TY - JOUR
T1 - Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66
AU - Hunke, Harald
AU - Soin, Navneet
AU - Gebhard, Andreas
AU - Shah, Tahir
AU - Kramer, Erich
AU - Witan, Kurt
AU - Narasimulu, Anand Arcot
AU - Siores, Elias
PY - 2015/6/11
Y1 - 2015/6/11
N2 - Tribological and mechanical properties of α-olefin-copolymer, impact-modified Polyamide 66, containing pristine and plasma treated Polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. The PTFE powders were subjected to low pressure 2.45GHz microwave plasma treatment with H2 and NH3 as the process gases to aid their dispersion in PA66. Formation of polar surface groups in conjunction with significant defluorination was observed for both H2 (F/C atomic ratio 1.30) and NH3 (F/C atomic ratio 1.13) plasma treated powders. The H2 PTFE-impact modified PA66 composites exhibited a 25% increase in their impact energy absorption capabilities (25.0J) than their pristine counterparts (20.0J), along with a significant reduction of the specific wear rate at higher pv-values. At the pv-value of 6MPam/s, the specific wear rates for composites containing hydrogen plasma treated PTFE and nitrogen plasma treated PTFE were reduced by 33% (0.7×10-6mm3/Nm) and 50% (0.6×10-6mm3/Nm), respectively, as compared to pristine PTFE-α-olefin PA66 composites (1.1×10-6mm3/Nm); while showing similar coefficient of friction values. The use of plasma functionalized PTFE powders thus provides a facile route for the production of impact modified PA66 compounds with significantly lower coefficient of friction and higher wear resistance for applications like bearings and sliding elements where impact strength as well as good tribological properties are required.
AB - Tribological and mechanical properties of α-olefin-copolymer, impact-modified Polyamide 66, containing pristine and plasma treated Polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. The PTFE powders were subjected to low pressure 2.45GHz microwave plasma treatment with H2 and NH3 as the process gases to aid their dispersion in PA66. Formation of polar surface groups in conjunction with significant defluorination was observed for both H2 (F/C atomic ratio 1.30) and NH3 (F/C atomic ratio 1.13) plasma treated powders. The H2 PTFE-impact modified PA66 composites exhibited a 25% increase in their impact energy absorption capabilities (25.0J) than their pristine counterparts (20.0J), along with a significant reduction of the specific wear rate at higher pv-values. At the pv-value of 6MPam/s, the specific wear rates for composites containing hydrogen plasma treated PTFE and nitrogen plasma treated PTFE were reduced by 33% (0.7×10-6mm3/Nm) and 50% (0.6×10-6mm3/Nm), respectively, as compared to pristine PTFE-α-olefin PA66 composites (1.1×10-6mm3/Nm); while showing similar coefficient of friction values. The use of plasma functionalized PTFE powders thus provides a facile route for the production of impact modified PA66 compounds with significantly lower coefficient of friction and higher wear resistance for applications like bearings and sliding elements where impact strength as well as good tribological properties are required.
KW - Impact modification
KW - Plasma treatment
KW - Polyamide 66
KW - Polytetrafluoroetyhlene (PTFE)
KW - Solid lubricants
KW - Wear
UR - http://www.scopus.com/inward/record.url?scp=84934899741&partnerID=8YFLogxK
U2 - 10.1016/j.wear.2015.06.003
DO - 10.1016/j.wear.2015.06.003
M3 - Article
AN - SCOPUS:84934899741
SN - 0043-1648
VL - 338-339
SP - 122
EP - 132
JO - WEAR
JF - WEAR
ER -