Abstract
ABSTRACT The yttria stabilized zirconia ceramics (Y-TZP) are known for their high fracture toughness and high strength. Due to their excellent mechanical properties, the thin zirconia tapes can possess extraordinary behavior – extreme flexibility. In the present work, we introduce an adaptation of gel-tape casting method for the preparation of thin, high-strength zirconia tapes from water-based suspensions. Fine ceramic powder with a particle size of around 100 nm was used. The negative effect of sodium ions on the strength and toughness of sintered ceramic samples was revealed and explained. Ceramic tapes with a thickness of 190 µm with as-sintered surfaces reached a characteristic biaxial strength of 1805 MPa. The huge elastic deformation of ceramic tapes was demonstrated in a 3- point bend test, and a bending radius of 25 mm for a 75 µm thick tape was reached.
Highlights
Thin self-supporting ceramic tapes with the thickness in the range from tens to hundreds of microns are used in many industrial applications
Tetragonal zirconia stabilized with 3 mol% Y2O3 (3Y-TZP) has become the most used zirconia ceramic because it exhibits the best combination of toughness and strength [13,14,15]
Even though the better results in terms of particle size distribution were found in the systems stabilized with Na-PAA, we used both the suspension stabilized with Na-PAA and the suspension stabilized with PC 75 for further prepara tion of the ceramic tapes
Summary
Thin self-supporting ceramic tapes with the thickness in the range from tens to hundreds of microns are used in many industrial applications (ceramic barrier layers [1,2,3,4], sensors [5,6,7], and flexible substrates [8,9]). Tetragonal zirconia stabilized with 3 mol% Y2O3 (3Y-TZP) has become the most used zirconia ceramic because it exhibits the best combination of toughness and strength (typically 5–6 MPa m1/2 and more than 1 GPa) [13,14,15]. Low Young’s modulus, high fracture toughness and corresponding high strength make the 3Y-TZP ceramic a suitable material for the prepara tion of extremely flexible ceramic tapes [5,16] with applications in electronics as chemically, thermally, and mechanically resistant substrates. No large elastic deformation of ceramic products can com monly be observed, theoretical calculations show that a relatively high flexibility of thin ceramic sheets can be obtained [17]. To demonstrate the flexibility of ceramic tapes, we can calculate the radius of maximal curvature for the 3Y-TZP sheet [17]. In the case of pure bending, the maximum radius of curvature, r, can be determined according to the simple equation:
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