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Preparation and microstructure of nano-size cobalt-coated Al2O3/TiC composites
Author(s): 
Pages: 1-5
Year: Issue:  3
Journal: TRANSACTIONS OF MATERIALS AND HEAT TREATMENT

Keyword:  钴包覆烧结行为力学性能工艺参数复合材料;
Abstract: 采用Co包覆Al2O3/TiC纳米级粉料进行了不同Co含量、不同烧结温度的热压烧结实验.对综合力学性能最佳的nATC8复合材料进行了工艺参数的优化,得出其优选工艺参数为,烧结温度1650℃,保温30min,热压30MPa.采用优选工艺参数制备的纳米复相陶瓷材料的硬度为92.7HRA,弯曲强度σf为782MPa,断裂韧性K1C为7.81MPa·m1/2.通过对其断口的观察,发现形成了晶内型结构,并观察到了裂纹曲折的扩展路径以及裂纹的分叉、偏转、桥联,这些有助于材料强度和韧性提高的现象.
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