Polymer Derived Ceramics
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Polymer Derived Ceramics
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Author : Paolo Colombo
language : en
Publisher: DEStech Publications, Inc
Release Date : 2010
Polymer Derived Ceramics written by Paolo Colombo and has been published by DEStech Publications, Inc this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Technology & Engineering categories.
This book presents the foundations of the science of polymer derived ceramics, enriched with many descriptions of applications. Written by a team of selected researchers, the text is a systematic, comprehensive introduction to all phases of polymer derived ceramics from synthesis strategies through properties measurement, and applications. New material is given on the nanolevel structure of PDCs, and it is shown how nano-sized modifications can alter and improve the properties of polymer derived ceramics, including high chemical durability, oxidation resistance, luminescence, and piezo-resistivity. Groundbreaking work is also described on novel precursors such as stoichiometric SiC, BN, and SiBCN ceramics. In terms of technology, this volume explains how PDCs are fabricated and how these novel materials are used in membranes, filters, MEMS, fibers, and micro-components. This book covers: synthesis, structure, properties and applications; strategies for characterizing and synthesizing PDCs; and, original research on pre-ceramic PDC precursors.
Advances In Polymer Derived Ceramics And Composites
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Author : Paolo Colombo
language : en
Publisher: John Wiley & Sons
Release Date : 2010-07-20
Advances In Polymer Derived Ceramics And Composites written by Paolo Colombo and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-07-20 with Technology & Engineering categories.
This book collects some of papers presented at the very successful Symposium "Polymer Derived Ceramics and Composites" in the framework of the 8th Pacific Rim Conference on Ceramic and Glass Technology. There, over 70 researchers from around the world discussed their latest innovations over four full days. It covers all the main aspects of interdisciplinary research and development in the field of Polymer-Derived-Ceramics, from the precursor synthesis and characteristics to the polymer-to-ceramic conversion, from processing and shaping of preceramic polymers into ceramic components to their microstructure at the nano- and micro-scale, from their properties to their most relevant applications in different fields.
Additive Manufacturing Of Polymer Derived Ceramics
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Author : Stephan Andrew Brinckman
language : en
Publisher:
Release Date : 2022
Additive Manufacturing Of Polymer Derived Ceramics written by Stephan Andrew Brinckman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Additive manufacturing categories.
Additive manufacturing (AM) – or 3D printing – can bring computer designed models to life by depositing material layer-by-layer to replicate the model. While AM is now hotbed of research and ingratiated in commercial use, the most common materials which are printed are metals or polymer-based. In general, forming of ceramic materials into complex shapes is difficult to do with traditional manufacturing due to high-cost and lack of machinability. This makes ceramic materials a perfect candidate for AM processes. One method, pioneered within the last decade is the direct printing of pre-ceramic polymer materials, which utilizes polymer-derived ceramics (PDCs). PDCs are a class of material which begin as a polymer and then pyrolyzed at high temperature in an inert atmosphere to convert the polymer to a ceramic. Certain pre-ceramic polymers can be mixed with a photoinitiator and subjected to UV light in a vatphotopolymerization 3D – in particular stereolithography or digital light projection – printing technique form a pre-ceramic polymer stucture which can then be pyrolyzed to create ceramic parts which retain the same net-shape as the printed part. Throughout this work there was development of two successful pre-ceramic resins and in addition the impact on the use of fillers in the resin and the effect of printing parameters on the mechanical properties of the ceramic materials were investigated. The future outlook of 3D printing PDCs and their end-use applications are also discussed.
Special Issue On Applications Of Polymer Derived Ceramics
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Author : Paolo Colombo
language : en
Publisher:
Release Date : 2009
Special Issue On Applications Of Polymer Derived Ceramics written by Paolo Colombo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Additive Manufacturing Of Polymer Derived Ceramics
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Author : Shruti Gupta
language : en
Publisher:
Release Date : 2023
Additive Manufacturing Of Polymer Derived Ceramics written by Shruti Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
This dissertation describes the stereolithography-based additive manufacturing of ceramic matrix composites starting from preceramic polymers. Preceramic polymer route to produce high performance silicon carbide based ceramic matrix composites has been explored with various techniques to produce parts with high strengths. This route makes polymer processing amenable to ceramics. Ceramic matrix composites (CMCs), especially those based on SiC or SiOC, possess low weight and exhibit superior high temperature properties. It is possible to attain a higher degree of synthetic control over the microstructure and properties due to the tailorable polymer precursor chemistry and processing. Polymer-derived ceramics (PDCs) produced upon pyrolysis are mostly amorphous solids often containing a large amount of free carbon. However, the main issue with producing such ceramics is the inherent density increase from the preceramic polymer (1 g/cc) to 3.21 g/cc of the SiC ceramic. This results in a tremendous amount of shrinkage during the polymer to ceramic transformation causing cracks and pore formation in the ceramic matrix. The mechanical strength of PDCs suffers from these cracks, pores and microstructure inhomogeneities. Despite its benefits, the SLA process faces the challenge of producing PDCs with high strengths. The goal of this dissertation is to identify techniques to combat defects in SLA printed ceramics and increase their mechanical strength. This dissertation details exploratory work in identifying 3 main materials and processing pathways to predict and resolve such shrinkage-related microstructural defects in the PDCs. Firstly, if the shrinkage in the preceramic polymer matrix governs the pore and crack formation, it is vital to determine how the mechanical properties of these SLA printed green bodies affect the strength of the PDC formed upon pyrolysis. Therefore, the first study was based on comparing the mechanical properties of the printed green bodies of the preceramic resins to those of the pyrolyzed ceramics. Properties of the printed preceramic polymer