THE EXTRUSION MECHANICS OF PASTES - THE INFLUENCE OF PASTE FORMULATION ON EXTRUSION PARAMETERS
THE EXTRUSION MECHANICS OF PASTES - THE INFLUENCE OF PASTE FORMULATION ON EXTRUSION PARAMETERS
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DOI：
10.1016/0009-2509(87)85036-4
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发表时间：
1987-01-01
影响因子：
4.7
通讯作者：
BRIDGWATER, J
中科院分区：
文献类型：
--
作者：
BENBOW, JJ;OXLEY, EW;BRIDGWATER, J
用柱塞式挤压机研究了糊状物的流变学，在该挤压机中，存在收敛流，然后通过恒定直径的管（模口区）挤压。糊状物由已知尺寸分布的颗粒和已知流变学的液体制成。将收敛流视为屈服机制，将模槽内的活塞流视为壁面阻力，成功地描述了流动。这就产生了两个重要的挤压参数，即屈服值和壁面应力，所研究的七种不同的α-氧化铝浆料都符合这一规律。屈服值和壁面应力均与速度有关。在每种情况下，速度效应与液相的有效粘度成比例。颗粒尺寸分布和液相含量对挤出参数都有很大的影响。
Paste rheology has been studied with a ram extruder in which there is convergent flow followed by extrusion through a tube of constant diameter, the die-land. Pastes have been made from particles of known size distribution and liquids of known rheology. The flow has been described successfully by regarding the convergent flow to be governed by a yield mechanism and the plug flow in the die-land by wall resistance. This gives rise to two important extrusion parameters, namely the yield value and wall stress.The seven different α-alumina pastes which have been studied all comply with this pattern. Both the yield value and wall stress are dependent on velocity. In each instance, the velocity effect is proportional to the effective viscosity of the liquid phase. Particle size distribution and liquid phase content each have a substantial effect on the extrusion parameters.