直接喷墨打印成形铁磁软磁材料的工艺研究

Preparation of Ferromagnetic Soft Magnetic Material by Direct Inkjet Printing Process

摘要:

本文以羰基铁粉为原料,用DISPER-Y220为分散剂,制备出粘度为0.55Pa.s,流动性良好的料浆,以此料浆作为打印“墨水”,利用直接喷墨打印成形技术制备纯铁软磁材料制件。喷头直径分别以0.5mm、0.8mm和1.0mm打印零件,打印成形后通过脱脂和烧结制备出制件。结果表明：分散添加量为1wt%时,料浆粘度最低,随着固含量的增大,料浆粘度变大,随着剪切速率的增大,料浆表现为剪切变稀特征；喷头直径为0.8mm所打印的烧结体,表面粗糙度最低,其Ra为0.8μm；在1300℃保温2h烧结后,喷头直径为0.5mm的烧结体致密度最高,为96.3%,其磁饱和感应强度B_s达到1.53T,最大磁导率μ_max达到2630。

关键词:料浆;直接喷墨打印技术;羰基铁粉;软磁材料;致密度

Abstract:

In this paper, carbonyl iron powder and DISPER-Y220 are used as raw material and dispersant, respectively. The viscosity of slurry is detected as 0.55 Pa ? s and the slurry has good flowability slurry to be a printing ink. The ferromagnetic soft magnetic workpieces are prepared by direct inkjet printing process with the nozzle size of 0.5mm, 0.8mm and 1.0mm respectively, and then the samples printed have been through degreasing and sintering. The results showed that the viscosity of the slurry is lowest when the dosage of dispersant is1wt% and the viscosity of the slurry is increased with the solids content and shear rate increased .The slurry is shear thinning over the shear rate .The sintered body printed with the nozzle size of 0.8mm has a lowest surface roughness of 0.8μm. After sintered at 1300 ℃ for 2h ,the sintered body printed with the nozzle size of 0.5mm has a relative density of 96.3%, the saturation magnetization (B_S ) and the maximum magnetic permeability (μ_max ) reaching to 1.53T and 2630, respectively.

Key words:slurry; direct inkjet printing process; carbonyl iron powder; soft magnetic material; relative density