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About the Authors xiii Foreword by Dr. Sanak Mishra xvii Foreword by Prof. Koji Kato xviii Preface xix Section I Fundamentals of Ceramics: Processing and Properties 1 1 Introduction: Ceramics and Tribology 3 1.1 Introduction 3 1.2 Classification of Engineering Materials 6 1.3 Engineering Ceramics 8 1.4 Structural Ceramics: Typical Properties and Tribological Applications 9 1.5 Structure of the Book 14 1.6 Closure 17 References 17 2 Processing of Bulk Ceramics and Coatings 21 2.1 Introduction 21 2.2 Conventional Processing of Ceramics 21 2.2.1 Sintering Mechanism 22 2.2.2 Conventional Processing of Ceramics 24 2.2.2.1 Powder Processing and Compaction 24 2.2.2.2 Pressureless Sintering 27 2.2.3 Advanced Processing of Ceramics 28 2.2.3.1 Hot Pressing 28 2.2.3.2 Microwave Sintering 28 2.2.3.3 Spark Plasma Sintering 29 2.3 Thermal Spray-Based Coating Deposition 30 2.3.1 Basics of Thermal Spray Deposition 33 2.3.1.1 Plasma Spray Deposition 33 2.3.1.2 Flame Spray Deposition 34 2.3.1.3 Wire Arc Spray Deposition 35 2.3.1.4 High-Velocity Oxy-Fuel Spray Deposition 36 2.3.1.5 Detonation Spray Coating 36 2.3.2 Bond Strength of Thermal Spray Coatings 39 2.3.2.1 Bond Mechanism 39 2.3.2.2 Test Methods 40 2.3.3 Coating Structure 42 2.3.3.1 Particle and Substrate Material Properties 42 2.3.3.2 Particle Temperature and Velocity 42 2.3.4 Case Study: WC-Co Coatings 42 2.4 Closure 49 References 49 3 Conventional and Advanced Machining Processes 53 3.1 Introduction 53 3.2 Conventional Machining 54 3.3 Advanced Machining Processes 57 3.3.1 Electro-Discharge Machining 57 3.3.1.1 Working Principle 59 3.3.1.2 EDM Process Variables 61 3.3.1.3 EDM Parameters 62 3.3.1.4 Surface Analysis 63 3.3.1.5 EDM of Ceramic-Based Composites 64 3.4 Closure 66 References 66 4 Mechanical Properties of Ceramics 71 4.1 Defining Stress and Strain 71 4.2 Comparison of Tensile Behavior 78 4.3 Brittle Fracture of Ceramics 80 4.4 Cracking in Brittle Materials 84 4.5 Experimental Assessment of Mechanical Properties 87 4.5.1 Hardness 87 4.5.2 Compressive Strength 88 4.5.3 Flexural Strength 89 4.5.4 Tensile Strength 91 4.5.5 Elastic Modulus 91 4.5.6 Fracture Toughness 95 4.5.6.1 Notched Beam Test 96 4.5.6.2 Indentation Microfracture Method 97 4.5.7 Practical Guidelines for Reliable Measurements 98 4.6 Closure 99 References 100 Section II Fundamentals of Tribology 103 5 Contact Surface Characteristics 105 5.1 Nature and Roughness of Contact Surfaces 105 5.2 Surface Roughness Measurement 108 5.2.1 Stylus Method 108 5.2.2 Atomic Force Microscopy 109 5.2.3 Optical Interferometry 110 5.2.4 Laser Surface Profilometry 111 5.2.5 Scanning Electron Microscopy 111 5.3 Bearing Area Curve and Cumulative Distribution Function 111 5.4 Nominal Versus Real Contact Area 112 5.5 Hertzian Contact Stress 115 5.6 Closure 116 References 118 6 Friction and Interface Temperature 119 6.1 Theory of Friction 119 6.1.1 Friction Laws and Mechanisms 120 6.2 Types of Friction 125 6.2.1 Static and Kinetic Friction 125 6.2.2 Slip-Stick Friction 126 6.2.3 Rolling Friction 126 6.3 Friction of Engineering Material Classes 127 6.4 Frictional Heating and Temperature at the Interface 139 6.4.1 Heating Due to Friction 140 6.4.2 Understanding the Temperature in the Contact: The Bulk and Flash Temperatures 141 6.5 Analytical Models Used to Predict the Temperatures in the Contact 145 6.6 Implications of the Important Contact Temperature Models 146 6.6.1 Archard Model 147 6.6.2 Kong-Ashby Model 148 6.7 Closure 149 References 150 7 Wear of Ceramics and Lubrication 155 7.1 Introduction 155 7.2 Testing Methods and Quantification of Wear of Materials 157 7.3 Classification of Wear Mechanisms 158 7.3.1 Tribomechanical Wear 159 7.3.1.1 Adhesive Wear 159 7.3.1.2 Abrasive Wear 161 7.3.1.3 Fatigue Wear 164 7.3.1.4 Fretting Wear 165 7.3.1.5 Erosive Wear 167 7.3.2 Tribochemical Wear 171 7.3.2.1 Oxidative Wear 174 7.4 Lubrication 175 7.4.1 Regimes of Lubrication and the Stribeck Curve 175 7.4.2 Influence of Lubricant Composition, Contact Pressure, and Temperature on Lubrication 178 7.5 Closure 181 References 182 Section III Case Study: Sliding Wear of Ceramics 185 8 Sliding Wear of SiC Ceramics 187 8.1 Introduction 187 8.2 Materials and Experiments 188 8.3 Friction and Wear Behavior of SiC Ceramics Sintered with a Small Amount of Yttria Additive 189 8.4 Influence of Mechanical Properties on