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固相含量对多孔Si3N4显微结构及性能的影响
作者:尉磊1 2 汪长安2 魏乔苑2 黄勇2 孙加林1 
单位:1. 北京科技大学材料科学与工程学院 无机非金属材料系 北京 100083 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 
关键词:氮化硅 多孔陶瓷 透波 性能 
分类号:TQ174
出版年,卷(期):页码:2011,39(7):159-162
DOI:
摘要:

以氮化硅为原料,以叔丁醇为溶剂,采用凝胶注模成型工艺,在无压烧结温度1 780 ℃、保温时间1.5 h、流动氮气气氛下,成功制备出具有高强度和高气孔率的多孔氮化硅陶瓷透波材料。通过对材料的密度、孔隙率、压缩强度和介电性能测试及显微组织观察,系统分析了固相含量对透波多孔陶瓷性能的影响。研究结果表明:随着固相含量的提高,孔隙率与介电性能呈下降趋势而抗压强度呈上升趋势。当固相体积分数为15%时,制备出孔隙率达到63.1%、压缩强度达到(329.4±1.6) MPa、介电常数在10 MHz频率下达到3.99的高性能多孔透波氮化硅陶瓷。

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The wave-transparent porous Si3N4 ceramics with higher strength/porosity were prepared via tert-butyl alcohol (TBA)- based gel-casting process and pressureless sintering in nitrogen at 1 780 ℃ for 1.5 h. The density, porosity, compressive strength and dielectric constant and loss were investigated, and the microstructure was analyzed. The effect of solid loading in initial slurry on the properties of wave-transparent porous Si3N4 ceramics was discussed. The results show that the porosity and dielectric properties decrease and the compression strength increases with increasing the solid loading. The wave-transparent silicon nitride ceramics with the porosity of 63.1%, compressive strength of (329.4±1.6) MPa and dielectric constant of 3.99 at 10 MHz were obtained when the solid loading was 15% in the initial slurry.

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基金项目:
国家自然科学基金(90916025);国家“863”计划(2007AA03ZA- 435);国家“973”计划(2006CB605207-2)资助项目。
作者简介:
博士研究生
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参考文献:

[1] YANG J, YANG J F, SHAN S Y, et al. Effect of sintering additives on microstructure and mechanical properties of porous silicon nitride ceramics [J]. J Am Ceram Soc, 2006, 89(12): 3843-3845. [2] JIANG G P, YANG J F, GAO J Q. Porous silicon nitride ceramics prepared by extrusion using starch as binder [J]. J Am Ceram Soc, 2008, 91(11): 3510-3516. [3] TATSUKI O. Microstructural design and mechanical properties of porous silicon nitride [J]. Mater Sci Eng A, 2008, 498: 5-11. [4] YOSHIAKI I, NAOKI K, TATSUKI O. High performance porous silicon nitrides [J]. J Eur Ceram Soc, 2002, 22: 2489-2494. [5] DING S Q, ZENG Y P, JIANG D J. Oxidation bonding of porous silicon nitride ceramics with high strength and low dielectric constant [J]. Mater Lett, 2007, 61: 2277-2280. [6] ARANZAZU D, STUART H. Characterisation of porous silicon nitride materials produced with starch [J]. J Eur Ceram Soc, 2004, 24: 413- 419. [7] WANG H J, YU J L, ZHANG J, et al. Preparation and properties of pressureless-sintered porous Si3N4 [J]. J Mater Sci, 2010, 45: 3671- 3676. [8] YU J L, WANG H J, ZENG H, et al. Effect of monomer content on physical properties of silicon nitride ceramic green body prepared by gelcasting [J]. Ceram Int, 2009, 35: 1039-1044. [9] XU J, LUO F, ZHU D M, et al. Effect of presintering on the dielectric and mechanical properties of porous reaction-bonded silicon nitride [J]. Mater Sci Eng A, 2008, 488: 167-171. [10] LI F S, ZHOU W C, HU H J, et al. High performance porous Si3N4 ceramics prepared by coated pore-forming agent method [J]. Ceram Int, 2009, 35: 3169-3173. [11] COBLE R L, KINGERY W D. Effect of porosity on physical properties of sintered alumina [J]. J Am Ceram Soc, 1956, 39: 377-385. [12] RYSHKEWITCH E. Compression strength of porous sintered alumina and zirconia [J]. J Am Ceram Soc, 1953, 36: 65-68. [13] KINGERY W D, BOWEN H K, UHLMANN D R. Introduction to ceramics [M]. New York: John Wiley & Sons, 1976: 950-962.

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