Production method capable of improving crystal utilization rate based on pulling process

Abstract

The invention discloses a production method capable of improving a crystal utilization rate based on a pulling process. The method comprises the following steps: a) selecting a precious metal crucible; b) preparing raw materials and treating the raw materials; c) dissolving the raw materials and performing necking down; d) performing shoulder formation: after necking down is performed, performingmanual large shoulder expanding angle or flat shoulder expanding operation, setting curve cooling parameters, setting a curve cooling speed according to different crystal habits, when a pulling speedis 0, that is, when the flat shoulder expanding operation is performed, observing a crystal growth diameter by utilizing naked eyes or visual equipment, and when a pulling speed is not 0, that is, when the large shoulder expanding angle operation is performed, calculating the diameter by referring to weight change; and e) performing cylinder formation. Through the above manner, the production method capable of improving the crystal utilization rate based on the pulling process provided by the invention particularly adopts the manual large shoulder expanding angle or flat shoulder expanding operation, and controls the curve cooling and the pulling speed to realize the large shoulder expanding angle or flat shoulder expanding at the top of the cylinder and reduce the problem of waste duringcrystal processing.

Description

technical field [0001] The invention relates to the technical field of crystal production, in particular to a production method based on a pulling method for improving crystal utilization. Background technique [0002] Scintillation material is a light functional material that absorbs high-energy photons and emits visible light. It is widely used in high-energy physics (such as precision electromagnetic calorimeters), nuclear medicine (such as X-CT, PET and γ cameras), industrial applications (CT flaw detection ), space physics, geological exploration and other fields. At present, inorganic scintillators are the most numerous and widely used. Inorganic scintillators can be divided into intrinsic scintillators and doped scintillators. With people's deeper understanding of scintillation crystals and the development of crystal growth technology, high melting point doped scintillators have become the new generation of scintillation crystals due to their advantages such as high...

AI Technical Summary

Problems solved by technology

Assuming that the shoulder angle of the crystal is 60 degrees and the equal diameter is 60mm, the shoulder of the crystal is a cone with a height of about 50mm and a diameter of 60mm at the bottom. If the density of the crystal is 7g / ml, the mass of the cone is about 1300g, but the cone The processing material extraction rate of the cylinder is much lower than that of the cylinder, in other words, a large part of the shoulder is wasted during the processing