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
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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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