| 三元复合烧结助剂Er2O3-Mg2Si-Yb2O3对氮化硅陶瓷性能的影响 |
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| 引用本文： | 姜常玺,周立娟,庄英华,廖圣俊,王建军.三元复合烧结助剂Er2O3-Mg2Si-Yb2O3对氮化硅陶瓷性能的影响[J].硅酸盐通报,2022,41(4):1423-1432. |
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| 作者姓名： | 姜常玺 周立娟 庄英华 廖圣俊 王建军 |
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| 作者单位： | 山东理工大学材料科学与工程学院,淄博 255000 |
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| 基金项目： | 山东省自然科学基金(ZR2020ME026)； |
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| 摘 要： | 以Er2O3-Mg2Si-Yb2O3为三元复合烧结助剂,制备了力学性能优异的高导热氮化硅陶瓷,研究了Er2O3-Mg2Si-Yb2O3体系对氮化硅陶瓷致密化、微观结构、力学性能、热导率的影响。研究表明,当添加5%(质量分数,下同)Er2O3+2%Mg2Si+4%Yb2O3烧结助剂时,烧结助剂对氮化硅陶瓷致密度与晶界相含量的平衡效果最佳,此时氮化硅陶瓷具有最佳性能:抗弯强度为765 MPa,断裂韧性为7.2 MPa·m1/2,热导率为67 W/(m·K)。在烧结过程中,只添加5%Er2O3+2%Mg2Si的烧结助剂产生的液相量少且黏度高,不能使氮化硅陶瓷完成致密化;此外,当添加的Yb2O3含量超过4%时,烧结助剂产生大量的晶界相,降低了氮化硅陶瓷的性能。
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| 关 键 词： | 氮化硅陶瓷 Er2O3-Mg2Si-Yb2O3烧结助剂 致密度 微观结构 力学性能 热导率 |
| 收稿时间： | 2021-12-14 |
Effect of Ternary Composite Sintering Agent Er2 O3-Mg2 Si-Yb2 O3 on Properties of Silicon Nitride Ceramics |
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| JIANG Changxi,ZHOU Lijuan,ZHUANG Yinghua,LIAO Shengjun,WANG Jianjun.Effect of Ternary Composite Sintering Agent Er2 O3-Mg2 Si-Yb2 O3 on Properties of Silicon Nitride Ceramics[J].Bulletin of the Chinese Ceramic Society,2022,41(4):1423-1432. |
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| Authors: | JIANG Changxi ZHOU Lijuan ZHUANG Yinghua LIAO Shengjun WANG Jianjun |
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| Affiliation: | School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China |
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| Abstract: | High thermal conductivity Si3N4 ceramics with excellent mechanical properties were prepared by using ternary composite sintering agent Er2O3-Mg2Si-Yb2O3. The effects of Er2O3-Mg2Si-Yb2O3 system on densification, microstructure, mechanical properties and thermal conductivity of Si3N4 ceramics were studied. The results show that when the sintering agent is 5% (mass fraction, the same below) Er2O3+2%Mg2Si+4%Yb2O3, the effect of sintering agent on the balance between density and the content of grain boundary phase of Si3N4 ceramics is the best. At the moment, Si3N4 ceramics have the best properties, such as bending strength of 765 MPa, fracture toughness of 7.2 MPa·m1/2, and thermal conductivity of 67 W/(m·K). In the sintering process, adding only 5%Er2O3+2%Mg2Si produces less liquid phase with high viscosity, which cannot densify the Si3N4 ceramics. When the content of Yb2O3 exceeds 4%, the sintering agent produces a large amount of grain boundary phase, which reduces the properties of Si3N4 ceramics. |
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| Keywords: | silicon nitride ceramics Er2O3-Mg2Si-Yb2O3 sintering agent density microstructure mechanical property thermal conductivity |
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