Effect Of Sintering Time And Composition Of Sintering Aids On The Core Rim Microstructure And Material Properties Of Spark Plasma Sintered Silicon Carbide
DOWNLOAD
Download Effect Of Sintering Time And Composition Of Sintering Aids On The Core Rim Microstructure And Material Properties Of Spark Plasma Sintered Silicon Carbide PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Effect Of Sintering Time And Composition Of Sintering Aids On The Core Rim Microstructure And Material Properties Of Spark Plasma Sintered Silicon Carbide book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Effect Of Sintering Time And Composition Of Sintering Aids On The Core Rim Microstructure And Material Properties Of Spark Plasma Sintered Silicon Carbide
DOWNLOAD
Author : Steven E. Bagienski
language : en
Publisher:
Release Date : 2013
Effect Of Sintering Time And Composition Of Sintering Aids On The Core Rim Microstructure And Material Properties Of Spark Plasma Sintered Silicon Carbide written by Steven E. Bagienski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Ceramic materials categories.
Silicon carbide is an industrial ceramic used for many applications. Due to its complicated crystal structure, many different types exist and can be made to have a "core-rim" microstructure in individual grains. In this work, SiC samples were processed via a co-precipitation and spark plasma sintered to examine the core-rim microstructure by altering the sintering time when spark plasma sintered, the additive amounts, and the polytype composition. Samples were characterized via density, hardness, FESEM, XRD, and Raman analysis depending on the type of samples. The density and hardness of samples showed that the samples for the dwell time studied were densified but the ones of varying polytype were not. The hardness generally increased with longer sintering dwell times, whereas the density measurements were too similar to discern any appreciable difference between samples. The extent of the core-rim structure as seen from FESEM images had a large variability, but preliminary results hint at less core-rim features with longer dwell times. The XRD results were typical of the materials present in the sample and showed a SiO2 phase.
Effect Of Coprecipitation Of Sintering Aids On The Microstructure And Grain Boundary Development Of Sintered Silicon Carbide
DOWNLOAD
Author : Steven R. Mercurio
language : en
Publisher:
Release Date : 2011
Effect Of Coprecipitation Of Sintering Aids On The Microstructure And Grain Boundary Development Of Sintered Silicon Carbide written by Steven R. Mercurio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Silicon carbide categories.
Coprecipitation was examined as a method of introducing sintering aids into silicon carbide (SiC) as a fine, reactive coating. The improved sinterability and mixedness of coprecipitated samples, when coupled with advanced densification methods, developed fine grained SiC with varied microstructures. Coprecipitation imparted additional process control and influenced the phase, crystallinity, and properties of the grain boundaries. A simple coprecipitation process was developed to introduce aluminum and rare earth sintering aids into SiC. Early samples yielded low densities so the process was modified to address the dispersion of the SiC particles and breakdown of agglomerates before coating. The modifications improved the densification and influenced the structure and properties. Powders were prepared with varying weight percents of sintering aids and several rare earths in order to study the grain boundary structure and properties. Samples were densified using hot pressing and spark plasma sintering to better utilize the enhanced sinterability of coprecipitated powders. These samples were compared to conventional ball mill processing. Scanning electron microscopy was utilized to examine the microstructure and determine the grain size and presence of defects. The degree of mixedness of the additives was investigated through fluorescence measurements. X-ray diffraction was used to determine the polytype and phase distribution. Selected mechanical properties were measured and compared between the different samples. Hardness was studied extensively, including analysis of load-hardness curves over a range of loads. The hardness data and indents were examined in order to explore the fracture behavior and defect effects. Liquid phase sintered SiC prepared using coprecipitation exhibited very different phase content and crystallinity than ball milled samples. Fluorescence measurements for coprecipitated samples showed longer decay lifetimes indicating improved mixedness. Samples with amorphous grain boundaries and triple points were developed, where XRD results displayed a lower amount of yttrium aluminum garnet than other methods. The formation of a crystalline mullite phase and absence of excess alumina were observed. These overall results indicated the possibility of different fracture behavior.
