摘要
实验以热溶-速冻技术开发的PVA水凝胶为粘结剂,制备了具有一定流变特性、稳定的Al_(2)O_(3)陶瓷浆料,并采用自行设计的气动挤出直写3D打印机实现了形状复杂的Al_(2)O_(3)陶瓷件成形制备。研究了Al_(2)O_(3)陶瓷浆料的流变行为及可挤出打印条件,对打印坯体断面及烧结件进行了观察分析,并对网格坯体的干燥-烧结收缩率及烧结件的抗弯强度进行了测定。结果表明:采用PVA水凝胶作为粘结剂可制备出稳定的并能保证匀速挤出的Al_(2)O_(3)陶瓷浆料,适于直写3D打印的固相体积分数为55%~65%。提高固相体积分数,有助于浆料的3D打印成形,降低坯体的干燥-烧结收缩率,抑制烧结变形,但过高的固相体积分数会降低坯体层与层之间粘合程度,降低烧结件的抗弯强度。实验得出的最佳固相体积分数为60%,并通过工艺优化实现了多种形状陶瓷件的3D打印。
Using PVA hydrogel developed by hot dissolve quick freezing technology as binder,the stable Al_(2)O_(3) ceramic slurry with certain rheological properties was prepared,and the Al_(2)O_(3) ceramic parts with complex shape were formed by self-designed pneumatic extrusion direct writing 3D printer.The rheological behavior and extrudable printing conditions of Al_(2)O_(3) ceramic slurry were studied.The results show that using PVA hydrogel as binder can prepare stable Al_(2)O_(3) ceramic slurry that can be extruded at a uniform speed.The solid volume fraction suitable for direct writing 3D printing is 55%-65%.Increasing the solid volume fraction is conducive to 3D printing of slurry,reducing the drying sintering shrinkage of green body,and inhibiting sintering deformation.The bonding degree between green body layers and the flexural strength of sintered parts will be reduced with too high solid volume fraction.The optimal solid volume fraction obtained through experiments is 60%,and 3D printing of various shapes of ceramic parts has been achieved through process optimization.
作者
石永亮
刘浩
陈存广
SHI Yongliang;LIU Hao;CHEN Cunguang(Department of Materials Engineering,Hebei Vocation University of Industry and Technology,Shijiazhuang 050091,China;Advanced Material&Technology Institute,University of Science and Technology Beijing,Beijing 100083,China)
出处
《粉末冶金工业》
北大核心
2024年第5期83-88,共6页
Powder Metallurgy Industry
基金
河北省教育厅科学技术研究项目资助(QN2023003)
河北工业职业技术大学自然预研课题(zy202403)
