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凝胶注模制备碳化硼多孔陶瓷
作者:董善亮1 霍思嘉2 崔立宇2 张宇民1 王玉金2 
单位:1. 哈尔滨工业大学 复合材料与结构研究所 哈尔滨 150080 2. 哈尔滨工业大学材料科学与工程学院 特种陶瓷研究所 哈尔滨 150080 
关键词:凝胶注模 碳化硼 多孔陶瓷 碳化锆/硼化锆复合材料 
分类号:TQ174.5
出版年,卷(期):页码:2017,45(9):1316-1321
DOI:10.14062/j.issn.0454-5648.2017.09.13
摘要:

 以琼脂糖大分子为凝胶体系、聚丙烯酸为分散剂,采用凝胶注模工艺制备B4C坯体,经过1 800~2 000 ℃烧结,制备得到B4C多孔陶瓷。结果表明:pH值为7.5、分散剂含量为0.15% (体积分数)时,陶瓷浆料的稳定性和流动性最佳,制备得到固相含量为45% (体积分数)的低黏度陶瓷浆料。随着烧结温度升高,多孔陶瓷的通孔率下降,1 800 ℃烧结得到的块体通孔率为100%,气孔呈明显的单峰分布,孔径大小为1 μm。多孔陶瓷的抗弯强度在60 MPa左右。Zr金属浸渗B4C多孔陶瓷后得到ZrC/ZrB2复合材料,其微观组织随渗层深度变化出现分层现象。

 

 Boron carbide (B4C) preform was prepared via gel–casting with macromolecule agarose as a gel system and polyacrylic acid as a dispersant. The preform was sintered at 1 800–2 000 ℃ to obtain a porous B4C ceramic. The results show that the maximum solid loading of B4C slurry with a lower viscosity is 45% (in volume fraction) at pH value of 7.5 and dispersant content of 0.15% (in volume fraction). The open porosity decreases with increasing sintering temperature, and the open porosity is 100% at 1 800 ℃. The pore size distribution of porous ceramics presents a unimodal model with the average pore size of 1 μm. The flexural strength of B4C porous ceramics is 60 MPa, which could be used for the subsequent reactive melt infiltration. The expected ZrC/ZrB2 composite is obtained when Zr infiltrates into the porous B4C ceramic. The microstructure of the composite is layered in the infiltration direction.

 
基金项目:
国家自然科学基金(51472060,51532006)资助。
作者简介:
董善亮(1986—),男,博士研究生。
参考文献:

 [1]KUWABARA K. Some characteristics and applications of ZrB2 ceramics[J]. Bull Ceram Soc Jpn, 2002, 37(4): 267–271.

[2]UPADHYA K, YANG J M, HOFFMANN W P. Materials for ultrahigh temperature structural applications[J]. Am Ceram Soc Bull, 1997, 76(12): 51–56. 
[3]GUO S Q, NISHMURA T, KAGAWA Y, et al. Thermal and electric properties in hot-pressed ZrB2–MoSi2–SiC composites[J]. J Am Ceram Soc, 2007, 90(7): 2255–2258.
[4]KIDA O, SEGAWA Y. ZrB2 composite sintered materials[P]. US Patent, 4636481, 1987.
[5]NORASETTHEKUL S, EUNANK P T, BRADLEY W L, et al. Use of zirconium diboride-copper as an electrode in plasma applications[J]. J Mater Sci, 1999, 34(6): 1261–1270.
[6]ZHANG X H, WANG Z, HU P, et al. Mechanical properties and thermal shock resistance of ZrB2–SiC ceramic toughened with graphite flake and SiC whiskers[J]. Scripta Mater, 2009, 61(8): 809–812.
[7]SHIM S H, NIIHARA K, AUH K H, et al. Crystallographic orientation of ZrB2–ZrC composites manufactured by the spark plasma sintering method[J]. J Microscopy, 2002, 205(3): 238–244.
[8]RANGARAJ L, SURESHA S J, DIVAKAR C, et al. Low-temperature processing of ZrB2–ZrC composites by reactive hot pressing[J]. Metall Mater Trans A, 2008, 39(7): 1496–1505.
[9]JOHNSON W B, NAGELBERG A S, BREVAL E. Kinetics of formation of a platelet-reinforced ceramic composite prepared by the directed reaction of zirconium with boron carbide[J]. J Am Ceram Soc, 1991, 74(9): 2093–2101.
[10]BREVAL E, JOHNSON W B. Microstructure of platelet-reinforced ceramics prepared by the directed reaction of zirconium with boron carbide[J]. J Am Ceram Soc, 1992, 75(8): 2139–2145.
[11]ZHANG S, WANG S, ZHU Y, et al. Fabrication of ZrB2–ZrC-based composites by reactive melt infiltration at relative low temperature[J]. Scripta Mater, 2011, 65(2): 139–142.
[12]MA Q C, ZHANG G J, KAN Y M, et al. Effect of additives introduced by ball milling on sintering behavior and mechanical properties of hot-pressed B4C ceramics[J]. Ceram Int, 2010, 36(1): 167–171.
[13]MATSUMOTO A, GOTO T, KAWAKAMI A. Slip casting and pressureless sintering of boron carbide and its application to the nuclear field[C]. J Ceram Soc Jpn, 2004: S399–S402.
[14]QIAO Y, LIU Y, LIU A, et al. Boron carbide green sheet processed by environmental friendly non-aqueous tape casting[J]. Ceram Int, 2012, 38(3): 2319–2324.
[15]王小峰, 王日初, 彭超群, 等. 凝胶注模研究进展[J]. 中国有色金属学报, 2010, 20(3): 494–509.
WANG X F, WANG R C, PENG C Q, et al. Chin J Nonferr (in Chinese), 2010, 20(3): 496–509.
[16]谢志鹏, 杨金龙, 陈亚丽, 等. 琼脂糖凝胶大分子在陶瓷原位凝固成型中的应用[J]. 硅酸盐学报, 1999, 27(1): 16–22.
XIE Z P, YANG J L, CHEN Y L, et al. J Chin Ceram Soc, 1999, 27(1): 16–22.
[17]霍思嘉, 王东, 王玉金, 等. 凝胶注模制备碳化钨多孔陶瓷[J]. 硅酸盐学报, 2016, 44(12): 1681–1685.
HUO S J, WANG D, WANG Y J, et al. J Chin Ceram Soc, 2016, 44(12): 1681–1685.
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