石墨烯纳米片增强ODS钢复合材料的制备及其拉伸性能  

Preparation and tensile properties of graphene nanoplatelets reinforced ODS steel composites

作　　者：曹书光 王辉 周张健[1] CAO Shuguang;WANG Hui;ZHOU Zhangjian(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610041,China;School of Mechanical Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国核动力研究院燃料与材料科学技术实验室,四川成都610041 [3]成都大学机械工程学院,四川成都610106

出　　处：《中南大学学报（自然科学版）》2022年第8期2878-2885,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51971207);国家磁约束聚变能研究项目(2018YFE0306100)。

摘　　要：为了提高ODS FeCrAl合金的机械性能和导热性能,采用机械合金化法将石墨烯纳米片(GNPs)和ODS FeCrAl粉末进行混合,并利用放电等离子烧结(SPS)技术制备GNPs/ODS FeCrAl复合材料。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)、电子万能试验机和热盘法(hot-disk法)等分析混合粉末混合前后的形貌,研究石墨烯添加对烧结态复合材料微观结构、拉伸性能和导热性能的影响。研究结果表明:在混合粉体中未检测到碳化物,而烧结态复合材料中发现了少量CrC和CrC,这表明在固结过程中部分石墨烯与基体中Cr元素发生了反应。经过高能球磨后,部分石墨烯纳米片被镶嵌在ODS钢粉末中,而其他石墨烯纳米片则保持其固有结构。烧结态GNPs/ODS钢复合材料的抗拉强度和导热系数分别达到了1 078 MPa和10.88 W/(m·K),相比未添加石墨烯的ODS钢,分别提高了18%和22%。In order to improve the mechanical properties and thermal conductivity of ODS FeCrAl alloy,graphene nanoplatelets(GNPs) and ODS FeCrAl powders were mixed by mechanical alloying method, and then GNPs/ODS FeCrAl composites were consolidated by Spark Plasma Sintering(SPS). Scanning electron microscopy(SEM),X-ray diffraction(XRD), transmission electron microscopy(TEM), electronic universal testing machine and hot disk method were used to analyze the morphology of the mixed powder before and after mixing. The effects of graphene addition on the microstructure, tensile properties and thermal properties of the bulk composites were investigated. The results show that there is no carbide in the mixed powder, while a small amount of CrCand CrCare found in the sintered bulk composites, indicating that some of the graphene reacts with Cr element in the matrix during the consolidation process. Some GNPs are embedded in the ODS FeCrAl powder after high-energy ball milling, while some graphene retains its inherent structure. The tensile strength and thermal conductivity of the bulk GNPs/ODS FeCrAl composite are increased by 18% and 22%, respectively, compared with that of ODS FeCrAl without GNPs.

关 键 词：GNPs ODS钢基复合材料 机械合金化 拉伸性能 导热性能 

分 类 号：TL341[核科学技术—核技术及应用] TB331[一般工业技术—材料科学与工程]