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| 多孔氮化硅陶瓷的微观结构、力学性能和气体透气性的研究 | |
| 引用本文： | 于方丽,白宇,杜军,王欢锐,杨建锋.多孔氮化硅陶瓷的微观结构、力学性能和气体透气性的研究[J].人工晶体学报,2012,41(3):656-660. |
| 作者姓名： | 于方丽 白宇 杜军 王欢锐 杨建锋 |
| 作者单位： | 1. 盐城工学院材料工程学院,盐城224051;西安交通大学金属材料强度国家重点实验室,西安710049 2. 西安交通大学金属材料强度国家重点实验室,西安,710049 3. 装甲兵工程学院装备再制造技术国防科技重点实验室,北京,100072 |
| 基金项目： | 高等学校博士学科点专项科研基金，江苏省新型环保重点实验室开放课题基金资助 |
| 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。 |
| 关 键 词： | 气孔率 氮化硅 微观结构 力学性能 达西渗透系数 |
Study on the Microstructure, Mechanical Properties and Gas Permeability of Porous Si3N4 Ceramics |
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| YU Fang-li , BAI Yu , DU Ju , WANG Huan-rui , YANG Jian-feng.Study on the Microstructure, Mechanical Properties and Gas Permeability of Porous Si3N4 Ceramics[J].Journal of Synthetic Crystals,2012,41(3):656-660. | |
| Authors: | YU Fang-li BAI Yu DU Ju WANG Huan-rui YANG Jian-feng |
| Institution: | 1.School of Materials Engineering,Yancheng Institute of Technology,Yancheng 224051,China; 2.State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China; 3.National Key Laboratory of Remanufacturing,Academy of Armored Force Engineering,Beijing 100072,China) |
| Abstract: | 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. |
| Keywords: | porosity Si3N4 microstructure mechanical properties Darcy permeability |
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