Analysis of the Temperature Profile of Ceramic Composite Materials Exposed to Combined Conduction–Radiation Between Concentric Cylinders

1998 ◽  
Vol 120 (2) ◽  
pp. 271-275 ◽  
Author(s):  
A. Tremante ◽  
F. Malpica
Keyword(s):  
Ceramic Composite ◽  
Numerical Study ◽  
Thermal Characteristics ◽  
Ceramic Matrix Composites ◽  
Gray Model ◽  
Matrix Composites ◽  
Semitransparent Materials ◽  
Concentric Cylinders ◽  
Benchmark Solutions ◽  
Potential Use

A numerical study is made of the thermal characteristics of semitransparent materials exposed to simultaneous conduction and radiation between concentric cylinders. For extremely high-temperature applications, where radiative transfer plays an important role, ceramic-matrix composites, considered as semitransparent materials, are being explored for potential use in turbine and compressor components, spacecraft structures, engine control systems and nuclear reactors. Through the use of a gray model and the two-flux method, specialized equations are developed that generate a system of nonlinear ordinary differential equations. To facilitate the solution of this system, an iterative strategy is adopted. In order to demonstrate the versatility and accuracy of the proposed methodology, the results of several numerical experiments are presented and compared with benchmark solutions.

scholarly journals Analysis of the Temperature Profile of Ceramic Composite Materials Exposed to Combined Conduction-Radiation Between Concentric Cylinders

1997 ◽  
Author(s):  
Andrés Tremante ◽  
Freddy Malpica
Keyword(s):  
Ceramic Composite ◽  
Numerical Study ◽  
Thermal Characteristics ◽  
Ceramic Matrix Composites ◽  
Gray Model ◽  
Matrix Composites ◽  
Semitransparent Materials ◽  
Concentric Cylinders ◽  
Benchmark Solutions ◽  
Potential Use

A numerical study is made of the thermal characteristics of semitransparent materials exposed to simultaneous conduction and radiation between concentric cylinders. For extremely high-temperature applications, where radiative transfer plays an important role, ceramic-matrix composites, considered as semitransparent materials, are being explored for potential use in turbines and compressors components, spacecraft structures, engine control systems and nuclear reactors. Through the use of a gray model and the the two flux method, specialized equations are developed that generate a system of nonlinear ordinary differential equations. To facilitate the solution of this system, an iterative strategy is adopted. In order to demonstrate the versatility and accuracy of the proposed methodology, the results of several numerical experiments are presented and compared with benchmark solutions.

Contribution of Thermal Radiation to the Temperature Profile of Ceramic Composite Materials

1993 ◽  
Author(s):  
Andrés Tremante ◽  
Freddy Malpica
Keyword(s):  
Control Systems ◽  
Ceramic Composite ◽  
Large Time ◽  
Numerical Procedure ◽  
Ceramic Matrix Composites ◽  
Heat Fluxes ◽  
Matrix Composites ◽  
Flux Model ◽  
Planar Medium ◽  
Potential Use

The steady energy transfer equation by simultaneous conduction and radiation in an absorbing, emitting and non-scattering gray planar medium is studied theoretically. For extremely high-temperature applications, where radiative transfer plays an important role, ceramic-matrix composites, considered as semitransparent materials, are being explored for potential use in turbine and compressors components, spacecraft structures, engine control systems and nuclear reactors. Exact solution of the above mentioned radiative problems is seldom possible and large-time consuming numerical approximations are then used. A technique combining an accurate physical formulation, the two-flux model, coupled to a fast numerical procedure for the calculation of the temperature and heat fluxes is described.

