采用原位生成Si2N2O与添加β-Si3N4晶种的方法协同增韧,利用凝胶注模成型、无压烧结制备了Si3N4复相陶瓷材料,研究了协同增韧对材料力学性能和显微结构的影响.结果表明:通过添加5%(质量分数)的SiO2原位生成Si2N2O使材料的弯曲强度和断裂韧度有明显提高,分别达到359.8 MPa和4.67 MPa·m1/2,通过添加5%质量分数的β-Si3N4晶种,得到的Si3N4复相陶瓷材料中柱状β-Si3N4相生长完好、均匀分布,与板状Si2N2O结合良好.综合以上两种增韧机制使材料的力学性能进一步提高,弯曲强度为486.7 MPa,断裂韧度达到6.38 MPa·m1/2.
参考文献
| [1] | Janney MA.;Walls CA.;Nunn SD.;Ogle RJ.;Westmoreland G.;Omatete OO. .Development of low-toxicity gelcasting systems[J].Journal of the American Ceramic Society,1998(3):581-591. |
| [2] | Omatete O O et al.Gelcasting a now ceramic forming process[J].Ceramic Bulletin,1991,70(10):1641-1649. |
| [3] | Emoto H;Mitomo M;Wang C M et al.Fabrication of silicon nitride-oxynitride in-situ composites[J].European Ceramic Society,1998,18:527-533. |
| [4] | Lange F F .Fracture toughness of Si3N4 as a function of the initial or-phase content[J].American Ceramic Society,1979,62(7-8):428. |
| [5] | Tani E .Gas-pressure sintering of Si3N4 with concurrent addition of Al2O3 and 5wt% rare earth oxlde:High fracture toughness Si3N4 with fiber-lick structure[J].American Ceramic Society Bulletin,1986,65:1311. |
| [6] | Emoto H;Mitomo M .Control and characterization of abnormally grown grain in silicon nitride[J].Journal of the European Ceramic Society,1997,17:797. |
| [7] | Kanzaki S;Manuel E;Brito M .Micrestructure designing of silicon nitride[J].European Ceramic Society,1997,17:1841. |
| [8] | Hirosaki N;Okamoto Y;Munakata F et al.Effect of seeding on the thermal conductivity of self-reinforced silicon nitride[J].European Ceramic Society,1999,19:2183. |
| [9] | Sang-Hoon Rhee;Jae Do Lee;Doh-Yeon Kim .Effect of β-seed addition on the microstructural evolution of silicon nitride ceramics[J].Journal of the American Ceramic Society,2001(12):3040-3042. |
| [10] | Kriehner H P;Gruver R M .Strength-anisotropy-grain size relations in ceramic oxides[J].American Ceramic Society,1970,53(05):232. |
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%