Accession Number : ADA261705


Title :   Interface Engineering in Oxide Fiber/Oxide Matrix Composites


Descriptive Note : Annual rept. 1 Mar 1992-28 Feb 1993


Corporate Author : NEW MEXICO INST OF MINING AND TECHNOLOGY SOCORRO DEPT OF METALLURGICAL AND MATERIALS ENGINEERING


Personal Author(s) : Chawla, K K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261705.pdf


Report Date : 28 Feb 1993


Pagination or Media Count : 45


Abstract : 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 oxide/oxide 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.


Descriptors :   *FIBERS , *MATRIX MATERIALS , *GRAIN GROWTH , *OXIDES , THERMAL PROPERTIES , TENSILE STRENGTH , INTERFACES , COATINGS , CARBON DIOXIDE , TIN COATINGS , ROUGHNESS , ALUMINUM OXIDES , ENGINEERING , GLASS , COMPOSITE MATERIALS , DEFORMATION , SINGLE CRYSTALS


Subject Categories : Laminates and Composite Materials
      Textiles
      Metallurgy and Metallography
      Crystallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE