Preparation of AlN matrix composites using an infiltration and reaction approach
Preparation of AlN matrix composites using an infiltration and reaction approach
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DOI：
10.1016/j.matchemphys.2005.08.056
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发表时间：
2006-06
影响因子：
4.6
通讯作者：
Jingzhong Zhao;Jiqiang Gao;Z. Jin
中科院分区：
文献类型：
--
作者：
Jingzhong Zhao;Jiqiang Gao;Z. Jin
采用新方法制备了氮化铝（AlN）基复合材料。在1450℃的N2中烧结制备了含si3n4和al2o3的多孔预制体。然后，将Al-10Si-5Mg合金熔液在850℃和950℃的空气中渗透到预成形件中，采用无压金属渗透工艺形成陶瓷/金属复合材料。最后，将渗as的复合材料在空气中热处理至1200℃以上，形成AlN基复合材料。结果表明：在850℃和950℃时，将熔融Al合金渗透到多孔预铸件中，si3n4与Al反应生成AlN；在1200℃和1300℃热处理后，复合材料中存在大量AlN相。该复合材料的硬度高于传统工艺制备的AlN。采用扫描电镜（SEM）、能谱仪（EDS）和x射线衍射仪（XRD）对复合材料的显微组织和相组成进行了观察和分析。
Aluminum nitride (AlN) matrix composites were prepared by a novel approach. Porous preforms containing Si3N4and Al2O3were fabricated after sintered at 1450°C in N2. Then, molten Al–10Si–5Mg alloy was infiltrated into preforms in air at temperature of 850 and 950°C to form ceramic/metal composites using the pressure less metal infiltration process. Finally, the as-infiltrated composites were heat-treated to over 1200°C in air in order to form AlN matrix composites. The test results shown that Si3N4had reacted with Al to form AlN when molten Al alloy was infiltrated into the porous preforms at 850 and 950°C, a large amount of AlN phase in the composite was detected after heat-treated at 1200 and 1300°C. The composites had higher hardness than that of AlN made by traditional processing. The composite microstructures and its phase makeup were observed and analyzed by SEM, EDS and XRD.