冰模板法制备反应结合多孔Si3N4/SiC复相陶瓷

人工晶体学报, 2014, 43(8): 1998-2005.

冰模板法制备反应结合多孔Si3N4/SiC复相陶瓷

马永华 ^1, , 罗民 ^2, , 吕玉琴 ^3, , 丁肖怡 ^4, , 候广亚 ^5,

1.宁夏大学化学化工学院,银川750021

2.宁夏大学化学化工学院,银川750021

3.宁夏大学化学化工学院,银川750021

4.宁夏大学化学化工学院,银川750021

5.浙江工业大学化学工程与材料学院,杭州310014

基金项目: 国家自然科学基金(21061012,51061015) 浙江省重中之重学科开放基金(20110922)

关键词： SiC陶瓷 , 冰模板法 , 反应结合氮化硅 , Si3N4纳米线 , Si2N2O纳米线

Ice Templating Synthesis of Reaction Bonded Porous Si3N4/SiC Composites Ceramics

Keywords： SiC ceramic , ice templating , reaction-bonded silicon nitride , Si3N4 nanowire , Si2N2O nanowire

以微米级SiC和Si粉为原料,采用冰模板法和氮化反应烧结法制备了孔道中修饰α-Si3N4、Si2N2O纳米线的β-Si3N4结合多孔SiC复相陶瓷.研究了反应烧结温度、SiC/Si比和固相含量对多孔陶瓷的物相结构、形貌、孔分布和压缩强度的影响.结果表明:多孔陶瓷具有层状定向通孔结构,孔隙率介于50％～ 70％之间,孔径分布呈现双峰分布特点;当烧结温度达到1350℃以上时,在层状孔道中交织形成α-Si3N4和Si2N2O纳米线的网络结构.反应温度超过1450℃时,通过液态Si的氮化反应原位形成β-Si3N4结合相将SiC颗粒粘结起来;当浆料中Si含量由16wt％增加至33wt％时,多孔陶瓷的开气孔率从69.78％降至62.64％,而压缩强度由2.2 MPa提高到8.73 MPa;随着浆料固相体积含量从25％增加到45％,多孔陶瓷的气孔率从71.81％降至54.85％,同时压缩强度从4.99 MPa提高到24.16 MPa.

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