Interface Engineering in Oxide Fiber/Oxide Matrix Composites
Annual rept. 1 Mar 1992-28 Feb 1993
NEW MEXICO INST OF MINING AND TECHNOLOGY SOCORRO DEPT OF METALLURGICAL AND MATERIALS ENGINEERING
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We have shown in earlier work that fiber roughness is a very important parameter along with the thermal mismatch between the components. PRD- 166 fiber, used so far, is a very rough fiber. Saphikon, single crystal alpha- alumina, is a relatively smooth fiber, but very expensive due to its processing cost. A new polycrystalline alumina fiber, Nextel 610, has recently become available. Due to its smoother surface than that of PRD-166 fiber, this fiber can be a good reinforcement candidate in oxideoxide composites. We have done microstructural and mechanical characterization of Nextel 610 fiber. The tensile strength of Nextel 610, after exposure to 900-deg C, 1100 deg-C, and 1300-deg C was determined using a two-parameter Weibull distribution. It was observed that the primary reason for the loss of the fiber strength was the grain growth.
- Laminates and Composite Materials
- Metallurgy and Metallography