Synthesis of Hollow Yttria Partially Stabilized Zirconia (YPSZ) Fibers Using Cotton Fibers as Template

Abstract

Hollow yttria partially stabilized zirconia (8 wt% Y 2 O 3 fibers have been successfully synthesized using cotton fibers as template. Cotton fibers were first immersed into a mixed solution of Zr(NO 3 4 and Y(NO 3 3 and subsequently sintered in air at a high temperature to obtain the final YPSZ fibers. The as-prepared fibers were characterized by SEM and XRD, respectively. TG-DTG and DTA were also adopted to investigate the sintering process. The results indicated that the synthesized YPSZ fibers are hollow in centre and still retain the fibrous cotton morphologies after the complete removal of the cotton body. And these hollow fibers may have good thermal insulating properties that can be used as thermal barriers at high temperatures.

Micro-laminated ZrO2/Al2O3 Interlayer Used with Fiber-reinforced Thermal Barrier Coatings on Ni-based Superalloy

“…The molar ratio of ZrO 2 powders/ZrO 2 in the sol and Al 2 O 3 -ZrO 2 fibers/total ZrO 2 were 7=1 and 1=9, respectively. Al 2 O 3 -ZrO 2 ceramic fibers were produced by an immersion method as reported in a previous paper [13] Cotton fibers were used as template and aluminum nitrate solution (with 10 wt% zirconia nitrate) was used as immersion solution. After immersion, drying and sintering at 1200 ı C, Al 2 O 3 -ZrO 2 ceramic fibers were finally obtained.…”