Toughening of commercial 85 wt.% Al2O3 by controlled heat treatments

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Details zur Publikation

Autorinnen und Autoren: Travitzky N
Zeitschrift: Materials Science and Engineering
Verlag: Elsevier BV
Jahr der Veröffentlichung: 1985
Band: 71
Seitenbereich: 65-70
ISSN: 0025-5416


In order to evaluate the relative importance of various heat treatment parameters on the mechanical behaviour of commercial 85 wt.% AlO (AD-85) it was decided to establish a three-dimensional matrix of test results based on three parameters varied within set limits. The three parameters chosen were (1) the solution treatment temperature which was varied from 1400 to 1600°C, (2) the stress relief (annealing) temperature which was varied from 750 to 900°C and (3) the precipitation temperature which was varied from 1050 to 1200°C. All other parameters (the time of exposure at temperature, the tile thickness and the cooling rate) were kept fixed. The transverse rupture strength σ and fracture toughness K were measured Fractographic and ceramographic analyses were performed on test specimens after fracture. X-ray diffraction analysis of specimens was performed after different heat treatments. The maximum values of σ and K were obtained for specimens that were rapidly cooled after solution treatment. Smooth fracture surfaces were observed for these specimens, compared with rough fracture surfaces for specimens showing low σ and K values. The highest values of σ and K observed are of the same order as for high performance ceramics. © 1985.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Travitzky, Nahum apl. Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)

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