METHOD OF GROWING OF REFRACTORY MONOCRYSTALS AND A DEVICE FOR ITS REALIZATION Russian patent published in 2005 - IPC

FIELD: inorganic chemistry and crystallography.

SUBSTANCE: the invention is pertaining to the field of inorganic chemistry and crystallography, in particular, to a method and a device for growing of large-size refractory monocrystals. The method provides for seed melting in a fixed container by heating of a feed stock and its weld penetration with subsequent crystallization and cooling-down. The seed melting of a monocrystal is conducted by a contact of a seeding agent with a melt and connection with it due to a capillary tension with a diameter in the place of the contact about 20-50 microns, At that the seeding agent is placed outside of the container at a distant of 3-5 mm away from the container spout, and the crystallization is conducted at variation of a gradient of temperatures within the limits of T = 15-20°С along the whole length of the container. The device for growing of refractory monocrystals contains a chamber of growing composed of two parts: the upper part - with a thermal unit containing a heater made in the form of a cylinder turned upside down and a system of the multilayered shields iterating the form of the heater, and the fittings for fixation of the seeding agent; and the lower part, on which a container with the feed stock mounted rigidly fixed on a support composed out of the multilayered shields. The support is made with a capability of lifting and a tight coupling with the upper part of the chamber after the container enters a thermal assembly. The invention allows to grow monocrystals of the special large dimensions and weights and at that to improve significantly their optical characteristics.

EFFECT: the invention allows to grow monocrystals of especially big dimensions and weights and to improve significantly their optical characteristics.

2 cl, 3 dwg