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Author: Akshay Kumar Publisher: LAP Lambert Academic Publishing ISBN: 9783848498260 Category : Languages : en Pages : 216
Book Description
Tungsten carbide (WC) is widely used in manufacturing industries because of its higher wear resistance property. The high hardness and melting point with excellent abrasive and corrosion resistance properties makes it most suitable for cutting tool industries. In order to increase the tool life efforts are being made to synthesize nano size WC powders through different techniques. In the present work WC nano particles were synthesize at comparative low temperature by thermo chemical route, and by mechanical synthesis route direct from the Wolframite ore. The synthesized nano WC powders were embedded in cobalt matrix and sintered. Cutting tool based on nano structured WC-Co particles will bring a revolutionary change in the development of cutting tool and also affect the cost of many other products related to the development of tool materials. The tool life is directly related to the size and distribution of WC particles in Co matrix. The reduced size of WC particles will lead more uniform distribution of it in Co matrix, which ultimately will lead to have more life time of cutting tool as compared to conventional material.
Author: Akshay Kumar Publisher: LAP Lambert Academic Publishing ISBN: 9783848498260 Category : Languages : en Pages : 216
Book Description
Tungsten carbide (WC) is widely used in manufacturing industries because of its higher wear resistance property. The high hardness and melting point with excellent abrasive and corrosion resistance properties makes it most suitable for cutting tool industries. In order to increase the tool life efforts are being made to synthesize nano size WC powders through different techniques. In the present work WC nano particles were synthesize at comparative low temperature by thermo chemical route, and by mechanical synthesis route direct from the Wolframite ore. The synthesized nano WC powders were embedded in cobalt matrix and sintered. Cutting tool based on nano structured WC-Co particles will bring a revolutionary change in the development of cutting tool and also affect the cost of many other products related to the development of tool materials. The tool life is directly related to the size and distribution of WC particles in Co matrix. The reduced size of WC particles will lead more uniform distribution of it in Co matrix, which ultimately will lead to have more life time of cutting tool as compared to conventional material.
Author: Alexey S. Kurlov Publisher: Springer Science & Business Media ISBN: 3319005243 Category : Technology & Engineering Languages : en Pages : 253
Book Description
This book embraces the entire range of problems associated with phase equilibria in “tungsten – carbon” binary system and related ternary systems, nonstoichiometry, disorder and order in different tungsten carbides, electronic and crystal structure of these carbides. The main application of tungsten carbides is constituent in hardmetals for cutting tools. In the last 20 years, the most active efforts were made in synthesis and application of nanocrystalline tungsten carbide for the production of nanostructured hardmetals. The present book describes in detail different methods for production of nanocrystalline tungsten carbide. The peculiarities of sintering of Co hardmetals from nanocrystalline powders having different particle sizes are discussed. Materials scientists using tungsten carbide to create novel superhard and tough materials will find this book particularly useful.
Author: Ross Franklin Boland Publisher: ISBN: Category : Electronic dissertations Languages : en Pages :
Book Description
The consolidation of WC-Co powder with a âˆ1⁄450 nanometer (nm) WC grain size (nWC) was investigated using high-velocity oxygen-fuel (HVOF) thermal spray deposition. Initial baseline data representative of the state-of-the-art of thermal spray deposition of WC-Co coatings was established using Diamalloyâ„¢ 2003, a premium grade WC-Co powder, and a Sulzer-Metco Diamond Jetâ„¢ (DJ) system. An increased understanding of the HVOF thermal spray process was established via a correlation of DJ process variables to the mechanisms of WC-Co coating defect formation. The critical HVOF process variables were identified as WC-Co particle size, DJ gun-to-substrate distance, DJ gun translation velocity, and powder feed rate, and a mechanism for controlled porosity formation in coatings was identified. These data were used to formulate a HVOF optimizing procedure which was used for DJ thermal spray of nWC-Co coatings. As-synthesized nWC-Co particles are hollow shells with diameters of 25–125 Î1⁄4m. Incomplete matrix melting of as-synthesized nWC-Co occurred during W thermal spray and indicated the need for higher density particles. Heat treatments at 900–1400°C reveal that insignificant densification of the hollow shell nWC-Co particles occurred prior to their sintering at contact points, and indicated that mechanical reprocessing was required. To this end a process using ultrasonic disintegration of nWC-Co powder and spray dry re-agglomeration was developed. DJ thermal spray of reprocessed nWC-Co and nWC-Co+VC (vanadium carbide is a WC grain growth inhibitor) powders demonstrated that VC did not effect nWC grain size of coatings. DJ thermal sprayed nWC-Co coatings were near fully dense with a mean WC grain size of âˆ1⁄4200 nm, but displayed extensive nWC oxidation. The addition of 2.5 and 5 wt % C during reprocessing of nWC-8Co powder significantly lowered the oxidation of nWC during DJ thermal spray. Addition of 5 wt % C produced a slightly lower nWC-8Co coating hardness than 2.5 wt% C, due to η carbide formation. The W thermal spray of nWC-8Co-2.5C powder using nitrogen DJ gun cooling demonstrated that exclusion of oxygen from the cooling gas caused a significant additional reduction in the oxidation of nWC, yielding a coating hardness value superior to Diamalloy 2003 coatings.