Contribution of Thermal Radiation to the Temperature Profile of Ceramic Composite Materials

1994 ◽  
Vol 116 (3) ◽  
pp. 583-586 ◽  
Author(s):  
A. Tremante ◽  
F. Malpica
Keyword(s):  
Control Systems ◽  
Ceramic Composite ◽  
Nuclear Reactors ◽  
Numerical Procedure ◽  
Ceramic Matrix Composites ◽  
Heat Fluxes ◽  
Matrix Composites ◽  
Flux Model ◽  
Planar Medium ◽  
Potential Use

The steady energy transfer equation for simultaneous conduction and radiation in an absorbing, emitting, and nonscattering gray planar medium is studied theoretically. For extremely high-temperature applications, where radiative transfer plays an important role, ceramic-matrix composites, considered as semitransparent materials, are being explored for potential use in turbine and compressor components, spacecraft structures, engine control systems, and nuclear reactors. Exact solution of the above-mentioned radiative problems is seldom possible and time-consuming numerical approximations are then used. A technique combining an accurate physical formulation, the two-flux model, coupled to a fast numerical procedure for the calculation of the temperature and heat fluxes is described.

scholarly journals Nondestructive Characterization of Ceramic Composites Used as Combustor Liners in Advanced Gas Turbines

1995 ◽  
Author(s):  
W. A. Ellingson ◽  
S. A. Rothermel ◽  
J. F. Simpson
Keyword(s):  
Gas Turbines ◽  
Thermal Characteristics ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Matrix Composites ◽  
Full Field ◽  
X Ray ◽  
X Ray Imaging ◽  
Combustor Liner ◽  
Nondestructive Characterization

Nondestructive characterization (NDC) methods which can provide full field information about components prior to and during use are critical to the reliable application of continuous fiber ceramic matrix composites in high firing temperature (>1350°C) gas turbines. For combustor liner applications, although nonmechanical load bearing components, thermal characteristics as well as mechanical integrity is vitally important. NDC methods being developed to provide necessary information include x-ray computed tomography (mainly for through-wall density and delamination detection), infrared-based thermal diffusivity imaging, and single-wall through-transmission x-ray imaging (mainly for fiber content and alignment detection). Correlation of the data obtained from NDC methods with subscale combustor liner tests have shown positive results at thermal cycling temperatures from 700°C to 1177°C.

Nondestructive Characterization of Ceramic Composites Used as Combustor Liners in Advanced Gas Turbines

1996 ◽  
Vol 118 (3) ◽  
pp. 486-490
Author(s):  
W. A. Ellingson ◽  
S. A. Rothermel ◽  
J. F. Simpson
Keyword(s):  
Gas Turbines ◽  
Thermal Characteristics ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Matrix Composites ◽  
Full Field ◽  
X Ray ◽  
X Ray Imaging ◽  
X Ray Computed ◽  
Nondestructive Characterization

Nondestructive characterization (NDC) methods, which can provide full-field information about components prior to and during use, are critical to the reliable application of continuous fiber ceramic matrix composites in high-firing-temperature (>1350°C) gas turbines. [For combustor liners, although they are nonmechanical load-bearing components, both thermal characteristics and mechanical integrity are vitally important.] NDC methods being developed to provide necessary information include x-ray computed tomography (mainly for through-wall density and delamination detection), infrared-based thermal diffusivity imaging, and single-wall through-transmission x-ray imaging (mainly for fiber content and alignment detection). Correlation of the data obtained from NDC methods with subscale combustor liner tests have shown positive results at thermal cycling temperatures from 700°C to 1177°C.

Processing of Polymeric Precursor, Ceramic Matrix Composites

1988 ◽  
Vol 120 ◽  
Author(s):  
R. J. Diefendorf ◽  
R. P. Boisvert
Keyword(s):  
Barrier Layer ◽  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Processing Technique ◽  
Matrix Composites ◽  
Brittle Behavior ◽  
Sic Ceramic ◽  
Sic Whiskers ◽  
Polymer Pyrolysis

AbstractCeramic matrix composites have been produced by utilizing polymer pyrolysis as the processing technique. The precursor, polyvinylsilane, is a viscous, thermosetting polymer which yields a predominantly SiC ceramic material when pyrolyzed. This organometallic polymer in combination with SiC fibers and SiC whiskers was used to fabricate ceramic matrix composites. One of the major problems with a brittle/brittle composite system in which strong coupling exist between the fibers and matrix is the characteristic catastrophic failure that occurs once the strain to failure of one of the constituents is exceeded. This brittle behavior can be altered by the application of a suitable barrier layer between the fiber and matrix. Due to the success of a barrier layer between fiber and matrix in producing higher performance composites, multiple barrier layers were used to further improve the performance of the ceramic composite.

