Forming process of seed crystal bar chuck

A molding method and seed rod technology, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve the problems of rough hole wall, poor finish, poor coaxiality between the inner hole of the chuck and the seed rod, etc. , to achieve the effect of reducing production cost, good coaxiality and high finish

Inactive Publication Date: 2002-08-07
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) When casting at high temperature, the magnesia sand is easy to shift, resulting in a rough hole wa

Method used

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  • Forming process of seed crystal bar chuck
  • Forming process of seed crystal bar chuck
  • Forming process of seed crystal bar chuck

Examples

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Example Embodiment

[0019] The specific forming steps as above:

[0020] First make the chuck mold, such as figure 1 In the structure shown, the base 1 is processed into a truncated cone shape with high-purity graphite. There is a fixed central screw hole 109 with a depth of 8mm and M8 on the center of the large circular plane 101, and n=6 fixed molds are uniformly distributed on the small circular plane. Core screw holes 103, 104, 105, 106, 107, 108, see figure 2 . The chuck core 2 has n=6, each chuck core 2 has a diameter of 6mm and a length of 80mm. One end of the chuck core 2 has a threaded head 201 that matches the screw hole of the fixed core on the base 1. Such as Figure 4 Shown. The other end has a central inner hole 203 with a diameter of 5 mm and a depth of 7 mm, such as Figure 4 Shown. First, the base 1 and the chuck core 2 are processed by a lathe with high purity graphite. Then fix n=6 chuck cores in the fixed core screw holes 103, 104, 105, 106, 107, 108 on the base 1, and use zirco...

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Abstract

The forming method of seed crystal bar holder uses iridium material and includes the processes of making hlder mould, making casting pattern, melting iridium material, casting, demoulding, annealing and cutting. The holder mould comprises base seat and holder mould core, said base seat contains n (n is less than or equal to 20 and greater than or equal to 1) mould core screw holes for fixing the holder mould cores on the base seat, one end of holder mould core is fixed on the base seat, and its another end is equipped with a dcentral internal hole in which a hole plug is pulgged, and the baseseat and holder mould core are made of high-purity grahpite or asbestos, and the hole plug is made up by adopting high melting point crystal. It can be formed only by using one-step process, and is applicable to growth of several crystals.

Description

Technical field: [0001] The invention relates to a forming method of a seed rod chuck, which is suitable for the seed rod chuck used in a crystal pulling growth furnace, or used in high-temperature smelting. Background technique: [0002] Platinum (melting point 1800°C) and iridium (melting point 2450°C) are refractory platinum group metals, which can be made into seed rod chucks, stirring rods, containers for high-temperature melts, etc. used in crystal growth devices. , glass and ceramic industry indispensable material. The production of platinum group metal rods and rods is in the advanced technology: the Crystal Group of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences published "Precision of Iridium Vessels" in the "Physics" magazine (Volume III, Issue 4, page 234) in 1974. In the article "Casting", high-purity graphite is used as the mold core, and an inner hole with a diameter of 4-6 mm and a depth of 10-15 mm is machined on the mold core ...

Claims

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Application Information

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IPC IPC(8): C30B15/32
Inventor 徐月泉殷根弟金伟民徐军
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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