电场辅助原位合成TiB_2-TiC-Ni/TiAl/Ti功能梯度材料及界面结构

In situ synthesis of TiB_2-TiC-Ni/TiAl/Ti functionally graded materials by FAPAS and structural characteristics of the interface

采用电场激活压力辅助合成技术(FAPAS)并结合原位反应的方法制备TiB2-TiC-Ni/TiAl/Ti功能梯度材料,研究了TiB2-TiC-Ni/TiAl/Ti功能梯度材料的界面微结构特征及其结合强度,分析了梯度材料界面的微观组织和元素分布,并分析了试样的抗剪切强度和显微硬度。研究表明:制备的TiB2-TiC-Ni/TiAl/Ti功能梯度材料组织致密,TiB2-TiC复合陶瓷晶粒细小且均匀分布;各层界面区形成了良好的扩散冶金结合,连接区剪切强度达85.878 MPa。显微硬度由钛板到陶瓷层呈梯度变化,表层最大显微硬度达HV2760。

Field-activated pressure-assisted synthesis（FAPAS） combining in-situ synthesis method was used to prepare TiB2-TiC-Ni/TiAl/Ti functionally graded materials.Interfacial microstructure and bonding strength of materials have been mainly investigated.The microstructure and distribution of element of interface was analyzed.The shear strength and micro-hardness were also tested.The results show that the grains of TiB2-TiC composite ceramics prepared by FAPAS are fine and homogeneous distribution.The interface forms closely combination and the elements appear mutual diffusion,which forms good metallurgical bonding and the maximum shear strength of joint reaches 85.878 MPa.The micro-hardness of the sample changes gradually from titanium substrate to the cermet,and the maximum hardness of the surface up to HV2760.