摘要
采用热压烧结工艺制备了碳化钛复合材料。选用扫描电镜(SEM)观察试样的表观形貌与断口形貌,分别检测了其力学性能,以X射线衍射仪(XRD)对复合材料的成分进行了表征并对其抗氧化性能进行了分析。结果显示,在碳化钛材料中添加WC改善了其显微结构和力学性能,WC颗粒在TiC基体材料中离散补强增韧以及金属组分的强韧化,有助于TiC复合材料综合性能的提升。试样S4在WC添加量达到15 wt.%时最优,材料的断裂面显微组织细密、晶界分布明显、裂纹扩张路线走向清晰。金属相的韧化与碳化物硬质相在基体中弥散增韧协同效应提高了TiC复合材料的韧性。力学性能分别为:维氏硬度21.7 GPa,弯曲强度1139 MPa,断裂韧性9.8 MPa·m^(1/2),相对密度99.2%。在所设定的1150℃及保温2 h条件氧化后,热压烧结工艺制备的试样表面形成了一层对基体具有保护效果的致密性氧化膜,所形成的完全氧化层层厚大概为52.3μm,过渡层层厚为22.8μm左右。
Titanium carbide(TiC)composites were fabricated by using hot pressing sintering process.The fracture morphology and apparent morphology were observed by using scanning electron microscopy(SEM).Mechanical properties of the samples were evaluated.X-ray diffraction(XRD)was used to characterize the phase composition of the composites.The oxidation behavior of the samples was also discussed.The microstructure and mechanical properties of the titanium carbide materials were improved due to the addition of WC.The discrete reinforcing of WC particles in the TiC matrix and the strengthening and toughening of metal components contributed to the improvement in comprehensive properties of the TiC composites.The sample S4 with 15 wt.% WC had the optimized performance,owing to the synergistic effect of the metal phase malleabled and the carbide hard phase dispersed in the matrix,with hardness of 21.7 GPa,bending strength of 1139 MPa,fracture toughness of 9.8 MPa·m^(1/2) and relative density of 99.2%.Under the oxidation conditions at 1150℃for 2 h,a relatively dense oxide layer was formed on the surface of the samples.The layer thicknesses of the oxidation layer and the transitional layer are about 52.3μm and 22.8μm,respectively.
作者
李少峰
LI Shaofeng(Ningbo Donglian Seals Co.,LTD.,Ningbo 315191,Zhejiang,China)
出处
《陶瓷学报》
CAS
北大核心
2022年第1期100-106,共7页
Journal of Ceramics
基金
宁波市科技创新2025重大专项(2020Z112)。
关键词
碳化钛
复合材料
热压烧结
抗氧化性能
titanium carbide
composites
hot pressing sintering
oxidation resistance
