Rig and Engine Testing of Melt Infiltrated Ceramic Composites for Combustor and Shroud Applications

Corman, Gregory S.; Dean, Anthony J.; Brabetz, Stephen; Brun, Milivoj K.; Luthra, Krishan L.; Tognarelli, Leonardo; Mario, Pecchioli,

doi:10.1115/2000-gt-0638

Cited by 15 publications

(13 citation statements)

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“…Silicon carbide fiber‐reinforced silicon carbide (SiC/SiC) ceramic matrix composites (CMCs) possess excellent properties such as high strength and toughness, high thermal conductivity, excellent creep resistance, and good environmental stability (oxidation resistance). These materials could be applied at high temperature in aerospace applications such as aerojet engines, thermal protection, gas turbines, and hot control surfaces . The benefits of these materials are reduced cooling air requirements, lower weight, simpler component design, longer service life and high thrust .…”

Section: Introductionmentioning

confidence: 99%

Correlating Electrical Resistance Change with Mechanical Damage in Woven SiC/SiC Composites: Experiment and Modeling

Sujidkul

Smith

et al. 2014

J. Am. Ceram. Soc.

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Silicon carbide (SiC) fiber‐reinforced SiC matrix composites are inherently multifunctional materials. In addition to their primary function as a structural material, the electric properties of the SiC/SiC composites could be used for the sensing and monitoring of in situ damage nucleation and evolution. To detect damage and use that information to further predict the useful life of a particular component, it is necessary to establish the relationship between damage and electrical resistance change. Here, two typical SiC/SiC composites, melt infiltrated (MI), and chemical vapor infiltrated (CVI) woven SiC/SiC composites, were tested to establish the relationship between the electrical response and mechanical damage in unload–reload tensile hysteresis tests. Compared to the 55% resistance increase seen for CVI composites, the MI SiC/SiC composites exhibit a maximum resistance change in 450% in response to mechanical loading (damage), which is the highest sensitivity known among various composites. An analytic model accounting for fiber breakage and matrix cracks was developed to link the electrical resistance to mechanical damage in the composites. The predictions from the models agree well with the experimental data for both composites with high and low conductive matrices. The residual resistance change after unloading is also correlated to the loading history by the analytical relationship. This study demonstrates that resistance change is sensitive to damage in a predictable manner and can be used to improve the reliability of damage assessment of SiC/SiC composites.

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Section: Introductionmentioning

confidence: 99%

Correlating Electrical Resistance Change with Mechanical Damage in Woven SiC/SiC Composites: Experiment and Modeling

Sujidkul

Smith

et al. 2014

J. Am. Ceram. Soc.

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“…SiC/SiC composites exhibit high thermal conductivity, excellent creep resistance, low density, good toughness, and good environmental stability (oxidation resistance). These properties make them suitable for hot‐section components of gas turbines, 2,3 aerojet engines, 4 thermal protection systems, 5 and hot‐control surfaces 6 . The advantages of using CMCs in these areas would be reduced cooling air requirements, lower weight, simpler component design, longer service life, and higher thrust 7 …”

Section: Introductionmentioning

confidence: 99%

Electrical Resistance as a Nondestructive Evaluation Technique for SiC/SiC Ceramic Matrix Composites Under Creep‐Rupture Loading

Smith

Morscher

Xia

2010

Int J Applied Ceramic Tech

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SiC/SiC ceramic matrix composites under creep-rupture loading accumulate damage by means of local matrix cracks that typically form near a stress concentration, such as a 901 fiber tow or a large matrix pore, and grow over time. Such damage is difficult to detect through conventional techniques. This study demonstrates that electrical resistance is a viable method of monitoring and inspecting damage in SiC/SiC composites at high temperature. Both interrupted and uninterrupted creeprupture experiments were performed at 13151C and 110 MPa with in situ resistance measurements. A linear relationship was found between resistance and cumulative crack depth.Ã Specimen did not break.w Thermal mechanical fatigue (unloaded and cooled to room temperature at 1 and 5 h).z Inadvertent overload to 160 MPa while cooling.

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“…The matrix was formed by melt infiltration (Heidenreich, 2008). The material was supplied to the authors on the condition that analytical techniques would not be used to determine its composition; however, the literature indicates that the fibers would be coated with a layer of boron nitride (BN) (Corman et al, 2002). For the tensile test, 3 cm × 4 mm strips were cut from the sheet with a diamond saw.…”

Section: Methodsmentioning

confidence: 99%

Failure Evaluation of a SiC/SiC Ceramic Matrix Composite During In-Situ Loading Using Micro X-ray Computed Tomography

et al. 2019

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In this study, we have examined ceramic matrix composites with silicon carbide fibers in a melt-infiltrated silicon carbide matrix (SiC/SiC). We subjected samples to tensile loads while collecting micro X-ray computed tomography images. The results showed the expected crack slowing mechanisms and lower resistance to crack propagation where the fibers ran parallel and perpendicular to the applied load respectively. Cracking was shown to initiate not only from the surface but also from silicon inclusions. Post heat-treated samples showed longer fiber pull-out than the pristine samples, which was incompatible with previously proposed mechanisms. Evidence for oxidation was identified and new mechanisms based on oxidation or an oxidation assisted boron nitride phase transformation was therefore proposed to explain the long pull-out. The role of oxidation emphasizes the necessity of applying oxidation resistant coatings on SiC/SiC.

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Rig and Engine Testing of Melt Infiltrated Ceramic Composites for Combustor and Shroud Applications

Cited by 15 publications

References 0 publications

Correlating Electrical Resistance Change with Mechanical Damage in Woven SiC/SiC Composites: Experiment and Modeling

Correlating Electrical Resistance Change with Mechanical Damage in Woven SiC/SiC Composites: Experiment and Modeling

Electrical Resistance as a Nondestructive Evaluation Technique for SiC/SiC Ceramic Matrix Composites Under Creep‐Rupture Loading

Failure Evaluation of a SiC/SiC Ceramic Matrix Composite During In-Situ Loading Using Micro X-ray Computed Tomography

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