摘要
设计并合成了油溶性环烷酸锌和异氰酸酯类超分散稳定剂,采用原位构筑方法获得了非水纳米ZnS分散系,用冷冻蚀刻电镜对其进行了表征,用离心实验对其分散稳定性进行了考察.对纳米粒子的形成过程、分散稳定机理进行了阐述.用环块和四球摩擦试验机对纳米ZnS分散系的摩擦学性能进行了研究.结果表明:ZnS为40 nm的粒状颗粒,大小均匀,在介质中呈单粒子分散;纳米分散系经72 h普通离心和56 h非连续超离心均未发生沉降,表现出理想的分散稳定性;试验显示超分散稳定纳米ZnS的存在,能明显改善油样的抗磨减摩性能和承载能力.在试验范围内,添加的纳米ZnS的量越大,其抗磨减摩性能也越好,但当n-ZnS的质量分数大于0.25%时,其承载能力趋于稳定.
The oil-soluble zinc naphthenate and isoeyanate hyper-dispersion stabilizer were successfully synthesized. The ZnS nanoparticles（n-ZnS） were synthesized in-situ in liquid paraffin containing zinc naphthenate and hyper-dispersion stabilizer. The size, size distribution and conglomeration behavior of n-ZnS in dispersion were observed by the freeze-etching replication transmission electron microscopy technique. Formation and dispersion stability mechanism of n-ZnS were investigated. The tests of normal and high speed centrifuge were used for evaluating the dispersion stability of n-ZnS. Tribological characteristics of the lubricants in the presence and absence of n-ZnS were investigated by the block-on-ring and four-ball tribo-test. The results show that the n-ZnS are grain shape with 40 nm size and single-particle-dispersion properties, which didn＇t come into being sedimentation through 72 h centrifuge tests and 56 h intermittent high speed centrifuge tests. The n-ZnS Nano-dispersion exhibited antiwear property as well as extreme pressure property. The tribological characteristics of oil samples take a turn for better with n-ZnS content adding in the range of experiment. And the extreme pressure properties are heading for stability when n-ZnS contents of oil samples are weight percent of 0.25%.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2009年第3期367-372,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50572121)
武器装备重点预研基金项目(9140A27010206JB35)
重庆市自然科学基金项目(CSTC2006BB4130
CSTC2006CE9032)
后勤工程学院学术创新基金项目(YZ07-42201)
关键词
纳米ZNS
超分散稳定
非水原位合成
摩擦学性能
ZnS nanoparticles
ultra-dispersity-stability
nonaqueous in-situ synthesis
tribological characteristics