Author: S H Whang Publisher: Elsevier ISBN: 0857091123 Category : Technology & Engineering Languages : en Pages : 840
Book Description
Tensile strength, fatigue strength and ductility are important properties of nanostructured metallic materials, which make them suitable for use in applications where strength or strength-to-weight ratios are important. Nanostructured metals and alloys reviews the latest technologies used for production of these materials, as well as recent advances in research into their structure and mechanical properties.One of the most important issues facing nanostructured metals and alloys is how to produce them. Part one describes the different methods used to process bulk nanostructured metals and alloys, including chapters on severe plastic deformation, mechanical alloying and electrodeposition among others. Part two concentrates on the microstructure and properties of nanostructured metals, with chapters studying deformation structures such as twins, microstructure of ferrous alloys by equal channel angular processing, and characteristic structures of nanostructured metals prepared by plastic deformation. In part three, the mechanical properties of nanostructured metals and alloys are discussed, with chapters on such topics as strengthening mechanisms, nanostructured metals based on molecular dynamics computer simulations, and surface deformation. Part four focuses on existing and developing applications of nanostructured metals and alloys, covering topics such as nanostructured steel for automotives, steel sheet and nanostructured coatings by spraying.With its distinguished editor and international team of contributors, Nanostructured metals and alloys is a standard reference for manufacturers of metal components, as well as those with an academic research interest in metals and materials with enhanced properties.
Author: Andre Pierre Legrand Publisher: CRC Press ISBN: 0203222296 Category : Technology & Engineering Languages : en Pages : 319
Book Description
In recent years an increasing interest has been devoted to nanostructured composites. This attention is largely due to exciting possible applications ranging from new catalysts to the preparation of nanocomposites ceramics, with significant improvements in their properties. This book provides a comprehensive survey of French contributions t
Author: Andrey A. Radionov Publisher: Springer Nature ISBN: 3030548171 Category : Technology & Engineering Languages : en Pages : 1416
Book Description
This book highlights recent findings in industrial, manufacturing and mechanical engineering, and provides an overview of the state of the art in these fields, mainly in Russia and Eastern Europe. A broad range of topics and issues in modern engineering are discussed, including the dynamics of machines and working processes, friction, wear and lubrication in machines, surface transport and technological machines, manufacturing engineering of industrial facilities, materials engineering, metallurgy, control systems and their industrial applications, industrial mechatronics, automation and robotics. The book gathers selected papers presented at the 6th International Conference on Industrial Engineering (ICIE), held in Sochi, Russia in May 2020. The authors are experts in various fields of engineering, and all papers have been carefully reviewed. Given its scope, the book will be of interest to a wide readership, including mechanical and production engineers, lecturers in engineering disciplines, and engineering graduates.
Author: Akshay Kumar
Author: Akshay Kumar
Author: Alexey S. Kurlov
Author: Ross Franklin Boland
Author: Ross R. Boland
Author: Li Wu
Author: S H Whang
Author: Perry G. Cotter
Author: Andre Pierre Legrand
Author: Andrey A. Radionov
Author: James A. Schwarz