SiC-YAG(Y3Al5O12) ceramic composite powders were prepared by co-precipitation coating method. Mechanism of co-precipitation coating of SiC powders with Y3+ and Al3+ precursors was investigated. If the concentration of [OH-] ion in the solution is controlled within the range between critical values for heterogeneous nucleation and homogeneous nucleation, Y3+ and Al3+ precipitation precursors can be coated on the surface of SiC particles. Y3+ and Al3+ precipitation precursors transform into YAG phase after calcining at 1000 ℃ without the formation of YAM and YAP phases. The formation temperature of YAG phase is about 600 ℃ lower than that of conventional powder mixing method. The effect of pH value of the solution and precipitant titration rate on coating quality of SiC-YAG composite powders was also studied. The results show that co-precipitation coating can be realized at a final pH of 9 and a precipitant titration rate of 5 ml·min-1.
参考文献
| [1] | Rodeghiero E D;Moore B C;Wolkenberg B S et al.Sol-gel synthesis of ceramic matrix composites[J].Materials Science and Engineering,1998,A244:11. |
| [2] | Wang H Z;Gao L;Guo J K .The effect of nanoscale SiC particles on the microstructure of Al2O3 ceramics[J].Ceramics International,2000,26:391. |
| [3] | Ru Hongqiang,Gong Ganlei,Zhang Ning,Wang Lei,QIU Guanming,SUN Xudong.Physical Properties of SiCp/Sialon Composites with 4% Y2O3[J].稀土学报（英文版）,2004(z3):96-100. |
| [4] | Tsuge A;Inoue H;Kasori M .Effect of raw material on AlN powder synthesis from Al2O3 carbothermal reduction[J].Journal of Materials Science,1990,25(09):2359. |
| [5] | Samanta A K;Dhargupta K K;De A K et al.SiC-YAG sintered composites from hydroxy hydrogel powder precursors[J].Ceramics International,2000,26:831. |
| [6] | Seung K L;Chong H K .Effects of α-SiC versus β-SiC starting powders on microstructure and fracture toughness of SiC sintered with Al2O3-Y2O3 additives[J].Journal of the American Ceramic Society,1994,77(06):1655. |
| [7] | J.Tirlocq;F.Cambier .Thermodynamics of the Al-C-O system and properties of SiC-AlN-Al2OC composites[J].Journal of the European Ceramic Society,1999(16):2781-2787. |
| [8] | Zhejiang University.Silicate Physical Chemistry[M].北京:中国建筑工业出版社,1980 |
| [9] | Jean JH.;Wang HR. .Dispersion of aqueous barium titanate suspensions with ammonium salt of poly(methacrylic acid)[J].Journal of the American Ceramic Society,1998(6):1589-1599. |
| [10] | Jean J H;Wang H R .Stabilization of aqueous BaTiO3 suspensions with ammonium salt of poly(acrylic acid) at various pH values[J].Journal of Materials Research,1998,13(08):2245. |
| [11] | Samanta A K;Dhargupta K K;Ghatak S .Decomposition reactions in the SiC-Al-Y-O system during gas pressure sintering[J].Ceramics International,2001,27:123. |
| [12] | Li J G .Crystal phase and sinter ability of wet-chemically derived YAG powders[J].Journal of the Ceramic Society of Japan,2000,108(05):439. |
| [13] | Wen L;Sun X D;Ma W M .Preparing YAG clarity ceramic by solid reaction method[J].Silicates Industries,2003,31:819. |
| [14] | Dongsheng R.Silicate Physical Chemistry[M].北京:冶金工业出版社,1980 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%