【摘要】 采用放电等离子烧结(sparkplasmasintering,SPS)技术,以CaF2为烧结助剂,在1850℃烧结15min,成功制备了透明AlN陶瓷。随着CaF2含量的增加,样品的密实度和透过率都随之提高。在CaF2含量为2.5%(质量分数)的AlN陶瓷样品的透光率最高(56.3%)。继续提高CaF2含量,样品密实度和透过率反而有所下降。SPS制备的纯AlN陶瓷样品中出现了颜色不均匀现象。与传统烧结方法比较,SPS制备的样品具有很高的致密度、纯度和良好的晶体结构。CaF2的加入降低了烧结温度,烧结时间短,提高了AlN陶瓷的透过率,是制备透明AlN陶瓷的有效烧结助剂。更多还原

【Abstract】 Transparent CaF₂ doped AlN ceramics were prepared by spark plasma sintering （SPS） at 1 850 ℃ for （15 min）. With the increase of the amount of CaF₂, the density and transmittance of the samples increase. The sample doped with 2.5% in mass CaF₂ has the best transmittance of 56.3%. When CaF₂ content was increased to over 2.5%, the density and transmittance decrease with the increase of the addition of CaF₂. Heterogeneity in the color was observed in the pure AlN ceramics prepared by SPS. Compared with traditional densification methods, the samples prepared by SPS have high density, high purity and fine microstructures. The addition of CaF₂ can not only lower the sintering temperature but also can improve the transparency, which indicates that CaF₂ is an effective additive for the preparation of transparent AlN ceramics.更多还原