Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method and application of gadolinium oxysulfide scintillation ceramic

A technology of gadolinium oxysulfide and scintillation ceramics, which is applied in the direction of radiation measurement, instruments, and measuring devices, can solve the problems of high cost and complicated process, achieve good compactness, low porosity, and facilitate popularization and use

Pending Publication Date:
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The method of the present invention can obtain qualified gadolinium oxysulfide scintillation ceramics by one-time sintering, and does not need secondary sintering by using spark plasma method (SPS) or uniaxial hot pressing combined with hot isostatic pressing, which solves the problem of current thermal problems. Static pressure technology needs to sinter the green body first, and gadolinium oxysulfide powder metal needs vacuum sealing process, high cost and complicated process; products that meet the performance requirements can be achieved by one-step sintering, making the production process more energy-saving, more efficient, and yield high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of gadolinium oxysulfide scintillation ceramic
  • Preparation method and application of gadolinium oxysulfide scintillation ceramic

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The preparation method of the gadolinium oxysulfide scintillation ceramic disclosed by the present invention comprises the following steps:

[0041] S1. Raw material mixing: add sintering aid LiF or Li to the gadolinium oxysulfide powder 2 GeF 6 , according to the mass ratio, the addition amount of the sintering aid is 0.05-1.5% of the addition amount of gadolinium oxysulfide powder;

[0042] S2. Ball milling treatment: the ball-to-material ratio is selected to be 2-10:1, and the ball milling is carried out under protected conditions; the ball milling time is 8-36 hours, and a uniformly mixed powder is obtained;

[0043] S3. One-step sintering treatment: vacuum sintering or discharge plasma sintering is used for the powder processed by ball milling in step S2;

[0044] Among them, the vacuum sintering is: put the powder in a vacuum hot-press furnace, the initial sintering temperature rise rate is 5-50°C / min, the pressure is 25-100MPa, the temperature is 800-950°C, and...

Embodiment 1

[0050] The preparation method of the gadolinium oxysulfide scintillation ceramic of the present embodiment comprises the following steps:

[0051] S1. Raw material mixing: weigh 2 kg of commercial Gd with a purity of 99.999% and a median particle size of 3 μm 2 o 2 S:Pr, Ce scintillation ceramic powder, add 2g Li 2 GeF 6 Sintering aids.

[0052] S2. Ball milling treatment: the ball-to-material ratio is 2:1, ball milling uses zirconia beads, and the diameters of zirconia beads are selected from large, medium and small sizes for proportioning. The average diameter of zirconia beads is 4mm, 6mm and 8mm. The order of its diameter is large, medium and small, and the mass ratio of its zirconia beads is 1:3:5.

[0053] Put it into a ball mill jar, and pass it into an Ar atmosphere, close the ball mill jar, and finally place the ball mill jar in a planetary ball mill for 8 hours of ball milling at a speed of 800rmp.

[0054] S3. Vacuum sintering: Put the ball-milled gadolinium ox...

Embodiment 2

[0059] The preparation method of the gadolinium oxysulfide scintillation ceramic of the present embodiment comprises the following steps:

[0060] S1. Raw material mixing: weigh 2 kg of commercial Gd with a purity of 99.999% and a median particle size of 3 μm 2 o 2 S:Pr, Ce scintillating ceramic powder, add 30g Li 2 GeF 6 Sintering aids.

[0061] S2. Ball milling treatment: the ratio of ball to material is 10:1; the ball milling treatment uses zirconia beads, and the zirconia beads have different diameters of large, medium and small sizes for proportioning. The average diameter of zirconia beads is 4mm, 6mm and 8mm. The order of its diameter is large, medium and small, and the mass ratio of its zirconia beads is 1:2:5. The raw materials were put into a ball mill jar, and an Ar atmosphere was introduced, the ball mill jar was closed, and finally the ball mill jar was placed in a planetary ball mill for 30 hours of ball milling at a speed of 500 rpm.

[0062] S3. Vacuum sin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
band gapaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of gadolinium oxysulfide scintillation ceramics, which is characterized in that Gd2O2S scintillation powder is sintered and molded by one-step sintering through a vacuum hot pressing sintering or spark plasma sintering method, and gadolinium oxysulfide polycrystalline scintillation ceramic doped with at least one element of Pr, Eu, Tb, Sm, Yb and Tm is efficiently obtained. According to the method, qualified gadolinium oxysulfide scintillation ceramic can be obtained through one-time sintering, secondary sintering does not need to be carried out through a method combining SPS or uniaxial hot pressing with hot isostatic pressing, and the defects that in the current hot isostatic pressing technology, a green body needs to be sintered firstly, gadolinium oxysulfide powder metal needs a vacuum sealing technology, the cost is high, and the technological process is complex are overcome; and the production process is more energy-saving and more efficient. According to the method, the temperature rise rate, pressure, temperature and time of sintering are combined, so that the characteristics of fine grain size and high density of a gadolinium oxysulfide scintillation ceramic finished product are effectively ensured, and popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of scintillation ceramics preparation, in particular to a preparation method of gadolinium oxysulfide scintillation ceramics and an application of gadolinium oxysulfide scintillation ceramics. Background technique [0002] Gadolinium oxysulfide is a hexagonal structure with a high resistance to X-rays, a band gap of 4.6 eV, high luminous efficiency, strong oxidation resistance, high light absorption rate and transmission efficiency. Due to the existence of anisotropy, there is birefringence on the grain boundary, and it is not easy to prepare transparent ceramics. Doping ions in rare earth oxysulfides (RE 2 o 2 S: Ln lanthanides), where RE is a rare earth element, Ln is a dopant ion, and is at least one element among Pr, Eu, Tb, Sm, Yb, Tm, Ho, Dy. Single crystal material scintillation material has disadvantages such as complex preparation process, long production cycle, high cost, poor machining performa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/64C04B35/645G01T1/202
CPCC04B35/50C04B35/645C04B35/64G01T1/2023C04B2235/5436C04B2235/666C04B2235/445
Inventor 安宁于金凤狄聚青
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com