添加碳化钛对超细Ti(C,N)–Ni金属陶瓷显微结构和力学性能的影响(英文)

EFFECT OF TITANIUM CARBIDE ADDITION ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA-FINE Ti(C, N)–Ni CERMET

用传统粉末冶金法制备了添加碳化钛(TiC)的Ti(C,N)基金属陶瓷。为了得到超细晶粒的显微结构,主要硬质相[Ti(C,N),TiC和TiN]的初始粉末粒度为纳米、亚微米级。通过扫描电子显微镜观察,发现了一种新的白芯/灰壳结构,揭示了其形成机制。此外,通过能谱仪分析,获得了各相的化学成分。用X射线衍射仪并通过计算得出了各相的点阵参数。对室温下该材料的力学性能进行了测试,并尝试把它们与金属陶瓷的原始成分和显微结构的特点联系起来。

A Ti（C, N）-based cermet with titanium carbide （TIC） additive was fabricated by the conventional powder metallurgy tech- nique. The initial powder particle sizes of the main hard phase components [Ti（C, N）, TiC and TiN] were nano/submicron-sized, in order to achieve an ultra-fine grain sizes microstructure. Through scanning electron microscopy observation, a new kind of bright core and grayish rim structure was detected, and its formation mechanism was proposed. In addition, quantitative information about the chemical composition of various phases was obtained by energy dispersive X-ray analysis. Phase identification was carried out by X-ray diffraction and the lattice parameter of each phase was calculated. The mechanical properties at room temperature were also tested, in order to correlate them with the cermet＇s starting composition and microstructural features.