Abstract
In the preparation of CuCr alloy using the self-propagating high-temperature synthesis (SHS)-metallurgy method, the dissolution of alumina in molten slag has an important influence in two key steps: aluminum thermal reduction and slag refining. In the present work, the dissolution behavior of Al2O3 into molten SHS-metallurgical slags was investigated by employing the rotating cylinder method and static dissolution method. It is concluded that the increase of MgO, CaF2, CaO, and Na3AlF6 contents can increase the dissolution rate of alumina in SHS-metallurgical slag, and the order of influence is from strong to weak. Both temperature and rotating speed can increase the dissolution rate, and the rate-limiting step is the diffusion of alumina in the boundary layer, with the solid alumina first reacting with lime to form two intermediate phases, CaO·2Al2O3 and CaO·6Al2O3, and finally dissolving into the slag in the form of an aluminum polymer.
Highlights
Due to its superior properties, copper-chromium alloys are widely used as medium and high voltage vacuum switch contact materials in the modern power industry [1,2]
The various reagents were thoroughly mixed according to the predetermined composition ratio, and 150 g of the powder mixture was accurately weighed
In order to avoid the change of the interface when the alumina rod is taken out from the slag, this paper studied the formation of a mesophase by static dissolution experiments
Summary
Due to its superior properties, copper-chromium alloys are widely used as medium and high voltage vacuum switch contact materials in the modern power industry [1,2]. When using traditional self-propagating high-temperature synthesis (SHS) processes to prepare CuCr alloy, once the exothermic reaction ceases to be active, the metal and slag melt will solidify quickly. This will result in a large amount of alumina inclusions in the CuCr alloy [3,4]. Zhang et al [5] invented a new method for the preparation of CuCr alloy using the self–propagation high–temperature synthesis (SHS)-metallurgy process. In this process, high temperature melts obtained by the aluminothermic reaction are transferred to an induction furnace. The investigation of the dissolution behavior of alumina inclusions in SHS-metallurgical slag is very significant
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