| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] USP. Escola Politécnica. Departamento de Engenharia Metalúrgica e de Materiais
[2] USP. Escola Politécnica. Departamento de Engenharia Metalúrgica e de Materiais
[3] USP. Escola Politécnica. Departamento de Engenharia Metalúrgica e de Materiais
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Cerâmica; v. 47, n. 304, p. 187-192, 2001-12-00. |
| Abstract | |
The use of suspensions as an intermediate step in the processing of the ZrO2-MgO mixture arises as an alternative to obtain homogeneity on the final product. A relationship between the stability control of this suspensions and the achievement of homogeneity on the product may be established. The behavior of oxide mixture suspensions depends on the physical-chemical characteristic and of the relative content of each component. In this work the behavior of each component of the ZrO2-MgO mixture was studied, either in aqueous or ethylic suspension, and also the behavior of the mixture. Zirconium oxide in ethylic suspension shows a highly negative potential; Magnesium oxide, on the other hand, shows a positive potential. The explanation was found after Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy measurements, revealing a reaction between the solvent and surface of the oxides. A new mechanism for the desagglomeration effect of the ZrO2 ethylic suspensions, as a function of the highly electrostatic potential of the suspension is proposed. The study of suspensions of a mixture of both oxides for 3 wt% of MgO (~ 8.6 mol%) content shows that the final paH as well as the zeta potential are determined by the surface characteristics of the latter, even being the minor component in the mixture. (AU) | |