以Si3N4和BN粉末为原料,Si3N4-BN复合粉末中BN的体积分数分别选定为10%、20和30%,采用质量分数为2%的Al2O3和6%的Y2O3作为烧结助剂,分别在1 500、1 600和1 650 ℃,压力50 MPa,保温5 min的条件下,采用放电等离子体烧结法制备了致密Si3N4-BN复合陶瓷.XRD结果和SEM分析表明:当煅烧温度为1 650℃时,复合陶瓷中的α-Si3N4已完全转变为p-Si3N4;BN的加入抑制了复合陶瓷中Si3N4晶粒的生长而使结构细化;复合陶瓷的维氏硬度和断裂韧性随BN含量的增加而逐渐降低.
参考文献
| [1] | M.W. Cho;D.W. Kim;W.S. Cho .Analysis of micro-machining characteristics of Si_3N_4-hBN composites[J].Journal of the European Ceramic Society,2007(2/3):1259-1265. |
| [2] | Xiaodong Li;Linhua Zou;Hai Ni;Anthony P. Reynolds;Chang-an Wang;Yong Huang .Micro/nanoscale mechanical characterization and in situ observation of cracking of laminated Si3N4/BN composites[J].Materials science & engineering, C. Biomimetic and supramolecular systems,2008(8):1501-1508. |
| [3] | Lian Gao;Xihai Jin;Jingguo Li;Yaogang Li;Jing Sun .BN/Si_3N_4 nanocomposite with high strength and good machinability[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):145-148. |
| [4] | 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. |
| [5] | 张强,沈卫平,顾淑媛.可加工氮化硅/氮化硼复相陶瓷的制备[J].硅酸盐学报,2007(03):337-341. |
| [6] | Cuiwei Li;Chang-an Wang;Yong Huang;Qingfeng Zan;Shike Zhao .Effects of sintering aids on the microstructure and mechanical properties of laminated Si_3N_4/BN ceramics[J].Materials Letters,2003(22/23):3473-3478. |
| [7] | T. Nishimura;M. Mitomo;H. Hirotsuru;M. Kawahara .Fabrication of silicon nitride nano-ceramics by spark plasma sintering[J].Journal of Materials Science Letters,1995(15):1046-1047. |
| [8] | 高濂;宫本大树 .放电等离子体烧结技术[J].无机材料学报,1997,12(02):129-133. |
| [9] | Anstis G R;Chantikul P;Lawn B R et al.A critical evaluation of indentation techniques for measuring fracture toughness(Ⅰ):direct crack measurements[J].Journal of the American Ceramic Society,1981,64(09):533-538. |
| [10] | Takafumi Kusunose;Tohru Sekino;Yong Ho Choa;Koichi Niihara .Fabrication and microstructure of silicon nitride/boron nitride nanocomposites[J].Journal of the American Ceramic Society,2002(11):2678-2688. |
| [11] | Becher PF.;Plucknett KP.;Alexander KB.;Hsueh CH.;Lin HT. Waters SB.;Westmoreland CG.;Kang ES.;Hirao K.;Brito ME.;Sun EY. .Microstructural design of silicon nitride with improved fracture toughness: I, effects of grain shape and size[J].Journal of the American Ceramic Society,1998(11):2821-2830. |
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%