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Title: LOW TEMPERATURE AIR BRAZE PROCESS FOR JOINING SILICON CARBIDE COMPONENTS USED IN HEAT EXCHANGERS, FUSION AND FISSION REACTORS, AND OTHER ENERGY PRODUCTION AND CHEMICAL SYNTHESIS SYSTEMS

Authors:
 [1];  [1];  [2];  [2]
  1. Ceramatec, Inc.
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1342657
DOE Contract Number:
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 40th International Conference and Expo on Advanced Ceramics and Composites, Daytona beach, FL, USA, 20160224, 20160229
Country of Publication:
United States
Language:
English

Citation Formats

Fellows, Joseph, Lewinsohn, Charles, Katoh, Yutai, and Koyanagi, Takaaki. LOW TEMPERATURE AIR BRAZE PROCESS FOR JOINING SILICON CARBIDE COMPONENTS USED IN HEAT EXCHANGERS, FUSION AND FISSION REACTORS, AND OTHER ENERGY PRODUCTION AND CHEMICAL SYNTHESIS SYSTEMS. United States: N. p., 2017. Web. doi:10.1002/9781119321774.ch1.
Fellows, Joseph, Lewinsohn, Charles, Katoh, Yutai, & Koyanagi, Takaaki. LOW TEMPERATURE AIR BRAZE PROCESS FOR JOINING SILICON CARBIDE COMPONENTS USED IN HEAT EXCHANGERS, FUSION AND FISSION REACTORS, AND OTHER ENERGY PRODUCTION AND CHEMICAL SYNTHESIS SYSTEMS. United States. doi:10.1002/9781119321774.ch1.
Fellows, Joseph, Lewinsohn, Charles, Katoh, Yutai, and Koyanagi, Takaaki. Sun . "LOW TEMPERATURE AIR BRAZE PROCESS FOR JOINING SILICON CARBIDE COMPONENTS USED IN HEAT EXCHANGERS, FUSION AND FISSION REACTORS, AND OTHER ENERGY PRODUCTION AND CHEMICAL SYNTHESIS SYSTEMS". United States. doi:10.1002/9781119321774.ch1.
@article{osti_1342657,
title = {LOW TEMPERATURE AIR BRAZE PROCESS FOR JOINING SILICON CARBIDE COMPONENTS USED IN HEAT EXCHANGERS, FUSION AND FISSION REACTORS, AND OTHER ENERGY PRODUCTION AND CHEMICAL SYNTHESIS SYSTEMS},
author = {Fellows, Joseph and Lewinsohn, Charles and Katoh, Yutai and Koyanagi, Takaaki},
abstractNote = {},
doi = {10.1002/9781119321774.ch1},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2017},
month = {Sun Jan 01 00:00:00 EST 2017}
}

Conference:
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  • The oxidation behavior of a commercially available ceramic-to-metal braze alloy, Gold ABA, was investigated to evaluate its potential use in joining solid-state electrochemical device components. High temperature air exposure studies were performed on as-received braze alloy foils, on braze couples prepared with yttria-stabilized zirconia (YSZ) and 430 stainless steel substrates, and on brazed YSZ/430 joints. The results of our investigations demonstrate that the substrates can play an important role in determining the overall oxidation resistance of the brazed joint.
  • Two general approaches to obtaining silicon carbide-based joint materials were used. The first method relies on reactions between silicon and carbon to form silicon carbide, or to bond silicon carbide powders together. The second method consists of pyrolysing a polycarbosilane polymer to yield an amorphous, covalently bonded material. In order to assess the long-term durability of the joint materials, various heat treatments were performed and the effects on the mechanical properties of the joints were measured. Although the joints derived from the polycarbosilane polymer were not the strongest, the value of strength measured was not affected by heat treatment. Onmore » the other hand, the value of the strength of the reaction-based joints was affected by heat treatment, indicating the presence of residual stresses or unreacted material subsequent to processing. Further investigation of reaction-based joining should consist of detailed microscopic studies; however, continued study of joints derived from polymers is also warranted.« less
  • The overall goal of this project is to support Idaho National Laboratory in developing a new advanced high temperature multi fluid multi loop test facility that is aimed at investigating fluid flow and heat transfer, material corrosion, heat exchanger characteristics and instrumentation performance, among others, for nuclear applications. Specifically, preliminary research has been performed at The Ohio State University in the following areas: 1. A review of fluoride molten salts’ characteristics in thermal, corrosive, and compatibility performances. A recommendation for a salt selection is provided. Material candidates for both molten salt and helium flow loop have been identified. 2. Amore » conceptual facility design that satisfies the multi loop (two coolant loops [i.e., fluoride molten salts and helium]) multi purpose (two operation modes [i.e., forced and natural circulation]) requirements. Schematic models are presented. The thermal hydraulic performances in a preliminary printed circuit heat exchanger (PCHE) design have been estimated. 3. An introduction of computational methods and models for pipe heat loss analysis and cases studies. Recommendations on insulation material selection have been provided. 4. An analysis of pipe pressure rating and sizing. Preliminary recommendations on pipe size selection have been provided. 5. A review of molten fluoride salt preparation and chemistry control. An introduction to the experience from the Molten Salt Reactor Experiment at Oak Ridge National Laboratory has been provided. 6. A review of some instruments and components to be used in the facility. Flowmeters and Grayloc connectors have been included. This report primarily presents the conclusions drawn from the extensive review of literatures in material selections and the facility design progress at the current stage. It provides some useful guidelines in insulation material and pipe size selection, as well as an introductory review of facility process and components.« less
  • This paper describes issues related to using silicon carbide derived from inorganic polymer precursors for joining silicon carbide composites for fusion energy applications. Evolution of gases and shrinkage during processing are identified as critical processes that may control the presence of strength limiting flaws and residual stresses. Precursor composition and structure effect the amount of gaseous species evolved during processing, chemical compatibility with substrates, and processing environments. Results from the literature and from the authors' investigations are used to illustrate the use of polymer derived material for joining.
  • A parametric study that evaluated the economic performance of breeder/client systems is described. The linkage of the breeders to the clients was modelled using the stockpile approach to determine the system doubling time. Since the actual capital costs of the breeders are uncertain, a precise prediction of the cost of a breeder was not attempted. Instead, the breakeven capital cost of a breeder relative to the capital cost of a client reactor was established by equating the cost of electricity from the breeder/client system to the cost of a system consisting of clients alone. Specific results are presented for twomore » breeder/client systems. The first consisted of an LMFBR with LWR clients. The second consisted of a DT fusion reactor (with a /sup 238/U fission suppressed blanket) with LWR clients. The economics of each system was studied as a function of the cost of fissile fuel from a conventional source. Generally, the LMFBR/LWR system achieved relatively small breakeven capital cost ratios; the maximum ratio computed was 2.2 (achieved at approximately triple current conventional fissile material cost). The DTFR/LWR system attained a maximum breakeven capital cost ratio of 4.5 (achieved at the highest plasma quality (ignited device) and triple conventional fissile cost).« less