采用甲基氢二氯硅烷的氨解产物硅氮烷环体(MHSZ)为原料,以四丁基氟化铵为催化剂,制备了高分子量的硅氮烷聚合物(PHSZ),结合红外、核磁、凝胶色谱仪和热重分析了反应时间对合成的PHSZ结构、组成、分子量和陶瓷产率的影响.考察了低温氨气,高温N2气氛处理工艺对热解产物结构和组成的影响.结果表明,随着反应时间的延长,PHSZ高聚物的分子量提高,热失重降低;采用该热解方式PHSZ可转化为含碳量仅为0.5wt％的Si3N4材料,热解样品在1 600℃时完全结晶,晶相主要是α-Si3N4.
参考文献
| [1] | Ding S,Zeng Y P,Jiang D .Oxidation bonding of porous silicon nitride ceramics with high strength and low dielectric constant[J].Materials Letters,2007,61(11):2277-2280,2007. |
| [2] | Ziegler G,Heinrich J,W(o)tting G .Ziegler G,Heinrich J,W(o)tting G.Relationships between processing,microstructure and properties of dense and reaction-bonded silicon nitride[J].Journal of Materials Science,1987,22(9):3041-3086,1987. |
| [3] | Inagaki Y,Kondo N,Ohji T .High performance porous silicon nitrides[J].Journal of the European Ceramic Society,2002,61 |
| [4] | Lücke J,Hacker J,Suttor D,et al .Synthesis and characterization of silazane-based polymers as precursors for ceramic matrix composites[J].Applied Organometallic Chemistry,1997,11(2):181-194,1997. |
| [5] | 徐彩虹,谢择民.氮化硅陶瓷前驱体研究进展[J].高分子通报,2000(04):27-33. |
| [6] | Boyer W A.Catalytic polymerization of silazanes[P]:USP 3 143 514,1964-8-4:3,1964. |
| [7] | Youngdahl K A,Laine R M,Kennish R A,et al.New catalytic routes to preceramic polymers:ceramic precursors to silicon nitride and silicon-carbide nitride[M].MRS Proceedings,Cambridge University Press,1988:489,1988. |
| [8] | Blum Y D,Dodge A L,Laine R M,et al.Polysilazanes and related compositions,processes and uses[P].USP 5 322913,1994-6-21:8,1994. |
| [9] | Scyferth D,Wiseman G H.Preceramic organosilazane polymers[P].USP 4 482 669,1984-11-13:7,1984. |
| [10] | Octavio F,Thomas S,Motz G,et al .Selective crosslinking of oligosilazanes to tailored meltable polysilazanes for the processing of ceramic[J].J.Mater.Chem.A,2013,1 |
| [11] | 闫联生,李贺军,崔红.高温陶瓷透波材料研究进展[J].宇航材料工艺,2004(02):14-16. |
| [12] | Dando N R,Perrotta A J,Strohmann C,et al .Methylhydridopolysilazane and its pyrolytic conversion to silicon nitride-silicon carbide (Si3 N4/SiC) ceramics[J].Chemistry of Materials,1993,5(11):1624-1630,1993. |
| [13] | Richard L W,Riley S .Studies of silicon-nitrogen compounds.The base-catalyzed elimination of silane from trisilylamine[J].J.Am.Chem.Soc.,1966,88 |
| [14] | Corriu R J P,Leclercq D,Vioux A,et al .Silicon-nitrogen bond formation by nucleophilic activation of silicon-hydrogen bonds[J].Journal of Organometallic Chemistry,1991,406:C1-C4,1991. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%