Manufacturing and Processing of Advanced Ceramic Materials: Processing of Carbides, Borides, and Chlorides
Sponsored by: ACerS Manufacturing Division
Program Organizers: Bai Cui, University of Nebraska Lincoln; Mike Alexander, Allied Mineral Products, Inc.; Eric Faierson, Quad City Manufacturing Laboratory - Western Illinois University; James Hemrick, Oak Ridge National Laboratory; Keith DeCarlo, Blasch Precision Ceramics
Thursday 8:00 AM
November 5, 2020
Room: Virtual Meeting Room 16
Location: MS&T Virtual
Session Chair: Surojit Gupta, University of North Dakota; Zhe Cheng, Florida International University
8:00 AM Invited
A Progress Report on the Synthesis and Characterization of MAX and MAB Phases: Surojit Gupta1; 1University of North Dakota
There is an urgent need for materials which can be used for high performance applications like aerospace, triboactive, and biomedical applications. In this presentation, I will present some a review of the recent development in synthesis and characterization of MAX and MAB phases. As a background, MAX and MAB phases belong to a family of ternary/quaternary compounds which are bestowed with unique properties like high mechanical strength, nano-laminated microstructure, tailored hardness, high thermal and electrical conductivity, among others.
8:40 AM Invited
Design, Synthesis and Processing of Novel Ionic Conductors for All-solid-state Batteries: Hailong Chen1; 1Georgia Institute of Technology
All-solid-state batteries (ASSBs) are considered as an alternative to current Li-ion batteries for next generation electrified transportation, owing to their good safety property and higher energy density. Solid electrolyte (SE) is the key component of ASSBs and is the major barrier for the commercialization of this technology. A good SE must possess many essential properties, including high ionic conductivity, low electrolyte conductivity, wide electrochemical window, good mechanical compatibility and low cost, etc. To date, no known electrolyte simultaneously meets all these requirements. Here we report our recent progresses in developing high-performance SEs, including the design, synthesis, in situ structural characterizations and processing of a number of novel solid state ionic conductors. Ultrahigh ionic conductivity of >10 mS/cm was achieved at room temperature. Their structure-property relationship was investigated with multiple complementary characterizations. ASSBs with using these new compounds as electrolyte were successfully fabricated to offer outstanding cycling performances.
9:20 AM Invited
Synthesis and Flash Sintering of (Hf1-xZrx)B2 Solid Solution Fine Powders: Jose Belisario1; Santanu Mondal1; Iman Khakpour1; Alexander Franco1; Andriy Durygin1; Zhe Cheng1; 1Florida International University
Fine powders of (Hf1-xZrx)B2 solid solution were synthesized by two methods. In the first one, solution-based processing of HfCl4, ZrCl4, sucrose and H3BO3 was carried out followed by heat treatment (e.g., at 1500 °C for 1 h) in Argon to achieve the carbothermal reduction (CTR) reaction to form the boride solid solution. In the second one, called boron hydride reduction (BHR) method, HfCl4, ZrCl4 and NaBH4 were directly mixed in a glove box followed by heat treatment in Argon at elevated temperatures from 700 to 1500 °C. In addition, the powders synthesized via both methods were flash sintered without sample preheating in a homemade setup. The synthesized powders as well as the flash sintered bulk ceramics were characterized using different techniques including XRD, SEM, EDS, TEM, TGA-DSC, and Vickers hardness test to reveal the inter-relationships between starting materials composition, processing conditions, and the resulting materials microstructure and physical/chemical properties.
10:00 AM
Thermal Stability and Mechanical Properties of High-entropy Carbide Ceramics with Submicron Grain Size Fabricated by Spark Plasma Sintering: Fei Wang1; Xiang Zhang1; Xueliang Yan1; Yongfeng Lu1; Michael Nastasi1; Yan Chen2; Bai Cui1; 1University of Nebraska Lincoln; 2Oak Ridge National Laboratory
A two-step sintering process was used to fabricate single-phase (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy carbide ceramics (HECC) with a submicron grain size during spark plasma sintering (SPS). HECC samples with grain size ranging from 400 to 600 nm and density range from 86% to 93% were fabricated. The effect of sintering temperature and time on the density, grain size, and mechanical properties of HECC were studied. The fine-grained HECC showed good mechanical properties and high thermal stability. Compared to the coarse-grain HECC with a grain size of 16.5 µm, the bending strength and fracture toughness of fine-grained HECC were 25% and 20% higher, respectively. In addition, the fine-grained HECC showed small grain growth kinetics at 1300 and 1600 ºC.