with high density were prepared without any other sintering additives. Boron nitride powders were modified by the high-energy ball-milling, making crystalline transition from hexagonal to turbostratic style partly and improve the sintering activity greatly. The dielectric properties, such as permittivity and loss tangent, are measured from very low frequency to very high frequency in details. Especially, the dielectric properties in microwave frequency range (1-18 GHz) were measured from room temperature up to 800 Celsius degree by and the stripline resonantor method and high Q resonance cavity method, and gain many important dielectric data in high temperature. The permittivity is about 4.3 and the dielectric loss is about 10-4 to 10-3 order of magnitude in the microwave frequency range from 7GHz to 18GHz and under 800 degree. The properties with Bending strength, fracture toughness and ablation were also measured for application, and prove very well.
3:25 PM Break
3:40 PM
Evaluation of a Three-chamber Algae-cathode Microbial Fuel Cell for Bioelectrochemical Recovery of Energy and Lead Metal: Yinta Li1; Ling Xia2; Shaoxian Song2; 1Hubei Key Laboratory of Mineral Resources Processing and Environment; Wuhan University of Technology; Universidad Autonoma de San Luis Potosi; Weihai Ocean Vocational College; 2Hubei Key Laboratory of Mineral Resources Processing and Environment; Wuhan University of Technology
This study develops a three-chamber photosynthetic algae microbial fuel cell (TCAC-MFC) engaged Chlorella sp. as cathode to generate O2 and produce alkalinity for simultaneously Pb(II) precipitation in the cathode chamber and power generation for the developed system. The performance of the system was evaluated by optimizing the biocathode and operation factors including initial pH and DO concentration. The optimum bio-cathode of TCAC-MFC was found using algae pre-cultured in high phosphorus medium, with initial pH of 8.33 and DO of 7 mg L-1. The maximum power density of 835 mW m−2 was achieved. The long-term run of Pb(II) removal and electricity generation under the optimum cathode was further conducted and achieved a stable Pb removal of around 100% and the maximum power density of around 804 mW m−2. The stable nontoxic Pb(OH)2, PbO, PbCO3 and (PbCO3)2Pb(OH)2 are the main component after Pb(II).
4:00 PM Cancelled
Mechanical Properties of Boron Nitride Nanosheets（BNNSs） Reinforced Si3N4 Composites: Guandong Liang1; Jianqiang Bi1; Guoxun Sun1; Yafei Chen1; Weili Wang1; 1Shandong University
The boron nitride nanosheets(BNNSs)/silicon nitride(Si3N4) composite ceramics was prepared by SPS sintering. BNNSs with few layers and transverse size in micron-scale were prepared by ball-milling and ultrasound-assisted liquid phase stripping. In this study, it was found that the BNNSs prepared by these two methods could enhance the mechanical properties of silicon nitride ceramics, and that the bending strength of BNNSs/ Si3N4 composite ceramics can be enhanced better by ultrasound-assisted liquid phase stripping method when the same mass fraction of boron nitride nanosheets is added. The bending strength and fracture toughness of BNNSs/Si3N4 composite ceramics were increased by 36% and 51%, respectively, when BNNSs prepared by ball milling method of 2wt% were added. The pullout of BNNSs, the bridging of cracks, and the deflection of cracks are the main factors of improving the toughness.