Effect of the Y₂O₃ Concentration in YSZ on the Thermophysical Property as a Thermal Shielding Material

Abstract

The effect of the Y 2 O 3 concentration in yttria-stabilized zirconia (YSZ) on the thermophysical property of porous YSZ was studied. The specific heat capacities (C p ), the thermal diffusivity (a), the apparent density (r) of a 3 mol% Y 2 O 3 /97 mol% ZrO 2 (3YSZ), and an 8 mol% Y 2 O 3 /97 mol% ZrO 2 (8YSZ) were measured. The 8YSZ's C p was lower than that of the 3YSZ. When the YSZs were dense, the 3YSZ's a value by a phonon decreased with an increase in the temperature, whereas that of the 8YSZ was almost constant over a wide temperature range. When the YSZs were porous, the 8YSZ's a value by the phonon was greater than that of the 3YSZ's.

Porous YSZ Ceramics Reinforced by Different Kinds of Fibers

“…Yttria‐stabilized zirconia (YSZ) is an excellent ceramic material with high mechanical strength, chemical stability, high temperature stability, and low thermal conductivity so that it is widely used as heat insulation material for aerospace crafts . Furthermore, introducing pores into the zirconia ceramics can obviously decrease thermal conductivity because air trapped in the pores is a better thermal insulator.…”

Supercritical-Pressure Light Water Cooled Reactors

“…A number of studies have been made on the fabrication of YSZ in which the pore former sintering temperature and micro-structure were controlled (Sasaki et al 2009(Sasaki et al , 2010. The requirements for the thermal insulating materials are low heat conductivity, small neutron absorption, and good mechanical strength and dimensional stabilities.…”

Processing-structure-property relationships in electron beam physical vapor deposited yttria stabilized zirconia coatings

“…These alloys have the required combination of strength and toughness at high temperatures, and progressive superalloy development has ensured a continuous increase in their high temperature capability. 17 There have also been numerous reports on investigation of YSZ coating structure, [18][19][20] adhesion, 21 thermal properties, 22,23 thermal cycling behavior, 9 and mechanical and tribological properties 7,24-27 as well as corrosion behavior. With the advent of surface modification methods, it is now widely accepted that the most promising approach to further increase the operating temperature is by the use of a thermal barrier coating ͑TBC͒.…”