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AssigneeAVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik m.b.H. Prof.Dr.Dr.h.c. Hans List
InventorsGunter Engel, Alfred Enko, Peter W. Krempl, Uwe Posch
Estimating the term…
In order to prevent crystal seeds with retrograde solubility from dissolving in the hydrothermal growing solution at the beginning of the growing process, and to protect the finished crystal at the end of the growing process, and in order to reach the thermodynamic growth equilibrium as soon as possible, the proposal is put forward that the growing solution be prepared, pre-saturated and pre-heated to a temperature close to saturation temperature outside of the growing tank, and that, for the growing process proper, the hot growing solution be added to the pre-heated growing tank provided with crystal seeds, where it should be further heated to a temperature at which the crystals start growing, and, further, that the hot growing solution be quickly removed from the growing tank as soon as the growing process has been completed.
Apparatus for growing homogeneous crystals from a hydrothermal growing solution, said crystals exhibiting retrograde solubility, comprising a vertically elongated growing tank in the interior of which crystals are to be grown to desired size from said growing solution, and an external tank for retaining growing solution, means connecting said tank and said growing tank so that growing solution can be forced from said external tank to said growing tank and removed therefrom, a hollow tube extending from a position at the top of said growing tank through the interior thereof to a location near the bottom thereof, means forcing growing solution from said external tank through said connecting means to said tube, and thereafter through said tube to the bottom of said growing tank to fill said tank interior to an appropriate level, and means forcing said growing solution from said tank into said tube and from said tube to said connecting means and said external tank, whereby said growing solution can be supplied to said growing tank and removed therefrom without opening said growing tank to discharge the contents thereof with a degree of rapidity such as to minimize dissolving of said crystals as said growing solution cools due to said retrograde solubility of said crystals.
Apparatus for growing homogeneous crystals from a hydrothermal growing solution, said crystals exhibiting retrograde solubility, comprising a vertically elongated growing tank in which crystals of desired size are grown from a growing solution, said tank having an elongated hollow tube extending from the upper end thereof down through the tank to a position adjacent the bottom of the interior of said tank, means for supporting holders for crystal materials, said supporting means extending in substantially vertical stacks through the interior of said tank, said holders being supported by said supporting means in spaced relationship to each other, said tube extending substantially along the vertical axis of said growing tank and being spaced from said holders, and means for supplying a growing solution into the upper end of said tube, through said tube to the bottom of said growing tank and thereafter up into said growing tank to a desired level therewithin and into contact with said crystal materials on said holders, so that said growing solution may be added to said tank and rapidly withdrawn therefrom without such a change in temperature as will markedly solubilize crystals formed due to the retrograde solubility of said crystals.
Dependencies are inferred from the claim text.