基于同步辐射原位实验的微观形貌演化参量提取与微波烧结磁场作用机制研究  

Micro-morphology evolution parameter extraction and investigation of the magnetic field effect in microwave sintering based on in-situ SR-CT experiments

作　　者：王远香 肖宇[1] 李永存 王袁杰 胡小方[1] 许峰[1] WANG Yuanxiang;XIAO Yu;LI Yongcun;WANG Yuanjie;HU Xiaofang;XU Feng(CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230027,Anhui,China;National Demonstration Center for Experimental Mechanics Education,College of Mechanical and Vehicle Engineering,TaiyuanUniversityofTechnology,Taiyuan 030024,Shanxi,China)

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计重点实验室,安徽合肥230027 [2]太原理工大学机械与运载工程学院力学国家级实验教学示范中心,山西太原030024

出　　处：《实验力学》2025年第1期21-29,共9页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(12002337,12027901)。

摘　　要：作为一种先进冶金方法,微波烧结能够快速制备性能优异的材料。通过形貌特征演化揭示微波烧结机制,是优化微波烧结材料性能的关键。本文采用同步辐射计算机断层扫描(Synchrotron Radiation Computed Tomography,简称SR-CT)开展了金属以及金属-非金属混合体系微波烧结过程结构演化的原位实验观测,并采用基于傅里叶描述符的方法对颗粒表面粗糙度演化进行了定量表征。基于定量表征结果,发现铜-石墨体系中颗粒表面更为光滑,同时颗粒分布较为密集的区域,颗粒表面光滑化的进度更为迅速。结合数值模拟,提出了物质与微波磁场相互作用影响磁场强度分布,进而影响颗粒表面涡流损耗,最终导致颗粒表面粗糙度发生不同演化过程的微波烧结磁场作用机制。Microwave sintering is an advanced metallurgical technique that enables the rapid preparation of high-performance materials.Understanding the underlying mechanisms of microwave sintering through the examination of morphological evolution is crucial for optimizing the properties of sintered materials.In this study,Synchrotron Radiation Computed Tomography(SR-CT)was utilized to conduct in-situ experimental observations of the structural changes occurring during microwave sintering of metal and metal-nonmetal mixed systems.The Fourier descriptors-based method was employed to quantitatively characterize the progression of particle surface roughness.The quantitative results indicated that in the copper-graphite mixed system,the particle surface exhibited a smoother texture,and regions with a higher particle density demonstrated a more rapid improvement in surface smoothness.Through numerical simulations,it was proposed that the interaction between the material and the microwave magnetic field influenced the distribution of magnetic field intensity,thereby affecting the eddy current losses on the particle surface.Ultimately,these factors resulted in distinct evolution processes of particle surface roughness during microwave sintering.

关 键 词：微波烧结 微观结构 同步辐射CT 电磁场 表面粗糙度 

分 类 号：TF124[冶金工程—粉末冶金]