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Mechanical strength of cold-sintered zinc oxide under biaxial bending

Lowum, Sarah, Floyd, Richard, Bermejo, Raul, Maria, Jon-Paul
Journal of materials science 2019 v.54 no.6 pp. 4518-4522
Raman spectroscopy, Weibull statistics, X-ray diffraction, ceramics, cold, strength (mechanics), zinc acetate, zinc oxide
Zinc oxide is densified to 97% by the cold sintering process using an aqueous zinc acetate solution as the secondary transport phase. The mechanical response of the cold-sintered zinc oxide ceramics is investigated through the ball-on-three-balls biaxial bending technique. The analysis demonstrates that ZnO cold-sintered samples follow a Weibull distribution with a characteristic strength (σ₀ ~ 65 MPa) and Weibull modulus (m ~ 8). Phase purity and residual secondary phases were analyzed via X-ray diffraction and Raman spectroscopy. This report provides an initial demonstration of the mechanical properties of cold-sintered parts in the as-pressed and unmodified state and serves for comparison with conventionally prepared ceramics.