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| 烧结助剂含量对多孔Si3N4/BN复合陶瓷力学性能和介电性能的影响 | |
| 引用本文： | 董薇,汪长安,尉磊,欧阳世翕. 烧结助剂含量对多孔Si3N4/BN复合陶瓷力学性能和介电性能的影响[J]. 硅酸盐学报, 2012, 40(6): 851-855 |
| 作者姓名： | 董薇 汪长安 尉磊 欧阳世翕 |
| 作者单位： | 1. 中国建筑材料科学研究总院,北京100024 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室,北京100084 2. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室,北京,100084 3. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室,北京100084 北京科技大学材料科学与工程学院,北京100083 4. 中国建筑材料科学研究总院,北京,100024 |
| 基金项目： | 国家自然科学基金(90916025,90816019,51172119);纤维材料改性国家重点实验室(东华大学)资助课题 |
| 摘 要： | 以Si3N4和BN为原料,叔丁醇为溶剂,SiO2、Y2O3和Al2O3为烧结助剂,采用凝胶注模成型工艺制备具有高强度、低介电常数多孔Si3N4/BN复合陶瓷。研究了Y2O3和Al2O3含量对多孔陶瓷气孔率、孔径分布、物相组成、显微结构、抗弯强度和介电常数的影响。结果表明:通过调节Y2O3和Al2O3含量,多孔Si3N4/BN复合陶瓷的气孔率由55%增加到68%,气孔尺寸呈单峰分布,平均孔径为0.89～1.02μm;抗弯强度和相对介电常数随Y2O3和Al2O3含量的增加而单调增大,抗弯强度和相对介电常数的变化范围分别为29.9～60.9 MPa和2.30～2.85;通过调节Y2O3和Al2O3含量调控气孔率,能够获得介电性能和力学性能可调的高性能透波材料。 |
| 关 键 词： | 氮化硅 氮化硼 多孔陶瓷 叔丁醇 凝胶注模 介电性能 |
Effect of Sintering Additive Content on Mechanical and Dielectric Properties of Porous Si3N4/BN Composite Ceramics |
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| Affiliation: | DONG Wei1,2,WANG Chang′an2,YU Lei2,3,OUYANG Shixi1(1.China Building Materials Academy,Beijing 100024,China;2.State Key Lab of New Ceramics and Fine Processing,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;3.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China) |
| Abstract: | Porous Si3N4/BN composite ceramics with high strength and low dielectric constant were prepared by tert-butyl alcohol(TBA)-based gel-casting process using Si3N4 and BN as raw material,and SiO2,Y2O3 and Al2O3 as sintering additives.The influences of Y2O3 and Al2O3 contents on porosity,pore size distribution,phase composition and microstructure were investigated,and the effect on flexural strength and dielectric constant were also analyzed.The results showed that the porous Si3N4/BN ceramics with high porosity ranging from 55% to 68% were prepared by adjusting the Y2O3 and Al2O3 content.A uniform pore size distribution for porous Si3N4/BN ceramics was observed,and the mean pore size ranged from 0.89 to 1.02 μm.The flexural strength and relative dielectric constant of po-rous Si3N4/BN composite ceramics increased with increasing the Y2O3 and Al2O3 content.The flexural strength and relative dielectric constant ranged from 29.9 MPa to 60.9 MPa and 2.30 to 2.85,respectively.Through adjusting the Y2O3 and Al2O3 content,the porosity can be effectively controlled to obtain high performance wave transmitting materials with regulatable dielectric and mechanical properties |
| Keywords: | silicon nitride boron nitride porous ceramics tert-butyl alcohol gel-casting dielectric property |
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