Tribological Property Investigation of Self-Lubricating Molybdenum-Based Zirconia Ceramic Composite Operational at Elevated Temperature

Abstract

Three mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) with 0.5 wt% of magnesium oxide (MgO) and 6 wt% of molybdenum (Mo) were prepared by the pressureless sintering process, and the friction and wear behavior of the ceramic composite were studied against the alumina disc. Tribological tests were carried out both at room temperature as well as at an elevated temperature (500 °C). The result revealed that a substantial reduction of ∼50% in the friction coefficient and ∼31% reduction in the wear rate were achieved while 6 wt% Mo was added into the 3Y-TZP matrix operational at 500 °C. No significant tribological influence was observed with the addition of Mo at the normal operating temperature. The minimum coefficient of friction and low specific wear rate were achieved because of the formation of MoO3 in between the mating surfaces at elevated temperature. The worn surfaces were characterized by means of field emission scanning electron microscopy (FESEM). The formation of MoO3 phases was identified by wear debris analysis which was performed with the help of X-ray photoelectron spectroscopy (XPS).

Design of O-Ring with Inner Sided Restrained Arrangement

“…The groove width (mm) and depth (mm) has been represented by 'W' and 'H' respectively while the clearance between the sealing faces (mm) is represented by 'C'. The design and analysis of the O-ring has been divided into two categories: (i) Unlubricated Condition and (ii) Lubricated Condition depending on whether lubrication was provided to the O-ring prior to its installation within the groove assembly [3], [4], [13]- [22], [5], [23]- [32], [6], [33]- [42], [7], [43]- [52], [8], [53]- [62], [9], [63]- [66], [10]- [12][23], [34], [42].…”

Condition Monitoring as Tool of Engineering Management

“…The failure of one element shuts the whole system down [4][5][6]. In the past, researchers carried many works on the tribological performance of the bearings [7,8,[17][18][19][20][21][22][23][24][25][26]9,[27][28][29][30][31][32][33][34][35][36]10,[37][38][39][40][41][42][43][44][45][46]11,[47][48][49][50][51][52][53][54][55][56]12,57,58,[13]…”

Failure Modes and Effect Analysis of Gear Pair

“…- In literature many tribological studies are carried out for the failure of machine components like bearings [9,10,[19][20][21][22][23][24][25][26][27][28]11,[29][30][31][32][33][34][35][36][37][38]12,[39][40][41][42][43][44][45][46][47][48]13,[49][50][51][52][53][54][55][56][57][58]14,59,60,[15][16][17][18]and gear…”