Effect of mechanical prestress on the dielectric strength of alumina

Jouini, Zenjebil; Malec, David; Valdez-Nava, Zarel

doi:10.1109/icd.2016.7547808

Cited by 2 publications

(1 citation statement)

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“…Tomaszewski [21] attributed the reduction to the micro-cracks generated by the mismatch between the alumina matrix and the crystalline inter-granular phases. Jouini et al [23] found that the microcracks induced by pre-stress led to a reduction in the DBS of an alumina ceramic. Annealing decreased the bending strength of B95, while the quenching which followed annealing recaptured the bending strength, as shown in Fig.…”

Section: Analyses Of the Underlying Mechanisms Behind The Effects Omentioning

confidence: 99%

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

Tang

Liu

et al. 2020

J Adv Ceram

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Annealing and firing in wet hydrogen are widely used steps in the processing alumina-ceramic insulators that may affect their dielectric breakdown strengths (DBS). In this study, the effects of annealing (at 1300 ℃ for 7 h) and firing in wet hydrogen on the DBS of alumina ceramics (all sintered at 1650 ℃) were studied, and the underlying mechanisms were analyzed by material characterizations. Annealing reduced the DBS of the 95% alumina ceramics due to the inter-granular phase crystallization, and the reduction in the DBS could be correlated to the reduction in mechanical strength. In contrast, annealing improved the DBS of the 99% alumina ceramic without intergranular phase transformation. Firing in wet hydrogen at 1500 ℃ caused the DBS increment, which can be ascribed to the reduction in the concentrations of point defects and electrical carriers.

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Section: Analyses Of the Underlying Mechanisms Behind The Effects Omentioning

confidence: 99%