Effects of Treated Nano-Lanthanum Oxide on the Mechanical and Tribological Properties of PTFE Nanocomposites  

作　　者：汪怀远 冯新 史以俊 陆小华 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing University of Technology

出　　处：《Journal of Rare Earths》2007年第S2期40-44,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (20676062 ,20376032);National High-Tech Research Development Program(863 Program:2003AA333010 ,2006AA03Z455)

摘　　要：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.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.

关 键 词：PTFE nanocomposites surface modification tribological and mechanical properties rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]