摘要
采用丁二烯合成出端异氰酸酯基聚丁二烯液体橡胶,采用端异氰酸酯基聚丁二烯液体橡胶与环氧树脂E51反应制备端异氰酸酯基液体聚丁二烯橡胶-环氧树脂聚合物(ETPB),同时在其中进一步填充5%和10%(质量分数)纳米A l2O3,在45#钢底材上制备出环氧树脂、改性环氧树脂及填充5%和10%纳米A l2O3的聚合物复合涂层,在MRH-3型高速环-块摩擦磨损试验机上评价了4种涂层在干滑动条件下的摩擦磨损性能.结果表明:通过端异氰酸酯基聚丁二烯液体橡胶改性环氧树脂可以提高环氧树脂涂层的力学性能及其抗磨性;填充5%和10%纳米A l2O3可以有效提高ETPB涂层的抗磨损性能;随着载荷和滑动速度的增加,ETPB涂层的磨损率明显增大;纳米A l2O3填充ETPB涂层的磨损率随载荷和滑动速度增加基本不变;4种涂层的摩擦系数随载荷和滑动速度的变化不大;E51环氧树脂基聚合物复合涂层的磨损机理为脆性断裂和剥层磨损.
Epoxy was modified with isocyanate-terminated polybutadine rubber （ITPB） in order to improve toughness of brittle polymer material, and nano-Al2O3 filled isocyanate-terminated polybutadine rubber/epoxy （ETPB） was made as to improve tribological properties of ETPB. Tribological properties of materials under dry sliding against AISI52100 steel ring at ambient conditions were investigated on an MRH-3 friction and wear tester in a ringon-block configuration. Wear rate of ETPB was 2 - 3 times lower as compared to that of epoxy and 2 - 5 times higher than that of ETPB filled with nano-Al2O3, and wear rate of ETPB containing 5% nano-Al2O3 was slightly lower than that of containing 10%. Wear rate of ETPB increased as load and sliding speed increased, but that of ETPB filled with nano-Al2O3 did not vary. Friction coefficient of all materials almost did not change with increasing load and sliding speed. Results indicate that wear resistance of epoxy and ETPB could be improved by modification with ITPB and filling with nano-Al2O3 particles, respectively. SEM analyses show that wear mechanism is brittle fracture and peeling-off.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2006年第4期314-319,共6页
Tribology
基金
国家自然科学基金重点项目资助(50432020)
