化工进展2023，Vol.42Issue(12)：6197-6206,10.DOI:10.16085/j.issn.1000-6613.2023-0148
In-Bi-Sn基Si3N4/GNFs混合纳米流体的流变性和润滑性
Rheological properties and lubricity of In-Bi-Sn based Si3N4/GNFs hybrid nanofluid
摘要
Abstract
Existing hydraulic transmission media of water,oil and other anhydrously synthesized materials have problems such as poor stability at high temperature and large temperature-dependent viscosity change.In contrast,In-Bi-Sn alloy has low melting point,good fluidity,and stable high-temperature properties,making it an ideal base fluid for hydraulic transmission media at extreme high temperature.In this work,In-Bi-Sn-based Si3N4/GNFs hybrid nano-fluids with volume fractions of 0,5%,10%,20%and 30%were prepared by a two-step method.The morphology,dispersion,and thermal stability of the samples were characterized by TEM,SEM+EDS and TGA.The rheological properties and lubricity of the samples were studied by high-temperature rotary rheometer and friction wear testing machine.The differences in thermal stability,rheology,and lubricity between samples and existing high-temperature hydraulic media were compared.The results showed that Si3N4 was embedded in GNFs plates and dispersed in In-Bi-Sn matrix in the form of aggregates,and the aggregate size of 10%sample was smaller than that of 20%sample.The viscosity of the samples increased with the increase of the volume fraction of the hybrid nanoparticles,and the effects of the static time of the liquid and the number of phase transformation on the viscosity of the sample<30%were not obvious.Under the influence of Brownian motion of nanoparticles,the higher the volume fraction of nanoparticles was,the more significant its temperature-dependent viscosity change was.The 20%sample showed obvious thinning characteristics,due to the change of particle size.Adding Si3N4/GNFs hybrid nanoparticles could significantly improve the lubrication characteristics.Compared with the existing high-temperature hydraulic medium,the In-Bi-Sn-based Si3N4/GNFs hybrid nanofluid had excellent thermal stability,less temperature dependence in viscosity and good high-temperature lubrication.关键词
液态金属/纳米粒子/纳米流体/流变性/润滑性/热稳定性Key words
liquid metal/nanoparticles/nanofluid/rheological properties/lubricity/thermal stability分类
通用工业技术引用本文复制引用
蒋佳骏,吴张永,朱启晨,蔡昌礼,朱家军,王志强..In-Bi-Sn基Si3N4/GNFs混合纳米流体的流变性和润滑性[J].化工进展,2023,42(12):6197-6206,10.基金项目
国家自然科学基金(51165012) （51165012）
四川省区域创新合作项目(2022YFQ0084) （2022YFQ0084）
昆明理工大学分析测试基金(2021P20203103003). （2021P20203103003）
