直接喷墨打印喷头直径对铁磁软磁材料成形性能的影响

Effect of Nozzle Diameter on Properties of Ferromagnetic Soft Magnetic Material by Direct Inkjet Printing Process

以羰基铁粉为原料,DISPER-Y220为分散剂,制备出粘度为0.55 Pa·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出纯铁软磁材料制件。喷头直径分别0.5、0.8和1.0 mm,打印成形后通过脱脂和烧结制备出制件。结果表明:分散剂添加量为1%时(质量分数),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0.8 mm所打印的烧结体,表面粗糙度(R_a)最低,其R_a为0.8μm;在1300℃保温2 h烧结后,喷头直径为0.5 mm打印的烧结体致密度最高,为96.3%,其磁饱和感应强度Bs达到1.53 T,最大磁导率μmax达到2630。

Slurry with viscosity 0.55 Pa·s and good flowability was prepared using carbonyl iron powder and DISPER-Y220 as raw material and dispersant, respectively. Then with the slurry as a printing ink, ferromagnetic soft magnetic workpieces were prepared by direct inkjet printing process with the nozzle size of 0.5, 0.8 and 1.0 mm. Subsequently the printed samples were degreased and sintered. The results show that the viscosity of the slurry is the lowest when the dosage of dispersant is 1 wt% and the viscosity of the slurry increases with the solids content; with shear rate increasing, the slurry is shear thinning over shear rate. The sintered body printed with the nozzle of 0.8 mm in size has the lowest surface roughness of 0.8 μm. After sintering at 1300 ℃ for 2 h, the sintered body printed with the nozzle of 0.5 mm in size has a relative density of 96.3%, a saturation magnetization（BS） of 1.53 T and the maximum magnetic permeability（μmax） of 2630.