研究了SiC颗粒在927℃、1027℃和1127℃空气中的高温氧化动力学.结果表明,温度越高SiC颗粒的氧化速率常数越大,氧化反应越容易进行;SiC颗粒的高温氧化分为氧化前期和氧化后期两个阶段.氧化前期的反应速率受界面化学反应的控制;氧化后期受扩散控制,其表观活化能远比氧化前期的大.SiC颗粒的高温氧化过程符合两个阶段式模型:氧化前期的氧化速率常数k_c=143.37exp(-70994/RT(mg·m~(-2)·min~(-1)),氧化后期的氧化速率常数后k_D=3.61×10~8exp(-192758/RT)(mg·m~(-2)·min~(-1)).
The oxidation kinetics of SiC particle in air at the temperature 927 ℃, 1027 ℃, 1127 ℃ was investigated by continuous weighing method in high temperature oxidation furnace. The results show that the oxidation rate constant increases with the rising temperature. Oxidation process of SiC particle can be divided into the earlier and the later period. Oxidation rate was controlled by surface chemical reaction in the earlier period and by diffusion in later period. Apparent activation energy in the later period is much bigger than that in the earlier period. The oxidation process conforms to two-stage model.In the earlier period k_c=143.37exp(-70994/RT) (mg·m~(-2)·min~(-1)), In the later period k_D=3.61×10~8exp(-192759/RT)(mg·m~(-2)min~(-1))
参考文献
| [1] | WANG Xiaohong,FENG Peizhong,QIANG Yinghuai,Researeh and Development of Fabrication & Applications for Sicp Particle-reinforced Aluminum Matrix Composites,Light Alloy Fabrication Technology,30(12),9(2002)(王晓虹,冯培忠,强颖怀,SiC_p增强铝基复合材料的制备与应用的研究进展,轻合金加工技术,30(12),9(2002)) |
| [2] | ZGOU Zhengjun,LIU Junwu,Preparation of SiC_p-Ni Compound Particle by Electroless Particle Surface Tech-nology,31(05),19(2002)(邹正军,刘君武,化学镀法制备SiCp-Ni复合粉体,表面技术,31(05),19-21(2002)) |
| [3] | WANG Hailong,Study on the SiC(Cu)/Al Ceramic-metal Composites,Master's Thesis,Zgebgzhou University (2004)(王海龙,SiC(Cu)/Al金属陶瓷复合材料的研究,硕士学位论文,郑州大学(2004)) |
| [4] | LIU Junyou,LIU Yingcai,LIU Guocai,Oxidation behav-ior of silicon carbide particales and their interfacial char-acterization in aluminum matrix composites,The Chinese Journal of Nonferrous Metals,12(05),961(2002)(刘俊友,刘英才,刘国权,SiC颗粒氧化行为及SiC_p/铝基复合材料界面特征,中国有色金属学报,12(05),961(2002)) |
| [5] | K.Mergia,D.Lafatzis,N.Moutis,Oxidation behaviour of SiC coatings,Applied Physics,92,387(2008) |
| [6] | Laurie A.Pierce,Diane M.Mieskowski,William A.Sanders,Effect of grain-boundary crystallization on the high-temperature strength of silicon nitride,Materials sci-ence,21,1348(1986) |
| [7] | GAO Ying,Oxidation Behavior of Sialon/Si3N_4-SiC in Middle-high Temperature,Master's Thesis,XI'An Uni-versity Of Architecture and Technology(2007)(高瑛,Sialon/Si_3N_4-SiC系材料中高温氧化行为的研究,硕士学位论文,西安建筑科技大学(2007)) |
| [8] | D.Sciti,F.Winterhalter,A.Bellosi,Oxidation behaviour of a pressureless sintered AIN-SiC composite,Materials sci-ence,39,6965(2004) |
| [9] | MO Dingcheng,Metallurgical Kinetics (Changsha,The Press of Central South University of Technology,1987)p.173(莫鼎成,冶金动力学(长沙,中南工业大学出版社,1987)p.173) |
| [10] | W.M.N.Nour,S.H.Kenawy,Oxidation behaviour of SiC-platelets and particulates-reinforced Al_2O_3/ZrO_2 matrix composites,Materials science,38,1673(2003) |
| [11] | Gerhard H.Schiroky,In situ measurement of silicon oxida-tion kinetics by monitoring spectrally emitted radiation,Materials science,22,3595(1987) |
| [12] | Y.J.vander Meulen,J.G.Cahill,Effeces of HCl and Cl_2 ad-ditions on silicon oxidation kinetics,Electronic Materials,3,372(1974) |
| [13] | ZHANG Wei,University Chemistry,1,(Beijing,Chemical Industry Press,2008) p.125(张炜,大学化学,(北京,化学工业出版社,2008)p.125) |
| [14] | WANG Haitang,SHI Qingliang,University Chemistry,1,(Beijing,Chemical Industry Press,2002) p.24(王海棠,时清亮,大学化学,1,(西安,西北工业大学出版社,2002)p.24) |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%