By Dr. Yury G. Gogotsi, Professor Dr. Vladimir A. Lavrenko (auth.)
"Corrosion of High-Performance Ceramics" is a finished survey of the state-of-the-art of this new box of analysis. It offers the 1st generalized description of the corrosion of engineering ceramics and its impact on their mechanical homes (based on Si3N4, SiC, AlN, B4C, BN, Al2O3, ZrO2). Researchers, engineers and graduate scholars are supplied with a advisor to the functionality of non-oxide and oxide ceramicsin corrosive environments. key phrases: high-temperature oxidation; sizzling corrosion; corrosion in acids, alkalis and molten salts; results of corrosion at the physico-mechanical homes of ceramics; pressure corrosion; corrosion security; improvement of oxidation-resistant ceramics; position of purity, donations and microstructure.
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65]. Among dense silicon nitride materials CVD Si3N4 occupies an isolated position. 35] do not contain sintering aids and are superior in oxidation resistance to hot-pressed and sintered ones (Chap. 7). 6 Peculiarities of Oxidation Kinetics All the above kinetic curves for silicon nitride ceramics gave evidence of the retardation of oxidation with time, thus of promising potentials for the application of such materials at high temperatures in oxidizing environments. However, the precise investigations of the oxidation kinetics demonstrate that in some cases after a certain period of time the oxidation process accelerates (Fig.
16) leading to the formation of SiO, as in the case of Si3 N4 , increases with growing temperature and decreasing partial oxygen pressure. 25 presents the plot showing the areas of active oxidation with the formation of only gaseous products and the areas of passive oxidation accompanied by the Si0 2 formation. 74], the temperature of active/passive oxidation transition is also dependent on the gas flow rate. 71]. 0' 0> ~ 0 -2 -I. 1. 25. 73] 27 served. On oxidation of a - SiC single crystals cristobalite is not formed up to 1400° C.
The value of the apparent activation energy of oxidation 650 kJ Imol was determined by the Arrhenius equation according to the plot presented in Fig. 20b. 5). The XRD analysis of the specimens exposed to 800°-1000° C for 5 h did not reveal any changes in the phase composition, though a white deposit formed on their surface was observed. Oxidation at 1200°-1500° C results in the formation of a-cristobalite, forsterite, enstatite and borosilicate glass. In this case up to 1300° C the oxidation products solidify after cooling as a smooth glassy film uniformly covering the specimen surface.
Corrosion of High-Performance Ceramics by Dr. Yury G. Gogotsi, Professor Dr. Vladimir A. Lavrenko (auth.)