The surface of nano-La2O3 was modified. Effects of various amount of treated nano-La2O3 on the mechanical and tribological properties of PTFE were investigated. Mechanisms that contribute to the properties of PTFE com...The surface of nano-La2O3 was modified. Effects of various amount of treated nano-La2O3 on the mechanical and tribological properties of PTFE were investigated. Mechanisms that contribute to the properties of PTFE composites are also studied. Results indicate that treated nano-La2O3 can increase the mechanical and tribological properties of PTFE simultaneously. With 1wt.% of treated nano-La2O3, the rigidity, tensile strength, notched impact and wear resistance of PTFE nanocomposites were increased by 25.1%, 14.1%, 20.3% and 36.7% respectively over pure PTFE. The degradation temperature of PTFE was improved by 14 ℃ by adding only 5% nano-La2O3. The wear resistance reached the highest value when the composite contained 10% treated nano-La2O3, which is about 110 times higher than pure PTFE. Furthermore, treated nano-La2O3 strengthened the bonding between the transfer film and the counterpart surface. A coherent and smooth transfer film on the counterpart surface of PTFE composites can be observed, while pure PTFE can not do.展开更多
基金Project supported by the National Natural Science Foundation of China (20676062 ,20376032)National High-Tech Research Development Program(863 Program:2003AA333010 ,2006AA03Z455)
文摘The surface of nano-La2O3 was modified. Effects of various amount of treated nano-La2O3 on the mechanical and tribological properties of PTFE were investigated. Mechanisms that contribute to the properties of PTFE composites are also studied. Results indicate that treated nano-La2O3 can increase the mechanical and tribological properties of PTFE simultaneously. With 1wt.% of treated nano-La2O3, the rigidity, tensile strength, notched impact and wear resistance of PTFE nanocomposites were increased by 25.1%, 14.1%, 20.3% and 36.7% respectively over pure PTFE. The degradation temperature of PTFE was improved by 14 ℃ by adding only 5% nano-La2O3. The wear resistance reached the highest value when the composite contained 10% treated nano-La2O3, which is about 110 times higher than pure PTFE. Furthermore, treated nano-La2O3 strengthened the bonding between the transfer film and the counterpart surface. A coherent and smooth transfer film on the counterpart surface of PTFE composites can be observed, while pure PTFE can not do.
