为获得适用于苛刻环境下的高强度、高气孔率氮化硅陶瓷,采用原位生成纳米碳化硅增强相的方法,以提高材料的性能.从改善凝胶注浆料稳定性着手,利用铈离子(ce~(4+))和醇羟基组成的氧化还原体系对炭黑表面进行接枝改性,将改性后的炭黑与氮化硅粉配合,用于制备多组分凝胶注模成型用复合浆料.探讨了水溶液中丙烯酰胺在炭黑表面接枝反应的影响因素,利用红外谱、热失重、透射电镜等分析手段验证了炭黑表面的接枝情况.研究表明:经接枝改性的炭黑在水分散体系中具有良好的分散稳定性,炭黑经接枝处理后其阻聚性明显下降,可以制备出均一、稳定的多组分浆料,很好地应用于氮化硅凝胶注模成型工艺.
In order to obtain silicon nitride ceramics with high strength and high porosity applicable for harsh environment, in-situ fabrication of silicon carbide nano reinfercement phase was employed to improve proper-ties of the material. To enhance the stability of gel casting slurry, free radical graft of acrylamide onto carbon black surface was achieved by using a redox initiating system consisting of ceric ions (Ce~(4+)) and hydroxyl groups. Multi-component suspension was prepared by this grafted carbon black and silicon nitride powder. The factors effecting the grafting reaction were discussed. The grafting was proved by infrared spectrophotometer (IR), thermogravimetry (TG) and transmission electronic microscopy (TEM) analysis. The research shows that grafted carbon black has excellent dispersion stability, the block of reaction is weakened greatly after sur-face modification, and uniform multi-component suspension can be prepared, which has benefits for silicon ni-tride gel casting techniques.
参考文献
| [1] | Jian-Feng Yang;Guo-Jun Zhang;Tatsuki Ohji .Fabrication of Low-Shrinkage, Porous Silicon Nitride Ceramics by Addition of a Small Amount of Carbon[J].Journal of the American Ceramic Society,2001(7):1639-1641. |
| [2] | Jian-Feng Yang;Guo-Jun Zhang;Naoki Kondo;Tatsuki Ohji .Synthesis and properties of porous Si_3N_4/SiC nanocomposites by carbothermal reaction between Si_3N_4 and carbon[J].Acta materialia,2002(19):4831-4840. |
| [3] | 刘开琪,宋慎泰,洪彦若,孙加林.凝胶注模成型工艺的研究进展[J].耐火材料,2004(05):343-346. |
| [4] | 陈玉峰,王华,唐婕,樊启晟.炭黑对丙烯酰胺单体自由基聚合的影响[J].硅酸盐学报,2003(06):581-585,590. |
| [5] | 张雯,王红洁,张勇,金志浩.凝胶注模工艺制备高强度多孔氮化硅陶瓷[J].无机材料学报,2004(04):743-748. |
| [6] | 张雯,王红洁,张勇,金志浩.凝胶注模成型制备纳米复合多孔氮化硅陶瓷[J].复合材料学报,2004(05):83-87. |
| [7] | 肖英,李兰英,张瑞,戴晓雁.获取优良分散性炭黑的表面硝酸氧化[J].材料科学与工艺,2005(01):75-77,81. |
| [8] | 张学铭,何北海,李军荣,赵光磊.表面活性剂对水性油墨胶体稳定性的影响[J].精细化工,2007(04):332-335. |
| [9] | 姚素薇,谢扬,白世和,张卫国,王宏智.氧化超声降解聚乙烯醇制备接枝炭黑[J].材料科学与工艺,2003(04):423-425. |
| [10] | 吴壁耀.丙烯酰胺在炭黑表面接枝聚合研究[J].高等学校化学学报,1995(10):1641. |
| [11] | 周建华,李鹏,马毅,王华勋.丙烯酰胺在炭黑表面接枝改性的研究[J].山东轻工业学院学报(自然科学版),2004(01):61-65,77. |
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