分别以Yb2O3和MgO为添加剂,通过对原始(-Si3N4粉热处理的方法,分别在1 700℃和1 650℃的温度下,制备出了具有柱状形貌的(-Si3N4晶体颗粒.并将这2种(-Si3N4晶粒在未经酸或碱处理的情况下,作为晶种添加到原始(-Si3N4粉中,采用热压烧结工艺,以Yb2O3作为烧结添加剂,在1 800℃下制备了自增韧Si3N4陶瓷材料.研究结果表明,以Yb2O3和MgO为添加剂都可以在较低的温度下获得适合于作晶种的(-Si3N4晶体颗粒.2种晶种引入到Si3N4陶瓷中都可以有效地改善材料的断裂韧性,但晶种中的残留相对自增韧Si3N4陶瓷的高温强度产生了强烈的影响.XRD和 TEM分析结果表明,含Mg相的存在是导致Si3N4陶瓷高温强度的剧烈降低和促进晶间相析晶的主要原因.
参考文献
| [1] | Lange F F .Fracture Toughness of Si3N4 as A Function of the Initial (-phase Content[J].Journal of the American Ceramic Society,1979,62(7-8):428. |
| [2] | Tani E .Gas-pressure Sintering of Si3N4 with Concurrent Add-ition of Al2O3 and 5wt% Rare Earth Oxide: High Fracture Toughness Si3N4 with Fiber-lick Structure[J].American Ceramic Society Bulletin,1986,65:1311. |
| [3] | Kawashima .Grain Size Dependence of the Fracture Toughness of Silicon Nitride Ceramics[J].Journal of the Ceramic Society of Japan,1991,99:320. |
| [4] | Ki-Min Lee;Won-Ho Lee;Young-Hag Koh .Microstructural evolution and mechanical properties of gas-pressure-sintered Si_3N_4 with Yb_2O_3 as a sintering aid[J].Journal of Materials Research,1999(5):1904-1909. |
| [5] | Emoto H;Mitomo H .Control and Characterization of Abnor-mally Grown Grain in Silicon Nitride[J].Journal of the European Ceramic Society,1997,17:797. |
| [6] | Kanzaki S;Manuel E;Brito M .Microstructure Designing of Silicon Nitride[J].Journal of the European Ceramic Society,1997,17:1841. |
| [7] | 王向东,乔冠军,金志浩.可加工Si3N4/BN复相陶瓷的制备及性能研究[J].稀有金属材料与工程,2003(07):498-501. |
| [8] | 贾雄羽,何京彦,夏志华.SiC颗粒弥散强韧化Si3N4陶瓷刀具材料[J].稀有金属材料与工程,1999(03):182-185. |
| [9] | Hirosaki N;Okamoto Y;Munakata F et al.Effect of Seeding on the Thermal Conductivity of Self-reinforced Silicon Nitride[J].Journal of the European Ceramic Society,1999,19:2183. |
| [10] | Peillon F C;Thevenot F .Microstructure Designing of Silicon Nitride Related to Toughness[J].Journal of the European Ceramic Society,2002,22:271. |
| [11] | Lu H H;Huang J L .Microstructure in Silicon Nitride Contai-ning (-phase Seeding:Part I[J].Journal of Materials Research,1999,14(07):2966. |
| [12] | Rhee S H;Lee J D .Effect of (-seed Addition on the Microst-ructural Evolution of Silicon Nitride Ceramics[J].Journal of the American Ceramic Society,2001,84(12):3040. |
| [13] | Hirata T;Akiyama K;Morimoto T .Synthesis of (-Si3N4 Particles from (-Si3N4 Particles[J].Journal of the European Ceramic Society,2000,20:1191. |
| [14] | Hirao K .Preparation of Rod Lick (-Si3N4 Single Crystal Particles[J].Journal of the Ceramic Society of Japan,1993,101(09):1078. |
| [15] | Hirao K .Microstructure Characterization of Gas-pressure Sintered Beta-silicon Nitride Containing Large < (-silicon Nitride Seeds[J].Journal of the American Ceramic Society,1994,77:1093. |
| [16] | Gazzara C P;Messier D R .Determination of Phase Content of Si3N4 by X-Ray Diffraction Analysis[J].Ceramic Bulletin,1977,56(09):777. |
| [17] | Sarin V K .On the Alpha-to-beta Phase Transformation in Silicon Nitride[J].Materials Science and Engineering,1988,105-106:151. |
| [18] | Nishimura T.;Mitomo M. .PHASE RELATIONSHIPS IN THE SYSTEM SI3N4-SIO2-YB2O3[J].Journal of Materials Research,1995(2):240-242. |
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%