Evaluating The Effect Of Powder Oxygen Content On The Microstructure And Mechanical Properties Of Silicon Carbide Densified By Spark Plasma Sintering
DOWNLOAD
Author : Vincent Alexander DeLucca
language : en
Publisher:
Release Date : 2017
Evaluating The Effect Of Powder Oxygen Content On The Microstructure And Mechanical Properties Of Silicon Carbide Densified By Spark Plasma Sintering written by Vincent Alexander DeLucca and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Silicon carbide categories.
Silicon carbide (SiC) is an important material in industry due to its favorable mechanical, thermal, chemical, and electrical properties. While it has been mainly used as an abrasive material in the past, more modern applications like armor and other structural applications, often require densified ceramic bodies. SiC powders can be densified in a number of ways, but one common method is solid-state sintering, either with or without applied pressure. It is well known that in the presence of oxygen, pure SiC will form a passivating oxide layer of silica (SiO2) on its surface. This poses a problem in sintering as SiO2 can inhibit the densification of solid state sintered SiC. This thesis examines the effects of varying oxygen content levels in silicon carbide powders on the microstructure and mechanical properties of the resulting densified bodies after solid state sintering via the spark plasma sintering (SPS) method. Two commercial SiC powders were obtained, characterized, and treated to introduce a range of different oxygen content levels. These powders were then densified via the spark plasma sintering method using boron carbide and carbon additives to produce dense samples. Three series of samples were made using each powder, one varying the amount of carbon added as a particulate, one varying the amount of carbon added as a liquid resin, and one where the oxygen content of the powder was directly manipulated by HF washing, aging, or heat treating. The dense SiC samples were then characterized to determine the effect of the powder's oxygen content on the microstructure and mechanical properties. The samples were examined using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), Knoop microhardness testing, and nondestructive ultrasonic evaluation techniques including acoustic spectroscopy and conventional NDE methods. SEM and EBSD analysis revealed that changes in the powder oxygen content can result in a number of microstructural effects. At intermediate oxygen levels, exaggerated grain growth can occur resulting in large plate-like grains, accompanied by a transformation from the 6H to 4H SiC polytype. At higher oxygen levels, densification may be inhibited and at very high oxygen contents formation of an oxygen rich secondary phase can occur. Varying the oxygen content of the SiC powder also significantly affects the mechanical properties of the dense ceramic. Ultrasonic measurements of the elastic properties showed a clear decrease in the elastic moduli as the oxygen content is increased. Knoop microhardness measurements show similar behavior with a reduction in hardness with increased powder oxygen content.
Effect Of Sintering Temperature On The Microstructure Of Liquid Phase Sintered Sic Ceramics
DOWNLOAD
Author : Maxwell R. DeGregory
language : en
Publisher:
Release Date : 2022
Effect Of Sintering Temperature On The Microstructure Of Liquid Phase Sintered Sic Ceramics written by Maxwell R. DeGregory and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Ceramic engineering categories.
This thesis investigated the change in microstructure of liquid phase sintered (LPS) silicon carbide. The four samples were each comprised of 98 wt% cubic SiC, 1 wt% alumina (A12O3), and 1 wt% yttria (Y2O3). They were sintered using spark plasma sintering at temperatures of 1350, 1450, 1500, 1550 °C for 30 minutes. SEM images and x-ray characterization were performed to observe grain growth and phase transformations of the material.
Effects Of Sintering Additive Microstructure And Proton Irradiation On Thermal Conductivity Of Spark Plasma Sintered Sic Ceramics
DOWNLOAD
Author : Zhenfei Chai
language : en
Publisher:
Release Date : 2021
Effects Of Sintering Additive Microstructure And Proton Irradiation On Thermal Conductivity Of Spark Plasma Sintered Sic Ceramics written by Zhenfei Chai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Spark Plasma Sintering Of Materials
DOWNLOAD
Author : Pasquale Cavaliere
language : en
Publisher: Springer
Release Date : 2019-02-18
Spark Plasma Sintering Of Materials written by Pasquale Cavaliere and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-18 with Technology & Engineering categories.
