蓝钨纳米颗粒的化学改性及其纳米流体热冲击稳定性实验研究  

Chemical Modification of Blue Tungsten Nanoparticles and Thermal Shock Stability of Nanofluids

作　　者：王洒 杨谋存[1] 朱跃钊[1] WANG Sa;YANG Moucun;ZHU Yuezhao(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《硅酸盐通报》2020年第2期631-638,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2018YFB1502900);国家自然科学基金(51105192);江苏省自然科学基金(BK2010556);江苏省六大人才高峰项目(XNY-028)。

摘　　要：选择四种改性剂对蓝钨纳米颗粒表面进行改性,利用扫描电镜(SEM)、红外光谱(FTIR)、沉降实验分析得出偶联剂KH550改性得到颗粒羟基数最少,亲油能力最强,分散在导热油中的稳定性最好;阐述纳米颗粒硬团聚形成机理及偶联剂KH550化学改性蓝钨颗粒的反应原理;设计三组单因素变量影响热冲击稳定性的对比实验来进行改性工艺优化,利用分光光度计(UV-VIS-NIR)进行稳定性分析,得到最佳偶联剂用量为0.75 mL、最佳超声时间为1 h、最佳改性温度为70℃。经最佳改性工艺处理得到的蓝钨颗粒分散在导热油,在中低温热冲击环境中至少保持20 d稳定状态。Four modifiers were selected to modify the surface of blue tungsten nanoparticles. Scanning electron microscope(SEM), infrared spectroscopy(FTIR) and sedimentation experiments were used to analyze the results. The mechanism of hard agglomeration formation of nanoparticles and the reaction principle of blue tungsten particles modified by coupling agent KH550 were described. Three groups of comparative experiments with single factor variables affecting thermal shock stability were designed to optimize the modification process. Spectrophotometer(UV-VIS-NIR) was used for stability analysis, and the optimal dosage of coupling agent is 0.75 mL, the optimal ultrasonic time is 1 h, and the optimal modification temperature is 70 ℃. The blue tungsten particles obtained by the optimal modification process are dispersed in the heat transfer oil and keep stable for at least 20 d in the medium and low temperature thermal shock environment.

关 键 词：蓝钨纳米颗粒 改性 热冲击稳定性 工艺优化 

分 类 号：TB383[一般工业技术—材料科学与工程]