Advances in Powder and Ceramic Materials Science: Structure Design and Processing
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
Monday 8:00 AM
February 24, 2020
Room: Theater A-6
Location: San Diego Convention Ctr
Session Chair: Jinhong Li, China University of Geosciences (Beijing); Rajiv Soman, Eurofins EAG Materials Science, LLC
8:00 AM Introductory Comments
8:05 AM Cancelled
Progress on Porous Ceramics for Heat-insulation: Chang-An Wang1; 1Tsinghua University
With the development of aerospace industry, higher requirements, e.g. lightweight, high temperature resistance, high strength and low thermal conductivity, have been put forward for heat insulation materials for high temperature parts. The properties of porous ceramics depend on the characteristics of the composition and structure including porosity, pore configuration, pore size and distribution. In this presentation, some progress on porous ceramics for heat-insulation in my group will be reported. Some novel processing techniques, including modified gelcasting, freeze-casting, fiber reinforcing, aerogel impregnation, hollow-grained processing and so on, have been developed to design and control the specific porous structure, therefore, some specific properties including ultra-high porosity, ultra-lightweight, high strength, and low thermal conductivity have be achieved for some potential heat-insulation applications. The matching relationship between strength and thermal conductivity will also be discussed.
8:25 AM
Structure, Chemistry, Optical and Dielectric Properties of a New Pyrophosphate: LiGaP2O7: Mallesham Bandi1; Ron Broner2; Samuel Arredondo1; Ramana Chintalapalle1; 1University of Texas at El Paso; 2University of California, Santa Barbara
Phosphate based materials are extensively studied in recent years due to their fascinating physical properties and potential technological applications including; solid state lasers, electrochemical energy devices, catalysis, luminescence. In this work, we report on the structural, optical and dielectric properties of a novel material, LiGaP2O7, synthesized using conventional solid-state chemical reaction. Calcination of sample was carried at different temperatures with intermediate grinding. X-ray diffraction of calcined sample confirms that sample calcined at 650 °C for 8 h exhibits phase purity without any secondary phases. The physical, chemical and electronic property analyses made and results obtained are compared with well-studied LiFeP2O7, which is an excellent candidate for lithium ion batteries. Finally, we made an attempt to establish a correlation between crystal structure, phase, microstructure, optical and electrical properties of LiGaP2O7.
8:45 AM
Application of Inorganic Adsorbents for Radwaste Water Treatment: Hsien-Ming Hsiao1; Yun-Chung Shen1; Yi-Kuo Chang1; Hsien-Te Hsieh1; Hong-Ping Lin1; 1Institute of Nuclear Energy Research
Practical applications of inorganic adsorbents for on-site radioactive waste water treatment were investigated. Two kinds of radwaste water, Mo-99 and waste ethylene glycol, were treated to remove radionuclides at INER by adsorption via commercial and customized adsorbents. Treatment facilities, procedures and capacities of adsorbents are described and discussed. Two inorganic adsorbents, Cs-Treat and Sr-Treat, were commercially obtained for Cs-137 and Sr-90 removal in the Mo-99 waste water treatment. Self-designed AC-Sr, commercial DT-30 and NRW160 were applied for waste ethylene glycol treatment via filled adsorbent columns. Capacities of commercial and customized adsorbents for various radionuclides were investigated to compare the performance of INER-developed adsorbents with commercial ones for future application.
9:05 AM
Role of Anisometric Particles in Microstructure Evolution, Structural Stability and Compressive Mechanical Properties in Ice-templated Ceramics with Directional Porosity: Dipankar Ghosh1; Mahesh Banda1; 1Old Dominion University
Ice-templated ceramics exhibit macroscopic structural anisotropy, but at microstructural length-scale contain equiaxed grains within the lamella walls and lamellar bridges. We have shown that variations of particle size and particle morphology along with unidirectional solidification kinetics can result in unprecedented modifications of the length-scale features in ice-templated ceramics and marked changes in compressive mechanical properties. However, there is a need to thoroughly understand the interactions of fine-grained ceramic matrix and anisotropic particles and microstructure evolution and structural stability during high-temperature sintering. In this work, we aim to understand the progressive interactions of fine-grained alumina ceramic matrix and alumina platelets and microstructural modifications within the lamella walls of ice-templated porous ceramics during sintering. Moreover, our aim is to connect the local structural modifications to the macroscopic mechanical response and identify the parameters that are critical to tailor the macroscopic properties. The results will further advance the structure-property relationships in ice-templated ceramics.
9:25 AM Break
9:40 AM Cancelled
Sintering Process and Characteristics of Glass-Ceramics from Coal Fly Ash: Hongjuan Sun1; Li Zeng1; 1Southwest University of Science and Technology
In this study, glass-ceramics was prepared with coal fly ash by direct sintering to solve the problem of resource utilization of coal fly ash. The effects of the sintering temperature on volume density, water absorption, open and closed porosity from 1000 to 1200°C were investigated. The sintering process of glass–ceramics was also investigated by XRD and SEM. The data indicated that the sintering process was accomplished by dissolving the solid amorphous phases, hematite and portion quartz of coal fly ash to form anorthite. During the process, the open porosity of the material gradually tended to closure. The glass–ceramics fired at 1180°C for 30 min featured good strengths, with compressive strength of 122 MP and bending strength of 34 MP. The obtained relatively low density of 1.94 g cm-3 and moderate water absorption of about 1% would make these materials suitable for lightweight construction tiles. Besides, owing to the abundance of coal fly ash produced from thermal power plants, the present technology should be suitable for large-scale manufacturing of glass-ceramics, with economic benefits and possible solution to environmental and wastes disposal concerns.
10:00 AM Cancelled
Preparation of Abrasion & Erosion-resistant Ceramic Coating on Copper by Slurry Method: Zefei Zhang1; Hao Bai1; Ning Li1; Jian Zhang1; Huanmei Yuan1; 1University of Science and Technology Beijing
Copper is usually applied in severe environments such as extreme temperature, wear or corrosive conditions which seriously affect the service life of copper equipment. In this study, a ceramic coating was prepared by slurry method. The slurry which was coated on the bond layer of NiCoCrAlY was blended by aggregates of SiO2, Al2O3 and ZrO2 and binder of sodium silicate. The ceramic top coating was formed through sintering at 600℃. The results show that the ZrSiO4 and Al2Si3O9 which play a key role in improving the properties are formed as the main phases in the ceramic coating. Furthermore, the bonding strength was tested to be 10.29 MPa and the wear rate reached 3.040×10-5 mm3/(m•N). After the test of 50 thermal cycles, the ceramic coating kept good condition. Thus, the coating prepared shows potential for copper protection in harsh environments.