Accession Number : ADA268792


Title :   Metal/Ceramic Interfaces: Relationships Between Structure and Chemistry


Descriptive Note : Final rept. 15 Mar 89-15 Mar 92,


Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS


Personal Author(s) : Ruhle, M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a268792.pdf


Report Date : 31 Dec 1992


Pagination or Media Count : 84


Abstract : Studies have been conducted on interfaces between Al2O3, and three different metals; Nb, Pd and Ni. The objectives have been to establish orientation relationships and to understand the atomistic structure along the interface. In the case of Ni, the formation of a spinel reaction product has also been explored. For Nb/Al2O3, it has been found that the orientation relationships and the atomic arrangements depend on the temperature at which the interface was formed. Those formed at high temperature by diffusion bonding have (110) planes in the Nb parallel to the interface. There are also misfit dislocations which 'stand-off' the interface. Conversely, interfaces formed at lower temperatures by molecular beam epitaxy have (111) planes in the Nb parallel to the interface. Moreover, the misfit dislocations are located at the interface itself. The differences are attributed to diffusional effects, such as dislocation climb, that can occur at the higher temperatures.


Descriptors :   *METALS , *INTERFACES , *CERAMIC MATERIALS , LAYERS , HIGH TEMPERATURE , EPITAXIAL GROWTH , CHEMISTRY , ALUMINUM OXIDES , NIOBIUM , SPINEL , DEFECT ANALYSIS , PALLADIUM , NICKEL , MOLECULAR STRUCTURE , CHEMICAL REACTIONS , DISLOCATIONS , DIFFUSION BONDING , HIGH RESOLUTION , MOLECULAR BEAMS , ELECTRON MICROSCOPY , OXYGEN


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE