Check patentability & draft patents in minutes with Patsnap Eureka AI!

Preparation method of ultrafine alpha-Al2O3 powder and obtained product

A powder and mineralizer technology, which is applied in the field of preparing ultrafine α-Al2O3 powder, can solve the problems of large alumina particles and low alkali content, and achieve high-quality mass production and low-cost effects.

Active Publication Date: 2006-09-13
CHAOZHOU THREE CIRCLE GRP
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of this patent can produce alumina with low alkali content and good sintering performance, but the mixing of mineralizer and alumina is still done by dry mixing, and the prepared alumina particles are relatively large

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 of ultrafine alpha-Al2O3 powder and obtained product
  • Preparation method of ultrafine alpha-Al2O3 powder and obtained product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pour 1000kg of raw alumina powder into a mixer; weigh 1kg of boric acid and 2kg of aluminum fluoride and add them to 100kg of water; In the mixer; while spraying and stirring to make it fully mixed and then packed in the sagger; then neatly stack the sagger on the kiln car and push it into the tunnel kiln; calcined out of the kiln at 1250 ° C ~ 1350 ° C, Pour out the sagger and then crush and sieve to get the desired high-purity homogeneous α-Al 2 o 3 powder. figure 1 is the resulting α-Al 2 o 3 The scanning electron microscope picture of the powder, as can be seen from the figure, α-Al 2 o 3 The original crystal of the powder, and the crystal grains are spherical, approximately spherical or short columnar, and the particle size is between 0.8-3.0μm. For the obtained high-purity homogeneous α-Al 2 o 3 The powder is analyzed and tested, and the result is: by weight percentage, Al 2 o 3 The content of ≥99.8%, of which, α-Al 2 o 3 The content of ≥96%, SiO 2 ≤0...

Embodiment 2

[0032] Pour 1000kg of raw alumina powder into a mixer; weigh 0.5kg of boric acid and 2.5kg of aluminum fluoride and add them to 100kg of water; In the mixer of aluminum powder; while spraying and stirring to make it fully mixed and then packed in bauxite saggers; then stack the saggers neatly on the kiln car and push them into the tunnel kiln; after 1250 ℃ ~ 1300 ℃ calcined out of the kiln, poured out of the sagger and then crushed and sieved to obtain the required high-purity homogeneous α-Al 2 o 3 powder. figure 2 is the resulting α-Al 2 o 3 The scanning electron microscope picture of the powder, as can be seen from the figure, α-Al 2 o 3 The original crystal of the powder, and the crystal grains are spherical, approximately spherical or short columnar, and the particle size is between 1.0-3.0 μm.

Embodiment 3

[0034] Pour 1000kg of raw alumina powder into a mixer; weigh 1.5kg of oxalic acid and 2.5kg of aluminum fluoride and add them to 100kg of water; In the mixer of aluminum powder; while spraying and stirring to make it fully mixed and then packed in bauxite saggers; then stack the saggers neatly on the kiln car and push them into the tunnel kiln; after 1200 ℃ ~ 1250 ℃ calcined out of the kiln, poured out of the sagger and then crushed and sieved to obtain the required high-purity homogeneous α-Al 2 o 3 powder.

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
Login to View More

Abstract

A process for preparing superfine alpha-Al2O3 powder includes such steps as dissolving mineralizing agent in water, sprinkling it on the surface of raw aluminum oxide powder while stirring, and calcining at 1200-1400 deg.C. The resultant alpha-Al2O3 powder has high contents of Al2O3 and alpha-Al2O3, low content of Na2O, low cost and 1-3 microns in diameter.

Description

technical field [0001] The invention relates to a method for preparing ultrafine α-Al 2 o 3 The method of powder and resulting product, more particularly, the present invention relates to a kind of unstable gamma-Al under the high temperature 2 o 3 Type alumina powder is prepared as ultrafine, high temperature stable hexagonal corundum α-Al 2 o 3 Process for powders and products obtained therefrom. Background technique [0002] Ultrafine α-Al 2 o 3 Due to its excellent sintering performance and performance, the powder has a wide range of uses, and has been widely used as a light-transmitting alumina sintered body, a phosphor carrier, a filler, a single crystal material, a high-pressure sodium lamp, a semiconductor material substrate, and an audio tape Filling material, ruby ​​laser material, grinding material, electronic ceramic powder, etc. [0003] In the prior art, the preparation of ultrafine α-Al 2 o 3 Powder methods include gaseous evaporation method, plasma ...

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
IPC IPC(8): C01F7/02
Inventor 谢灿生
Owner CHAOZHOU THREE CIRCLE GRP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com