Environmental reliability and crack propagation resistance of 3d-printed ALD-coated nano-ceramics

Conference Dates

October 2 – 7, 2022


3D-printed micro- and nano-architected ceramic metamaterials currently emerge as a class of lightweight materials with exceptional strength and stiffness. However, their application is hampered by the lack of knowledge of their mechanical reliability. Recently, the sensitivity of nano-ceramics’ crack propagation resistance to environmental conditions, triggered by the unavoidable presence of surface flaws introduced by the TPP-DLW 3D printing and pyrolization post-processing, has been evidenced [1], with a reduction of 20% in the average fracture toughness value reported at high relative humidity levels of testing (𝑅𝐻 ൐ 60%) from the generally performed low-humidity-based testing.

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