Effects of Addition of Polyacrylic Ammonium on Dissolution of α-Alumina in Solutions Containing Mg&lt;sup&gt;2+&lt;/sup&gt; Ions

SiC particles coated uniformly with Al ions (0.25 mass% Al2O3) in an aluminum nitrate solution were consolidated by filtration through a gypsum mold. Hot-pressing in vacuum gave dense SiC (above 99% relative density) in the temperature range of 1900–1950 °C under a pressure of 39 MPa. The microstructures of dense SiC consisted of 2–5 μm grains of low aspect ratios (below 2). The fracture toughness and flexural strength of SiC increased gradually as the hot-pressing temperature became higher and were 4.3 Mpa m0.5 and 350 MPa, respectively, with hot-pressing at 1950 °C. Crack propagation in SiC shifted from intergrain to intragrain with increasing hot-pressing temperature.

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Electrical Properties, Rheology and Packing Density of Colloidal Alumina Particles

Hirata

Wang

Hatate

et al. 2003

J. Ceram. Soc. Japan

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The mobility of positively and negatively charged alumina particles in concentrated suspensions was ana lyzed with monitoring the electrical conductivity of the suspensions. The decreased mobilityiu jat a lower chargeiQ jwas due to increased attractive interaction. The increase of volume fraction of moderately charged particles resulted in the decrease of u value because of the increased repulsive interaction with decreased interparticle distance. Too strong repulsive interaction between highly charged particles sup pressed the migration of dispersed particles. The mobility of negatively charged particles was lower than that of positively charged particles at a similar Q value because of a stronger eect of chemical bonding be tween hydrated particle surface. The apparent viscosity of acidic suspensions was lower than that of basic suspensions. This result was also discussed based on three important eects of charge, concentration and nature of hydrated surface of alumina particles. The green densities of alumina compacts consolidated by ltration through gypsum molds were higher for the acidic suspensions than for the basic suspensions.

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Effects of Addition of Polyacrylic Ammonium on Dissolution of α-Alumina in Solutions Containing Mg<sup>2+</sup> Ions

Cited by 3 publications

References 1 publication

Reaction between SiC surface and aqueous solutions containing Al ions

Reaction between SiC surface and aqueous solutions containing Al ions

Sinterability of SiC powder coated uniformly with Al ions

Electrical Properties, Rheology and Packing Density of Colloidal Alumina Particles

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