TY - GEN
T1 - Tribological analysis of thermal spray coatings of ni and AL2O3 with dispersion of solid lubricants in wear modes
AU - Christy, John V.
AU - Mourad, Abdel Hamid I.
AU - Tiwari, Sudhir
N1 - Publisher Copyright:
© Copyright 2017 ASME.
PY - 2017
Y1 - 2017
N2 - In the present work, Ni and 60 wt. % of AL2O3, as thermal spray was mixed in 2:1 proportion with entrapped solid lubricant such as PTFE and Graphite through a D-Gun on the Bakelite used as substrate. For that, the specimen was taken and cleaned properly and coated with thermal spray and solid lubricating coatings of 0.5 micrometre thickness. At elevated temperatures, NiAL2O3 a common thermal spray coating protects the solid lubricants entrapped in it and thus causes the layer to be stable and dynamic. The solid lubricants mixed in thermal spray were graphite and PTFE. These were then ultrasonically cleaned in the acetone bath. The coating is done by a duo spray pump that spurts the coating on the work piece. This pump spurting is controlled by a semi permeable membrane coated on the work piece. Coatings were tested at different air pressure, temperature and impingement angle. It was found that the degradation of coating was observed on low impingment angles and also with the reciprocating stress inputs. The Graphite and NiAL2O3 coating is found to be more stable tribologically as compared to PTFE and NiAL2O3 coating at high temperatures and pressures. Morphological analysis of coatings was also done. The coating was tested on cutting tool ends like drill bits, planar cutting tool and turning tools. Separate analysis was carried out on erosive wear, abrasive wear, temperature and pressure with varied load conditions on the coatings done on Bakelite. On all the individual tests done Graphite and NiAL2O3 mix coating was found stable. This coating finds much more application in pipes and pressure vessels systems. The inside bore of a pipe can be coated similarly which will smoothly transfer the abrasive sludge or fluids with much reduction on its friction coefficient.
AB - In the present work, Ni and 60 wt. % of AL2O3, as thermal spray was mixed in 2:1 proportion with entrapped solid lubricant such as PTFE and Graphite through a D-Gun on the Bakelite used as substrate. For that, the specimen was taken and cleaned properly and coated with thermal spray and solid lubricating coatings of 0.5 micrometre thickness. At elevated temperatures, NiAL2O3 a common thermal spray coating protects the solid lubricants entrapped in it and thus causes the layer to be stable and dynamic. The solid lubricants mixed in thermal spray were graphite and PTFE. These were then ultrasonically cleaned in the acetone bath. The coating is done by a duo spray pump that spurts the coating on the work piece. This pump spurting is controlled by a semi permeable membrane coated on the work piece. Coatings were tested at different air pressure, temperature and impingement angle. It was found that the degradation of coating was observed on low impingment angles and also with the reciprocating stress inputs. The Graphite and NiAL2O3 coating is found to be more stable tribologically as compared to PTFE and NiAL2O3 coating at high temperatures and pressures. Morphological analysis of coatings was also done. The coating was tested on cutting tool ends like drill bits, planar cutting tool and turning tools. Separate analysis was carried out on erosive wear, abrasive wear, temperature and pressure with varied load conditions on the coatings done on Bakelite. On all the individual tests done Graphite and NiAL2O3 mix coating was found stable. This coating finds much more application in pipes and pressure vessels systems. The inside bore of a pipe can be coated similarly which will smoothly transfer the abrasive sludge or fluids with much reduction on its friction coefficient.
KW - Erosion
KW - Solid lubricant abrasion pressure vessels pipes drill bit
KW - Thermal coating
KW - Wear
UR - http://www.scopus.com/inward/record.url?scp=85034060244&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85034060244&partnerID=8YFLogxK
U2 - 10.1115/PVP2017-65460
DO - 10.1115/PVP2017-65460
M3 - Conference contribution
AN - SCOPUS:85034060244
T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
BT - Materials and Fabrication
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2017 Pressure Vessels and Piping Conference, PVP 2017
Y2 - 16 July 2017 through 20 July 2017
ER -