scholarly journals ASME Code Rules and ASTM Standards Integration for Ceramic Composite Core Materials and Components1

2021 ◽  
Vol 2048 (1) ◽  
pp. 012020
Author(s):  
J W Geringer ◽  
Y Katoh ◽  
S Gonczy ◽  
T Burchell ◽  
M Mitchell ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Test Methods ◽  
Code Design ◽  
Matrix Composites ◽  
Asme Code ◽  
Ceramic Composite Materials ◽  
American Society

Abstract Fiber-reinforced ceramic matrix composites have many desirable properties for high-temperature nuclear applications, including excellent thermal and mechanical properties and reasonable to outstanding radiation resistance. Over the last 20 years, the use of ceramic composite materials has already expanded in many commercial nonnuclear industries as fabrication and application technologies mature. The new ASME design and construction rules under Section III, Subsection HH, Subpart B lay out the requirements and criteria for materials, design, machining and installation, inspection, examination, testing, and the marking procedure for ceramic composite core components, which is similar to the established graphite code under Section III, Subsection HH, Subpart A. Moreover, the general requirements listed in Section III, Subsection HA, Subpart B are also expanded to include ceramic composite materials. The code rules rely heavily on the development and publication of standards for composite specification, classification, and testing of mechanical, thermal, and other properties. These test methods are developed in the American Society for Testing and Materials Committee C28 on Advanced Ceramics with a current focus on ceramic composite tubes. Details of the composites code, design methodology, and similarities to the graphite code, as well as guidance for the development of specifications for ceramic composites for nuclear application and recent standard developments, are discussed. The next step is to “close the gap” to support licensing aspects by validating the code with benchmarking data.

The Influence of Heat Treatment upon Fiber Pull-Out in a Ceramic Composite

1988 ◽  
Vol 120 ◽  
Author(s):  
M. D. Thouless ◽  
O. Sbaizero ◽  
E. Bischoff ◽  
E. Y. Luh
Keyword(s):  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Shear Lag ◽  
Weibull Statistics ◽  
Pull Out ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

AbstractThe toughness of ceramic-matrix composites is strongly influenced by fiber pull-out. The extent of the pull-out depends upon the properties of the fiber and the fiber/matrix interface. Samples of a SiC/LAS composite were subjected to different heat treatments in order to systematically vary these properties. The predicted distribution of the fiber pull-out lengths was calculated by combining a shear lag analysis with Weibull statistics for the fiber strengths. Comparison of the analysis with experiments and microstructural observations contribute to an understanding of the role of the fiber/matrix interface upon the mechanical properties.

Effect of a LZSA Glass Infiltration on the Properties of a Porous Ceramic Composite Material Derived from Polysiloxane/Al/Nb

2008 ◽  
Vol 591-593 ◽  
pp. 409-414
Author(s):  
Wilson Acchar ◽  
Marcus Diniz ◽  
Ygor Alexandre A. Fonseca ◽  
F.C.C. Costa
Keyword(s):  
Composite Material ◽  
Ceramic Composite ◽  
Porous Ceramic ◽  
Physical And Mechanical Properties ◽  
Ceramic Matrix Composites ◽  
Cost Effective ◽  
Matrix Composites ◽  
Aluminum Powders ◽  
Ceramic Composite Material ◽  
Polymer Pyrolysis

By using the active filler controlled polymer pyrolysis, new and cost-effective composite materials can be obtained. In this work, ceramic matrix composites were prepared by using this precursor route, using a polysiloxane network filled with metallic niobium and aluminum powders as active fillers. The mixtures were blended, uniaxially warm pressed, and pyrolyzed in flowing argon at 1400 °C. Porous ceramic preforms were infiltrated with a LZSA glass material, in order to improve the density of a porous composite material. The properties of the pyrolyzed composite material and the effect of the LZSA infiltration on the Al2O3-NbC-SiOC ceramic composite material were investigated. The results have showed that the infiltration processes has improved the physical and mechanical properties of the composite material.

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