Download or read book Effects of Oxidation on Oxidation Resistant Graphite written by and published by . This book was released on 2015 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advanced Reactor Technology (ART) Graphite Research and Development Program is investigating doped nuclear graphite grades that exhibit oxidation resistance through the formation of protective oxides on the surface of the graphite material. In the unlikely event of an oxygen ingress accident, graphite components within the VHTR core region are anticipated to oxidize so long as the oxygen continues to enter the hot core region and the core temperatures remain above 400°C. For the most serious air-ingress accident which persists over several hours or days the continued oxidation can result in significant structural damage to the core. Reducing the oxidation rate of the graphite core material during any air-ingress accident would mitigate the structural effects and keep the core intact. Previous air oxidation testing of nuclear-grade graphite doped with varying levels of boron-carbide (B4C) at a nominal 739°C was conducted for a limited number of doped specimens demonstrating a dramatic reduction in oxidation rate for the boronated graphite grade. This report summarizes the conclusions from this small scoping study by determining the effects of oxidation on the mechanical strength resulting from oxidation of boronated and unboronated graphite to a 10% mass loss level. While the B4C additive did reduce mechanical strength loss during oxidation, adding B4C dopants to a level of 3.5% or more reduced the as-fabricated compressive strength nearly 50%. This effectively minimized any benefits realized from the protective film formed on the boronated grades. Future work to infuse different graphite grades with silicon- and boron-doped material as a post-machining conditioning step for nuclear components is discussed as a potential solution for these challenges in this report.
Download or read book Effects of Several Impregnants on the Oxidation Resistance of Graphite written by P. T. Whelan and published by . This book was released on 1957 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidation Resistant Graphite Studies written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Very High Temperature Reactor (VHTR) Graphite Research and Development Program is investigating doped nuclear graphite grades exhibiting oxidation resistance. During a oxygen ingress accident the oxidation rates of the high temperature graphite core region would be extremely high resulting in significant structural damage to the core. Reducing the oxidation rate of the graphite core material would reduce the structural effects and keep the core integrity intact during any air-ingress accident. Oxidation testing of graphite doped with oxidation resistant material is being conducted to determine the extent of oxidation rate reduction. Nuclear grade graphite doped with varying levels of Boron-Carbide (B4C) was oxidized in air at nominal 740°C at 10/90% (air/He) and 100% air. The oxidation rates of the boronated and unboronated graphite grade were compared. With increasing boron-carbide content (up to 6 vol%) the oxidation rate was observed to have a 20 fold reduction from unboronated graphite. Visual inspection and uniformity of oxidation across the surface of the specimens were conducted. Future work to determine the remaining mechanical strength as well as graphite grades with SiC doped material are discussed.
Download or read book Investigation of Oxidation resistant Coatings on Graphite and Molybdenum in Two Arc powered Facilities written by Roger W. Peters and published by . This book was released on 1961 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improved Oxidation resistant Carbon and Graphite Materials written by Hugh M. Muir and published by . This book was released on 1972 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wear and Friction of Oxidation resistant Mechanical Carbon graphites at 650 C in Air written by Gordon P. Allen and published by . This book was released on 1975 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of the Effects of Oxidation and the Effects of Neutron Irradiation on Graphite written by Gerhart Hennig and published by . This book was released on 1952 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The changes of the electrical properties of oxidized graphite have been compared with the changes produced by neutron irradiation. It has been possible to separate the neutron-induced damage into the damage produced by electron removal and that produced by scattering centers. A model for radiation damage has been proposed.
Download or read book Carbon and Graphite Handbook written by Charles Letnam Mantell and published by . This book was released on 1968 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidation Resistance of Selected Mechanical Carbons at 650 C in Dry Flowing Air written by Gordon P. Allen and published by . This book was released on 1973 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High temperature Oxidation resistant Coatings written by National Research Council (U.S.). Committee on Coatings and published by National Academies. This book was released on 1970-01-01 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Development on Advanced Graphite Materials written by D.A. Schulz and published by . This book was released on 1964 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Development on Advanced Graphite Materials written by K.J. Zeitsch and published by . This book was released on 1964 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oxidation Resistance of AlN coated Graphite Prepared by Plasma enhanced CVD written by H. Itoh and published by . This book was released on 1986 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Effects of Air Oxidation on the Properties of Graphite written by R.H. Knibbs and published by . This book was released on 1970 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1964 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
