Accession Number : ADA264227


Title :   Design, Synthesis, and Chemical Processing of Hierarchical Ceramic Structures for Aerospace Applications


Descriptive Note : Final rept. 1 Aug 89-28 Feb 93,


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE CERAMICS PROCESSING RESEARCH LAB


Personal Author(s) : Rhine, Wendell E ; Cima, Michael J ; Bowen, H K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264227.pdf


Report Date : 30 Mar 1993


Pagination or Media Count : 218


Abstract : Ceramic materials are beginning to replace conventional materials in high temperature structural applications, but further advances are needed to improve their reliability. To analyze the complex behavior of ceramics, it is useful to consider the structure on four hierarchical levels - namely the molecular-, nano-, micro, and macroscales. Interactions at and between these various levels of structure exert important and often quite specific influences. The research conducted for this effort involved using chemical approaches to synthesize and process ceramic powders to create and control these hierarchical structures in ceramic materials. With the development of chemical approaches for synthesizing and processing ceramics, it is possible to develop synthetic and processing methods to control the molecular and nanostructure of ceramic powders. This report describes our efforts to synthesize submicron SiC, TiB2, TiC, and TiN powders, and nanocomposites from preceramic polymers. Efforts to synthesize epitaxial LiNbO3 films from alkoxide precursors are also described. Ceramic processing, Ceramic powders, Ceramic composites, Nanocomposites, SiC, TiB 2, TiN, TiC, Cordierite, A1203, A1N, Synthesis, Metal organic precursors.


Descriptors :   *STRUCTURES , *CERAMIC MATERIALS , CONTROL , METALS , TEMPERATURE , INTERACTIONS , SYNTHESIS , CHEMICALS , FILMS , CARBIDES , MINERALS , LITHIUM NIOBATES , TITANIUM BORIDE , SILICON CARBIDES , MOLECULAR STRUCTURE , ORGANIC MATERIALS , OXIDES , RELIABILITY , NITRIDES , EPITAXIAL GROWTH , POLYMERS , POWDERS , PRECURSORS , PROCESSING , COMPOSITE MATERIALS , HIGH TEMPERATURE


Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Crystallography
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE