聚乙二醇400在氮化硅凝胶注模悬浮液中的应用(英文)

POLYETHYLENE GLYCOL 400 APPLIED IN AQUEOUS SILICON NITRIDE SUSPENSIONS IN GEL-CASTING

聚乙二醇 400(polyethylene glycol 400, PEG400)作为润湿剂用于制备高浓度氮化硅悬浮液,以简单的工艺,在降低料浆黏度的同时提高其固相含量。为表征润湿剂对高固相含量下氮化硅悬浮液的润湿特性,测试了其黏度及在润湿剂作用下的润湿性和吸附特性。结果表明:当悬浮液固相含量高达 60%(体积分数)时,在 PEG400 作用下其黏度可以显著降低。基于悬浮液中颗粒堆积形式,建立了等径密堆双球模型,阐释了 PEG400作用机理。

Polyethylene glycol 400 was used as wetting reagent for highly concentrated aqueous silicon nitride suspensions. The aim was to increase the solid loading of suspensions with low viscosity at normal processing conditions. Viscosity, hygrometric and absoot-ion measurements were carried out to research the wetting properties of the reagent in silicon nitride suspensions at high solid loading. The results show that the relative viscosity of the suspensions is decreased by using the wetting reagent PEG400, especially at solid loading of 60%（in volume）. A model was established for particles in solution as spheres with equal diameter and sufficient packing to explain the function of PEG400.