摘要
详细讨论了粉末与粘结剂混炼后形成的喂料在圆形口模内的挤出过程，可以将其分为入口区的收敛流动，全展流区的轴向层流，出口区的匀速运动与膨胀行为。探讨了不同流变区域的流动机理和特点，分析了喂料熔体在圆型口模区域内流变过程中表现出的一系列流变学特性，重点研究了直接影响挤出物品质的全展流区内熔体的流动行为。通过对全展流区内的流变行为与特点的分析与概括，建立了简化实用的物理模型，并在此基础上通过严密的数学推导，得出了一系列流变学参量数学表达式。
The extrusion of mixed feedstocks(binder plus powder) are discussed in detail. The extrusion flow generally can be divided into: convergent flow, axial layer-flow and uniform flow, and the swell behaviour. The flow mechanism and the features of the various rheologic regions are examined. Some rheologic characteristics of the melting feedstocks in the flow processes are analysed and the melting-matter flow behaviors in the full-developing region which directly effects the extruded product qualities are studied stressly.As a result of the analyses of the flow behaviours and features of the full-developing region, a simple practical physical model is offered, and some mathematical functions describing rheologic behavior are presented.Correspondent: Zhou Jicheng, Associate Professor, National Key Laboratory for Powder Metallurgy, Central South University ofTechnology, Changsha 410083, P. R. China, Tel=086-731-8826911-3724
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1998年第5期267-270,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金!59634120
