分别以TiH2,ZrH2为原料,结合原位反应与脉冲电流辅助烧结制备了TiB2-SiC及ZrB2-SiC复相陶瓷.研究发现,所制备的复相陶瓷表现出一定的织构化现象,TiB2及ZrB2晶粒在反应烧结过程中其(001)面沿垂直压力和电流方向生长.金属氢化物粉体的粒径大小对复相陶瓷的致密化及微结构有较大影响:粒径越小越有利于陶瓷的致密化和硼化物晶粒的定向生长.由于金属硼化物的定向,复相陶瓷的机械性能表现出各向异性.TiB2-SiC复相陶瓷具有较高的断裂韧性,最高可达7.3 MPa·m1/2,而ZrB2-SiC复相陶瓷具有更高的抗弯强度(937 MPa).
参考文献
| [1] | William G. Fahrenholtz;Gregory E. Hilmas;Inna G. Talmy;James A. Zaykoski .Refractory Diborides of Zirconium and Hafnium[J].Journal of the American Ceramic Society,2007(5):1347-1364. |
| [2] | Shu-Qi Guo .Densification of ZrB_2-based composites and their mechanical and physical properties: A review[J].Journal of the European Ceramic Society,2009(6):995-1011. |
| [3] | Zhang G.J.;Deng Z.Y. .Reactive Hot Pressing of ZrB_2-SiC Composites[J].Journal of the American Ceramic Society,2000(9):2330-2332. |
| [4] | Chamberlain AL;Fahrenholtz WG;Hilmas GE .Low-temperature densification of zirconium diboride ceramics by reactive hot pressing[J].Journal of the American Ceramic Society,2006(12):3638-3645. |
| [5] | Sumin Zhu;William G. Fahrenholtz;Gregory E. Hilmas .Influence of silicon carbide particle size on the microstructure and mechanical properties of zirconium diboride-silicon carbide ceramics[J].Journal of the European Ceramic Society,2007(1):2077-2083. |
| [6] | Yuan Zhao;Lian-Jun Wang;Guo-Jun Zhang .Preparation and Microstructure of a ZrB_2-SiC Composite Fabricated by the Spark Plasma Sintering-Reactive Synthesis (SPS-RS) Method[J].Journal of the American Ceramic Society,2007(12):4040-4042. |
| [7] | Songlin Ran;Omer Van der Biest;Jef Vleugels .ZrB_2—SiC composites prepared by reactive pulsed electric current sintering[J].Journal of the European Ceramic Society,2010(12):2633-2642. |
| [8] | Adam L. Chamberlain;William G. Fahrenholtz;Gregory E. Hilmas .Reactive hot pressing of zirconium diboride[J].Journal of the European Ceramic Society,2009(16):3401-3408. |
| [9] | Jensen MS;Einarsrud MA;Grande T .Preferential grain orientation in hot pressed TiB2[J].Journal of the American Ceramic Society,2007(4):1339-1341. |
| [10] | De-Wei Ni;Guo-Jun Zhang;Yan-Mei Kan .Highly textured ZrB_2-based ultrahigh temperature ceramics via strong magnetic field alignment[J].Scripta materialia,2009(8):615-618. |
| [11] | Songlin Ran;Omer Van der Biest;Jef Vleugels .In situ platelet-toughened TiB_2-SiC composites prepared by reactive pulsed electric current sintering[J].Scripta materialia,2011(12):1145-1148. |
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%