ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 29, (2) 97 - 104 (1985)


THE EFFECT OF WATER VAPOUR ON THE RATE OF SURFACE DIFFUSION ON CALCIUM SILICATES
 
Jesenák Viktor 1, Ziemer Burghard 2, Jančula Dušan 1
 
1 Department of the Chemical Technology of Silicates, Slovak Technical University, 812 37 Bratislava, SK
2 Zentralinstitut fur anorganische Chemie, Akademie der Wissenschaften, 1199 Berlin, D

A vacuum-deposited SrO layer on defined surfaces of α-wollastonite and α'-dicalcium silicate monocrystals behaves as a store of surface diffusion during tempering at T = 1150-1350 K. The diffusion coefficients calculated from the SrO surface density profiles, established by X-ray microanalysis, are significantly higher with specimens tempered in water vapour than with those tempered in dry air. The analogy with CaO allows to assume that surface diffusion, accelerated by the water vapour in the furnace atmosphere, takes an important part in the mechanism of calcium silicates formation.


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