超重力熔铸铁基金属陶瓷材料多相运动学特征及其致密化机制  

Multiphase Kinematics Characteristics and Densification Mechanism of Iron-based Metalloceramics Functionally Gradient Materials via Combustion Synthesis Infiltration Under a Ultra-gravity Field

作　　者：宋月鹏[1] 王征[1] 王伟[1] 高东升[1] 李法德[1] 宋占华[1] 杨增朝[2] 李江涛[2] Song Yuepeng;Wang Zheng;Wang Wei;Gao Dongsheng;Li Fade;Song Zanhua;Yang Zengchao;Li Jiangtao(Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments,Shandong Agricultural University,Tai’an 271018,China;Institute of Physical and Chemical Technology,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]山东农业大学山东省园艺机械与装备重点实验室,山东泰安271018 [2]中国科学院理化技术研究所,北京100190

出　　处：《稀有金属材料与工程》2020年第7期2352-2357,共6页Rare Metal Materials and Engineering

基　　金：国家十三五智能农机装备重点研发计划项目(2016YFD0701701);山东省自然科学基金(ZR2019MEE092);山东省现代农业产业技术体系果品产业创新团队资金(SDAIT-06-12,SDAIT-06-1)。

摘　　要：采用Fe3O4/Al/铁基硬质合金的铝热体系,超重力熔铸铁基金属陶瓷梯度材料,分析了超重力场中多相(硬质合金颗粒、Al2O3陶瓷相及气体相)在高热高温铁熔体内的运动学特征及其致密化机制。结果表明,根据Stocks定律,弥散相在高温熔体内的运动速度影响因素主要有颗粒与基体熔体密度差、超重力系数、颗粒半径及温度等,在一定的超重力系数下,材料的致密度与气泡尺寸、铁熔体存在时间有关。V-Fe和Cr-Fe2种颗粒主要集中于金属陶瓷材料的顶端,沿超重力方向粒子尺寸逐渐减小,而Mo-Fe颗粒主要集中在金属陶瓷材料与45钢分界面处,不同颗粒在材料内的分布状况有较大差异,这是金属陶瓷材料硬度呈梯度变化的主要原因。Iron-based metalloceramics functionally gradient material(FGM)was prepared by combustion synthesis casting under an ultra-gravity field through using thermite system with Fe3O4/Al/Fe-based cemented carbide.Multiphase kinematics characteristics and densification mechanism of cemented carbide particles in ultra-gravity field were explored.The results indicate that based on the Stocks rules,the effect on motion speed of particles in high-temperature melts is determined by density variation between the particles and melt,ultra-gravity coefficient,radius of particles,temperature and so on.Under a certain ultra-gravity coefficient condition,material density is related to bubble size and existing time of iron melt.On the top of the material,there are mainly two kinds of particles of ferrovanadium and ferrochrome,whose size will decrease along the direction of ultra-gravity field.However,ferromolybdenum mainly gathers in the interface between FGM and 45 steel.The most discrepancies of distribution characteristics for different particles are exhibited because of their difference of density and melting point.It leads to the gradient variation of hardness distribution for the FGM.

关 键 词：铁基金属陶瓷 超重力熔铸 运动学特征 致密化 Stocks规律 

分 类 号：TQ174.758[化学工程—陶瓷工业]