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Effect Of Processing On Fracture Toughness Of Silicon Carbide As Determined By Vickers Indentations
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Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781792687310 Total Pages :34 pages Book Rating :4.6/5 (873 download)
Book Synopsis Effect of Processing on Fracture Toughness of Silicon Carbide as Determined by Vickers Indentations by : National Aeronautics and Space Adm Nasa
Download or read book Effect of Processing on Fracture Toughness of Silicon Carbide as Determined by Vickers Indentations written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-31 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several alpha-SiC materials were processed by hot isostatic pressing (HIPing) and by sintering an alpha-SiC powder containing boron and carbon. Several beta-SiC materials were processed by HIPing a beta-SiC powder with boron and carbon additions. The fracture toughnesses K(sub 1c) of these beta- and alpha-SiC materials were estimated from measurements of Vickers indentations. The three formulas used to estimate K(sub 1c) from the indentation fracture patterns resulted in three ranges of K(sub 1c) estimates. Furthermore, each formula measured the effects of processing differently. All three estimates indicated that fine-grained HIPed alpha-SiC has a higher K(sub 1c) than coarsed-grained sintered alpha-SiC. Hot isostatically pressed beta-SiC, which had an ultrafine grain structure, exhibited a K(sub 1c) comparable to that of HIPed alpha-SiC. Dannels, Christine M. and Dutta, Sunil Glenn Research Center NASA-TM-101456, E-4565, NAS 1.15:101456 RTOP 505-63-1A...
Book Synopsis Effect of Processing on Fracture Toughness of Silicon Carbide as Determined by Vickers Indentations by :
Download or read book Effect of Processing on Fracture Toughness of Silicon Carbide as Determined by Vickers Indentations written by and published by . This book was released on 1989 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wen ti ming bian xu shuo written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determining the Toughness of Ceramics from Vickers Indentationsusing the Crack-opening Displacements by :
Download or read book Determining the Toughness of Ceramics from Vickers Indentationsusing the Crack-opening Displacements written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, a method for evaluating the fracture toughness of ceramics has been proposed based on the computed crack-opening displacements of cracks emanating from Vickers hardness indentations. In order to verify this method, experiments were carried out to determine the toughness of a commercial silicon carbide ceramic, Hexaloy SA, by measuring the crack-opening profiles of such Vickers indentation cracks. While the obtained toughness value of Ko = 2.3 MPavm was within 10% of that measured using conventional fracture toughness testing, the computed crack-opening profiles corresponding to this toughness displayed poor agreement with those measured experimentally, raising concerns about the suitability of this method for determining the toughness of ceramics. The effects of subsurface cracking and cracking during loading are considered as possible causes of such discrepancies, with the former based on evidence observed for secondary radial cracking which affected the crack opening profile and deduced toughness values.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Single Edge Notched Beam and Indentation Techniques to Determine Fracture Toughness of Alpha Silicon Carbide by : SG. Seshadri
Download or read book Application of Single Edge Notched Beam and Indentation Techniques to Determine Fracture Toughness of Alpha Silicon Carbide written by SG. Seshadri and published by . This book was released on 1981 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper is concerned with procedural developments for the application of single edge notched beam (SENB) and indentation techniques to determine the fracture toughness of sintered alpha silicon carbide. For the SENB method, the following experimental variables were examined: relative notch depth, deformation speed, temperature, and atmosphere. Based on the results, a notch depth ratio of 0.4 and a deformation speed of 8.46 x 10-6 m/s (0.02 in./min) are recommended for this material. The effect of temperature in air on KIc determination is such that crack blunting occurs due to oxidation, yielding erroneous results. By using Vicker's indentation with varying loads, fracture toughness values were calculated from careful measurements of dimensions of median cracks and the indentations. In addition, Knoop indentations with loads ranging from 1 to 5 kg were made. The results of this controlled surface flaw technique showed that the fracture toughness was independent of the indentation load used. Residual stresses caused by indentation were removed by surface grinding as well as by annealing in argon at 1000 to 1200°C. These procedures increased KIc-values by approximately 20 to 40 percent. The greatest experimental difficulty in the controlled flaw method for alpha silicon carbide arises in the flaw profile estimation from SEM fractographs. In the majority of cases, there are no clear mirror-like surface flaws beneath the indent causing errors in measurement of flaw sizes.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Temperature Ceramic Matrix Composites 8 by : Litong Zhang
