以Si粉(w(Si)=99%)、Mo粉(w(Mo)=99%)和六方BN粉(w(BN)≥98%)为原料,Fe2O3(w(Fe)≥69.8%)为烧结助剂,高纯氮气(ψ(N2)=99.99%)为反应气体,采用反应烧结法于1 450 ℃氮气气氛下保温5 h原位合成了MoSi2-Si3N4-BN复合材料.研究了Mo粉加入量(W)为:0、5%、10%、15%、20%、30%时对材料的显气孔率、体积密度和抗折强度的影响,利用XRD研究了Mo粉不同加入量下复合材料的物相组成,并利用SEM对材料表面和断面形貌进行了观察,同时探讨了Mo5Si3的形成机理.结果表明:随着原料中Mo粉加入量的增加,所制备的复合材料显气孔率增大,体积密度和抗折强度减小.材料中含有α-Si3N4、β-Si3N4、BN、MoSi2和少量的Mo5Si3相.原位生成的MoSi2及少量的Mo5Si3均匀地分散在材料中,其晶粒尺寸为2～3 μm.随着原料中Mo粉加入量增加,Mo5Si3的生成量越来越多;当Mo粉加入量为30%时,Mo在材料中主要以Mo5Si3的形式存在.Mo5Si3的生成机理为MoSi2失去Si转化而成.
参考文献
| [1] | Takafumi Kusunose;Tohru Sekino;Yong-Ho Choa;Koichi Niihara .Machinability of silicon nitride/boron nitride nanocomposites[J].Journal of the American Ceramic Society,2002(11):2689-2695. |
| [2] | 王思青,张长瑞,王圣威,齐共金,曹峰,胡海峰,姜勇刚.Si3N4基复相陶瓷材料的制备及力学性能[J].材料导报,2006(z1):459-461. |
| [3] | John J.Petrovic;Maria I.Pena;Ivar E.Reimanis .Mechanical behavior of mosi_2 reinforced-Si_3N_4 matrix composites[J].Journal of the American Ceramic Society,1997(12):3070-3076. |
| [4] | Moulson A J .Review reaction-bonded silicon nitride:its formation and properties[J].Journal of Materials Science,1979,14:1017-1051. |
| [5] | Zhang BR.;Marino F. .REACTION-BONDING PREPARATION OF SI3N4/MOSI2 AND SI3N4/WSI2 COMPOSITES FROM ELEMENTAL POWDERS[J].Journal of the American Ceramic Society,1997(1):269-272. |
| [6] | Petrovic J J;Pena M I;Kung H H.Fabrication and microstructures[M]. |
| [7] | 叶乃清,曾照强,胡晓清,苗赫濯.BN-YAION复合陶瓷的烧结行为[J].硅酸盐学报,1998(02):268-272. |
| [8] | Zhang B R;Marino F;Sglavo V M .In-situ formation and high-temperature reinforcing effect of MoSi2 and WSi2 on reaction-bonded Si3N4[J].Materials Science and Engineering,1997,A239-240:503-506. |
| [9] | Schuster J C .Silicon nitride-metai joints:phase equilibria in the systems Si3Ni4-Cr,Mo,W and Re[J].Journal of Materials Science,1988,23:2792-2796. |
| [10] | Cherniack G B;Elliot A G .High-temperature behavior of MoSi2 and Mo5Si3[J].Journal of the American Ceramic Society,1964,47(03):136-141. |
| [11] | Klemm H.;Schubert C.;Hermel W.;Tangermann K. .INFLUENCE OF MOLYBDENUM SILICIDE ADDITIONS ON HIGH-TEMPERATURE OXIDATION RESISTANCE OF SILICON NITRIDE MATERIALS[J].Journal of the American Ceramic Society,1996(9):2429-2435. |
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%