Energy Materials 2017: Energy and Environmental Issues in Materials Manufacturing and Processing: Energy and Environmental Issues in Materials Manufacturing and Processing III
Sponsored by: Chinese Society for Metals, TMS: Recycling and Environmental Technologies Committee
Program Organizers: Subodh Das, Phinix,LLC; Zhancheng Guo, University of Science and Technology Beijing; Minfang Han, China University of Mining and Technology, Beijing; Teruhisa Horita, AIST; Elsa Olivetti, Massachusetts Institute of Technology; Xingbo Liu, West Virginia Univ
Wednesday 8:30 AM
March 1, 2017
Location: San Diego Convention Ctr
Enhanced Thermoelectric ZT Constantan Alloy by Cryorolling: Huijun Kang1; Daquan Liu1; Jinling Li1; Tongmin Wang1; 1Dalian University of Technology
Constantan has been widely used as a material for thermocouple because of its thermoelectric performance. Cu56Ni42Mn2 alloys have been prepared by vacuum arc melting (AM) followed by room temperature rolling (RTR) or cryorolling (CR). TEM results show that many deformation nanoscale twins in the form of bundles are detected in CR samples, whereas elongated grains parallel to rolling direction and a few twins can be acquired in RTR sample. RTR and CR can effectively decrease the thermal conductivity due to the barrier scattering by the twin boundaries and keep the high power factor. Finally, high ZT of Cu56Ni42Mn2 alloys can be achieved by cryorolling and introducing a large number of nanoscale deformation twins into microstructure.
Thermoelectric Properties of La-doped SrTiO3 Materials Prepared by Mechanical Alloying: Daquan Liu1; Huijun Kang1; Jinling Li1; Tongmin Wang1; 1Dalian University of Technology
La-doped SrTiO3 were prepared by mechanical alloying with carbon burial sintering, for the purpose of obtaining pure phase and fine materials in one step. The La doping levels were controlled from 0 to 20 mol% by changing experimental conditions. Thermoelectric properties of bulk La-doped SrTiO3 were measured from 300 K to 1100 K. We found that the electronic conductivity of pure sample improved after carbon burial sintering, and the power factor of La-doped samples depended on the La doping level. The high thermal stability of La-doped samples is suitable for high-temperature thermoelectric applications. Unlike other fabrication method, such as solid-state reaction method or sol-gel method, this synthesis method can obtain pure and fine SrTiO3 powders at room temperature without liquid. This approach is simple, cost effective and, more importantly, has great potential for large-scale applications.
9:10 AM Cancelled
Mechanical Analysis of Raceway Formation in Bulk Bed of Blast Furnace: Qiuming Wang1; Yuanxiang Lu1; Zeyi Jiang1; 1University of Science and Technology Beijing
In the iron making process of blast furnace, the size and location of raceway have an important impact on the distribution of gas flow and gas/solid temperature. Based on a one-dimensional cold-state model, the similar geometry model, subarea method and basic force model were employed in this article to derive and accurately calculate the forces of gravity, gas pressure and friction. Combining a three-dimensional cold-state experiment of raceway detection with optical method, a new expression of raceway size with the blast velocity was obtained as well as the modification factor of gas pressure.
Energy Savings in Aluminium Sand Casting Foundries: Hamid Ahmad Mehrabi1; 1Cranfield University
Energy savings in foundries can be direct and indirect. Operational material efficiency, process simulation and foundry management are indirect saving methods by saving materials and increase yield. Preheating the metal and loading, melting, treating and refining molten metal and melt holding are sections that energy saved directly by the process control. Based on these concepts, CRIMSON casting process combines direct and indirect saving methods (2 in 1); thus, achieving energy savings in a more efficient way. The CRIMSON (Constrained Rapid Induction Melting Single Shot Up-Casting) method uses a rapid induction furnace to melt just enough metal for a single mould rather than bulk melting used in traditional processing. This helps improve the quality of casting, increase yield, save energy and reduce emission. The estimated energy savings for aluminum sand casting could be of the order of 43 GJ per tonne (about 12MWh / ton).