Evaluation of High-temperature Physicochemical Interactions Between the H282Alloy Melt and Ceramic Material of the Crucible

Abstract

Nickel alloys belong to the group of most resistant materials when used under the extreme operating conditions, including chemically aggressive environment, high temperature, and high loads applied over a long period of time. Although in the global technology market one can find several standard cast nickel alloys, the vast majority of components operating in machines and equipment are made from alloys processed by the costly metalworking operations. Analysis of the available literature and own studies have shown that the use of casting technology in the manufacture of components from nickel alloys poses a lot of difficulty. This is due to the adverse technological properties of these alloys, like poor fluidity, high casting shrinkage, and above all, high reactivity of liquid metal with the atmospheric air over the bath and with the ceramic material of both the crucible and foundry mold. The scale of these problems increases with the expected growth of performance properties which these alloys should offer to the user. This article presents the results of studies of physico-chemical interactions that occur between the H282alloy melt and selected refractory ceramic materials commonly used in foundry. Own methodology for conducting micro-melts on a laboratory scale was elaborated and discussed. The results obtained have revealed that the alumina-based ceramics exhibits greater reactivity in contact with the H282 alloy melt than the materials based on zirconium compounds. In the conducted experiments, the ceramic materials based on zirconium silicate have proved to be a much better choice than the zirconia-silica mixture. Regardless of the type of the ceramic materials used, the time and temperature of their contact with the nickel alloy melt should always be limited to an absolutely necessary minimum required by the technological regime.

Archives of Foundry Engineering

“…The selection of casting material for elements of various machines and devices is the subject of research work carried out for many years at Łukasiewicz -Krakow Institute of Technology (formerly the Foundry Research Institute). Examples of such activities related to the constructional and material-technological conversion have been described, among other things, for alloys serviced in high-temperature wear conditions [9,10,11,12,13,14], and for alloys exposed to abrasive wear, which is the subject of this study [15,16,17,18,19,20]. In the case of many elements of machines and devices operating in difficult abrasive conditions, this problem is particularly important.…”

Microstructure of the oxide ceramics/Inconel 713C interface

“…The metal/ceramics interaction is a key issue in all foundry processes [11][12][13][14][15]. In addition to process conditions, such as the pouring temperature, the degree of superheating, and the speed and time of mould pouring, casting properties also depend on the quality of the ceramic mould surface.…”

High-Temperature Wettability and Interactions between Y-Containing Ni-Based Alloys and Various Oxide Ceramics

“…VIM has been almost the most common method for nickel-based superalloys. However, VIM is the only vacuum melting method that uses a refractory crucible made of oxides such as SiO 2 , CaO, Al 2 O 3 , ZrO 2 , and MgO [ 7 , 8 ]. Unfortunately, the refractory is a contamination source of oxygen because the metal/refractory interface has a thermal mechanical infiltration and thermophysical effects, which lead to crucible disintegration [ 9 , 10 ].…”