Wettability, surface tension, and reactivity of the molten manganese/zirconia-yttria ceramic system

Abstract

A basic research study for improvement of plasma-sprayed zirconia coatings has been conducted. The contact angle and surface tension of the molten manganese/zirconia-yttria ceramic system were measured at 1573 K by the sessile drop method, suggesting that molten manganese would spontaneously infiltrate open pores in zirconia coatings. Structure and elementary composition development of zirconia ceramics caused by reaction with manganese were examined by using scanning electron microscopy (SEM), an electron probe microanalyzer (EPMA), and an X-ray diffractometer (XRD). Manganese not only stabilized cubic zirconia but also contributed to the growth and volume increase of zirconia particles. In this article, the mechanism of making zirconia coatings dense with manganese is discussed based on the results of experiments.

Wettability and Interfacial Permeability between Prereduced Ilmenite and Molten Pig Iron

“…The contact angle was measured by the sessile droplet of molten pig iron on the prereduced ilmenite substrate, and the uncertainty of the measured contact angle was estimated less than 0.5 % as described in the previous papers. 12,[20][21][22] The interfacial topography was observed by optical microscope (Leitz Wetzlar-307) and JSM scanning electron microscopy which is equipped with energy dispersive spectroscopy (EDS) to observe the distribution of elements. The phases in reduced ilmenite were investigated by using XRD (Philips 1 140, Cu Ka, 40 mA current, 30 kV voltage).…”