By Yu S Kuz'minov, E E Lomonova, V V Osiko
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Additional info for Cubic Zirconia and Skull Melting
Complete melting of the charge is accompanied by the establishment of an equilibrium condition which may be maintained for a long period of time. e. polycrystalline ingots or glasses are produced. In slow directional solidification of the melt by means of a gradual increase of the power of the generator or slow lowering of the crucible with the melt in relation to the induction coil it is possible to produce large single crystal blocks. 1. 9 1585 11 3 . 1 As a b o ve 4021 M e ta l drawing of seed crystals.
The melting process takes place up to reaching the bottom of the crucible and, subsequently, the central part of the charge melts in the quasiperiodic regime. Melting by this mechanism leads to an increase in the power generated by the generator during a long period of time in the vicinity of the crucible wall. This often results in damage of the skull layer and in irreversible changes in the conditions of the crystal growth process. In melting of the charge with porosity ε 2, the superheating of the melt is less marked in comparison with the first case because the power density P m2 /M 2 (Fig.
025 cm. It should be mentioned that the values of T S and T f , selected for the evaluation of the error of measurement, correspond to the unfavourable measurement conditions. The main factors complicating the measurement of temperatures in the melt in the case of direct HF heating are: firstly, the presence of high-frequency interference resulting in induction heating of the thermocouple and, secondly, the fact that the melt is insulated from the body of the crucible by a dielectric layer (skull) and is under a voltage whose value may reach several kilovolts.
Cubic Zirconia and Skull Melting by Yu S Kuz'minov, E E Lomonova, V V Osiko