TY  - JOUR
AU  - HUANG, Ze
AU  - DENG, Chengji
AU  - DONG, Bo
AU  - YU, Chao
AU  - DING, Jun
AU  - ZHU, Qingyou
AU  - ZHU, Hongxi
AU  - WANG, Yibo
PY  - 2024
TI  - Preparation and Properties of Mullite Fiber Reinforced Oxide Porous Ceramics
JO  - Journal of Ceramics
SN  - 2095-784X
SP  - 508
EP  - 514
VL  - 45
IS  - 3
AB  - Fly ash cenospheres, feldspar powder and alumina powder with various specifications were utilized as the raw materials and mullite fibers were introduced as a reinforcing phase to fabricate porous ceramics. The effect of mullite fiber on properties of the porous ceramics and the mechanism were studied. It is indicated that the incorporation of low-melting phases from feldspar powder at high temperatures was employed to reduce the eutectic point of materials, transforming the physical interface between the matrix phases into a chemical bond. An increase in mullite fiber content led to rise in closed porosity of the porous ceramics after sintering at 1100 ℃. Simultaneously, room-temperature compressive strength and bulk density initially increased and then decreased with rising content of mullite fiber. Optimal comprehensive performance was achieved when the mullite fiber content was 10 wt.%, resulting in a volume density of (0.74±0.01) g·cm-3, a true porosity of (72.70±0.58)%, and a room-temperature compressive strength of (7.30±0.64) MPa. In addition, average thermal conductivities of the specimens at 300 ℃, 600 ℃ and 900 ℃ were 0.202 W·m-1·K-1, 0.214 W·m-1·K-1 and 0.244 W·m-1·K-1, respectively.
UR  - https://doi.org/10.13957/j.cnki.tcxb.2024.03.009
DO  - 10.13957/j.cnki.tcxb.2024.03.009