Enhancement of Dry Sliding Tribological Characteristics of Perforated Zirconia Toughened Alumina Ceramic Composite Filled With Nano MoS2 in High Vacuum

Abstract

An innovative approach was adopted for fabricating ZTA–MoS2 self-lubricating ceramic composite with inclusion of hydrothermally synthesized nano MoS2 through the pores of perforated ZTA ceramics. This method avoided the exposure of MoS2 in high temperature environment due to its in-sensitiveness during traditional sintering techniques. Different weight percentages (wt.%: 0, 5, 10 and 15) of graphite were incorporated to produce porous ZTA ceramic by means of cold press sintering followed by insertion of nano MoS2 into the matrix. Best tribological characteristics was obtained with 10 wt% graphite-ZTA-MoS2 specimen which offered an improvement of ~66% in coefficient of friction and ~96% in specific wear rate when dry sliding tests were carried out against Si3N4 in high vacuum(5.0×10−4 mbar). Nano MoS2 was sheared off at the contacting interface during sliding under load to provide tribological enhancement of the composite. Delamination was found as the dominating wear mechanism in ZTA-MoS2 composite during wear test.

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…”

Little amounts of carbon nanotubes as anti‐wear reinforcement for alumina in dry sliding

“…2,3 Modern design philosophy advocates the reinforcement of ceramic matrices with suitable secondary phases to overcome these hurdles. The inclusion of lubricating phases, such as zinc oxide (ZnO), 4 molybdenum (Mo), 5,6 molybdenum disulphide (MoS 2 ), 7 carbon nanotubes (CNTs), 3 and graphene, 8,9 makes engineering steels and ceramics suitable for usage across a wide range of loading, temperatures, pressures, and other service conditions.…”