3D打印氧化锆陶瓷墨水的制备与性能研究
发布时间：2018-10-21 19:46
【摘要】：喷墨打印成型技术作为3D打印技术之一,由于其打印精度高,人们试图将其应用于陶瓷材料的制备,特别是在精密陶瓷材料的制备中。陶瓷喷墨打印成型的关键是打印墨水的制备。对于氧化锆陶瓷材料,由于其密度较高,难以稳定地分散,且难以制备具有高固相含量低粘度的打印墨水。本文根据胶体化学的原理,试图通过同时添加两种不同类型分散剂聚丙烯酸铵(PAA-NH4)和聚乙烯吡咯烷酮(PVP),并改变溶剂中去离子水、无水乙醇、丙三醇的比例的方法,提高氧化锆粉末在打印墨水中的分散稳定性,从而制备具有较高固相含量的3D打印陶瓷墨水。论文首先重点研究了二元分散剂对陶瓷墨水流变性能的影响,粘度结果表明:二元分散剂的添加模式对流变性的影响较大。与二元分散剂先后添加模式相比,同时添加模式的情况下陶瓷墨水的粘度更小。当同时混合添加分散剂1wt%PAA-NH4和1wt%PVP,陶瓷墨水具有更低的粘度。SEM结果显示陶瓷墨水分散良好。FTIR结果表明,二种分散剂相互作用产生的缔合作用是提高陶瓷墨水流变性的主要原因。其次,通过沉降实验和干燥实验,改变溶剂中水、甘油、酒精的比例,评估了陶瓷墨水的稳定性与干燥性,结果表明:干燥速率随着酒精含量的升高而增加;稳定性随着甘油含量的升高而增加。室温下,对于固相含量为20vol%的陶瓷墨水,在喷墨打印的粘度要求范围内,陶瓷墨水中酒精最大加入量为30vol%,甘油的加入量不超过35vol%。最后,利用墨滴观测仪观测喷墨打印过程,考察了打印温度、脉冲电压和工作频率对墨滴喷射行为的影响,结果表明:自制20vol%陶瓷墨水在25℃和60℃下都能喷射形成单个规则圆润的墨滴,有较宽的喷墨温度范围;当脉冲电压120V、工作频率为5000Hz时,喷墨打印过程中墨滴喷射形态较为理想。使用该陶瓷墨水打印成型的义齿样品经烧结后,密度达到理论密度的95%以上。
[Abstract]:As one of 3D printing technology, inkjet printing technology has high printing accuracy, so people try to apply it to the preparation of ceramic materials, especially in the preparation of precision ceramic materials. The key of ceramic inkjet printing is the preparation of printing ink. For zirconia ceramic materials, it is difficult to disperse stably because of its high density, and it is difficult to prepare printing ink with high solid content and low viscosity. According to the principle of colloidal chemistry, this paper attempts to change the ratio of deionized water, anhydrous ethanol and glycerol by adding two different dispersants, PAA-NH4 and (PVP), simultaneously. The dispersion stability of zirconia powder in printing ink was improved, so that 3D printing ceramic ink with high solid content was prepared. The effect of binary dispersant on the rheological properties of ceramic ink was studied. The viscosity results showed that the effect of binary dispersant on the rheological properties of ceramic ink was significant. Compared with binary dispersant, the viscosity of ceramic ink is lower when the mode is added at the same time. When the dispersant 1wt%PAA-NH4 and PVP were mixed at the same time, the ceramic ink had lower viscosity. The SEM results showed that the ceramic ink was well dispersed. The FTIR results showed that the association between the two dispersants was the main reason for improving the rheological properties of the ceramic ink. Secondly, the stability and dryness of ceramic ink were evaluated by changing the ratio of water, glycerol and alcohol in the solvent by sedimentation and drying experiments. The results showed that the drying rate increased with the increase of alcohol content. The stability increases with the increase of glycerol content. At room temperature, the maximum amount of alcohol in ceramic ink is 30 vols and the amount of glycerol is not more than 35 vols in the viscosity range of ink jet printing for ceramic ink with solid content of 20 vol.%. Finally, the effects of printing temperature, pulse voltage and working frequency on the spray behavior of ink jet were investigated by using a droplet observation instrument. The results show that the self-made 20volr% ceramic ink can be sprayed into a single regular circular ink droplet at 25 鈩，
本文编号：2286177
[Abstract]:As one of 3D printing technology, inkjet printing technology has high printing accuracy, so people try to apply it to the preparation of ceramic materials, especially in the preparation of precision ceramic materials. The key of ceramic inkjet printing is the preparation of printing ink. For zirconia ceramic materials, it is difficult to disperse stably because of its high density, and it is difficult to prepare printing ink with high solid content and low viscosity. According to the principle of colloidal chemistry, this paper attempts to change the ratio of deionized water, anhydrous ethanol and glycerol by adding two different dispersants, PAA-NH4 and (PVP), simultaneously. The dispersion stability of zirconia powder in printing ink was improved, so that 3D printing ceramic ink with high solid content was prepared. The effect of binary dispersant on the rheological properties of ceramic ink was studied. The viscosity results showed that the effect of binary dispersant on the rheological properties of ceramic ink was significant. Compared with binary dispersant, the viscosity of ceramic ink is lower when the mode is added at the same time. When the dispersant 1wt%PAA-NH4 and PVP were mixed at the same time, the ceramic ink had lower viscosity. The SEM results showed that the ceramic ink was well dispersed. The FTIR results showed that the association between the two dispersants was the main reason for improving the rheological properties of the ceramic ink. Secondly, the stability and dryness of ceramic ink were evaluated by changing the ratio of water, glycerol and alcohol in the solvent by sedimentation and drying experiments. The results showed that the drying rate increased with the increase of alcohol content. The stability increases with the increase of glycerol content. At room temperature, the maximum amount of alcohol in ceramic ink is 30 vols and the amount of glycerol is not more than 35 vols in the viscosity range of ink jet printing for ceramic ink with solid content of 20 vol.%. Finally, the effects of printing temperature, pulse voltage and working frequency on the spray behavior of ink jet were investigated by using a droplet observation instrument. The results show that the self-made 20volr% ceramic ink can be sprayed into a single regular circular ink droplet at 25 鈩，
本文编号：2286177
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