Influence of handling and heating cycle on the morphology and flexural strength of glass-infiltrated alumina bars

Abstract

The main goal of the present study was to evaluate the influence of plaster stability, handling and thermal cycling on the morphology and mechanical strength of glass infiltrated alumina bars. Two different slip casting/thermal processing routes were investigated. The highest flexural strength of alumina bars from In-Ceram Alumina protocol in comparison to In-Ceram Sprint protocol was mainly due to its low drying rate and less handling. After glass infiltration and mechanical surface treatments, In-Ceram ® Sprint alumina bars presented a non-homogeneous distribution of alumina particles in the glass phase, which was the mais cause for its lower flexural strength. In both cases, it was observed a strong anisotropic growth of alumina particles after glass infiltration. Non-reproducible mechanical surface treatments is other factor that could deteriorate the mechanical strength of alumina bars.

Flexural strength evaluations and fractography analyses of slip cast mesoporous submicron alumina

“…It is known that the porosity fraction [17][18][19][20], the average pore size [14] and distributions [1], the grain morphology [8], [9], [10], the sample fabrication procedure [11], and the sample surface finish prior to bending experiments [5,9,27,28] are the critical influencing factors in determining the flexural strength of brittle ceramics. In this study, the sample fabrication procedure and the sample surface finish were kept constant.…”

“…Porous ceramics offer high surface area to volume ratio and are potentially interesting as catalyst carriers or filters for 2 molten metals and provide high temperature insulation [1][2][3]. Further, porous alumina ceramics, when infiltrated with a second phase material such as glass [4], [5], are often used in dental prosthesis applications.…”

Effect of Heat Treatment Schedules and Glass Powder Particle Size on Glass Infiltration in Porous Alumina Preforms

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] While studies have reported effect of ceramic (alumina) powder particle size on glass infiltration, very few studies have reported influence of glass powder characteristics and infiltration condition (temperature and time) on glass infiltration in sintered porous ceramic matrix. 26 This study reports work carried out to examine the influence of heating rate during glass infiltration, glass particle size and the soaking time on the infiltration behavior of lithium borosilicate glass in porous alumina preforms.…”

Effect of Pore Characteristics in Slip Cast Alumina on Glass Infiltration and Mechanical Properties of the Composites

“…23 Very few studies have been found on influence of pore characteristics specifically pore size distribution, on glass infiltration in porous alumina matrix. 24 In the present study, efforts have been made to examine the influence of starting powder particle size and the associated pore size distribution on the infiltration of lithium borosilicate glass in porous alumina matrix. Initial observations on infiltration of porous alumina produced from monomodal alumina powder particles prompted use of particle blends to obtain different pore size distributions.…”