基于DIW工艺的ZrO_(2)/PDMS复合陶瓷材料可打印性能研究

Research on Printability of ZrO_(2)/PDMS Composite Ceramics Material by DIW Process

针对ZrO_(2)材料应用于手机背板以及其他3C电子产品的需求,以氧化锆作为分散相,PDMS作为连续相,将墨水直写工艺与该复合陶瓷材料的成型制备方法相结合,研究ZrO_(2)/PDMS复合陶瓷材料的可打印性能。在试验研究中,对不同分散相含量的浆料进行流变测试,测试结果表明配制的浆料具有非牛顿流体特性,当ZrO_(2)体积分数在25%~30%时,浆料用于墨水直写打印时较易挤出且成型较好,此时浆料的储能模量在10^5~10^6Pa,临界屈服应力在142~264 Pa。在此基础上,研究了不同配比、针头直径与挤出速度对挤出纤维形貌的影响,结果表明纤维膨胀比与变形比随着分散相含量的增加而减少,随着针头直径与挤出速度的增加而增加;在低分散相含量时更容易达到材料的临界屈服应力,纤维膨胀比和变形比大,纤维表面缺陷少,高分散相含量时材料强度提高,纤维膨胀比和变形比低,但较难挤出,且容易出现熔体破裂现象。当ZrO_(2)体积分数为28%,针头直径为1 mm,挤出速度为6 mm/s时纤维成型质量最优,表明ZrO_(2)/PDMS复合陶瓷材料可用于墨水直写工艺,从而为后续陶瓷构件的制造奠定基础。

Aiming at the demand of flexible composite ceramic material ZrO_(2)/PDMS applied to mobile phone backplanes and other 3C electronic products.ZrO_(2)was used as the dispersed phase and PDMS was used as the continuous phase.The direct ink writing process was combined with the molding preparation method of the flexible composite ceramic material to study the printability of ZrO_(2)/PDMS composite ceramic material.In the experimental study,rheological tests were conducted on slurries with different dispersed phase contents,and the results showed that the prepared slurries had non-Newtonian fluid characteristics.The slurry was more easily extruded and better formed when the ZrO_(2)volume fraction was between 25%and 30%.At this point,the storage modulus of the slurry was between 105—106 Pa,and the critical yield stress was between 142—264 Pa.Then,the effects of different content of dispersed phase,nozzle diameter and extrusion speeds on the morphology of extruded fiber were studied.The results showed that the fiber expansion ratio and deformation ratio decreased with the increase of dispersed phase content,and increased with the increase of needle diameter and extrusion speed.It was easier to achieve the critical yield stress of the material at low dispersed phase content,with higher fiber expansion ratio and deformation ratio,fewer surface defects,and stronger material strength at higher dispersed phase content,but with more difficulty in extrusion and a tendency for melting breaks.When the volume fraction of ZrO_(2)was 28%,the needle diameter was 1 mm,and the extrusion speed was 6 mm/s,the fiber forming quality was optimal,indicating that the ZrO_(2)/PDMS composite ceramic material can be used in the ink direct writing process,laying the foundation for the manufacture of ceramic components in the future.