The device group for pulling single-crystal fibers of refractory materials

 

(57) Abstract:

The invention relates to growing the single crystal from the melt of long fibers of refractory materials. The proposed device consists of a high-temperature growth chamber and the secondary camera installed on its cover. Growth chamber vacuum. It installed heater-boat to melt the block of formers and fridge-lock. In the lid of the growth chamber are made the holes for the output fiber. Roller pull mechanism placed in the additional chamber, with the upper rollers of the pulling mechanism mounted vacuum-tight in the output gap secondary camera. The holes for the output fiber from the growth chamber shielded cooler-clamp having a slit of variable cross-section. Fridge-latch mounted in the growth chamber, provided with an outer vacuum-tight by the arm. 1 C.p. f-crystals, 2 Il.

The invention relates to growing the single crystal from the melt of long fibers of refractory materials, in particular oxides, for example, sapphire, ruby, YAG garnet and other

Known device for pulling from respektowania [1] the Installation includes a vertically moving horizontal surface, which supports the furnace, consisting of two concentric quartz tubes attached with the sleeve and flange to the horizontal surface. The upper ends of the tubes are fixed in the head. The head is constructed so as to provide input in the furnace space of a long rod extrusion, which is attached to it. The lower end of the pull rod has an extension in the form of a rod, which acts as the holder for the seed crystal. Between the walls of the tube is continuously fed cold water. Furnace space surrounded by the coil of the heater. Mechanism design crystal pulling may be different, but it is preferable to use a pulling mechanism with hydraulic drive. Group pulling in the installation provides a compilation of several individual capillaries of the formers in the group.

However, the winding of the yarn on the drum is carried out in this facility within the crystallization chamber, which is several times increases the size of your camera and allows you to correct defects in the winding, making it difficult to extract the group of long fibers.

Closest to the invention is an installation for group cultivation fibers by capillaceum, block formers and fridge-lock. In the cover of the camera made the crack to output fiber with block sealing. Above the growth chamber installed roller pull mechanism.

However, poor sealing chamber growth does not ensure receipt of vacuum in it, i.e. not provided with the vacuum output fibers from the growth chamber and vacuum seal the outer movements fridge-release. Therefore, the process of obtaining single-crystal fibers produced in the cell growth in the flow of argon pressurized last. This process requires a large consumption of expensive highly pure argon, which is a very costly process.

The invention consists in that the installation comprises a high-temperature growth chamber in which is installed a heater-boat to melt the block of formers and fridge-lock, and additional camera installed on the lid of the growth chamber in which is placed a roller pull mechanism. Roller pull mechanism consists of two rows of upper and lower rollers, and the rollers of the upper row set vacuumpack in the output gap secondary camera and are continuous in the / establishment, which screened cooler-lock, with the gap variable section.

Fridge-latch mounted in the growth chamber may be provided with an outer vacuum-tight by the arm.

Due to the fact that the upper rollers are installed in the secondary camera vacuumpack, and refrigerator-latch equipped with a vacuum-tight manipulator, in cavities of growth and additional cameras is provided by the vacuum.

In Fig.1 shows the proposed device; Fig.2 extra Luggage.

The device group for pulling single-crystal fibers of refractory material consists of a high temperature growth chamber 1 and the secondary camera 2. In the camera 1 set the heater-boat 3 with the melt, block 4 of the formers and fridge-latch 5. In the cover 6 the growth chamber 1 has an opening 7 for the output fiber, which is shielded by the cooler 8 having a slot 9 variable cross-section. Secondary camera 2 mounted on the cover 6 the growth chamber 1. Additional camera 2 has a roller pull mechanism 10, consisting of the top 11 to 14 and the bottom 15 and 16 of the rollers. The upper rollers 12 and 13 are made of rubber vacuum, and the rollers 11 and 14 of the metal. The upper rollers 11-14 simultaneously is the art of transport. They are equipped with a device that allows you to raise the rollers during drawing of the fiber. The slit 9 variable cross-section formed by two converging copper screens 17 and 18 of the cooler 8, one of which is mounted on a spring. The upper rollers 11 to 14 are installed in the output gap 19 secondary camera 2 vacuumpack, providing vacuum.net total cavity formed jointly by the buildings of the growth chamber 1 and the secondary camera 2, with continuous output fiber from cameras 1 and 2. Fridge-latch 5 is equipped with a vacuum-tight high-frequency external pointing device 20, which allows the alignment slits of the refrigerator latch 5, without breaking the vacuum in the growth chamber 1.

In Fig.1, 2 are depicted as molybdenum screens 21 with stand. the tokovodov 22 with a vacuum seal 23, the vacuum seal 24 the Foundation of the secondary camera, the group pulling fibers 25, structurally 26, vacuum seal 27 of the rollers and a device 28 for distributing rollers 15 and 16.

The device operates as follows.

In high temperature (2300about(C) the growth of the vacuum chamber 1 from the melt, is placed in the heater-boat 3, with the help of block 4 of the formers produce continuous vytyagivaya group of fibers is fixed fridge-latch 5. Using this same refrigerator-latch 5 is set to the supercooling of the melt to the crystallization front. Then the group of fibers through the hole 7 is fed to the secondary camera 2 through a variable slit 9 of the cooler 8. Continuous stretching of the fibers is carried out roller mechanism (11-16), which is both a transport and a vacuum output fiber from the installation. The lower rollers 15 and 16 are divorced. This device makes it possible to smoothly without damaging the fiber during the drawing, continuously go from Kristallografiya to the seed, and then to the group of fibers. Next, the first crystallochemical with seed, and then a group of fibers is fed to the rollers 13 and 14 and sequentially outputted from the device. Derived from the device, the fiber wound on the drum. The outer arm 20 allows centering shifts slit fridge-latch 5 with the passage of the fiber.

Due to the fact that the upper rollers 11-14 installed vacuumpack in the output gap 19 secondary camera 2, and refrigerator-latch 5 is equipped with a vacuum-tight manipulator 20 in the cavity height of the camera 1 and the secondary camera 2 is provided a vacuum. Therefore, the proposed device provides fibers, what is important in the manufacture of optical fibers. Growing fiber in the chamber 1 is carried out in vacuum with a residual pressure of 10-5tor or in the atmosphere of Ar pressure of 1.2 kg/cm2.

The use of rollers of rubber vacuum with a small amount of high temperature camera 1 (the distance from the secondary chamber to the heater-shaper 350 mm) is possible due to the shielding holes 7 cooler 8. The cooler 8 is simultaneously an additional retainer of the fiber, reducing the vibration of the fiber.

The proposed device allows for a process of growing single-crystal high-temperature fiber (temperature 2100aboutC and above) in vacuum at continuous output fiber and winding it on the drum outside of the device.

1. The DEVICE GROUP FOR PULLING single-crystal FIBERS OF REFRACTORY MATERIALS, including high temperature growth chamber with a lid and pull roller mechanism, consisting of upper and lower rollers are driven, the camera is in the heater-boat to melt the block of the shaper and refrigerator-holder, and cap the growth chamber are made the holes for the output fiber, the balance of the optimum camera mounted on the lid of the growth chamber, the upper rollers of the pulling mechanism mounted vacuum-tight in the output gap secondary camera and the hole for the output fiber from the growth chamber shielded cooler-clamp having a slit of variable cross-section.

2. The device under item 1, characterized in that the refrigerator is a latch mounted in the growth chamber equipped with a manipulator.

 

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