Creep Behavior of Si₃N₄‐Whisker‐Reinforced Si₃N₄‐Matrix Composites Using anIn SituDynamic Beam Profiling Method

Abstract

A four-point flexure test, capable of simultaneously measuring load-point and beam-center displacements and permitting in situ profiling of the beam throughout the test, has been developed. Compressive and tensile strains in the outer fibers, together with the neutral axis displacement, were determined in real time for Si 3 N 4 -whisker-reinforced Si 3 N 4 -ceramic-matrix composites. Combining these data with the closed form solution of Chen and Chuang gave excellent correspondence between the creep exponents determined from flexure tests with those determined independently from tensile and compressive creep tests.

Creep Behavior of Plasma‐Sprayed Zirconia Thermal Barrier Coatings

“…Creep tests were performed at three different temperatures (800°, 1000°, and 1200°C) under a range of stresses for 2 days. The in situ dynamic beam profiling method 14 was adopted to measure the creep properties of samples.…”

Synthesis of Ceramic Nanocomposite Powders with in situ Formation of Nanowires/Nanobelts

“…In the last decades, many efforts have been devoted to improve the toughness of the ceramics. The toughening mechanisms explored can be classified into two categories: (i) intrinsic mechanism, i.e., forming interlocked elongated microstructures 3 and (ii) extrinsic mechanism, i.e., introducing second reinforcing phases such as particles, 4,5 whiskers, [6][7][8][9][10][11][12] or fibers. [13][14][15][16][17] While significant progress has been made, further improving the toughness of the ceramics is still highly desired for widening their applications.…”