Non destructive monitoring of cavitation erosion of cordierite based coatings

Abstract

Coating materials are widely used in refractory lining to prevent different deleterious effects such are reactions on the mold-metal contact surface, abrasion from liquid metal or alloy, gasses, slags, and other materials in contact with the coating. In this paper, behavior of cordierite based coating exposed to the cavitation erosion was investigated. Cordierite samples sintered at 1200 and 1400 °C were used for the tests. Mass loss, level of surface degradation obtained using image analysis and thermal imaging analysis were applied for the cavitation erosion evaluation. Results showed that the cordierite samples can be successfully used in conditions where the cavitation resistance is required.

Determination of degradation level during cavitation erosion of zircon based ceramic

“…Cavitation erosion testing was performed using ultrasonic vibration method (with stationary specimen) according to standard procedure [14,15]. The usual characteristics for the frequency and peak-to-peak displacement amplitude of the horn were used, as well as characteristics of liquid are described in details in previous papers [8,9,16,[24][25].…”

“…Monitoring of the surface erosion caused by the cavitation and hence the surface damage level were performed by image analysis as an addition to the standard laboratory procedure of the mass loss measuring [8,9,[24][25]. Image Pro Plus (IPP) program [27] was used in analysis of the sample surfaces.…”

“…Namely, cavitation erosion is a phenomenon usually observed in many types of hydraulic structures and engineering installations such as ship propellers, pumps, hydraulic turbines or valves, while the metallic materials is mostly used for the synthesis of the components that should be exposed to the cavitation. Recent studies are mainly occupied by replacement of metallic components with composite and ceramic materials as well as to enhance the erosion resistances of different alloys and steels by deposition of protective coatings on their surfaces [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Therefore, the reliable approach to analyze and predict the risk of cavitation erosion of different materials used in such conditions is very welcome.…”

“…In order to monitor behaviour of zircon sample in such condition, conventional method of measuring the mass loss was applied. In addition, image and thermal imaging analyses are also implemented for better understanding of material degradation induced by the cavitation [8,9,24,25,[27][28][29][30][31][32][33][34][35][36]. This approach is useful for the assessment of cavitation resistance of zircon based ceramics and possibilities of its future application in practice.…”

Cavitation of refratory samples based on talc and domestic zeolite

“…Za ispitivanje uzoraka talka +15% zeolita sa ležšta "Igroš" sinterovanih na 1200°C primenjena je ultrazvučna vibraciona metoda (sa stacionarnim uzorkom) prema standardu ASTM G32 [21]. Izbor karakterističnih parametara za ovu metodu kao što su frekvenca vibracije talasovoda, temperatura tečnosti, udaljenost uzorka od čeone površine sonde, karakteristike tečnosti izabrani su u skladu sa standardom i ranijim radovima [19][20][21][22][23].…”