A B C D E F G J K L M N O P R S T U V W All
Words beginning with A
Abrasion Ceramics
Fired ceramic has the potential of being extremely hard and resistant to abrasion and wear. Special abrasion resistant ceramic products are made from highly specialized materials and fired to exacting requirements. Calcined alumina, for example, can be cast and fired to very high temperatures to produce surfaces with exceptional resistance to abrasion. Likewise, aggregates and bonding frits are employed by the abrasives industry to make all kinds of abrasive products (products designed to abrade others).
The hardness of pottery is mainly dependent on the development of aluminum silicates during firing (i.e. mullite crystals). This requires temperatures high enough to melt fluxes to allow them to dissolve quartz and other minerals. It also requires time to allow these processes to complete. Likewise the glaze components most resistant to abrasion are refractory alumina and silica, and the higher you fire the more you can get into your glaze and yet still get it to melt.
Acidic
Various oxides can be considered basic (RO, R2O group) or acidic (RO2). The greater the proportion of oxygen the more acidic an oxide is.Amorphous
Without a regular structure. Amorphous minerals do not have a repeating crystalline matrix. Glass, for example, is amorphous because it is cooled in the kiln quickly enough that no crystals have an opportunity to form.Analysis
An analysis is typically used to compare the oxide content of materials. An analysis is expressed in percent and each number represents the amount by weight of the oxide. An analysis will often show LOI as one of the items, this represents the volatile portion of the material that is lost during firing. An analysis can be converted to a formula by dividing each oxide amount by the molecular weight of that oxide.Apparent porosity
The relation between the volume of a mass and the volume or water absorbed when the mass is immersed.Ash Glaze
A glaze that employs organic ash (e.g. paper, wood) as a source of oxides (e.g. silica, alumina, soda, calcia).
Much more information with complete interlinking to many related Copyright 2003 http://digitalfire.com, All Rights Reserved Please support http://ceramicmaterials.info to improve this library |  |
INSIGHT is ceramic chemistry |