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利用鋁灰和粉煤灰鋁熱還原氮化制備鎂鋁尖晶石-剛玉-Sialon復(fù)相材料

發(fā)布時間: 2012-09-15 10:42 查看: 2504次

鋁灰粉煤灰鋁熱還原氮化尖晶石-剛玉-Sialon復(fù)相材料
摘要：

以鋁灰和粉煤灰為原料,以鋁灰中的金屬鋁為還原劑在1550 ℃,3 h下進(jìn)行原位鋁熱還原氮化制備鎂鋁尖晶石-剛玉-Sialon復(fù)合材料.采用XRD分析了不同原料配比對合成產(chǎn)物物相的影響,并對制備的鎂鋁尖晶石-剛玉-Sialon復(fù)相材料進(jìn)行了顯微形貌和性能表征.結(jié)果表明,當(dāng)鋁灰過量50%時,制備得到了鎂鋁尖晶石-剛玉-Sialon復(fù)合耐高溫材料,其中,尖晶石為富鋁尖晶石,含量為45%;剛玉含量為25%,呈板片狀;Sialon的含量為26%,其Z值為4,呈柱狀形貌.此時其抗折強(qiáng)度最大,為183 MPa,顯氣孔率最小,為5.3%,體積密度為2.6 g/cm~3,洛氏硬度HRB的值為123.

Abstract：

The spinel-corundum-sialon composite materials were prepared from fly ash and aluminum dross by in-situ aluminothermic reduction-nitration. The phase composition, content and microstructure of composites were investigated by XRD and SEM with EDS. The properties of composites were also characterized. The results showed that when aluminum dross exceeded 50%, the spinel-corundum-Sialon composite materials were prepared successfully at 1550 ℃ for 3 h, in which the content of phases were 45% of allitic spinel, 25% of corundum and 26% of Sialon with Z=4. The patterns of phases were octahedral structure of allitic spinel, platy corundum, columnar crystals of sialon. When aluminum dross exceeded 50%, the bending strength of the prepared spinel-corundum-Sialon composites reached the maximum of 183 MPa, the apparent porosity was the minimum of 5.3%, the bulk density was 2.6 g/cm~3 and HRB hardness was 123.

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