摘要
为了提高Si_(3)N_(4)陶瓷的烧结致密度,采用振荡压力烧结工艺分别在1745和1775℃制备了Si_(3)N_(4)陶瓷,主要研究了Si_(3)N_(4)粉的粒度(平均粒径分别为0.4、2.0、2.3μm)对Si_(3)N_(4)陶瓷的显微结构和性能的影响。结果显示:1)在两种温度的振荡压力烧结工艺下,由三种不同粒度的Si_(3)N_(4)粉制备的Si_(3)N_(4)陶瓷的相对密度都很大,为99.65%~99.86%,彼此相差很小。2)由平均粒径为0.2μm的Si_(3)N_(4)粉在1745℃烧结制备的试样的微观结构最均匀,其β-Si_(3)N_(4)晶粒平均长径比、抗弯强度和维氏硬度均最大,分别达到5.0、(1364±65)MPa和(15.72±0.8)GPa;由平均粒径为2.3μm的Si_(3)N_(4)粉在1745℃烧结制备的试样的β-Si_(3)N_(4)晶粒的平均长径比、抗弯强度和维氏硬度均最小,分别为3.3、(846±49)MPa和(13.82±0.8)GPa。
In order to obtain high sintered density,Si_(3)N_(4) ceramics were prepared by oscillatory pressure sintering at 1745 and 1775℃,respectively.The effects of the Si_(3)N_(4) powder particle size(average particle size of 0.4,2.0,and 2.3μm)on the microstructure and the properties of Si_(3)N_(4) ceramics were studied.The results show:(1)the relative density of the Si_(3)N_(4) ceramics prepared by the Si_(3)N_(4) powders with three different particle sizes sintered at both temperatures is large,which is 99.65%-99.86%,varying slightly;(2)the sample sintered at 1745℃with 0.2μm Si_(3)N_(4) powder has the most uniform microstructure,the largest average length-diameter ratio ofβ-Si_(3)N_(4) grains,the highest flexural strength and Vickers hardness,which are 5.0,(1364±65)MPa,(15.72±0.8)GPa,respectively;the sample sintered at 1745℃with 2.3μm Si_(3)N_(4) powder has the smallest average length-diameter ratio ofβ-Si_(3)N_(4) grains,the lowest flexural strength and Vickers hardness,which are 3.30,(846±49)MPa and(13.82±0.8)GPa,respectively.
作者
徐广平
何江荣
刘鹏程
茆忠军
秦笑威
谢志鹏
Xu Guangping;He Jiangrong;Liu Pengcheng;Mao Zhongjun;Qin Xiaowei;Xie Zhipeng(不详;Jiangsu Zhonglei Energy Save Science and Technology Development Co.,Ltd.,Yancheng 224299,Jiangsu,China)
出处
《耐火材料》
CAS
北大核心
2022年第3期214-217,221,共5页
Refractories
关键词
Si_(3)N_(4)陶瓷
振荡压力烧结
相对密度
长径比
抗弯强度
维氏硬度
silicon nitride ceramics
oscillatory pressure sintering
relative density
grain length-diameter ratio
flexural strength
Vickers hardness
