分散剂对低温共烧陶瓷流延浆料流变性能的影响

本文探究了蓖麻油、BYK-22552、聚乙烯吡咯烷酮(PVP)、TEGO-700四种分散剂对CaO-B₂O₃-La₂O₃玻璃/氧化铝低温共烧陶瓷(LTCC)流延浆料分散性的影响,并进一步对该体系浆料流变性能、触变性能、固相体积分数以及沉降性能方面进行了研究,通过红外光谱分析研究了四种分散剂的分散机理并给出了解释。结果表明,当分散剂TEGO-700用量为粉体质量的2%时,流延浆料具有最小黏度(1 650 mPa·s)与最佳触变恢复性。在流延成型最佳黏度2 000 mPa·s下,浆料具有最大固相体积分数(37.2%)与优异的沉降性能。该浆料流延成型得到的柔性生瓷带表面平整且厚度均一,表面粗糙度为144 nm。烧结得到的基板材料表面无气孔、裂纹等明显缺陷,烧结致密化程度高,表面粗糙度为210 nm,40 GHz下测得介电常数与介电损耗分别为6.257和1.431×10^-3。

Effects of Dispersants on Rheological Properties of LTCC Casting Slurry

In this paper, the effects of castor oil, BYK-22552, polyvinylpyrrolidone (PVP) and TEGO-700 on the dispersion of CaO-B₂O₃-La₂O₃ glass/alumina casting slurry of low temperature co-fired ceramic (LTCC) were investigated. The rheological properties, thixotropy, solid content and sedimentation properties of the casting slurry were further studied. The dispersion mechanism of four dispersants was researched and explained by infrared spectroscopy. The results show that when the amount of dispersant TEGO-700 is 2% of the powder mass, the casting slurry has the minimum viscosity (1 650 mPa·s) and the best thixotropic recovery. Under the optimum viscosity of 2 000 mPa·s for tape casting, the slurry has the maximum solid content (37.2%) and excellent sedimentation performance. The surface of the green tapes is flat and uniform in thickness, and the surface roughness is 144 nm. The surface of the sintered substrate has no obvious defects such as pores and cracks. The sintering densification is improved and the surface roughness is 210 nm. The dielectric constant and dielectric loss of sintered substrate measured at 40 GHz are 6.257 and 1.431×10^-3, respectively.