采用激光区熔高温度梯度快速定向凝固技术从熔体中直接制备Al2O3/Y3Al5O12(YAG)共晶自生复合陶瓷,以研究其在超高温度梯度(1.0×106 K/m)下的快速凝固组织特征及与激光工艺参数的关系,并对其力学性质进行分析.研究结果表明:凝固组织强烈地受激光扫描速度与功率密度的影响,当二者匹配时,Al2O3相和Y3Al5O12(YAG)相呈现均匀一致,连续分布的层状耦合共晶结构,共晶间距细小(1～2 μm),且随扫描速度的增大逐渐减小;所制备的Al2O3/Y3Al5O12(YAG)共晶陶瓷硬度高达19.5 GPa,断裂韧性达到3.6 MPa·m1/2.
参考文献
| [1] | 张军;李建国;傅恒志 .单晶高温合金高梯度定向凝固特性的比较研究[J].金属学报,1999,35(zk):220-224. |
| [2] | Waku Y.;Ohtsubo H.;Mitani A.;Shimizu K.;Nakagawa N. .Fracture and deformation behaviour of melt growth composites at very high temperatures[J].Journal of Materials Science,2001(7):1585-1594. |
| [3] | 傅恒志,魏炳波,郭景杰.凝固科学技术与材料[J].中国工程科学,2003(08):1-15. |
| [4] | WAKU Y;NAKAGAWA N;WAKAMOTO T et al.A ductile ceramic eutectic composite with high strength at 1873K[J].Nature,1997,389(6646):49-52. |
| [5] | 陈昌明 .LaB6-ZrB2共晶自生复合材料的组织与性能[D].西安:西北工业大学,1997. |
| [6] | 杨森,黄卫东,刘文今,苏云鹏,周尧和.激光超高温度梯度快速定向凝固研究[J].中国激光,2002(05):475-479. |
| [7] | 张军,苏海军,刘林.Al2O3/YAG共晶自生复合陶瓷的激光熔凝实验研究[J].航空材料学报,2003(z1):171-174. |
| [8] | Colleen S.Frazer;Elizabeth C.Dickey;Ali Sayir .Crystallographic texture and orientation variants in Al_2O-3-Y_3Al_5O_12 directionally solidified eutectic crystals[J].Journal of Crystal Growth,2001(1/2):187-195. |
| [9] | KURZ W;FISHER D J.Fundamentals of Solidification[M].Switzerland:Trans Tech Publications,1984 |
| [10] | Park DY.;Yang JM. .Effect of the microstructure on the mechanical properties of a directionally solidified Y3Al5O12/Al2O3 eutectic fiber[J].Journal of Materials Science,2001(23):5593-5601. |
| [11] | WAKU Y;NAKAGAWA N;SHIMIZU K et al.Ceramic composite material and porous ceramic material[P].US 5981415,1999-11-09. |
| [12] | J.H.Lee;A.Yoshikawa;H.Kaiden .Microstructure of Y_2O_3 doped Al_2O_3/ZrO_2 eutectic fibers grown by the micro-pulling down method[J].Journal of Crystal Growth,2001(1/2):179-185. |
| [13] | S. Ochiai;T. Ueda;K. Sato .Deformation and fracture behavior of an Al_2O_3/YAG composite from room temperature to 2023 K[J].Composites science and technology,2001(14):2117-2128. |
| [14] | J.M. Calderon-Moreno;M. Yoshimura .Al_2O_3-Y_3Al_5O_(12)(YAG)-ZrO_2 ternary composite rapidly solidified from the eutectic melt[J].Journal of the European Ceramic Society,2005(8):1365-1368. |
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%