通过热解聚碳硅烷(PCS)和聚硼硅氮烷(PBS)两种有机先驱体混合物,制得非晶态SiC/SiBCN复合陶瓷,然后对复合陶瓷进行高温热处理,研究其析晶规律及影响因素.利用热分析(TG-DTA)、X射线衍射(XRD)及透射电子显微镜(TEM)分别研究先驱体的热解机理,先驱体的组成、热解温度和时间对SiC/SiBCN复合陶瓷结晶性的影响,以及复合陶瓷的微观结构.结果表明,先驱体的组成和热处理温度对复合陶瓷的析晶行为有重要影响.当PBS/PCS=1(w/w),1100 ℃/2 h制得非晶态SiC/SiBCN复合陶瓷;1400 ℃/4 h PCS热解转变的非晶SiC开始结晶,晶粒尺寸～3 nm;1500 ℃/4 h 得到产物的相结构为～10 nm 的SiC纳米晶均匀弥散在PBS热解得到的非晶态SiBCN中;1700 ℃/2 h SiC的晶粒尺寸～16 nm;1800 ℃/2 h非晶态SiBCN开始析晶,SiC晶粒尺寸～35 nm.
参考文献
| [1] | LEE B .Advanced Materials & Powders Handbook[J].American Ceramic Society Bulletin,2000,79(06):52-53. |
| [2] | Martin Christ;Günter Thurn .High-Temperature Mechanical Properties of Si-B-C-N-Precursor-Derived Amorphous Ceramics and the Applicability of Deformation Models Developed for Metallic Glasses[J].Journal of the American Ceramic Society,2000(12):3025-3032. |
| [3] | Butchereit E;Nickel K G .Precursor-Derived Si-B-C-N Ceramics:Oxidation Kinetics[J].Journal of the American Ceramic Society,2001,10(84):2184-2188. |
| [4] | Riedel R.;Dressler W.;Ruwisch L.;Bill J.;Aldinger F.;Kienzle A. .A SILICOBORON CARBONITRIDE CERAMIC STABLE TO 2,000-DEGREES-C[J].Nature,1996(6594):796-798. |
| [5] | Ravi Kumar N V;Prinz S;Cai Y et al.Crystallization and Creep Behavior of Si-B-C-N Ceramices[J].Acta Materialia,2005,53:4567-4578. |
| [6] | Ravi Kumar;F. Phillipp;F. Aldinger .Oxidation induced effects on the creep properties of nano-crystalline porous Si-B-C-N ceramics[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(0):251-258. |
| [7] | N. V. Ravi Kumar;R. Mager;Y. Cai .High temperature deformation behaviour of crystallized Si-B-C-N ceramics obtained from a boron modified poly(vinyl)silazane polymeric precursor[J].Scripta materialia,2004(1):65-69. |
| [8] | 张跃;李亚静 .非晶Si-B-C-N四元陶瓷前驱物的制备方法及其制该前驱物的装置[P].CN:101492295A,2009-07-29. |
| [9] | Hasegawa Y .Synthesis of Continuous Silicon Carbide Fibre,Part 2,Conversion of Polycarbosilane Fibre into Silicon Carbide Fibres[J].Journal of Materials Science,1980,24:720-728. |
| [10] | Zhou C C .Preparation of Carbon Fiber Reinforced Silicon Carbide Composite and the Thermal-insulation Marerials for Aerodynamic Rudder at Low Temperratures[D].长沙:国防科学技术大学,2008. |
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%