Accession Number : ADA590186


Title :   Near Net-Shape, Ultra High Melting, Erosion Resistant Carbide/Metal Composites with Tailored Fibrillar Microstructures via the Displacive Compensation of Porosity Process


Descriptive Note : Final technical rept. 1 Feb 2006 - 30 Nov 2009


Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF MATERIALS SCIENCE AND ENGINEERING


Personal Author(s) : Sandage, Kenneth H


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA590186


Report Date : 26 Nov 2006


Pagination or Media Count : 33


Abstract : The proposed work is of significant importance to the Air Force structural materials program and will result in the understanding of novel advanced materials that are very high melting, lightweight, mechanically robust, and resistant to thermal shock. These materials are needed to significantly enhance the performance of key components in advanced jet and rocket engines, such as nozzles, valves, combustion liners, and thermal exhaust components. Among the most aggressive high-temperature environments encountered in aerospace applications exists in the throat region of a solid-fueled rocket nozzle. Nozzles used with solid, aluminum bearing fuels are exposed to supersonic impacts of molten aluminum oxide droplets at temperatures in excess of 2500 deg C. In addition to wear resistance, nozzle materials need to possess a low vapor pressure at such elevated temperatures and should exhibit good creep resistance. Owing to the rapid rise in temperature upon ignition, such nozzles must also be highly resistant to thermal shock and should possess a low coefficient of thermal expansion. For rocket nozzles and other advanced aerospace components, high-temperature, wear resistant composite materials of lower density are desired that can be fabricated in complex and near net shapes without extensive, costly machining. The capability of producing near net-shape composites with tailorable microstructures (i.e., controlled phase contents and phase shapes) is also needed to allow for enhanced thermo mechanical properties.


Descriptors :   *CARBIDES , *COMPOSITE MATERIALS , *EROSION RESISTANCE , *POROSITY , ALUMINUM OXIDES , COMBUSTION , COMPENSATION , COMPOSITE STRUCTURES , HIGH TEMPERATURE , LININGS , MECHANICAL PROPERTIES , MELTING , NOZZLES , ROCKET NOZZLES , THERMAL SHOCK , VAPOR PRESSURE


Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials
      Fluid Mechanics
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE