放电等离子烧结制备Ba^(2+)掺杂γ-La_2S_3陶瓷及其性能研究

Study on Preparation and Properties of Ba^(2+) Doped Lanthanum Sesquisulfide Ceramics Sintered by Spark Plasma Sintering

以气固反应硫化制备的γ-La2S3粉体为原料,采用放电等离子烧结(SPS)技术制备出γ-La2S3多晶陶瓷。研究了Ba2+掺杂量对得到γ-La2S3粉体物相结构的影响,并分析了烧结温度、再硫化工艺参数对γ-La2S3多晶陶瓷微观组织结构和红外透过率的影响。结果表明:掺入Ba2+有利于低温获得稳定的高温型γ-La2S3相,在nLa/nBa为5～15时能够得到纯相的γ-La2S3粉体。在烧结温度为1150℃,保温时间为5 min时制备出的γ-La2S3陶瓷致密,无明显气孔,在CS2气氛下再硫化2.5 h后,在10～14μm波段的红外峰值透过率达到42%。

γ-La2S3 polycrystalline ceramics were prepared by spark plasma sintering using γ-La2S3powder as raw material synthesized by the gas-solid reaction. The effect of doping content of Baz ＋ on the phase composition of γ-La2S3 powder was sttldied. The influences of sintering temperature and resulfurization on the microstructures and infrared transmittance of γ-La2S3polycrystalline were analyzed. The result indicated that γ-La2S3 phase could be stabilized well by doping Ba2＋ and pure γ-La2S3 phase could be obtained when nLa/nBa c exhibites high densities after resulfurized in the hanged from 5 to 15. The polycrystalline ceramic sintered at 1150 °C for 5 min and uniform grain size, the maximum transmittance reached 42% in 10-14 μm CS2 atmosphere for 2.5 h.