【摘要】 将旋转叶片应用于应力控制流变仪,测量陶瓷浆料固化过程中的流变特性.在数据处理上,可将添满陶瓷浆料的旋转叶片等效为一个同心圆筒,并按照同心圆筒进行测试参数的设置.我们采用四叶片的旋转叶片测试不同浓度的聚丙烯酰胺溶液的复数模量G*,并与平行板测试数据比较.结果表明旋转叶片存在有效直径.这个有效直径小于叶片直径.确定了在测试陶瓷浆料固化过程流变特性时的有效直径Deff.并得到陶瓷浆料固化过程的流变曲线.更多还原

【Abstract】 A four-blade geometry test fixture was used to capture the evolution moduli of alumina suspensions in gelcasting process in oscillatory measurement. The vane geometry was treated as a couette while the test material moving with the blade formed cylinder-like shearing surface. The diameter of the cylinder was defined as effective diameter of vane and calibrated by comparing the complex modulus G* with data from parallel plate in measuring polyacrylamide solution. Test results show that the effective diameter of the shearing cylinder is smaller than the diameter of the blades . This method provides an convenient way to measure the sol-gel transition in gelcasting process.更多还原