Sliding Wear of SiC Ceramics 191 8.5 Wear Mechanisms 191 8.6 Closure 192 References 193 9 Sliding Wear of SiC-WC Composites 195 9.1 Introduction 195 9.2 Microstructure and Mechanical Properties of SiC-WC Composites 196 9.3 Influence of Mating Material and WC Content on Tribological Properties 197 9.3.1 Friction and Wear Behavior 197 9.3.2 Mechanisms of Material Removal 198 9.3.3 Friction and Wear of SiC-WC Composites: System-Dependent Properties 202 9.3.4 Wear Mechanisms 202 9.4 Reciprocated Sliding Wear Behavior of SiC-WC Composites 203 9.4.1 Frictional and Wear Behavior 205 9.4.2 Critical Analysis of Wear Mechanisms 206 9.4.2.1 Wear Debris Analysis 206 9.4.2.2 Effect of Temperature 208 9.4.2.3 Effect of Test Configuration on Wear Behavior 208 9.5 Closure 209 References 210 10 Sliding Wear of Zirconia-Toughened Alumina 215 10.1 Introduction 215 10.2 Mechanical Properties of ZTA 216 10.3 Sliding Wear Properties of ZTA 219 10.4 Correlation with Theoretical Analysis 222 10.5 Closure 224 References 225 11 Abrasive Wear of Detonation Sprayed WC-12Co Coatings 227 11.1 Introduction 227 11.2 Coatings and Abrasive Wear 228 11.3 Abrasive Wear Results 230 11.4 Surface and Subsurface Damage Mechanisms 231 11.5 Closure 233 References 234 12 Solid-Lubricant Interaction and Friction at Lubricated Contacts 237 12.1 Introduction 237 12.2 Materials and Sliding Wear Experiments 239 12.3 Wetting and Spreading Properties 240 12.4 Surface Energies of Different Classes of Materials 242 12.5 Wetting Evaluation of Engineering Surfaces 242 12.6 Effect of Wetting on EHL Friction 246 12.7 Correlation Between Spreading Parameter and Friction 247 12.8 Closure 249 References 250 Section IV Case Study: Erosive Wear of Ceramics 253 13 Erosive Wear of SiC-WC Composites 255 13.1 Introduction 255 13.2 Materials and Erosion Tests 256 13.3 Influence of Type of Erodent on Erosive Wear Behavior 256 13.4 Influence of Impingement Angle and WC Content on Erosive Wear Behavior 258 13.5 Correlating Erosive Wear Behavior with Microstructural Characteristics 259 13.6 Correlating Erosive Wear Behavior with Mechanical Properties 259 13.7 Erosive Wear Behavior at High Temperature 260 13.8 Closure 262 References 263 14 Thermo-Erosive Behavior of ZrB2-SiC Composites 265 14.1 Introduction 265 14.2 High-Temperature Erosion Tests and Computational Modeling 267 14.3 Computational Modeling of Thermo-Erosive Behavior 269 14.4 High-Temperature Erosion Test Results 270 14.5 Transient Thermal Studies Using FE Analysis 271 14.6 Coupled Thermo-Structural Analysis 271 14.7 Thermo-Erosive Behavior 273 14.8 Closure 274 References 275 15 Erosive Wear of WC-Co Coating 279 15.1 Introduction 279 15.2 Materials and Erosion Experiments 280 15.3 Erosive Wear Mechanisms (Surface Damage) 282 15.4 Erosive Wear Mechanisms (Subsurface Damage) 287 15.5 Correlating Wear Mechanism with Erodent and Coating Properties 290 15.6 Closure 293 References 293 Section V Case Study: Machining-Induced Wear of Cermets 295 16 Crater Wear of TiCN Cermets in Conventional Machining 297 16.1 Introduction 297 16.2 TiCN Cermets and Machining Conditions 298 16.3 Wear Mechanisms of TiCN-WC-Ni Cermets 299 16.4 Machining with TiCN-WC-TaC-Ni-Co Cermet Tools 300 16.5 Correlating Cermet Composition, Microstructure, and Wear During Machining 304 16.6 Closure 306 References 306 17 Wear of TiCN-Based Cermets in Electrodischarge Machining 309 17.1 Introduction 309 17.2 Materials and EDM Tests 310 17.3 Wear of TiCN-Cermets During EDM 310 17.4 Mechanisms of Material Removal During EDM 311 17.5 Closure 313 References 313 Section VI Future Scope 317 18 Perspective 319 18.1 Innovation Cycle for Wear-Resistant Materials 319 18.2 In Situ Diagnosis of Tribological Interaction 321 18.3 High-Temperature Wear Testing 321 18.4 Modeling and Simulation in Tribology 322 18.5 Tribomaterialomics- A New Concept 323 18.6 Education and Mentoring of Next-Generation Researchers 327 References 328 Appendix: Appraisal 329 A.I Multiple Choice Questions 329 A.II Select the Appropriate Combination 350 A.III Fill in the Blanks with the Most Appropriate Response 352 A.IV Mention the Appropriate Material/Equipment in the Blank 353 A.V Identify Whether the Following Statements are True/False 354 A.VI Short Review Questions and Descriptive Questions 354 A.VII Analytical Questions 363 A.VIII Model Answers 366 Index 369

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