This book describes spark plasma sintering (SPS) in depth. It addresses fundamentals and material-specific considerations, techniques, and applications across a broad spectrum of materials. The book highlights methods used to consolidate metallic or ceramic particles in very short times. It highlights the production of complex alloys and metal matrix composites with enhanced mechanical and wear properties. Emphasis is placed on the speed of the sintering processes, uniformity in product microstructure and properties, reduced grain growth, the compaction and sintering of materials in one processing step, various materials processing, and high energy efficiency. Current and potential applications in space science and aeronautics, automation, mechanical engineering, and biomedicine are addressed throughout the book.
Sintering Techniques Of Materials
DOWNLOAD
Author : Arunachalam Lakshmanan
language : en
Publisher: BoD – Books on Demand
Release Date : 2015-04-01
Sintering Techniques Of Materials written by Arunachalam Lakshmanan and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-01 with Technology & Engineering categories.
The book covers new sintering techniques on ceramic materials, metals and composites as well as reprocessed PTFE. The book covers theoretical as well as experimental aspects on Spark Plasma Sintered (SPS) Porous copper, development of cutting blades with high hardness and resistance to cracking and wear, increased microhardness of austenitic steel ? TiB2 composites obtained with high pressure - high temperature sintering, Al2O3 porous body with cotton as the template and excellent thermal insulation with direct application for refractories as well as Metal matrix composites added nanostructured tantalum carbide and an overview of different sintering techniques used in powder metallurgy. Finally recycling of PTFE scrap materials using ram extrusion and compression molding is described.
Processing Structure Property Relationships Of Reactive Spark Plasma Sintered Boron Carbide Titanium Diboride Composites
DOWNLOAD
Author : Hunter Lide
language : en
Publisher:
Release Date : 2019
Processing Structure Property Relationships Of Reactive Spark Plasma Sintered Boron Carbide Titanium Diboride Composites written by Hunter Lide and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Sintering parameter effects on the microstructure of boron carbide and boron carbide/titanium diboride composites are investigated. The resulting microstructure and composition are characterized by scanning electron microscopy (SEM), x-ray microscopy (XRM) and x-ray diffraction (XRD). Starting powder size distribution effects on microstructure are present and effect the mechanical properties. Reactive spark plasma sintering introduces boron nitride (BN) intergranular films (IGF's) and their effects on fracture toughness, hardness and flexural strength are shown. Mechanical testing of Vickers hardness, 3-point bend and Chevron notch was done and the microstructural effects on the resulting mechanical properties are investigated.
Spark Plasma Sintering Of Materials
DOWNLOAD
Author : Pasquale Cavaliere
language : en
Publisher:
Release Date : 2019
Spark Plasma Sintering Of Materials written by Pasquale Cavaliere and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with TECHNOLOGY & ENGINEERING categories.
This book describes spark plasma sintering (SPS) in depth. It addresses fundamentals and material-specific considerations, techniques, and applications across a broad spectrum of materials. The book highlights methods used to consolidate metallic or ceramic particles in very short times. It highlights the production of complex alloys and metal matrix composites with enhanced mechanical and wear properties. Emphasis is placed on the speed of the sintering processes, uniformity in product microstructure and properties, reduced grain growth, the compaction and sintering of materials in one processing step, various materials processing, and high energy efficiency. Current and potential applications in space science and aeronautics, automation, mechanical engineering, and biomedicine are addressed throughout the book.
Sintering Technology
DOWNLOAD
Author : Malin Liu
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-10-31
Sintering Technology written by Malin Liu and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-31 with Technology & Engineering categories.
Sintering technology is an old and extensive technology in many areas, and it has been used especially in ceramic fabrication. This book covers many fields, for example, the development of different sintering technologies in recent years, such as spark plasma sintering, flash sintering, microwave sintering, reaction and laser sintering, and so on, and also some special ceramic material fabrication methods and applications, such as carbon nanotubes mixed with alumina and zirconia ceramics, pure and doped zirconia, ZnO ceramic varistors, and so on.