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Porous corundum aggregate with core-shell structure and preparation method thereof

A core-shell structure and corundum technology, which is applied in the field of porous corundum aggregate and its preparation, can solve the problems of long production cycle, decreased bulk density and low sintering temperature of alumina hollow sphere blanks, and achieves good thermal shock stability, The effect of low porosity and simple production process

Inactive Publication Date: 2015-03-11
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) Although its bulk density is lower than that of sintered tabular alumina, the volume density of sintered tabular alumina does not drop significantly compared with that of sintered tabular alumina, and its strength will also be relatively reduced; (2) The molding process still uses the original Some equipment and large-scale high-energy consumption equipment
The disadvantages of this method are: (1) the production cycle of the alumina hollow sphere body is long; (2) the sintering temperature of the alumina hollow sphere is low and the strength is not high

Method used

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  • Porous corundum aggregate with core-shell structure and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0018] A porous corundum aggregate with a core-shell structure and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0019] Step 1. Stir evenly 100 parts by mass of industrial alumina fine powder, 1.5-2.5 parts by mass of foaming agent, 5-10 parts by mass of aluminum dihydrogen phosphate and 5-15 parts by mass of water to prepare foam slurry.

[0020] Step 2. Put 100-140 parts of industrial alumina fine powder into the sugar coating machine, then put the foam slurry prepared in step 2 into the sugar coating machine, wet granulate, dry naturally, and bake at 100-105 °C 12-24h; then raise the temperature to 1600-1700°C and keep it warm for 2.5-3.0h to obtain a porous corundum aggregate with a core-shell structure.

[0021] The porous corundum aggregate with a core-shell structure prepared in this example has an apparent porosity of 28.7-33.2%, a compressive strength of 42.4-56.9 MPa, and a thermal shock (water cooling...

Embodiment 2

[0023] A porous corundum aggregate with a core-shell structure and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0024] Step 1. Stir evenly 100 parts by mass of industrial alumina fine powder, 1.0-1.5 parts by mass of foaming agent, 10-15 parts by mass of aluminum dihydrogen phosphate and 15-25 parts by mass of water to prepare foam slurry.

[0025] Step 2. Put 140-180 parts of industrial alumina fine powder into the sugar coating machine, then put the foam slurry prepared in step 2 into the sugar coating machine, wet granulate, dry naturally, and bake at 105-115 °C 12-24h; then raise the temperature to 1700-1800°C and keep it warm for 1.5-2.5h to obtain a porous corundum aggregate with a core-shell structure.

[0026] The porous corundum aggregate with a core-shell structure prepared in this example has an apparent porosity of 15.7-26.1%, a compressive strength of 69.1-86.3 MPa, and a thermal shock (water cooli...

Embodiment 3

[0028] A porous corundum aggregate with a core-shell structure and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0029] Step 1: Stir evenly 100 parts by mass of industrial alumina fine powder, 0.5-1.0 parts by mass of foaming agent, 15-20 parts by mass of aluminum dihydrogen phosphate and 25-35 parts by mass of water to prepare foam slurry.

[0030] Step 2. Put 160-200 parts of industrial alumina fine powder into the sugar coating machine, then put the foam slurry prepared in step 2 into the sugar coating machine, wet granulate, dry naturally, and bake at 115-120 °C 12-24h; then raise the temperature to 1800-1850°C and keep it warm for 1.0-1.5h to obtain a porous corundum aggregate with a core-shell structure.

[0031] The porous corundum aggregate with a core-shell structure prepared in this example has an apparent porosity of 10.9-15.5%, a compressive strength of 105.2-140.8 MPa, and a thermal shock (water coo...

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Abstract

The invention relates to porous corundum aggregate with a core-shell structure and a preparation method thereof. The technical scheme comprises that the preparation method comprises: uniformly stirring 100 parts by mass of industrial aluminium oxide fine powder, 0.5-2.5 parts by mass of a foaming agent, 5-20 parts by mass of aluminum dihydrogen phosphate and 5-35 parts by mass of water, so as to prepare foam mud; firstly putting 100-200 parts by mass of industrial aluminium oxide fine powder into a sugarcoating machine, then putting the foam mud into the sugarcoating machine, performing wet-process pelletizing, naturally drying, and baking at 100-120 DEG C for 12-24 h; and then heating to 1600-1850 DEG C, and keeping warm for 1-3 h, so as to obtain the porous corundum aggregate with the core-shell structure. The production technology is simple, and the prepared porous corundum aggregate with the core-shell structure is low in apparent porosity, high in strength, good in thermal-shock stability and wide in application scope.

Description

technical field [0001] The invention belongs to the technical field of porous corundum aggregate. Specifically relates to a porous corundum aggregate with a core-shell structure and a preparation method thereof. Background technique [0002] The existing corundum aggregates are divided into two types: heavy and light. Heavy corundum aggregates are usually used in parts with harsh conditions in the field of refractory materials. Light corundum aggregates include microporous corundum and alumina hollow spheres. Most of them are Used in semi-lightweight materials or thermal insulation materials. The existing heavy corundum aggregate production process is complicated and the cost is relatively high; alumina hollow spheres have a good thermal insulation effect, but their strength is not high, and the preparation of alumina hollow spheres requires a large number of high-energy-consuming equipment. [0003] At present, most methods of producing heavy corundum aggregates use high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 赵雷陈欢方伟陈辉杜星王鑫
Owner WUHAN UNIV OF SCI & TECH
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