摘要
本研究中,以石油焦为造孔剂、Y2O3-Al2O3为烧结助剂,通过注浆成型制备出多孔氮化硅陶瓷。研究石油焦的加入量对多孔氮化硅陶瓷微观结构、力学性能及气体透气性的影响。结果表明:多孔氮化硅陶瓷的微孔是由长棒状的β-Si3N4晶粒互相搭接而成,大孔是由石油焦燃烧而成。随着石油焦加入量的增加,气孔率及达西渗透系数(μ)增大,但试样的抗弯强度降低。在起始α-Si3N4粉末中添加10wt%～50wt%石油焦、5wt%Y2O3-3wt%Al2O31800℃下保温2 h制备出气孔率为37.08%～59.40%、抗弯强度为52.00～154.27 MPa、μ值为(3.04～6.87)×10-13m2的多孔氮化硅陶瓷。
Porous Si3N4 ceramics were fabricated by slip casting method using petroleum coke as pore forming agent and Y2O3-Al2O3 as sintering additives.The effects of petroleum coke on the microstructure,mechanical properties and gas permeability of porous Si3N4 ceramics were studied.The results showed that the smaller pores originated from the connection of rod-like β-Si3N4 grains and the larger pores formed by burning out the petroleum coke.As the petroleum coke increasing,the porosity and Darcy permeability（μ） increased,but the flexural strength decreased.Porous Si3N4 ceramics with the following properties were obtained by adding 10wt%-50wt% petroleum coke,5 wt%Y2O3-3 wt%Al2O3 at 1800 ℃ for 2 h,the porosity of 37.08%-59.40%,the flexural strength of 52.00-154.27 MPa and the Darcy permeability of（3.04-6.87）×10-13 m2.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第3期656-660,共5页
Journal of Synthetic Crystals
基金
高等学校博士学科点专项科研基金(20100201110036)
江苏省新型环保重点实验室开放课题基金资助(AE201013)
关键词
气孔率
氮化硅
微观结构
力学性能
达西渗透系数
porosity
Si3 N4
microstructure
mechanical properties
Darcy permeability
