(1. 北京科技大學(xué) 新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100083；
2. 北京科技大學(xué) 新材料技術(shù)研究院，北京 100083)
摘 要: 基于流體流動(dòng)模型和液相燒結(jié)作用力模型，對(duì)液相燒結(jié)第一階段中(液相生成與固相顆粒重排階段)液相Cu對(duì)固相W顆粒的潤(rùn)濕情況及顆粒的重排和密實(shí)化行為進(jìn)行模擬。本模型包含Navier-Stokes(N-S)方程、區(qū)分氣-液兩相流的VOF方程及顆粒所受作用力(毛細(xì)力和黏性力)方程。使用二維非定常分離隱式PISO算法求解N-S方程，描述流體流動(dòng)行為；求解VOF方程以區(qū)分氣-液兩相流；根據(jù)顆粒所受作用力編制顆粒運(yùn)動(dòng)自定義程序，控制顆粒運(yùn)動(dòng)，描述固相顆粒在毛細(xì)力牽引及黏性力共同作用下的運(yùn)動(dòng)。分析燒結(jié)過程液相對(duì)固相顆粒的潤(rùn)濕行為及液相燒結(jié)第一階段密實(shí)化規(guī)律。探討潤(rùn)濕角、顆粒間距對(duì)毛細(xì)力大小的影響，并結(jié)合具體燒結(jié)模型研究燒結(jié)體系顆粒尺寸對(duì)密實(shí)化速度的影響及不同初始液固比與燒結(jié)體系最終孔隙率的關(guān)系。最終將模擬結(jié)果與理論分析結(jié)果進(jìn)行對(duì)比，兩者基本一致。
關(guān)鍵字: Cu；W；液相燒結(jié)；數(shù)值模擬；毛細(xì)力；黏性力；Navier-Stokes方程；VOF方程
（1. State Key Laboratory for Advanced Metal and Materials, University of Science and Technology Beijing,
Beijing 100083, China;
2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract:The computational fluid dynamics model and interaction force model were applied to simulating the first wetting and rearrangement stage and densification behavior of W-Cu liquid phase sintering system. Navier-Stokes equation, volume of fluid (VOF) equation and interaction force (capillary force and viscosity force) equation were all involved in the model. The Navier-Stokes equations of fluid phases (including liquid and gas phases) were solved by pressure implicit with splitting of operators (PISO) and the VOF model was used to distinguish flowing behavior between liquid and gas phases. The interaction force between solid and liquid was described by a published theoretical model. The movement of solid particles was calculated by a user defined program based on the interaction forces. The wetting behavior of liquid phase to solid particle during sintering process and densification behavior were studied. The effects of wetting angle and particle distance on capillary forces were investigated. The influences of particle size on densification rate and the initial liquid-solid ratio on the final porosity were both discussed. Finally, simulation results were compared with the published theoretical results. The results show that they agree well with each other.
Key words: Cu; W; fluid phase sintering; numerical simulation; capillary force; viscosity force; Navier-Stokes equation; VOF equation
