Preparation and Tribological Behavior of Ti2AlNb/Ag Self-Lubricating Composites

Microhardness, compression performance and high‐temperature tribological properties of Ti2AlNb‐silver self‐lubricating composite

“…On the contrary, the protective oxide layer formed at high temperature improves the wear resistance of the alloy, but there may be a transition temperature that varies with the materials [32, 41–43]. Comparing the friction coefficients at room temperature and 500 °C, it is found that oxides have a positive effect on the friction reduction of Ti 2 AlNb‐silver composites, especially for low‐silver samples [31]. This is because the silver is too little to form a continuous film alone and oxides have supplemented it.…”

“…In the microscopic morphology of TA5, TA10 and TA15 composites, small island‐like white substances were observed at the junctions of Ti 2 AlNb pre‐alloyed powder particles, which were confirmed to be silver by phase constitution analysis, Figure 3. After ball milling, the tiny silver balls are uniformly attached to the surface of the larger Ti 2 AlNb particles [31]. The silver flows between the Ti 2 AlNb pre‐alloyed powder particles and aggregates into islands because the sintering temperature is 1100 °C higher than its melting point (961.78 °C).…”

“…In previous work, the Ti 2 AlNb‐silver self‐lubricating composite material was successfully prepared by spark plasma sintering, and the room‐temperature friction and wear properties were reported [31]. The results suggested that the anti‐friction and anti‐wear abilities of the composite material were significantly improved by a dense silver‐rich lubricating film on the surface.…”

“…The mixed powder was filled into a graphite mold with an inner diameter of 20 mm, a load of 50 MPa was applied, and the temperature was raised to 1100 °C at a heating rate of 100 °C/min, kept for 10 minutes, and then cooled to room temperature in the furnace. Finally, sintered composite materials with a size of Ø 20 mm × (10∼12) mm were obtained [31, 35]. According to the Ag content of 0, 5 wt%, 7 wt%, 10 wt% and 15 wt%, the composite materials were named TA0 (Ti 2 AlNb alloy), TA5, TA7, TA10 and TA15, respectively.…”

Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture

“…The addition of ceramic particles, short fiber and whisker into the soft matrix via a specific preparation procedure is an effective method for improving the mechanical properties of Ti 2 AlNb alloys. By the strengthening effect of these stiff reinforcements (such as Ag [9], graphene [10,11], TiC [12][13][14], TiB [15][16][17], etc. ), the mechanical [7,8], wear [11], fatigue [4,18] and creep [8] properties of Ti 2 AlNb alloys can be significantly improved without sacrificing or with slight degrading of other properties.…”