Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Effects of the homogeneity of particle coordination on solid-state sintering of transparent alumina

Einflüsse der Homogenität der Partikel-Koordinierung auf das Festkörpersintern von transparentem Aluminiumoxid
 
: Krell, A.; Klimke, J.

:

Journal of the American Ceramic Society 89 (2006), No.6, pp.1985-1992
ISSN: 0002-7820
English
Journal Article
Fraunhofer IKTS ()
alumina; densification; density; grain growth; porosity; porous-material; sintering; transparency; Alpha-Aluminiumoxid; Partikel; Koordinierung; Homogenität; Grünling; Sinterverhalten; Porosität; Porengrößenverteilung; Mikrogefüge; Dichte=Masse; Verdichtung; Kornwachstum; isostatisches Pressen; Korngröße; Gelcasting-Verfahren; Dotierung=Fremdatomzusatz; Magnesiumoxid; optische Transparenz

Abstract
A quantitative assessment of the homogeneity of particle coordination in green bodies is achieved by addressing pore structures. Avoiding a coarser tail of the pore size distribution is important but insufficient for optimum sintering. Instead, the steepest slope of the main body of the distribution is responsible for a maximum density at lowest temperature, and further progress is enabled by minimizing interparticle spacing (the average pore size). Ranking different technologies with different associated pore size distributions, the same correlation holds for the impact of homogeneity on (i) sintering densification as (ii) for the onset of intense grain growth during the final sintering stage. For all of the investigated processing approaches the pore size distributions are observed to remain constant through the initial and intermediate states of sintering.

: http://publica.fraunhofer.de/documents/N-48255.html