Download or read book High Temperature Ceramic Matrix Composites 8 written by Litong Zhang and published by John Wiley & Sons. This book was released on 2014-05-19 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings contains 78 papers from the 8th International Conference on High Temperature Ceramic Matrix Composites, held September 22-26, 2013 in Xi'an, Shaanxi, China. Chapters include: Ceramic Genome, Computational Modeling, and Design Advanced Ceramic Fibers, Interfaces, and Interphases Nanocomposite Materials and Systems Polymer Derived Ceramics and Composites Fiber Reinforced Ceramic MatrixComposites Carbon-Carbon Composites: Materials, Systems, and Applications Ultra High Temperature Ceramics and MAX Phase Materials Thermal and Environmental Barrier Coatings
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1991 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Analysis of Precracking Parameters and Fracture Toughness for Ceramic Single-edge-precracked-beam Specimens by : Sung R. Choi
Download or read book Analysis of Precracking Parameters and Fracture Toughness for Ceramic Single-edge-precracked-beam Specimens written by Sung R. Choi and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1989 with total page 1372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dependence of Fracture Toughness on Crystallographic Orientation in Single-Crystalline Cubic ([beta] Silicon Carbide by :
Download or read book Dependence of Fracture Toughness on Crystallographic Orientation in Single-Crystalline Cubic ([beta] Silicon Carbide written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Along with other desirable properties, the ability of silicon carbide (SiC) to retain high strength after elevated temperature exposures to neutron irradiation renders it potentially applicable in fusion and advanced fission reactors. However, properties of the material such as room temperature fracture toughness must be thoroughly characterized prior to such practical applications. The objective of this work is to investigate the dependence of fracture toughness on crystallographic orientation for single-crystalline [beta]-SiC. X-ray diffraction was first performed on the samples to determine the orientation of the crystal. Nanoindentation was used to determine a hardness of 39.1 and 35.2 GPa and elastic modulus of 474 and 446 GPa for the single-crystalline and polycrystalline samples, respectively. Additionally, crack lengths and indentation diagonals were measured via a Vickers micro-hardness indenter under a load of 100 gf for different crystallographic orientations with indentation diagonals aligned along fundamental cleavage planes. Upon examination of propagation direction of cracks, the cracks usually did not initiate and propagate from the corners of the indentation where the stresses are concentrated but instead from the indentation sides. Such cracks clearly moved along the {1 1 0} family of planes (previously determined to be preferred cleavage plane), demonstrating that the fracture toughness of SiC is comparatively so much lower along this set of planes that the lower energy required to cleave along this plane overpowers the stress-concentration at indentation corners. Additionally, fracture toughness in the 1 1 0 direction was 1.84 MPa·m1/2, lower than the 3.46 MPa·m1/2 measured for polycrystalline SiC (which can serve as an average of a spectrum of orientations), further demonstrating that single-crystalline [beta]-SiC has a strong fracture toughness anisotropy.
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1995-10 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silicon Carbide by : Moumita Mukherjee
Download or read book Silicon Carbide written by Moumita Mukherjee and published by BoD – Books on Demand. This book was released on 2011-10-10 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon Carbide (SiC) and its polytypes, used primarily for grinding and high temperature ceramics, have been a part of human civilization for a long time. The inherent ability of SiC devices to operate with higher efficiency and lower environmental footprint than silicon-based devices at high temperatures and under high voltages pushes SiC on the verge of becoming the material of choice for high power electronics and optoelectronics. What is more important, SiC is emerging to become a template for graphene fabrication, and a material for the next generation of sub-32nm semiconductor devices. It is thus increasingly clear that SiC electronic systems will dominate the new energy and transport technologies of the 21st century. In 21 chapters of the book, special emphasis has been placed on the materials aspects and developments thereof. To that end, about 70% of the book addresses the theory, crystal growth, defects, surface and interface properties, characterization, and processing issues pertaining to SiC. The remaining 30% of the book covers the electronic device aspects of this material. Overall, this book will be valuable as a reference for SiC researchers for a few years to come. This book prestigiously covers our current understanding of SiC as a semiconductor material in electronics. The primary target for the book includes students, researchers, material and chemical engineers, semiconductor manufacturers and professionals who are interested in silicon carbide and its continuing progression.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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