"Boron carbide is a superhard and lightweight ceramic material. As a result of these characteristics, it used as a protective component in bulletproof vests, tank armour and also has many other industrial applications (e.g., tooling, abrasives). Researchon boron carbide remains active given a long-standing challenge to understand its complex failure behavior in extreme environments owing to its unique microstructure and mechanical properties, where many current efforts are underway to improve its behavior through microstructure alteration via additives that form secondary phases, chemical doping, and altering the chemical composition of the boron-to-carbon ratio in the crystal structure. This book covers some of the key challenges involving boron carbide that are currently being studied by many materials scientists and ceramists. The authors who are active in this research field have prepared the chapters for this book and specific topics covered highlight the state-of-the art research in structure, processing, properties and applications. The organization of the book is designed to provide an easy understanding for students and professionals interested in advanced material for novel applications"--
Author(s): Kolan Madhav Reddy
Series: Materials Science and Technologies
Publisher: Nova Science Publishers
Year: 2020
Language: English
Pages: 322
City: New York
Contents
Preface
Chapter 1
Atomic Structure of Boron Carbide
Abstract
1. Introduction
2. Experimental Details
3. Results and Discussion
3.1. Atomic Structure of Boron Carbide
3.2. Linear Chain Polytypes in Boron Carbide
3.2.1. C-B-C Polytype
3.2.2. C-V-C Polytype
3.2.3. C-C-C Polytype
Conclusion
Future Directions
Acknowledgments
References
Chapter 2
Structure and Bonding in Electron-Precise Boron Carbides: To Disorder or Not to Disorder!
Abstract
Introduction
All Boron Carbides Are Not Made Equal!
To Disorder or Not to Disorder!
Other Notable Works
The Scientific Variance!
The Validity of This Claim!
Defects/Disorders – Single Crystal/Amorphization (i.e., Structural Disorder) Studies
Defects/Disorders – Pressure and Temperature Effects
Temperature Effects
Pressure Effects
Temperature and Pressure Effects
Some Insights and Thoughts
Conclusion
Acknowledgments
References
Chapter 3
Boron Carbide Nanostructures:
Structural, Mechanical and Thermal Properties
Abstract
1. Introduction
2. Methods
2.1. Experimental Studies
2.2. Theoretical Studies
3. Structures
3.1. 0D Structures
3.2. 1D Structures
3.3. 2D Structures
Summary and Conclusion
Future Prospective
References
Chapter 4
Dynamic Fracture and Fragmentation of Boron Carbide
Abstract
1. Introduction
2. Studying the Fracture and Fragmentation of Boron Carbide Using Mechanical and Impact Testing
2.1. The Split-Hopkinson Pressure Bar System
2.1.1. The Dynamic Uniaxial and Confined Compression Testing Using SHPB
2.1.2. The Dynamic Indentation Testing – A Modified SHPB System
2.2. Shock Experiments
2.2.1. Plate Impact Experiments
2.2.2. Laser Shock Experiments
2.2.3. Ballistic Impact and Long Rod Penetration Experiments
2.3. Other Experimental Techniques That Probe the Fracture and Fragmentation Behavior of Boron Carbide
2.3.1. Mechanical Testing on Pre-Damaged Boron Carbide
2.3.2. Compaction on Granular Boron Carbide
2.3.3. Diamond Anvil Cell (DAC) Experiment
2.4. Section Remarks
3. Modeling Fracture and Fragmentation of Brittle Ceramics and Boron Carbide
3.1. Micro-Mechanical Modeling of Brittle Ceramics
3.1.1. Modeling Micro-Crack Behavior in Brittle Ceramics
3.1.2. Modeling Plasticity and Amorphization in Brittle Ceramics
3.2. Modeling Impact/Shock Behavior of Brittle Ceramics and Boron Carbide
3.2.1. The Johnson-Holmquist (JH) Models and Their Extension
3.2.2. The Hydrodynamic Theory and the Walker-Anderson Model
3.2.3. The Expanding Cavity Model
3.3. Modeling the Fragmentation Behavior of Brittle Ceramics and Boron Carbide
3.3.1. Geometric Statistics-Based Fragmentation Models – End-State Models
3.3.2. Energy Balance-Based Fragmentation Models – End-State Models
3.3.3. Cohesive Failure Model – Process-Driven Computational Models
4. Future Directions
Conclusion
References
Chapter 5
Mechanical Properties and Deformation Mechanism in Nanocrystalline Boron Carbide
Abstract
1. Introduction
2. Methods
2.1. Pressureless Sintering of B4C
2.1.1. Effect of Sintering Additives in B4Cs
2.1.2. Effect of Inherent Impurties in B4Cs
2.2. Pressure-Assisted Sintering of B4C
3. Mechanical Properties of B4C
4. Nanocrystalline Compared to Conventional Polycrystals
5. Deformation Behavior of Nanocrystalline b4c
Conclusion
Future Prospective
Acknowledgments
References
Chapter 6
Sliding Wear Properties of Boron Carbide Ceramics
Abstract
1. Introduction
2. Sliding Wear of B4C Based Composites
2.1. Effect of Material Properties
2.2. Effect of Tribological Parameters
2.3. Effect of Environmental Conditions
Conclusion
Future Prospective
References
Chapter 7
High Temperature Wear Behavior of Aluminum-Boron Carbide-Graphite Composites
Abstract
1. Introduction
2. Methods
2.1. Manufacturing
2.1.1. Composite Preparation
2.1.2. Experimental Details
2.1.3. Sample Fixing in the Holder
3. Results and Discussions
3.1. Effcet of Temperature on Wear Loss
3.1.1. Wear Test at 250C
3.1.2. Wear Test at 500C
3.1.3. Wear Test at 1000C
Conclusion
Scope for Future Work
Acknowledgments
References
About the Editor
List of Contributors
Index
Blank Page
