Flash-burning preparation method of rare-earth oxide transparent ceramic scintillator

Abstract

The invention provides a flash-burning preparation method of a rare-earth oxide transparent ceramic scintillator. The method comprises the following steps: (1) pouring mixed rare-earth oxide granulating powder into a mold for dry pressing; (2) degreasing and sintering to obtain a biscuit; (3) heating the biscuit in a tube furnace to 900-1000 DEG C; (4) clamping two sides of the biscuit with an electrode material, introducing direct current, controlling voltage to linearly increase from 0V at a speed of 20-100V / s until a flash phenomenon happens at about 60-100V; (5) controlling the current toreduce to 1000A or lower, and keeping the current to be constant, and lasting for 20-50 seconds; (6) cooling to room temperature to obtain a rare-earth oxide transparent ceramic scintillator; and (7)grinding and polishing the scintillator to form a transparent ceramic scintillator body.

Description

technical field [0001] The invention relates to the preparation technology of mechanical and electronic products, in particular to the preparation technology of high-energy X-ray scintillators, and specifically, it shows a method for preparing rare earth oxide transparent ceramics by flash firing. Background technique [0002] Radiation detection technology based on high-energy X-rays (MeV) can be used for non-destructive testing of large-scale, high-density metal parts. The resulting high-energy industrial CT technology has become an indispensable detection method for modern industry. As a traditional radiation imaging detector, film can provide very high resolution (~20 microns), but it cannot perform three-dimensional imaging. [0003] Flat-panel radiation detection arrays can be used for CT image reconstruction, but the speed is very slow and the resolution is not high. Under MeV X-rays, the pixel size is about 150 microns, and the actual detection can reach 0.5 mm, whic...

AI Technical Summary

Problems solved by technology

[0005] In the past, the preparation of transparent ceramics generally used hot isostatic pressing and hot pressing sintering processes. The preparation cycle was long and the cost was high, resulting in high prices for transparent ceramics.