Preparation method of compact calcium hexaluminate-corundum composite ceramic

A technology of calcium hexaaluminate and multi-phase ceramics, which is applied in the field of industrial ceramics preparation, can solve the problems of low diffusion coefficient of calcium hexaaluminate and corundum lattice, reduce production cost, and high sintering temperature, so as to reduce fuel cost and save raw materials The effect of low cost and firing temperature

Active Publication Date: 2020-12-25
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Calcium hexaaluminate-corundum composite ceramics (CaAl12O19-Al2O3) has excellent high temperature resistance and mechanical properties, and is an ideal high temperature structural ceramic material. However, due to the low lattice diffusion coefficient of calcium hexaaluminate and corundum, this The firing temperature of this composite ceramic is high, which is not conducive to reducing the preparation cost
Chinese invention patent "A corundum-calcium hexaaluminate based on aluminum chromium slag and its preparation method" (CN108484184A) uses aluminum chromium slag as the aluminum source, which reduces the cost of raw materials, but the sintering temperature is still as high as 1950-2050 °C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of dense calcium hexaaluminate-corundum composite ceramics, comprising the following steps:

[0023] (1) Raw material treatment: use a ball mill to wet-mill 8 hours of ferro-titanium slag and industrial alumina respectively. The ball-milling medium is water. Aluminum is passed through a 250-mesh sieve.

[0024] (2) Mixing of raw materials: adding zirconia, a reinforcing agent with a certain particle size, to the raw materials, and weighing ferro-titanium slag, alumina and zirconia in a certain proportion, wherein, 70% of ferrotitanium slag is weighed by mass percentage, industrial Alumina 22% and zirconia 8%, the fineness of zirconia is 20nm, ball milling in a ball mill tank for 1h and mixed evenly to obtain a mixture.

[0025] (3) Granulation and stale: adopt spray drying method, add PVA aqueous solution to the mixture according to 7% of the mass of the mixture, stale for 24 hours after granulation, and form a billet. Wherein, the PVA concentrati...

Embodiment 2

[0031] A preparation method of dense calcium hexaaluminate-corundum composite ceramics, comprising the following steps:

[0032] (1) Raw material treatment: use a ball mill to wet-mill 12 hours of ferro-titanium slag and industrial alumina respectively. The ball-milling medium is water. Aluminum is passed through a 250-mesh sieve.

[0033] (2) Mixing of raw materials: adding zirconia, a reinforcing agent with a certain particle size, to the raw materials, and weighing ferro-titanium slag, alumina and zirconia in a certain proportion, wherein, 50% of ferrotitanium slag is weighed by mass percentage, industrial Alumina 38% and zirconia 12%, the fineness of zirconia is 20nm, ball milled in a ball mill tank for 3 hours and mixed evenly to obtain a mixture.

[0034] (3) Granulation and staling: adopt spray drying method, add PVA aqueous solution to the mixture according to 10% of the mass of the mixture, stale for 48 hours after granulation, and form a billet. Wherein, the PVA co...

Embodiment 3

[0040] A preparation method of dense calcium hexaaluminate-corundum composite ceramics, comprising the following steps:

[0041] (1) Raw material treatment: Use a ball mill to wet-mill 10 hours of ferro-titanium slag and industrial alumina respectively. The ball-milling medium is water. Aluminum is passed through a 250-mesh sieve.

[0042] (2) Mixing of raw materials: adding zirconia, a reinforcing agent with a certain particle size, to the raw materials, and weighing ferro-titanium slag, alumina and zirconia according to a certain proportion, wherein, 60% of ferrotitanium slag is weighed by mass percentage, industrial 30% of alumina and 10% of zirconia, the fineness of zirconia is 20nm, ball milled in a ball mill tank for 2 hours and mixed evenly to obtain a mixture.

[0043] (3) Granulation and staling: adopt spray drying method, add PVA aqueous solution to the mixture according to 8% of the mass of the mixture, stale for 36 hours after granulation, and form a billet. Wher...

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Abstract

The invention relates to a preparation method of compact calcium hexaluminate-corundum composite ceramic, which comprises the following steps of: ball-milling, screening and dryingraw materials including 50-70% of ferrotitanium slag and 22%-38% of aluminum oxide, proportionally adding 8%-12% of zirconium oxide, uniformly mixing, adding PVA (polyvinyl alcohol) water solution, granulating, aging, carrying out compression molding in a mold, putting a formed blank into a drying oven for drying to form a green body, putting the green body into a silicon-molybdenum rod electric furnace for firing, and obtaining the compact calcium hexaluminate-corundum composite ceramic material at a proper firing temperature. The solid waste ferrotitanium slag is used as the main raw material, the solid waste utilization rate is high, the raw material cost is saved, the firing temperature is low, the fuel cost is reduced, and the prepared ceramic has high relative density.

Description

technical field [0001] The invention relates to the technical field of preparing industrial ceramics, in particular to a method for preparing dense calcium hexaaluminate-corundum composite ceramics. Background technique [0002] Calcium hexaaluminate-corundum composite ceramics (CaAl 12 o 19 -Al 2 o 3 ) has excellent high temperature resistance and mechanical properties, and is an ideal high temperature structural ceramic material. However, due to the low lattice diffusion coefficient of calcium hexaaluminate and corundum, the firing temperature of this composite ceramic is high, which is not conducive to Reduce preparation costs. For example, the Chinese invention patent "A Dense High-Purity Calcium Hexaaluminate-Corundum Composite Ceramic Material" (CN108439961A) uses high-purity chemical raw materials to prepare dense calcium hexaaluminate-corundum composite ceramics, but the firing temperature is as high as 1600~1750℃. Chinese invention patent "a microporous high-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/44C04B35/622C04B35/64
CPCC04B35/10C04B35/44C04B35/62204C04B35/64C04B2235/3244C04B2235/96C04B2235/77Y02P40/60
Inventor 吴建锋张晨徐晓虹
Owner WUHAN UNIV OF TECH
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