High temperature tensile strength of large size Al2O3/ZrO2(Y2O3) directionally solidified eutectic ceramics

Nanocrystalline Alumina-Zirconia-Based Eutectic Ceramics Fabricated with High-Energy Beams: Principle, Solidification Techniques, Microstructure and Mechanical Properties

“…Sayir et al [34] proved that the Al 2 O 3 -YSZ nanoeutectic ceramic does not exhibit steep strength losses at elevated temperatures of up to 1500 • C, which can be attributed to the nanostructuring effect induced by the increasing pulling rate. Zhai et al [7] found that the value of 1500 • C tensile strength of Al 2 O 3 -YSZ eutectic ceramics increased dramatically from 55.2 MPa to 94.3 MPa, with decreasing interphase spacing from 5.2 to 2.2 µm. The room-temperature tensile strength was 172.2 MPa, with an interphase spacing of 4.6 µm.…”

“…In the case of eutectic ceramics, a relatively systematic investigation was originally published in the early 1960s, and considerable research has been dedicated to the microstructures and properties of eutectic ceramics. Among a large number of eutectic ceramics with attractive properties, a particular interest has been shown in oxide-oxide systems in which alumina-based eutectic in situ composites have attracted extensive attention for potential applications in ultrahigh-temperature structural-functional materials or advanced protective coatings due to their superior specific strength, stiffness and intrinsic thermal stability up to 1773 K near their melting points under an oxidizing atmosphere [1][2][3][4][5][6][7][8].…”

Microstructural Stability and High Temperature Strength of Directionally Solidified Al2o3/Er3al5o12/Zro2 Eutectic Ceramics

“…The DSEC rods were processed into 3 × 4 × 36 mm 3 rectangular samples with a diamond wire slicer (SYJ-50, Shenyang Kejing Cutting Machine) for the measurement of the flexural strength [13], and into dumbbell shaped samples with a total length of 49 mm with cylindrical grinder (H206, Shanghai Machine Tool Factory) for the measurement of the tensile strength [14]. The size and shape of the two kinds of samples are shown in Fig.…”

“…The defect is the main reason for this strength difference, which is easy to become the source of crack formation, leading to the reduction of strength. The quantity of defect is proportional to the size of the sample [14]. The size of the samples prepared by the high frequency induction zone melting method, similar to that by the Bridgman method, is much larger than that prepared by µ-PD method or laser zone melting method, so their strengths are lower than those prepared by µ-PD method or laser zone melting method.…”