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TECHNICAL PAPERS: Gas Turbines: Ceramics

Design, Fabrication, and Testing of Ceramic Joints for High Temperature SiC/SiC Composites

[+] Author and Article Information
M. Singh

Dynacs Engineering Co. NASA Glenn Research Center Cleveland, OH 44135

E. Lara-Curzio

Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge, TN 37831

J. Eng. Gas Turbines Power 123(2), 288-292 (Oct 01, 2000) (5 pages) doi:10.1115/1.1362664 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

Messler, Jr., R. W., 1993, “Joining of Advanced Materials,” Butterworth-Heinemann, Boston, MA.
Schwartz, M. M., 1994, “Joining of Composite Matrix Materials,” ASM International, Materials Park, OH.
Fragomeni J. M., and El-Rahaiby S. K., 1995, “Review of Ceramic Joining Technology,” Rept. No. 9, Ceramic Information Analysis Center, Purdue University, Indiana.
Krenkel,  W., Henke,  T., and Mason,  N., 1997, Key Eng. Mater., 127–131, pp. 313–320.
Singh,  M., Kiser,  J. D., and Farmer,  S. C., 1997, Ceram. Eng. Sci. Proc., 18, No. 3, pp. 161–166.
Singh, M., and Kiser, J. D., 1997, ‘Physics & Process Modeling and Propulsion R&T Conference,’ NASA CP-10193 5:1–10.
Singh,  M., 1997, Scr. Mater., 34, No. 8, pp. 1151–1154.
Singh,  M., 1997, Ind. Heat., 9, pp. 91–93.
Singh,  M., 1998, J. Mater. Sci. Lett., 17, No. 6, pp. 459–461.
Singh,  M., 1998, J. Mater. Sci., 33, pp. 5781–5787.
Singh,  M., 1998, Adv. Mater. Proc., 10, pp. 89–90.
Singh,  M., 1999, Key Eng. Mater., 164, pp. 415–420.
ASTM C 1292, “Test method for shear strength of continuous fiber-reinforced advanced ceramics at ambient temperatures,” American Society for Testing and Materials, Conshohocken, PA (1996).
Lara-Curzio, E., and Ferber, M. K., “Shear Strength of Continuous Fiber Reinforced Ceramic Composites,” in Thermal and Mechanical Test Methods and Behavior of Continuous Fiber Ceramic Composites, ASTM STP 1309M. G. Jenkins, S. T. Gonczy, E. Lara-Curzio, N. E. Ashbaugh, and L. P. Zawada, Eds., American Society for Testing and Materials, Philadelphia, PA (1996).
Singh, M., and Lara-Curzio, E., unpublished work (1999).
Carroll,  D. F., and Tressler,  R. E., 1988, J. Am. Ceram. Soc., 71, No. 6, pp. 472–477.

Figures

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Photograph showing components fabricated by joining fiber-reinforced silicon carbide matrix composite subelements
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Schematic of a joint design map where the shear and normal stresses have been normalized by the virgin isothermal joint strengths. The envelope defines the strength of the joint.
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Schematic of tubes joined to a manifold where stresses in the joint regions involve multiaxial states of stress. (e.g., normal plus shear stresses).
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Schematic of a joint design map where the design envelope shrinks due to a degradation of strength with time
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Schematic of the double-notched shear specimen
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Schematic of the process for joining of fiber-reinforced silicon carbide matrix composites
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Schematic of fixture used for the compression of double-notched specimens at elevated temperatures
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(a) and (b) Photographs of double-notched joint specimens
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Typical shear stress versus cross-head displacement curves obtained from the compression of double-notched joint specimens at high temperatures
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Optical micrograph of fracture surfaces of joined CVI SiC/SiC composites tested at 1200°C
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Temperature dependence of apparent shear strength for joined SiC (CG-Nicalon™)/C/CVI-SiC composites
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Results from the shear stress-rupture evaluation of joints at 1200°C. The data point at the shortest time corresponds to the “virgin” shear strength of the joints.

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