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Meeting MS&T23: Materials Science & Technology
Symposium Manufacturing and Processing of Advanced Ceramic Materials
Presentation Title Densification of Dual Phase High Entropy Boride-Carbide Ceramics by Pressureless Sintering
Author(s) William G. Fahrenholtz, Steven M. Smith, Greg Hilmas
On-Site Speaker (Planned) William G. Fahrenholtz
Abstract Scope Dual-phase, high-entropy boride-carbide ceramics were densified by conventional powder processing and pressureless sintering. Powders were synthesized by a two step process consisting of carbothermal reduction of oxides to form the carbide phase, then partical conversion of the carbide to boride by reaction with boron carbide. Relative densities up to ~96% were obtained for ceramics containing about 30 vol% high entropy boride and 70 vol% high entropy carbide. Isostatic pressing at 200 MPa resulted in higher relative densities of both the green bodies and final ceramics compared to uniaxial pressing. The highest relative density of 96.3% was achieved for a ceramic that was isostatically pressed at 200 MPa and sintered at 2300C for 2 hr. Grain sizes of the resulting ceramics were ~2 m. This presentation will discuss the processing and properties of the dual phase boride-carbide ceramics.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Cold Sintering Study of ZnO and Dopants - With a View Towards Varistor Characteristics
Additive Manufacturing of Transparent Optical Ceramics
Basic Research Opportunities from the Army Research Laboratory
Binder Jet Additive Manufacturing for Advanced Ceramics
Ceramic Powder Processing (“Think Like a Particle?” or Perhaps “Think Like a Defect?”)
Densification of Dual Phase High Entropy Boride-Carbide Ceramics by Pressureless Sintering
Design of a Polymer-Metal-Nanoparticle System for Polymer Infiltration and Pyrolysis to Form Ceramic Composites
Design Paradigm for Fabricating MAB Phases
Effect of Binder Phase on TiB2-TiC Based Cermet Materials on the Microstructure and Mechanical Properties
Embedded Printing in Ceramics
Embedded Wire CVD of Silicon Carbide for Homogeneous Joining and SiC-SiC Composite Fabrication
Exploring New Flux Chemistries to Expand the Cold Sintering Process
From Flash Sintering to Ultrafast Sintering without an Electric Field and Electrochemically Controlled Microstructural Evolution
Limitations on the Sintering of Graded Particle Systems
Machine-Learning-Based, Online Estimation of Ceramic’s Microstructure Upon the Laser Spot Brightness During Laser Sintering
Manipulating Instrument Setup Parameters to Increase the Range for Particle Size Measurement
Manufacturing Feasibility of the Cold Sintering Process for Large-scale Ceramic Dielectrics
Measurement of High Temperature Mechanical Property Data for Modeling Applications
Mechanisms of Delamination within Co-extruded Silicon Carbide
Micromechanical Properties and Microstructures of AC and DC Flash-sintered Alumina
Microstructure and Electrical Conductivity of Sol-gel Synthesized and Spark Plasma Sintered Doped-lanthanum Gallate
Nondestructive Materials Characterization Using Ultrasound: Towards a Deeper Understanding of the Cold Sintering Process
Optimizing Ceramic Surfaces for Dust-tolerant Lunar Exploration
Phase and Nanostructure of Polymer Derived Monolithic SiC at Ultrahigh Temperatures
Processing Ceramic Powders in Non-aqueous Mediums - How Polarity of the Suspension Medium Effects Dispersion
Reaction Flash Sintering of Ti0.5Zr0.5N and Ti0.5Al0.5N Ternary Metal Nitrides
Surface Area Reduction During the Sintering of Alumina
Surface Reactivity and Processing Properties of Metal Oxide Nanoparticles for Ceramics
Tailoring Thermal Insulation Ceramic Architectures from Additive Manufacturing
The Influence of Cr on Microstructural Evolution of Alumina
Trends and Opportunities in Manufacturing and Processing of Advanced Ceramic Materials at the National Science Foundation
In Situ Video Monitoring of Zirconium Active Braze Alloy for Joining Al2O3 to Kovar

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