Preparation and Heat Resistance of Porous Titanium Carbosilicide
- PDF / 724,059 Bytes
- 6 Pages / 594 x 792 pts Page_size
- 16 Downloads / 176 Views
Vol. 61, No. 1, May, 2020
PREPARATION AND HEAT RESISTANCE OF POROUS TITANIUM CARBOSILICIDE A. A. Smetkin,1 V. G. Gilev,1,2 M. N. Kachenyuk,1 and D. S. Vokhmyanin1 Translated from Novye Ogneupory, No. 1, pp. 57 – 62, January 2020.
Original article submitted September 23, 2019. The results of studies on the preparation of titanium carbosilicide with porosities of 20, 40, and 60% are presented. Experimental samples were obtained using a pore former in the form of NaCl crystals. Sintering of porous samples at temperatures up to 1300°C was characterized using thermomechanical analysis. The pore structure was studied at the macro- and micro-levels using the method of optical microscopy. The nature of the oxidation of the studied samples was revealed based on mass change with the duration of tests and intensity of corrosion in air at 1100°C. X-ray diffraction analysis and Raman spectroscopy results showed that during high-temperature oxidation, predominantly titanium oxide is formed in the form of rutile. Keywords: titanium carbosilicide, pore former, sintering, pore structure, heat resistance, high temperature oxidation, titanium oxide.
using agarose as the gelling agent. Depending on the open porosity, the mean pore size range was 20 – 170 mm. Another effective method of preparing highly porous MAX-materials is using various pore formers. Porosity can be formed by the appropriately selected pore former, which determines the size and shape of the pores in the final product. Technologically, the process of pore formation consists in mixing the powders of the base material and the pore former, followed by pressing the pellets. The removal of the pore former occurs before or during sintering as a result of dissolution or evaporation [14, 15]. Typical pore formers used in the preparation of porous titanium and MAX-materials include: urea, ammonium bicarbonate NH4HCO3, magnesium, titanium hydride, or polymer particles [16 – 21]. The advantages of easily soluble pore formers are obvious, since such components practically do not pollute the material and with their help it is easy to regulate the pore structure. To the greatest extent, researchers tend to use pore formers such as sodium chloride, sucrose, ammonium bicarbonate. As such, the results of studies of porous Ti2AlC obtained using raw sugar as a pore former are presented in [22]. It has been shown that using a readily soluble pore former, it is possible to form a homogeneous structure with porosity in the range of 23 – 76 vol.% with a pore size of 100 – 500 mm. During sintering, partial decomposition of Ti2AlC into Ti3AlC2 occurs. Porous Ti2AlC samples with porosity in the range of
INTRODUCTION In recent years, porous MAX-phases have been of interest as unique materials. Systematic studies of the control of their porosity and pore size are necessary to optimize their functional properties. For example, porous Ti2AlC is an attractive material for electrodes in aggressive chemical environments, microbial fuel cells (MFCs), and solar collectors [1]. Porous MAX-material
Data Loading...
