【摘要】：噴墨打印成型技術(shù)作為3D打印技術(shù)之一,由于其打印精度高,人們?cè)噲D將其應(yīng)用于陶瓷材料的制備,特別是在精密陶瓷材料的制備中。陶瓷噴墨打印成型的關(guān)鍵是打印墨水的制備。對(duì)于氧化鋯陶瓷材料,由于其密度較高,難以穩(wěn)定地分散,且難以制備具有高固相含量低粘度的打印墨水。本文根據(jù)膠體化學(xué)的原理,試圖通過(guò)同時(shí)添加兩種不同類型分散劑聚丙烯酸銨(PAA-NH4)和聚乙烯吡咯烷酮(PVP),并改變?nèi)軇┲腥ルx子水、無(wú)水乙醇、丙三醇的比例的方法,提高氧化鋯粉末在打印墨水中的分散穩(wěn)定性,從而制備具有較高固相含量的3D打印陶瓷墨水。論文首先重點(diǎn)研究了二元分散劑對(duì)陶瓷墨水流變性能的影響,粘度結(jié)果表明:二元分散劑的添加模式對(duì)流變性的影響較大。與二元分散劑先后添加模式相比,同時(shí)添加模式的情況下陶瓷墨水的粘度更小。當(dāng)同時(shí)混合添加分散劑1wt%PAA-NH4和1wt%PVP,陶瓷墨水具有更低的粘度。SEM結(jié)果顯示陶瓷墨水分散良好。FTIR結(jié)果表明,二種分散劑相互作用產(chǎn)生的締合作用是提高陶瓷墨水流變性的主要原因。其次,通過(guò)沉降實(shí)驗(yàn)和干燥實(shí)驗(yàn),改變?nèi)軇┲兴�、甘油、酒精的比�?評(píng)估了陶瓷墨水的穩(wěn)定性與干燥性,結(jié)果表明:干燥速率隨著酒精含量的升高而增加;穩(wěn)定性隨著甘油含量的升高而增加。室溫下,對(duì)于固相含量為20vol%的陶瓷墨水,在噴墨打印的粘度要求范圍內(nèi),陶瓷墨水中酒精最大加入量為30vol%,甘油的加入量不超過(guò)35vol%。最后,利用墨滴觀測(cè)儀觀測(cè)噴墨打印過(guò)程,考察了打印溫度、脈沖電壓和工作頻率對(duì)墨滴噴射行為的影響,結(jié)果表明:自制20vol%陶瓷墨水在25℃和60℃下都能噴射形成單個(gè)規(guī)則圓潤(rùn)的墨滴,有較寬的噴墨溫度范圍;當(dāng)脈沖電壓120V、工作頻率為5000Hz時(shí),噴墨打印過(guò)程中墨滴噴射形態(tài)較為理想。使用該陶瓷墨水打印成型的義齒樣品經(jīng)燒結(jié)后,密度達(dá)到理論密度的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，

本文編號(hào)：2286177