Synthesis of TiB2-TiC-Ni/TiAl/Ti functionally gradient materials by FAPAS process

Abstract

Field-activated pressure-assisted synthesis (FAPAS) was used to prepare TiB 2 -TiC-Ni/TiAl/Ti functionally gradient materials. Interfacial microstructure and bonding strength of materials were mainly investigated. The microstructure, phase composition and distribution of elements of interface were analyzed by SEM, XRD and EDS. The shear strength and micro-hardness were also tested. The results show that the particles of TiB 2 -TiC composite ceramics prepared by FAPAS are fine and homogeneous disperse. Closely metallurgical bonding forms between layers by mutual diffusion of different elements across the interfaces. The maximum shear strength of joint reaches 85.878 MPa and the fracture occurs at the interface of cermet and TiAl. The micro-hardness of the sample changes gradually from titanium substrate to the cermet with a maximum hardness of 2760HV in the cermet.

Heterogeneous material joining of sapphire and TC4 alloy with a functionally graded interface

“…The formation of TiAl or Ti 3 Al depended on the diffusion quantity of Al element. When the diffusion quantity of TiAl was small, Ti 3 Al was formed preferentially 26,27 …”

“…When the diffusion quantity of TiAl was small, Ti 3 Al was formed preferentially. 26,27 SAED was performed in different areas of the interface between Al 2 O 3 and Ti (near Ti side) in Figure 8. TiAl alloy phase and TiO phase appeared in the Ti matrix, as indicated in the EDS spectrum at the interface between Al 2 O 3 and Ti.…”

Effect of Ni content on microstructures and mechanical properties of hot-pressed TiC–TiB2–Ni composite

“…However, TiC-TiB 2 composites are very difficult to fabricate by conventional sintering methods due to their high melting points (3067°C and 2980°C, respectively) and low self-diffusion coefficients [13]. In recent years TiC-TiB 2 composites have attracted much attentions and many material reseachers tried to obtain low-cost and highperformance TiC-TiB 2 composite using various preparing methods [14][15][16][17][18][19][20]. Locci et al using Ti, B 4 C and C as raw materials obtained TiC-TiB 2 composite with a relative density of 98% at 1700°C by SPS method [21].…”

Fabrication of Multiple Ceramic Particle Reinforced Iron Matrix Coating by Laser Cladding

“…Ceramic particle reinforced metal matrix composites have been widely used to withstand wear environments [1,2]. Since TiB 2 and TiC ceramics possess low friction coefficient, high hardness, and good wetting behavior with metal matrix, they have received considerable interest in the world [3][4][5]. In general, there are mainly two techniques available to produce the metal matrix composites.…”