The failure of plasma-sprayed thermal barrier coatings (TBCs) during service is usually related to the cracking behavior. In this study, TBCs were prepared with two kinds agglomerated sintered yttria-stabilized zirconia (YSZ) powders different particle sizes. evolution mechanical properties and crack propagation behavior whole life stage studied by a shock test. effect powder size on was analyz...

Cermets are ceramic metal composites. The metallic phase in the cermet typically undergoes oxidation during sintering air. Electric field-assisted processes such as technology/spark plasma (FAST/SPS) and flash involves very high heating rates, short processing time low temperature. main aim of this work was to see if techniques can prevent cermet. Sintering behavior 8YSZ-5 wt.% Ni studied by th...

Micro-compression tests were carried out on pillars of 60 ?m in diameter, milled by plasma focused ion beam porous Yttria-Stabilized Zirconia (YSZ) pellets. The fracture properties determined over a wide range porosities (33 %–63 %) for 8YSZ and at given pore volume fraction 63 % 3YSZ. mechanical from testing reproducible thanks to the homogeneity microstructures. Young’s modulus was estimated ...

an attempt was made to investigate the thermal and residual stress distribution in a novel three layer (la 2 zr 2 o 7 / 8ysz/ nicraly) during a real-like heating regime which includes heating, service time and final cooling. for achieving maximum accuracy and consistency in calculation of thermal and mechanical properties of hybrid coating system, all related andrequired properties were introdu...

The relevance of the phase-field approach to simulate fracture in porous ceramics has been investigated. For this purpose, conditions for crack initiation using model have compared theoretical predictions coupled criterion considering a pure V-notch singularity and blunted by cavity. two types (3YSZ 8YSZ), it shown that is able accurately nucleation as predicted stress-energy criterion. nature ...

Abstract: Zirconia solid electrolytes with nonequilibrium composite structure were prepared by impregnation of a porous 8YSZ matrix with a solution of Zirconia. Microstructures were characterized by XRD and SEM. The electrical properties were studied by impedance spectroscopy as a function of temperature. Biaxial flexural strength and fracture toughness of composite samples were measured by rin...

In this study, the effects of calcination and milling of 8YSZ (8 mol% yttria stabilized zirconia) used in the nickel-YSZ anode on the performance of anode supported tubular fuel cells were investigated. For this purpose, two different types of cells were prepared based on a Ni-YSZ/YSZ/Nd2NiO4+δ-YSZ configuration. For the anode preparation, a suspension was prepared by mixing NiO and YSZ in a ra...

In this paper, a novel concept in the field of phase composite ceramics has been proposed and applied for creating topcoats durable thermal barrier coatings (TBCs), which is one most critical technologies advanced high-efficiency gas turbine engines extreme environments. The ceramic TBCs were designed to demonstrate superior comprehensive performance-related merits, benefits, advantages over co...