摘要
以Al_2O_3-Y_2O_3和Mg O-Y_2O_3为烧结助剂,通过热压烧结分别在1600℃和1800℃下制备Si_3N_4陶瓷。结果表明:以Al_2O_3-Y_2O_3助剂时,在1800℃热压烧结制备的Si_3N_4陶瓷具有显著的双峰结构和优异的综合力学性能,其硬度、抗弯强度、断裂韧性分别为15.60±0.27 GPa、1105.99±68.39 MPa和7.13±0.37 MPa·m^(1/2);以Mg O-Y_2O_3为助剂时,在1600℃热压烧结制备的Si_3N_4陶瓷具有较高的致密度,显微结构含有长径比较高的晶须状Si_3N_4晶粒,并且具有优异的综合力学性能,其硬度、抗弯强度、断裂韧性分别为16.53±0.21 GPa、1166.90±61.73 MPa和6.74±0.17 MPa·m^(1/2)。因此,在研究烧结助剂对Si_3N_4陶瓷性能的影响时,需结合其特定合适的烧结温度,才能有望获得综合性能优异的Si_3N_4陶瓷。
The Si3N4 ceramics were prepared by hot pressing at 1600 ℃ and 1800℃ using Al2O3-Y2O3 and MgO-Y2O3 as sintering additives, respectively. With the addition of Al2O3-Y2O3, the Si3N4 ceramics produced at 1800 ℃ showed remarkable bimodal distribution and excellent comprehensive mechanical properties, and its Vickers hardness, fexural strength and fracture toughness were 15.60 ± 0.27 GPa, 1105.99 ± 68.39 MPa and 7.13 ± 0.37 MPa·m1/2, respectively. However, with the addition of MgO-Y2O3, the Si3N4 ceramics fabricated at 1600 ℃showed higher density, contained whisker-like Si3N4 grains with high aspect ratio, and exhibited excellent integrated mechanical properties, and its Vickers hardness, flexural strength and fracture toughness were 16.53 ± 0.21 GPa, 1166.90 ± 61.73 MPa and 6.74 ± 0.17 MPa·m^1/2, respectively. Therefore, in order to obtain Si3N4 ceramics with superior mechanical properties, the corresponding sintering temperature for each sintering aid needs to be considered simultaneously.
作者
刘聪
郭伟明
付君宇
童文欣
伍尚华
LIU Cong;GUO Weiming;FU Junyu;TONG Wenxin;WU Shanghua(Guangdong University of Technology, Guangzhou 510006, Guangdong, China;Chaozhou Three-circle （Group） Co., Ltd., Chaozhou 515646, Guangdong, China)
出处
《陶瓷学报》
CAS
北大核心
2018年第2期165-169,共5页
Journal of Ceramics
基金
2014年广东省"扬帆计划"引进创新团队专项(2014YT02C049)
关键词
SI3N4陶瓷
烧结助剂
烧结温度
显微结构
力学性能
Si3N4 ceramics
sintering aids
sintering temperature
microstructure
mechanical property
