分散剂和pH对水基SiC-Si料浆流变性和Zeta电位的影响
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摘要
为了制备高固含量流动性良好的SiC-Si料浆,以SiC粉和Si粉为主要原料,分散剂为聚乙烯吡咯烷酮(PVP)、六偏磷酸钠(SHMP)、聚乙二醇(PEG400),用分析纯HCl、NH_3·H_2O调节料浆的pH,采用注浆成型法制备水基SiC-Si料浆。研究了分散剂的种类、添加量以及浆体的pH对SiC-Si料浆性能的影响。结果表明:外加质量分数分别为0. 25%的PVP、0. 85%的PEG400、0. 21%的SHMP作为复合分散剂,调节pH至8. 7左右时,可以得到黏度为135 mPa·s的固相体积分数为45%的稳定分散的SiC-Si料浆。
This work aims at preparing SiC-Si slurry with high solid content and good fluidity. Water-based SiC-Si slurry was prepared by the grouting method using SiC powder and Si powder as the main raw materials,and polyvinylpyrrolidone( PVP),sodium hexametaphosphate( SHMP) and polyethylene glycol( PEG400) as the dispersants. The pH value of the slurry was adjusted by analytically pure HCl and NH_3·H_2O. The effects of the type and addition of the dispersing agent as well as the pH value of the slurry on the properties of the SiC-Si slurry were studied. The results show that using a composite dispersant of 0.25% PVP + 0. 85% PEG400 + 0. 21% SHMP( by mass),when the pH value is around 8. 7,a stable SiC-Si dispersed slurry with a solid phase volume fraction of 45% and a viscosity of 135 m Pa·s was obtained.
This work aims at preparing SiC-Si slurry with high solid content and good fluidity. Water-based SiC-Si slurry was prepared by the grouting method using SiC powder and Si powder as the main raw materials,and polyvinylpyrrolidone( PVP),sodium hexametaphosphate( SHMP) and polyethylene glycol( PEG400) as the dispersants. The pH value of the slurry was adjusted by analytically pure HCl and NH_3·H_2O. The effects of the type and addition of the dispersing agent as well as the pH value of the slurry on the properties of the SiC-Si slurry were studied. The results show that using a composite dispersant of 0.25% PVP + 0. 85% PEG400 + 0. 21% SHMP( by mass),when the pH value is around 8. 7,a stable SiC-Si dispersed slurry with a solid phase volume fraction of 45% and a viscosity of 135 m Pa·s was obtained.
引文
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[2]袁硕伟,杨自春.氮化硅结合碳化硅砖的微观结构模型及热冲击载荷下裂纹起始行为[J].耐火材料,2015,49(6):426-431.
[3]李柳生,陈冬梅,邱杰.氧氮化硅结合碳化硅窑具材料研究[J].耐火材料,1999,33(3):3-6.
[4]RAMACHANDRA R R,ROOPA H N,KANNAN T S.Slip casting and reaction nitridation of silicon-silicon carbide mixtures[J].JEur Ceram Soc,1999,19(12):2145-2153.
[5]晏建民,马奇,李配配,等.水基注浆成型碳化硅坯体的研究[J].中国材料科技与设备,2014(2):57-59.
[6]李再耕.耐火浇注料用分散剂进展[J].耐火材料,2010,44(2):144-148.
[7]熊礼俊,王刚,郭鹏,等.氧化预处理温度对Si粉流变性水解及氮化反应的影响[J].耐火材料,2016,55(6):436-439.
[8]陆成龙,彭玮珂,邓承继,等.SiO2微粉悬浮液的流变性能[J].耐火材料,2014,48(1):46-49,53.
[9]TABRIZIAN P,GOLESTANIFARD F,ALEM A,et al.The influence of gel-casting parameters on the preparation of Si porous bodies[J].Mater Lett,2016,183:19-22.
[10]HWANG Q,GU M,SUN K,et al.Effect of calcination on rheological behavior of silicon carbide aqueous suspension[J].J Mater Sci,2002,21(7):569-571.
[11]XIAO C X,GAO L,LU M,et al.Effect of polyvinylpyrrolidone on rheology of aqueous Si C suspensions with polyethylene glycol as binder[J].Colloid Surface A,2010,368:53-57.
[12]PRADHAN M,BHARGAVA P.Influence of sucrose addition on rheology of aluminaslurries dispersed with a polyacrylate dispersant[J].Am Ceram Soc,2005,88(4):833-838.
[13]余同暑,王守业,曹喜营.六偏磷酸钠对几种浆体ζ电位、等电点和流变特性的影响[J].耐火材料,2010,44(1):11-13.