The Effect of Quartz and Mullite Pahses on Strength of Triaxial Porcelain

Citation:
Nyongesa FW, Aduda BO. "The Effect of Quartz and Mullite Pahses on Strength of Triaxial Porcelain." East African Journal of Physical Sciences. 2004;1(5):11-24.

Abstract:

The effect of quartz and mullite crystalline phases on the strength of triaxial porcelain in the system
quartz-feldspar-kaolin composed of 20%wt silica and feldspar/kaolin ratio of 5:8 has been
investigated. It was found that secondary mullite crystals enhanced both the compressive strength and
elastic properties of porcelain by the interlocking mechanism. Excess glass formation decreased the
fracture strength of porcelain as a result of the combined effect of circumferential cracks around
quartz grains and the microcracks within the quartz grains. The circumferencial cracks due to the
difference in the thermal expansion coefficient mismatch between the glassy and the quartz phases,
whereas the microcracks were due to a- to b- quartz phase inversions.

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