Complex shaped boron carbides from negative additive manufacturing

Lu, Ryan; Chandrasekaran, Swetha; Frane, Wyatt L. Du; Landingham, R.L.; Worsley, Marcus A.; Kuntz, Joshua D.

doi:10.1016/j.matdes.2018.03.026

Cited by 33 publications

(10 citation statements)

References 36 publications

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“…This issue could be solved by selecting 3D printing technologies [5,6], representing advantageous tools for the production of reproducible and controlled structures. 3D printed sacrificial molds or sacrificial mold-assisted techniques have been widely used for manufacturing microfluidic channels, polymeric scaffolds, inorganic 3D matrix materials, and microneedles [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Sacrificial mold-assisted 3D printing of stable biocompatible gelatin scaffolds

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Sacrificial mold-assisted 3D printing of stable biocompatible gelatin scaffolds

et al. 2021

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“…particles or whiskers with even small volume fractions greatlyimprove the strength and stiffness of the composites [10].Among various reinforcements used with magnesium, boron carbide (B 4 C) is the best because of its low density combined with high hardness, fracture toughness, superior elastic modulus and tremendous wear resistance [11,12]. Because of its better properties, it has extensive applications in nuclear, automobile and aerospace sectors and high skilled applications such as light weight shields, fast-breeders, abrasivegrit, and nozzles, cutting and grinding tools and so on [13][14][15].The popularity of magnesium matrix composites in day-to-day life is delayed because of the cost, which mainly involves the cost of reinforcement particles and the method of fabrication [16]. Hence the potential of magnesium matrix composites with wide variety of reinforcing materials in advanced functional and structural materials needs attention in processing techniques and their features in order to select the suitablefabricationtechnique for that particular composite material.…”

mentioning

confidence: 99%

“…Among various reinforcements used with magnesium, boron carbide (B 4 C) is the best because of its low density combined with high hardness, fracture toughness, superior elastic modulus and tremendous wear resistance [11,12]. Because of its better properties, it has extensive applications in nuclear, automobile and aerospace sectors and high skilled applications such as light weight shields, fast-breeders, abrasivegrit, and nozzles, cutting and grinding tools and so on [13][14][15].…”

mentioning

confidence: 99%

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

Rajkumar¹,

Kailasanathan²,

Senthilkumar³

et al. 2020

Mater. Res. Express

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In the present investigation, Magnesium composites have been fabricated with boron carbide (B 4 C) as reinforcement by powder metallurgicaltechnique. Two different particle sizes-micro and nano B 4 C particles with weight percentage of 0%, 5% and 10% has been studied. The green compacts were prepared by cold pressing and then sintering the specimens before being subjected to cold upsetting under triaxial stress state condition in order to study the phenomenon of workability and instantaneous strain hardening index. Powder characterizations are discussed using x-ray Diffraction peaks, Scanning Electron Microscope images and Energy Dispersive Spectrum analysis. Cold upsetting has been preferred to investigate the performance of the composites. The values of formability stress index factor (β σ ), various stress ratio (σ θ /σ eff , σ m /σ eff andσ z /σ m ) parameters and instantaneous strain hardening index (n i ) are observed for increase in % of B 4 C particles and its sizes. The experimental results were analyzed pertaining to relative density. The results reveal that Mg-10% nano B 4 C composite has higher relative density, formability stress index factor and hence high workability than the other composites. The addition of B 4 C particles as reinforcement affects the strain hardening index due to geometric and work hardening of the composites. particles or whiskers with even small volume fractions greatlyimprove the strength and stiffness of the composites [10].Among various reinforcements used with magnesium, boron carbide (B 4 C) is the best because of its low density combined with high hardness, fracture toughness, superior elastic modulus and tremendous wear resistance [11,12]. Because of its better properties, it has extensive applications in nuclear, automobile and aerospace sectors and high skilled applications such as light weight shields, fast-breeders, abrasivegrit, and nozzles, cutting and grinding tools and so on [13][14][15].The popularity of magnesium matrix composites in day-to-day life is delayed because of the cost, which mainly involves the cost of reinforcement particles and the method of fabrication [16]. Hence the potential of magnesium matrix composites with wide variety of reinforcing materials in advanced functional and structural materials needs attention in processing techniques and their features in order to select the suitablefabricationtechnique for that particular composite material. To fabricate magnesium matrix composites, three well-known processing techniques namely Powder Metallurgy (P/M), squeeze casting and stir casting are available [17]. The P/M technique is attractive among others because particlesreinforcedwere evenly distributedin the matrix thereby regulating the microstructure and improving the structural and mechanical properties [18].Al-SiC composites subjected to mechanical, machinability and metallurgical studies reveals that reducing the size of the particle reinforcement increases the life in low cycle fatigue because of cyclic hardening [19]. Relative density of...

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“…Recently, there have been several projects conducted using additive manufacturing to generate complex structures from boron carbides. For example, one study involves gelcasting high density B 4 C/C into 3D-printed molds (Lu et al 2018).…”

Section: Journal Of Young Investigators Reviewmentioning

confidence: 99%

Advanced Manufacturing and Instrumentation for Neutron Chopper Design

Lu¹,

Sabharwall²,

Heidrich³

et al. 2020

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This review focuses on neutron choppers that deploy highspeed rotation (up to 500 Hz) and generate substantial heat and stress. After over 80 years of research and development, this instrumentation has reached a state of optimization, and engineers expect new research channels to overcome the historical limitations of only making incremental improvements (Crawford 2000). This study explores advanced manufacturing for neutron chopper design. Advanced manufacturing is to improve products and processes with the rapid transfer of modern techniques enabled by Information Communication Technology (PCAST 2010). The work aims to select neutron-absorbing material and designing chopperblade structure with phase changing fluid to effectively filter neutron beams and reduce heat generated by chopper rotation. The remainder of this review highlights methods used for this survey, evaluates selected studies in four categories, and discusses conclusions. The first category of the selected studies on neutron chopper development shows a trend in modern design methods with computing. The second traces the origin of advanced manufacturing as an emerging technology to improve neutron chopper design. The third and fourth categories focus on the two key themes: effective cooling and stable structuring, respectively. Overall, this work provides energy researchers with a new means for generating pulsed uniform-energy neutron beams. It also attracts an undergraduate audience in diverse disciplines to pursue nuclear engineering. METHODS Literature reviews examine scholarly works on a topic using different methods. Meta-analysis, popular among health sci

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Complex shaped boron carbides from negative additive manufacturing

Cited by 33 publications

References 36 publications

Sacrificial mold-assisted 3D printing of stable biocompatible gelatin scaffolds

Sacrificial mold-assisted 3D printing of stable biocompatible gelatin scaffolds

Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique

Advanced Manufacturing and Instrumentation for Neutron Chopper Design

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Complex shaped boron carbides from negative additive manufacturing

Cited by 33 publications

References 36 publications

Sacrificial mold-assisted 3D printing of stable biocompatible gelatin scaffolds

Sacrificial mold-assisted 3D printing of stable biocompatible gelatin scaffolds

Study on formability and strain hardening index: influence of particle size of boron carbide (B4C) in magnesium matrix composites fabricated by powder metallurgy technique

Advanced Manufacturing and Instrumentation for Neutron Chopper Design

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Study on formability and strain hardening index: influence of particle size of boron carbide (B₄C) in magnesium matrix composites fabricated by powder metallurgy technique