Microstructure and tribological properties of ZrO2(Y2O3) matrix composites doped with different solid lubricants from room temperature to 800 °C

Ni3Al Matrix Composite with Lubricious Tungstate at High Temperatures

“…A series of self-lubricating composites based on nickel alloys and ceramics have been developed in recent years by plasma spraying or powder metallurgy methods [1][2][3][4][5][6][7][8][9]. A Ni-based high-temperature self-lubricating composite known as PM 304 has been developed that shows good tribological behavior over a wide range of temperatures (room temperature to 650°C) [6]; however, above 800°C, declines in its mechanical properties reduce its wear resistance.…”

“…A Ni-based high-temperature self-lubricating composite known as PM 304 has been developed that shows good tribological behavior over a wide range of temperatures (room temperature to 650°C) [6]; however, above 800°C, declines in its mechanical properties reduce its wear resistance. Ceramic matrix self-lubricating composites based on Cr 3 C 2 , Al 2 O 3 , Si 3 N 4 , and ZrO 2 -Y 2 O 3 also exhibit excellent friction and wear behavior within 800°C and may achieve higher application temperatures [1,2,[7][8][9], but their inherent brittleness restricts the manufacture of complex shapes and the reliability of applications. However, intermetallic materials possess excellent high-temperature combination properties [10][11][12][13] and may, therefore, be a superior matrix for hightemperature self-lubricating composites.…”

High Temperature Self-Lubricating Materials

“…It was reported that the additives of graphite, MoS2, BaF2, CaF2, Ag, Ag2O, Cu2O, BaCrO4, BaSO4, SrSO4 and CaSiO3 were incorporated into zirconia ceramics, respectively, to evaluate their potentials as effective solid lubricants over a wide operating temperature range [13,[86][87][88]. It was found that the ZrO2 (Y2O3) composites incorporated with SrSO4 exhibited low steady-state friction coefficients of less than 0.2 and small wear rates in the order of 10 −6 mm 3 /Nm at low sliding speed from room temperature to 800 °C.…”

“…Yet, the efforts to explore novel high temperature self-lubricating materials possessing favorable frictional property and superior wear resistance abilities have never stopped. As a result, great strides have been made in recent years in the fabrication and diverse utilization of new high temperature self-lubricating materials that are capable of satisfying the multifunctional needs of more advanced mechanical systems [10][11][12][13][14][15]. The following tribological issues addressed in this chapter are presented:…”

Tribological Properties of Spark-Plasma-Sintered ZrO2(Y2O3)–Al2O3–Ba x Sr1−x SO4 (x = 0.25, 0.5, 0.75) Composites at Elevated Temperature

“…A series of self-lubricating ZrO 2 (Y 2 O 3 ) matrix composites based on these solid lubricants were developed by powder metallurgy or plasma spraying methods [8][9][10][11][12]. Selflubricating ZrO 2 (Y 2 O 3 ) matrix composites with MoS 2 synthesized by powder metallurgy provided very low friction and wear at low temperatures, however, a severe wear was found at 600°C or above because of the oxidation of MoS 2 [8]. A ZrO 2 (Y 2 O 3 ) matrix composites doped with BaF 2 /CaF 2 eutectic lubricant were investigated in dry sliding against alumina ball from 25 to 800°C, and only exhibited good friction and wear properties above 400°C [8].…”