Effect of alumina fiber content on pore structure and properties of porous ceramics

Abstract

Porous Al 2 O 3 ceramics with different contents of alumina fibers were prepared by gel-casting process. The effects of Al 2 O 3 fiber content on pore size distribution, porosity, compressive strength, and load-displacement behavior of the ceramic materials were investigated. Initial results showed that with the increase of Al 2 O 3 fiber content, the pore size and porosity of the material is increased, and the compressive strength is decreased. However, upon increasing the fiber content from 50 wt% to 67 wt%, the performance of the samples changed greatly. The compressive strength of the material increased, while the porosity remained unchanged, the pore size increased greatly, and the shape of the load displacement curve changed. It showed that when the fiber content increased from 50 wt% to 67 wt%, the loading body in the fiber-reinforced porous ceramics changed from particles to fibers. K E Y W O R D Scompressive strength, fiber, pore size distribution, porous ceramics

Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

“…where F is the exural strength (MPa), l is the span (mm) between the sample and the mold, f is the maximum stress (N) of the samples, b and h are the width (mm) and height (mm) of the sample, respectively. ,PDF#80-0886) and quartz (SiO 2 ,PDF#86-2237) as the major crystalline phases [21,24].…”

“…Mullite is a scarce ceramic material with various interesting properties in nature [11][12][13][14][15][16]. Mullite ber is often used as reinforcing material of ceramics [17][18][19][20][21]. Mullite porous ceramics not only have high stability at high temperatures, but also are used in various situations because of their abundant pore structures [17,18,[22][23][24][25].…”

Study of online tensile properties for continuous ceramic fibers under high‐temperature loads

“…It has been demonstrated that high temperatures will lead to the transformation of fiber microstructure, which will have a negatively impact on their mechanical properties. [15][16][17] However, these methods merely yield results about the residual strength of the fibers after thermal loading and tensile tests are conducted following the heat treatment. [18][19][20] Such approaches fail to reflect the actual behavior of ceramic fibers under the influence of thermal loads.…”

Fabrication of high strength and thermal insulation porous ceramics via adjusting the fiberglass contents

“…The most popular technique for improving strength of porous ceramics is fiber reinforcement. 12 Han et al 13 prepared SiC porous ceramics reinforced by mullite fibers. The results showed that compared with the SiC porous ceramics, the bending strength of the SiC porous ceramics reinforced by mullite fibers was improved significantly.…”

“…Therefore, most researchers have paid attention to the development of techniques to prepare excellent insulation properties and high‐strength porous ceramics. The most popular technique for improving strength of porous ceramics is fiber reinforcement 12 . Han et al 13 .…”