Effect of Sintering Temperature on Mechanical Behaviors of an Oxide Fiber‐Reinforced Oxide Matrix Composite

Abstract

Sintering temperature can significantly affect the mechanical behaviors of ceramic matrix composites. Herein, the effect of sintering temperature (900–1200 °C) on micro‐ and macromechanical properties of an oxide fiber‐reinforced oxide matrix (oxide/oxide) composite is investigated. The crack propagation path is predicted by the He–Hutchinson model. Results show that the elastic modulus of matrix and interfacial shear strength increase with sintering temperature. The propagating crack converts from deflection along the interface to direct penetration into the matrix at 1200 °C. With increase of the sintering temperature, the flexural strength and interlaminar shear strength monotonically increase, while the fracture toughness increases and then decreases at 1200 °C. A good balance between the fracture strength and fracture toughness is achieved on the 1100 °C sintered composite, which possesses a high flexural strength of ≈276.7 MPa, a high interlaminar shear strength of ≈17.2 MPa, and a high fracture toughness of ≈13.9 MPa m1/2. The study offers a new sight in deep understand of the preparation and applicability of oxide/oxide composite at high temperatures.

Framework Nucleic Acids Combined with 3D Hybridization Chain Reaction Amplifiers for Monitoring Multiple Human Tear Cytokines

“…[29][30][31] To date, HCR has been used in a wide range of applications, including bioassays, in situ imaging, and the construction of DNA nanostructures. [32][33][34][35][36][37][38][39][40] However, traditional HCR products are 1D assemblies that display relatively low amplification efficiency as well as strong background noise. [41][42] We hypothesize that high-dimensional HCR products would exhibit higher amplification efficiency and a higher signal-to-noise ratio.…”

“…[18][19][20][21][22][23][24][25][26] Additionally, HCR provides multiplexed, isothermal, enzyme-free amplification of molecular signals in diverse settings, and thus, it has been used for bioassays, in situ imaging, and the construction of DNA nanostructures. [27][28][29][30][31][32][33][34][35][36][37][38][39][40] However, their application in tear analysis remains a gap. In this work, we leveraged DTFs to effectively capture 3D-HCR products with controllable multibranched arms.…”

“…The assembly of 3D-HCR products was triggered by a specific cytokine. In contrast to conventional 1D HCR assemblies with uncontrollable multibranched arms, which displayed a relatively low amplification efficiency, [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] the constructed 3D-HCR products showed an 11.0-fold enhancement of electrochemical signals. As a result, the constructed 3D-HCR enabled the sensitive detection of MMP-9, IFN-𝛾, IL-6, and TNF-𝛼 with limits of detection of 100, 1, 1, and 0.1 pg mL −1 , consuming only 3 mL of tears.…”

Microstructure and Mechanical Properties of a Three‐Dimensional Oxide/Oxide Composite after Long‐Term Thermal Exposure

“…The damage tolerance of the thermally aged composites would hence be expected to decrease. [27] A push-in test was performed on a single fiber to quantitatively determine the effect of thermal aging on the interfacial bonding between the fiber and matrix; the results are shown in Figure 5. To our knowledge, this was the first study of its kind on oxide/oxide composites subjected to long-term thermal aging.…”