Synthesized compound sillimanite products and preparation method thereof

A technology of sillimanite and products, which is applied in the field of refractory materials, can solve the problems of affecting service life, high apparent porosity, difficult to eliminate air bubbles, etc., and achieve the effect of ensuring product quality, low apparent porosity and long service life

Inactive Publication Date: 2004-03-24
殷若博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current sillimanite products still have the following problems: the bulk density is small, 2.15-2.25g / cm 3 , it is difficult to reach 2.3g / cm 3 ;The apparent porosity is high, 25-28%, and there are large bubbles of Φ2-Φ8mm. Although some manufacturers adopted vacuum technology later, they only eliminated some of the bubbles above Φ3mm, and it is difficult to eliminate the bubbles below Φ2mm; thermal stability Poor performance, preheating is required when using, which is cumbersome and inconvenient, and directly affects the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Synthetic composite sillimanite product of the present invention, its crystalline phase weight percentage is composed of:

[0056] Mullite crystal phase 79%, corundum 8%, high silica glass phase 13%.

[0057] Its batching weight percentage is composed of:

[0058] 30% of α-alumina powder, 10% of tabular corundum particles, 8% of silica powder, 40% of mullite aggregate, 12% of mullite powder, plus 0.5% of fused magnesia powder.

[0059] Each ingredient has the following requirements:

[0060] α-alumina: industrial grade α-alumina;

[0061] Tabular alumina: industrial first-grade tabular alumina;

[0062] Silicon dioxide: SiO 2 ≥96%;

[0063] Mullite: Al 2 o 3 ≥48%, Fe 2 o 3 ≤0.8%, K 2 O+Na 2 O≤0.5%, CaO+MgO≤0.8%, Al 2 o 3 +SiO2 2 ≥98%.

[0064] The preparation method includes batching, molding and firing, and the particle weight gradation of the batching is:

[0065] Micropowder:

[0066] α-alumina powder: powder with particle size d≤1um 7%...

Embodiment 2

[0092] Synthetic composite sillimanite product of the present invention, its crystalline phase weight percentage is composed of:

[0093] Mullite crystal phase 80%, corundum 7%, high silica glass phase 13%.

[0094] Its batching weight percentage is composed of:

[0095] 29% of α-alumina powder, 11% of tabular corundum particles, 9% of silica powder, 39% of mullite aggregate, 11.6% of mullite powder, and 0.4% of fused magnesia powder.

[0096] The particle weight gradation of the ingredients is:

[0097] Micropowder:

[0098] α-alumina powder: powder with particle size d≤1um 8%

[0099] 1um

[0100] 9um

[0101] 20um

[0102] 32um

[0103] 44um

[0104] aggregate:

[0105] Mullite aggregate: 0.4mm<particle size d≤0.8mm granular material 33%

[010...

Embodiment 3

[0118] Synthetic composite sillimanite product of the present invention, its crystalline phase weight percentage is composed of:

[0119] Mullite crystal phase 77%, corundum 9%, high silica glass phase 14%.

[0120] Other process parameters are:

[0121] Its batching weight percentage is composed of:

[0122] 30% of α-alumina powder, 10% of tabular corundum particles, 8.4% of silica powder, 40% of mullite aggregate, 11% of mullite powder, and 0.7% of fused magnesia powder.

[0123] The particle weight gradation of the ingredients is:

[0124] Micropowder:

[0125] α-alumina powder: powder with particle size d≤1um 6%

[0126] 1um

[0127] 9um

[0128] 20um

[0129] 32um

[0130] 44um

[0131] aggregate:

[0132] Mullite aggregate: 0.4mm

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Abstract

The invented synthetic composite sillimanite product is a composte body formed from mullite crystal phase as main material and corundom phase and high silica glass as auxiliary material, and its composition includes (wt%) 28-32% of alpha-alumina powder, 8-12% of plate corundom granules, 7-10% of silicon dioxide powder, 38-42% of mullite aggregate, 8-14% of mullite powder, and 0.2-0.8% of fused magnesite powder. Its preparation adopts gel forming method including the following steps: firstly, preparing monomer premixed liquor, adding micropowder materials, ball-grinding to make slurry, adding aggregate, initiator and defoaming agent, stirring and mixing them uniformly to obtain suspension body, finally, pouring it into mould and forming so as to obtain the invented sillimanite product.

Description

technical field [0001] The invention relates to a synthetic composite sillimanite product and a preparation method thereof, belonging to the technical field of refractory materials. Background technique [0002] With the continuous development of market demand and technology, refractory materials have also been greatly improved and gratifying progress has been made. As a special refractory material, sillimanite products have a wider application space, and are mostly used in the glass industry, electronic component industry, and magnetic material industry. However, the current sillimanite products still have the following problems: the bulk density is small, 2.15-2.25g / cm 3 , it is difficult to reach 2.3g / cm 3 ;The apparent porosity is high, 25-28%, and there are large bubbles of Φ2-Φ8mm. Although some manufacturers adopted vacuum technology later, they only eliminated some of the bubbles above Φ3mm, and it is difficult to eliminate the bubbles below Φ2mm; thermal stability...

Claims

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Application Information

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IPC IPC(8): C04B35/18C04B35/622C04B35/624C04B35/66
Inventor 殷若博
Owner 殷若博
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