such as the modulus and strain-at-break played an important role in determining the failure in the PDCs. These properties can be modulated by choosing an appropriate crosslinking chemistry Such comparative studies between these properties of the green bodies and the ceramic microstructure have not been conducted in the past. This work identifies strain-at-break as a new parameter to be considered to predict the amount of shrinkage sustained by the matrix without cracking. By eliminating cracks, higher strengths can be achieved. The compressive strengths of the lattices produced in this work were comparable to the highest reported values in the literature. Secondly, if inert fillers such as ceramic particles are added to the preceramic resin as second phase heterogeneities, then the overall density of the PDC will increase and the shrinkage will be reduced as shrinkage will not occur in the volume occupied by the inert fillers. In the next part of this dissertation, the effect of silicon nitride inert fillers in the PDC matrix on the strength of the composite PDCs was studied. It was observed that not only the amount of particle loading, but also the particle size affected the strengths of such ceramic composites. Besides, preliminary studies on polymer infiltration and pyrolysis (PIP) of ceramics produced with high solids loading were carried out. This process generated flexural strengths of 197 MPa, higher than other techniques reported in this work. A combination of SLA printing and PIP showed promise in future development of high strength industrially important parts such as gas turbine blades, splash plates and heat exchangers. Lastly, if reactive components (or active fillers) such as transition metals are present in the preceramic polymer system, upon pyrolysis, the reaction of such active fillers with the gaseous byproducts will cause an expansion in the volume of the PDC matrix during pyrolysis, thereby curbing the shrinkage. Importantly for the additive manufacture of ceramics, this is the first report on the incorporation of active fillers in vat photopolymerization techniques. Chapter 7 will describe iron as an active filler which when present in catalytic amounts in siloxane-based resins lowered the crystallization temperature of SiC to ~1200°C. This process will enable low temperature fabrication of more complex PDCs while also improving their strengths. The presence of crystalline domains of silicon carbide served as reinforcements to the PDC matrix. Preliminary work was also carried out on titanium as an active filler. In both cases, addition of active filler significantly increased the strengths of the PDCs.
Literature Review Of Polymer Derived Ceramics
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Author :
language : en
Publisher:
Release Date : 2016
Literature Review Of Polymer Derived Ceramics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Polymer Derived Ceramics (PDCs), also known as preceramic polymers, are valuable coating agents that are used to produce surface barriers on substrates such as stainless steel. These barriers protect against a multitude of environmental threats, and have been used since their research and development in 19772. This paper seeks to review and demonstrate the remarkable properties and versatility that PDCs have to offer, while also giving a brief overview of the processing techniques used today.
Advances In Polymer Derived Ceramics And Composites
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Author : Rishi Raj
language : en
Publisher:
Release Date : 2010
Advances In Polymer Derived Ceramics And Composites written by Rishi Raj and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Span style="font-size: 10pt; font-family: 'Times New Roman', 'serif'; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US"This book collects some of papers presented at the very successful Symposium "Polymer Derived Ceramics and Composites" in the framework of the 8th Pacific Rim Conference on Ceramic and Glass Technology. There, over 70 researchers from around the world discussed their latest innovations over four full days. It covers all the main aspects of interdisciplinary research and development in the field of Polymer-Derived-Ceramics, from the precursor synthesis and characteristics to the polymer-to-ceramic conversion, from processing and shaping of preceramic polymers into ceramic components to their microstructure at the nano- and micro-scale, from their properties to their most relevant applications in different fields.
Polymer Derived Ceramics
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Author : BCC Research
language : en
Publisher:
Release Date : 2018-05
Polymer Derived Ceramics written by BCC Research and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05 with categories.
Production Of Bulk Ceramic Shapes From Polymer Derived Ceramics
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Author : Arnold Hill
language : en
Publisher:
Release Date : 2008
Production Of Bulk Ceramic Shapes From Polymer Derived Ceramics written by Arnold Hill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Ceramics categories.
A method has been developed to produce bulk ceramic components from a class of ceramics known as polymer derived ceramics. In the past polymer derived ceramics have been limited to thin film applications or in the fabrication of MEMS devices. The reason being that when the polymer is into a ceramic, large quantities of gas are generated which produce internal pressure that fractures the ceramic components. The method developed here solves that issue by casting into the polymer a 3 dimensional network of polymer fibers in the form of a foam which, during pyrolysis, burns out and leaves a network of open channels that allows decomposition gases to escape thus preventing pressure from building up. The inclusion of the polymer foam allows for the formation of strong plastic like green bodies which can be machined into any shape. The green bodies are then pyrolized into ceramic components. This process allows for the simple and inexpensive fabrication of complex ceramic components that have the potential to replace current components that are made with traditional methods.
Precursor Derived Ceramics
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Author : Joachim Bill
language : en
Publisher: John Wiley & Sons
Release Date : 2008-07-11
Precursor Derived Ceramics written by Joachim Bill and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-11 with Technology & Engineering categories.
The production of high-purity ceramic materials from low-molecular weight, inorganic or organoelement precursors is a topic of increasing relevance within materials science. With this emerging technology it is possible to precisely tailor the properties of the ceramic material which enables new high-temperature or electronic applications. Every materials scientist and engineer involved in the research and development of new high-performance ceramic materials will find these results - presented at a recent workshop of the Max-Planck-Gesellschaft - of great importance for his own work.