CAJ | 학술논문

以铝灰和粉煤灰为原料,以铝灰中的金属铝为还原剂在1550 ℃,3 h下进行原位铝热还原氮化制备镁铝尖晶石-刚玉-Sialon复合材料.采用XRD分析了不同原料配比对合成产物物相的影响,并对制备的镁铝尖晶石-刚玉-Sialon复相材料进行了显微形貌和性能表征.结果表明,当铝灰过量50%时,制备得到了镁铝尖晶石-刚玉-Sialon复合耐高温材料,其中,尖晶石为富铝尖晶石,含量为45%;刚玉含量为25%,呈板片状;Sialon的含量为26%,其Z值为4,呈柱状形貌.此时其抗折强度最大,为183 MPa,显气孔率最小,为5.3%,体积密度为2.6 g/cm~3,洛氏硬度HRB的值为123.
이려회화분매회위원료,이려회중적금속려위환원제재1550 ℃,3 h하진행원위려열환원담화제비미려첨정석-강옥-Sialon복합재료.채용XRD분석료불동원료배비대합성산물물상적영향,병대제비적미려첨정석-강옥-Sialon복상재료진행료현미형모화성능표정.결과표명,당려회과량50%시,제비득도료미려첨정석-강옥-Sialon복합내고온재료,기중,첨정석위부려첨정석,함량위45%;강옥함량위25%,정판편상;Sialon적함량위26%,기Z치위4,정주상형모.차시기항절강도최대,위183 MPa,현기공솔최소,위5.3%,체적밀도위2.6 g/cm~3,락씨경도HRB적치위123.
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.