Resistivity ceramics

Versatile ceramic resistant to acids, alkalis, molten metals, molten salts, oxidizing and reducing gases at high temperatures widely used in high-temperature laboratory and pilot-scale operations Generally used in conjunction with CaO, MgO or Y2O3 as stabilizers ... 

From a practical point of view, it is important to be able to predict AT. . Furthermore, it is only by understanding the various parameters that affect thermal shock that successful design of solids which are resistant to it can be carried out. In the remainder of this section, a methodology is outlined for doing just that, an exercise that will by necessity highlight the important parameters that render a ceramic resistant to thermal shock. 

Mechanical ceramics Wear protection ceramics Resistant to abrasion Thread guides, linings, tubes, roll ... 

Very good adhesion to metals and ceramics resistant to organic solvents... 

Class Ceramic Resistivity (Q-cm) Temperature Range of Validity... 

All other conditions being fixed, the only way of increasing the ceramic resistivity is to use substitutions. Chilton has substituted uranium into calcium-doped lead titanate to produce an increase in resistivity by approximately one order of magnitude (Fig. 6.9). It can be seen that the resistivity increases, with a maximum around 1.0 mol%. This variation is explained by considering the ceramic as a p-type semiconductor. The uranium will act as a donor of electrons, and as the amount of uranium increases, the initial effect is to cancel out the majority carriers (holes). 

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