WEDM Studies on TiB2-15% SiC Ceramic Composite Processed Through SPS Process

The objective of the study is to predict the optimized set of the input parameters for the machining of non-conductive silicon carbide (SiC) by electric discharge machining (EDM). The insulated SiC ceramic composite machining was performed with 4 volumes (by percentage) of carbon nano (CNT) the SiC, which makes it electrically conductive. SiC has very good mechanical properties due to its widespread application in the aerospace, MEMS, and bio-sensor industries. This application requires a highly precise machining hole with a good surface quality that can be processed by machining processes such as EDM. The input parameters in this study are differing by three levels and the experimentation has been done by L27 orthogonal array. Four output parameters such as material removal rate (MRR), plasma flushing efficiency (PFE), surface-roughness (SR) and recast layer thickness (Rlt) for has been calculated for the detailed experimental analyses. In this research, a comparative analysis between the Multi-attribute management mechanisms (MADM) i.e. WPCA, MOORA & MOORA, and WPCA was conducted. The statistical analysis was also conducted to determine the impact of input parameters on performance measures. The study concluded that by integrating MOORA 's method with a PCA, the highest MRRs of 2.56 mm3/min & 78% PFE, lowest SR 2.1 µm, and Rlt 2.56 µm were obtained, with an experimental testing error of 5 percent.

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Precursor Derived Ceramic Method to Fabricate SiC Ceramic Composite Coatings on Metallic Substrates

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.864.59 ◽

2017 ◽

Vol 864 ◽

pp. 59-64 ◽

Cited By ~ 1

Author(s):

Wei Ling Guo ◽

En Zhong Li ◽

Da Xiang Yang

Keyword(s):

Ceramic Composite ◽

Composite Coatings ◽

Ceramic Coatings ◽

The Other ◽

Ceramic Method ◽

Metallic Substrates ◽

Advantages And Disadvantages ◽

Sic Ceramic ◽

Development Direction ◽

Al Powder

In this paper, the polymer precursor derived ceramic (PDC) method, that was used to fabricate the silicon carbide (SiC) ceramic composite coatings on metallic substrates, was briefly summarized. Two different fabrication mechanism of ceramic coatings by PDC method were mainly introduced. One was that Al powder as the active fillers converted into AlN due to the action with N2. The other was that Al powder as the active fillers converted into Al2O3 due to the action with O2. So fabrication mechanism of ceramic coatings by PDC method would be still the research focus in the future. Compared with the other methods, the advantages and disadvantages of PDC method preparing ceramic coatings were displayed. According to the existent problems and future development direction of PDC method, the key research objectives were presented.

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Processing of Polymeric Precursor, Ceramic Matrix Composites

MRS Proceedings ◽

10.1557/proc-120-157 ◽

1988 ◽

Vol 120 ◽

Cited By ~ 4

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.

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Multi-Hole Film Cooling With Integrally Woven SiC-SiC Ceramic Wall Panels

Heat Transfer: Volume 3 ◽

10.1115/ht2005-72037 ◽

2005 ◽

Author(s):

Jayesh M. Mehta ◽

Dale Shouse ◽

Craig Neuroth ◽

Dave Marshall ◽

Brian Cox

Keyword(s):

Film Cooling ◽

Ceramic Composite ◽

Ceramic Matrix Composite ◽

Small Diameter ◽

Coupled Heat Transfer ◽

Sic Ceramic ◽

Current Design ◽

Cooling Air ◽

Combustor Liner ◽

Super Alloy

This paper presents numerical analyses of coupled heat transfer for multi-hole cooling of an integrally woven ceramic matrix composite, suitable for use in a combustor liner. The results indicate potential benefit in expanding the current design space for the combustor liners to include shallow film injection angles, very small diameter film holes, and a film injection scheme that features opposing cooling jets. These features can be conveniently produced in integrally woven SiC-SiC ceramic composite panels to yield film effectivenesses that are significantly higher than the current technology that is based on super alloy panels. This has the potential for significant cooling air saving that can be re-introduced in the combustor dome region and result in lower NOx emissions.

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