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Grossmann , J.; Emmel , A.; Schubert , E.; Bergmann , H. (1993)
Publisher: HAL CCSD
Languages: English
Types: Article
Subjects: [ PHYS.HIST ] Physics [physics]/Physics archives
The chemical, structural and topographical changes after the irradiation of technical oxide (Al2O3, ZrO2) and nonoxide ceramics (SiC, Si3N4) with a XeCl-Excimer Laser were studied as function of the applied energy density and number of pulses. The silicon-based nonoxide ceramics decomposed during a temperature and pressure induced process and an adherent up to 1,5 ┬Ám thick crystalline Si-layer remained on top of the specimen surface. In contrast, the oxide ceramics underwent a melting and rapid resolidification process without a chemical alteration. The minimization of surface defects on Al2O3 was used to generate a two-fold increase in Weibull's modulus m compared with untreated samples, whereas the silicon layer on top of SiC was helpful to generate and improve metal-ceramic joints between SiSiC and AlMgSi l.
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    • displacement the load displacement curves and the slopes approached each other, respectively (iii) the hardness versus displacement curves and the SEM observations were in good agreement with hardness measurements of amorphous Al20,[4I, which supported the assumption that the Excimer Laser treatment generated an amorphous A120, top layer.
    • Consequently, Young's Modulus was reduced to approximately 200 CPa compared with 400 GPa for the untreated material.
    • The reduction and elimination of surface defects on the alumina surfaces resulted in an increase in reliability. As an example, Weibull's Moduls m underwent a two-fold increase from m = 7,8 for the untreated material to m = 16 for the irradiated A1,0, (30 mJ/mm2, 16 pulses) of 96% purity.
    • With respect to the standard deviation, these effects are independent of the alumina purityrs1.
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