Deformation and bending strength of high‐performance lead‐free piezoceramics

Abstract

Bending strength of commercially relevant lead-free piezoceramics -0.935Na 0.5 Bi 0.5 TiO 3 -0.065BaTiO 3 (NBT-6.5BT) with and without acceptor Zn-doping and 0.92(K 0.5 Na 0.5 )NbO 3 -0.02(Bi 0.5 Li 0.5 )TiO 3 -xBaZrO3; x = 0.06, 0.07 (KNN-BZ100x) have been quantified using 4-point bending tests and contrasted to that of commercial lead zirconate titanate (PZT, PIC151). The compressive and tensile strength probed using additional strain gauges under 4-point bending indicate negligible non-linear deformation, in stark contrast to that of commercial PIC151. The bending strength of KNN-BZ100x is about 100 MPa, comparable to PIC151, while that of NBT-6.5BT-based materials is about twice that of PIC151 at ∼160 MPa. These results are rationalized based on the intrinsic characteristics of the lead-free piezoceramics in terms of fracture toughness, coercive stress, and Young's modulus. Weibull statistics indicate a higher fracture probability for KNN-based materials, with NBT-6.5BT-based materials featuring Weibull modulus twice that of KNN-based materials.

Rheological, mechanical, and electrical properties of Sr0.7Bi0.2TiO3 modified BaTiO3 ceramic and its composites

“…When the content of ceramic filler was 45 wt.%, the obtained composites showed ∼20 times increase in modulus and microhardness compared with pure epoxy resin. Moreover, the modulus and microhardness increased accordingly with the increase of solid‐phase content 61 . This indicates that the addition of ceramic fillers can effectively transfer the stress to improve the microscopic partial mechanical response 57 .…”

“…Moreover, the modulus and microhardness increased accordingly with the increase of solid-phase content. 61 This indicates that the addition of ceramic fillers can effectively transfer the stress to improve the microscopic partial mechanical response. 57 As a result, it can be obtained that the micromechanical properties of the complexes are all improved, which is consistent with the above macro mechanical results.…”

Remarkable flexibility in freestanding single-crystalline antiferroelectric PbZrO3 membranes

“…Usually, the maximum bending strain for bulk ceramics is only 0.2% ~0.4% 37,38 . Here, it is far beyond 1% for freestanding PbZrO 3 , which is one order of magnitude larger than the bulk ceramics.…”

Process Analysis of DLP Photocuring 3D Printing with Modified High-strength Resin

“…Bending strength refers to the maximum stress that the material can bear when breaking or reaching the specified bending moment under the action of bending load [17] . This stress represents the maximum normal stress experienced during bending and is used as a measure of the material's bending performance [18] . Figure 5 illustrates the influence of different graphene oxide content on the bending strength of samples.…”