A5103000841- Boron and Carbon Nanomaterials Research
- Advanced ceramic materials synthesis
- Diamond and Carbon-based Materials Research
- Advanced materials and composites
- Metal and Thin Film Mechanics
- MXene and MAX Phase Materials
- Aluminum Alloys Composites Properties
- Additive Manufacturing and 3D Printing Technologies
- Granular flow and fluidized beds
- Graphene research and applications
- Ion-surface interactions and analysis
- High-Velocity Impact and Material Behavior
- Rheology and Fluid Dynamics Studies
- Materials Engineering and Processing
- Ultrasonics and Acoustic Wave Propagation
- Innovations in Concrete and Construction Materials
- Photopolymerization techniques and applications
- High-pressure geophysics and materials
- Polymer Nanocomposites and Properties
- Advanced Materials Characterization Techniques
- Advanced Surface Polishing Techniques
- Injection Molding Process and Properties
- Powder Metallurgy Techniques and Materials
- Minerals Flotation and Separation Techniques
- Transportation Planning and Optimization
Rutgers, The State University of New Jersey
2016-2025
Material Sciences (United States)
2019
Materials Science & Engineering
1996-2014
University of Michigan
2001
American Ceramic Society
1994-1995
Boron carbide is characterized by a unique combination of properties that make it material choice for wide range engineering applications. used in refractory applications due to its high melting point and thermal stability; as abrasive powders coatings extreme abrasion resistance; excels ballistic performance hardness low density; commonly nuclear neutron radiation absorbent. In addition, boron temperature semiconductor can potentially be novel electronic This paper provides comprehensive...
The theoretical strength of a material is the minimum stress to deform or fracture perfect single crystal that has no defects. This considered as an upper bound on attainable for real crystal. In contradiction this expectation, we use quantum mechanics (QM) simulations show boron carbide (B4C) hard ceramic, shear can be exceeded by 11% imposing nanoscale twins. We also predict from QM indentation nanotwinned B4C 12% higher than Further, validate effect experimentally, showing samples are...
Recent observations of planar defects in boron carbide have been shown to deviate from perfect mirror symmetry and are referred as "asymmetric twins." Here, we demonstrate that these asymmetric twins really phase boundaries form stoichiometric B(4)C (i.e., B(12)C(3)) but not B(13)C(2). TEM ab initio simulations coupled show result an interplay stoichiometry, atomic positioning, icosahedral twinning, structural hierarchy. The composition icosahedra is B(11)C translation the carbon atom a...
Abstract The kinetics of polymers pyrolysis, particularly those containing ethoxylated trimethylolpropane triacrylate ((EtO) 3 ‐TMTPA), is utmost importance in optimizing the binder removal process that associated with ceramic vat photopolymerization (CerVPP). Here, we focus on decomposition a simplified resin, which photopolymer system formulated from (EtO) ‐TMTPA and photoinitiator (diphenyl(2,4,6‐trimethylbenzoyl) phosphine oxide). thermal behavior resin was critically assessed use...
Abstract Material properties directly affect the final performance of produced articles. This study aims to establish a correlation between materials and hardness boron carbide samples. Ten different powders were sintered high densities by spark plasma sintering, material (grain size, density, stoichiometry, free carbon) analyzed. Hardness tests conducted on these All experimental procedures completed single operator, same instruments used for all Multiple linear regressions using ordinary...
Detailed microstructural characterization was carried out on a commercial‐grade hot‐pressed boron carbide armor plate. The grains have close to B 4 C stoichiometry, and most of them no planar defects. prominent second phase is intergranular graphite inclusions that are surrounded by multiple grains. Submicrometer intragranular BN AlN precipitates were also observed. In addition, fine dispersions nanoprecipitates observed in some but not all No films found. These characteristics compared with...
Si-doped boron carbide could be a promising material for the next-generation body armor.
Uniform densification of relatively thick (~7 mm) consolidated boron carbide plates at low temperatures (e.g. 1800°C) and facture toughness are two the primary challenges for further development applications. This work reports that these can be overcome simultaneously by adding 5 wt% alumina as a sintering aid. Nearly fully dense (97%), fine grained (B 4 C) samples were produced using spark plasma 1700°C above in B C‐5 Al 2 O 3 system. The matrix reacted to form an 6 BO (a mullite‐like...
Abstract Stereolithography of ceramics remains one the most powerful additive manufacturing routes for creation intricate ceramic parts. Despite its utility as a forming tool, stereolithography requires challenging debinding stage due to requisite high polymeric loading. Earlier research has identified both resin composition and atmosphere be crucial factors in improving performance. Here, we use combination thermogravimetric analysis neutron imaging examine samples different compositions...
Abstract Boron carbide is a notable ceramic, with its high hardness and low density. However, it suffers sudden loss in strength under shear stress. Doping boron Si/B widely used to increase resistance amorphization. High purity silicon hexaboride precursor powders are for doping carbide, but these materials have costs supply chain constraints. This research investigated the effect of substituting lower B or using pure Si powder instead SiB 6 on materials’ properties such as elastic...
The effect of particle packing on the rheology and casting behavior cast cake characteristics aqueous alumina suspensions (5O vol%) was investigated using Andreasen approach. Varied produced by blending two starting materials that differed in average size a factor 10. Formulations closest to ideal lowered viscosity. Specifically, lowest viscosity suspension, 196 mPa s, with distribution distribution. Typically, well‐dispersed suspension (characterized low viscosity) casts slower than one...
As the size of individual particles is reduced below several microns, interparticle cohesive forces begin to play a major role in bulk powder behavior.Fine powders generally exhibit poor flowability as well an affinity agglomerate and form clusters due this cohesion.This clustering behavior dry, binderless known auto-granulation can often cause difficulties processing handling powders.In study, titania vibrated under controlled conditions induce promote growth.The amplitude frequency...
Boron carbide is an extremely hard and lightweight material used in armor systems. Upon impact above the Hugoniot elastic limit (HEL), boron loses strength suddenly fails. Atomistic models suggest that boron-rich carbides could mitigate amorphization. Such samples were processed, indentation-induced amorphous zones created throughout of varying degrees mapped with Raman spectroscopy to assess changes amorphization intensity. Boron-rich a B/C ratio 6.3 showed large reduction intensity...