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Preparation method of high-strength alumina ceramic substrate

An alumina ceramic and high-strength technology, which is applied in the field of preparation of high-strength alumina ceramic substrates, can solve problems such as the strength of cracked and deformed alumina ceramic substrates, and achieve the effect of avoiding cracking and deformation.

Inactive Publication Date: 2018-06-08
CHANGZHOU C PE PHOTO ELECTRICITY SCI & TECHN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main technical problem to be solved by the present invention is to provide a method for preparing a high-strength alumina ceramic substrate, aiming at the defects of easy cracking and deformation during the sintering molding process of the alumina ceramic substrate and the low strength of the alumina ceramic substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027]Put 70g of kyanite ore in a ball mill jar, add agate ball milling beads with a particle size of 6mm, and mill for 30 minutes to obtain kyanite powder. Mix kyanite powder and aluminum fluoride trihydrate at a mass ratio of 3:1 and put in Continue ball milling in the ball mill jar for 1 hour to obtain mixed mineral powder, put the mixed mineral powder into a corundum crucible, heat up to 1550°C, heat-preserve and calcinate for 4 hours to obtain mullite; put the mullite in a mortar and grind for 3 hours, pass 200 mesh sieve to obtain mullite powder, put 60g of mullite powder into 200mL of silica sol with a mass fraction of 25%, stir and disperse for 10min, then transfer to a high-speed shearing machine to shear at a speed of 4000r / min at a high speed. Add 40 mL of aluminum nitrate solution with a mass fraction of 10% to the high-speed shearing machine, and then add ammonia water with a mass fraction of 50% to adjust the pH of the system to 9, continue high-speed shearing for...

example 2

[0029] Put 75g of kyanite ore in a ball milling tank, add agate ball milling beads with a particle size of 7mm, and mill for 40 minutes to obtain kyanite powder. Mix kyanite powder and aluminum fluoride trihydrate at a mass ratio of 3:1 and put in Continue ball milling in the ball mill tank for 1.5h to obtain mixed mineral powder, put the mixed mineral powder into a corundum crucible, heat up to 1570°C, heat-preserve and calcinate for 4.5h to obtain mullite; put the mullite in a mortar and grind for 3.5 h, pass through a 200-mesh sieve to obtain mullite powder, put 65g of mullite powder into 250mL of silica sol with a mass fraction of 25%, stir and disperse for 12min, and then transfer it to a high-speed shearing machine to shear at a speed of 4500r / min. Cut, add 45mL aluminum nitrate solution with a mass fraction of 10% to the high-speed shearing machine, and then add ammonia water with a mass fraction of 50% to adjust the pH in the system to 9, continue high-speed shearing fo...

example 3

[0031] Put 80g of kyanite ore in a ball mill jar, add agate ball milling beads with a particle size of 8mm, and mill for 45 minutes to obtain kyanite powder. Mix kyanite powder and aluminum fluoride trihydrate at a mass ratio of 3:1 and put in Continue ball milling in the ball mill tank for 2 hours to obtain mixed mineral powder, put the mixed mineral powder into a corundum crucible, heat up to 1600°C, heat-preserve and calcinate for 5 hours to obtain mullite; put the mullite in a mortar and grind for 4 hours, pass 200 mesh sieve to obtain mullite powder, put 70g mullite powder into 300mL of silica sol with a mass fraction of 25%, stir and disperse for 15min, then transfer to a high-speed shearing machine to shear at a high speed of 5000r / min. Add 50 mL of aluminum nitrate solution with a mass fraction of 10% to the high-speed shearing machine, and then add ammonia water with a mass fraction of 50% to adjust the pH of the system to 10, continue high-speed shearing for 20 minute...

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PUM

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Abstract

The invention discloses a preparation method of a high-strength alumina ceramic substrate, and belongs to the technical field of ceramic substrate preparation. Carbon dioxide is introduced into a sodium aluminate solution, then ultrafine aluminum hydroxide crystal grains can be formed, the ultrafine aluminum hydroxide crystal grains are mixed with a precursor sol, and tape casting is performed toobtain a tape-casted raw material tape with good cohesiveness. Because the thermal expansion coefficient of the sol is high, the bonding toughening effect is played, and thus cracking and deformationof the alumina ceramic substrate during sintering molding are avoided; mullite whiskers can grow after the sol in micro through holes of the alumina ceramic substrate is sintered and then cooled, alumina particles of the alumina ceramic substrate are wound by the whiskers, the whiskers are beneficial for uniform distribution of internal stress, the relative displacement between alumina and the silicate crystal grains is reduced, and the whiskers can inhibit aggregation and growth of the crystal grains and can effectively reduce pores in ceramics, so that the compactness of a sintered body is improved, the crystal grains in the alumina ceramic substrate are distributed uniformly, the crystal grain distribution is compact, the mechanical strength is enhanced, and the application prospect isbroad.

Description

technical field [0001] The invention discloses a method for preparing a high-strength alumina ceramic substrate, which belongs to the technical field of ceramic substrate preparation. Background technique [0002] Alumina ceramic is a ceramic material mainly composed of alumina, which is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina ceramics are a kind of ceramics with a wide range of uses. Because of its superior performance, it has been more and more widely used in modern society, meeting the needs of daily use and special performance. Alumina ceramics are divided into high-purity type and ordinary type. [0003] Alumina ceramic substrates are widely used in the electronics industry as electronic packaging materials, substrate materials, multilayer capacitor materials, and electronic component materials. Tape casting ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/626C04B35/63C04B35/80
CPCC04B35/10C04B35/622C04B35/6261C04B35/6316C04B35/803C04B2235/3222C04B2235/3463C04B2235/445C04B2235/6025
Inventor 龙仕冬何少雄陈可
Owner CHANGZHOU C PE PHOTO ELECTRICITY SCI & TECHN
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