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Thermal shock resistant magnesium spinel brick and preparation method thereof
The invention provides a thermal shock resistant magnesium spinel brick and a preparation method thereof. In a using process of the magnesium spinel brick, a TiC and B4C non-oxide phase and a MgFe2O4 and Mg2TiO4 composite oxide solid solution phase are generated therein; the magnesium spinel brick is prepared from the following raw materials in percentage by weight: 70-85% of fused magnesite particles and fine powders, 3-10% of nano aluminum magnesium spinel powder, 3-6% of alpha-Al2O3 micro powder, 2-8% of aluminum powder, 0.5-10% of nano titanium oxide and 2-5% of boric acid, wherein the addition amount of a carbon-containing additive is 2.8-5.2% of the total weight of fused magnesite, nano aluminum magnesium spinel powder, alpha-Al2O3 micro powder, aluminum powder, nano titanium oxide and boric acid. The thermal shock residual strength ratio of the magnesium spinel brick is 30% higher than that of a Cr26 magnesium brick in the prior art, the high-temperature bending resistance reaches more than 15MPa, the normal temperature compression strength reaches more than 170MPa, the service life is longer, and the safety and the reliability are attractive.
Thermal shock resistant magnesium spinel brick and preparation method thereof
The invention provides a thermal shock resistant magnesium spinel brick and a preparation method thereof. In a using process of the magnesium spinel brick, a TiC and B4C non-oxide phase and a MgFe2O4 and Mg2TiO4 composite oxide solid solution phase are generated therein; the magnesium spinel brick is prepared from the following raw materials in percentage by weight: 70-85% of fused magnesite particles and fine powders, 3-10% of nano aluminum magnesium spinel powder, 3-6% of alpha-Al2O3 micro powder, 2-8% of aluminum powder, 0.5-10% of nano titanium oxide and 2-5% of boric acid, wherein the addition amount of a carbon-containing additive is 2.8-5.2% of the total weight of fused magnesite, nano aluminum magnesium spinel powder, alpha-Al2O3 micro powder, aluminum powder, nano titanium oxide and boric acid. The thermal shock residual strength ratio of the magnesium spinel brick is 30% higher than that of a Cr26 magnesium brick in the prior art, the high-temperature bending resistance reaches more than 15MPa, the normal temperature compression strength reaches more than 170MPa, the service life is longer, and the safety and the reliability are attractive.
Thermal shock resistant magnesium spinel brick and preparation method thereof
ZHANG XINGYAN (Autor:in) / BI CHANGLU (Autor:in) / LI YOUQI (Autor:in) / KOU ZHIQI (Autor:in) / ZHAO JIZENG (Autor:in)
27.05.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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