采用自蔓延高温合成(SHS),在高压氮气中成功地合成了β-Si3N4棒晶,研究了添加不同量Y2O3对自蔓延燃烧合成β-Si3N4棒晶长径比的影响.结果表明,Y2Os添加量有一个最佳范围,当Y2O3的添加量在2wt%~5wt%时,棒晶生长均匀,长径比约为8.通过铜坩埚吸热淬火的方法,观察到β-Si3N4棒晶不同生长阶段的显微形貌,从而推测其生长机理为VLS和VS两种机理协同作用的结果.本文对β-Si3N4棒晶生长的反应历程也进行了阐述.
参考文献
[1] | Hoffmann M, Jand Petzow G. "Microstructure Design of Si3N4 Base Ceramics"; in silicon nitride ceramics scientific and technology advances. Edited by I-Wei Chen,Paul F.Becher,G.Petzow,Tung sheng Yen. Materials Research Society, Pittsbugh, PA, 1993. 3-14. |
[2] | Becher P F. J. Am. Ceram. Soc., 1991, 74 (2): 255-269. |
[3] | Hirao Kiyoshi, Nagarka Takaaki, Manuel E Brito, et al. J. Am. Germ. Soc., 1994, 77 (7): 1857-1862. |
[4] | Hirao Kiyoshi, Masayshi Manuel E. Brito Shuzo kanzaki. J. Am. Ceram. Soc., 1995, 78 (6):1687-1690. |
[5] | Hirao Kiyoshi, Akira Tsuge, Manuel E Brito, et al. J. Ceram. Soc. Jpn., 1993, 101 (9): 1078-1080. |
[6] | Wang Ming-Jong, Wada Harue. J. Mater. Sci., 1990, 25: 1690-1698. |
[7] | Peelamedu D ramesh. Rainer Oberacker, Hoffmann Michael J. J. Am. Ceramic. Soc., 1999, 82 (6):1608-1610. |
[8] | Merzhanov A G. Self-propagating high temperature synthesis: Twenty years of search and findings [A]. In Combustion and Plasma synthesis of High-temperature Materials, ed. Z.A.Munir and J.B.Holt.VCH Publisher, New York., 1990. 1-53. |
[9] | Babini G N, Bellosi A, Vincenzini P. Mater. Chem. Phys., 1984, 11: 365-400. |
[10] | Hardie K H Jack. Nature, 1957, 180: 332-333. |
[11] | Hoffmann M J. "Tailoring of Mechanical Processing of Si3N4 Ceramics, "Ed.by M.J.Hoffmann and G.Petzow,Kluwer Academic Publishers,The Netherlands., 1994. 59-72. |
[12] | Levitt A P, whisker technology .John Wiley & Sons. Inc.,New York, 1970. 58-65. |
[13] | Mikito Kitayama, Hirao Kiyoshi, et al. J. Ceram. Soc. Jpn., 1999, 107 (11): 995-1000. |
[14] | Hisayuki Suemasu, Mamorru Mitomo. J. Am. Ceram. Soc., 1997, 80 (3): 615-620. |
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%