采用两步法制备硼化钨陶瓷,首先将硼粉与钨粉按一定比例混合,在高温下合成硼化钨粉体,再以此为原料采用冷压和高温烧结制备硼化钨陶瓷.研究硼钨比例对合成粉体物相组成的影响,以及烧结温度对硼化钨陶瓷微观结构及力学性能的影响.研究结果表明:硼钨摩尔比为2.5时,可以得到纯度较高的WB2粉体.随着烧结温度的升高,WB2陶瓷的显气孔率减小,相对密度增加,材料的抗弯强度与显微硬度明显增大,当烧结温度达到1800℃时,WB2陶瓷的开口孔隙率为5.2％,相对密度86.0％,抗弯强度72MPa,显微硬度2088.5MPa.WB2陶瓷的断裂行为也从沿晶断裂转变为穿晶断裂模式.
参考文献
| [1] | ZHANG G J,ZOU J,NI D W,et al.Boride ceramics:densification,microstructure tailoring and properties improvement.Journal of Inorganic Materials,2012,27(3):225-233. |
| [2] | MISHRA S K,DAS S,DAS S K,et al.Sintering studies on ultrafine ZrB2 powder produced by a self-propagating high-temperature synthesis process.J.Mater.Res.,2000,15(11):2499-2504. |
| [3] | LI B,ZHOU F,QIU Z X.Preparation of TiB2 coated cathode of Al electrolysis.J.Mater.Sci.Technol.,2001,17(S1):171-173. |
| [4] | NI D W,ZHANG G J,KAN Y M,et al.Hot pressed HfB2 and HfB2-20vol％ SiC ceramics based on HfB2 powder synthesized by borothermal reduction of HfO2.Int.J.Appl.Ceram.Technol.,2010,7(6):830-836. |
| [5] | NAGAMATSU J,NAKAGAWA N,MURANAKA T,et al.Superconductivity at 39 K in magnesium diboride.Nature,2001,410(6824):63-64. |
| [6] | CHEN X Q,FU C L,KRCMAR M,et al.Electronic and structural origin of ultra-incompressibility of 5d transition-metal diborides MB2 (M =W,Re,Os).Phy.Rev.Lett.,2008,100(19):6403-6407. |
| [7] | COSKU S,OVECOGLU M L.Room-temperature mechanochemical synthesis of W2B5 powder.Metall.Mater.Trans.B,2013,44(4):1805-1813. |
| [8] | FROTSCHER M,KLEIN W,BAUER J,et al.M2B5 or M2B4? A reinvestigation of the Mo/B and W/B system.Anorg.Allg.Chem.,2007,633(15):2626-2630. |
| [9] | OTANI S,OHASHI H,ISHIZAWA Y.Lattice constants and non-stoichiometry of WB2.x.J.Alloys Compd.,1995,221:8-10. |
| [10] | WOODS H P,WAWNER F E JR,FOX B G.Tungsten diboride:preparation and structure.Science,1966,151(3706):75. |
| [11] | ARMAS B,TROMBE F.Chemical vapour deposition of molybdenum and tungsten borides by thermal decomposition of gaseous mixtures of halide on a solar "front chaud".Sol.Energy,1973,15(1):67-73. |
| [12] | ITOH H,MATSUDAIRA T,NAKA S,et al.Formation process of tungsten borides by solid state reaction between tungsten and amorphous boron.J.Mater.Sci.,1987,22(8):2811-2815. |
| [13] | OTANI S,ISHIZAWA Y.Preparation of WB2-xsingle crystals by the floating zone method.J.Cryst.Growth,1995,154(1/2):81-84. |
| [14] | MALYSHEV V,GAB A,SHAKHNIN D,et al.High temperature electrochemical synthesis of molybdenum,tungsten and chromium borides from halide-oxide melts.Rev.Roum.Chim.,2010,55(4):233-238. |
| [15] | YAZICI S,DERIN B.Production of tungsten boride from CaWO4 by self-propagating high-temperature synthesis followed by HCl leaching.Int.J.Refract.Met.H.,2011,29(1):90-95. |
| [16] | WANG D Y,LI X,WANG Y X.First-principles investigation of hexagonal WB2 surfaces.J.Phys.Soc.Jpn.,2012,81(4):044712-1-7. |
| [17] | SHIBUYA M,OHYANAGI M.Effect of nickel boride additive on simultaneous densification and phase decomposition of TiB2-WB2 solid solutions by pressureless sintering using induction heating.J.Eur.Ceram.Soc.,2007,27(1):301-306. |
| [18] | SHIBUYA M,KAWATA M,OHYANAGI M.Titanium diboridetungsten diboride solid solutions formed by induction-field-activated combustion synthesis.J.Am.Ceram.Soc.,2003,86(4):706-710. |
| [19] | TELLE R,FENDLER E,PETZOW G.The quasi-binary systems CrB2-TiB2,CrB2-WB2 and TiB2-WB2.J.Hard.Mater,1992,3:211-224. |
| [20] | KAGA H,HEIAN E M,MUNIR Z A,et al.Synthesis of hard materials by field activation:the synthesis of solid solutions and composites in the TiB2-WB2-CrB2 system.J.Am.Ceram.Soc.,2001,84(12):2764-2770. |
| [21] | MAXIMENKO A L,OLEVSKY E A.Effective diffusion coefficients in solid-state sintering.Acta Mater.,2004,52(10):2953-2963. |
| [22] | ZHAO L Y,JIA D C,DUAN X M,et al.Pressureless sintering of ZrC-based ceramics by enhancing powders sinterability.Int.J.Refract.Met.H.,2011,29(4):516-521. |
| [23] | YOSHIDA H,HIRAGA K,YAMAMOTO T.Densification behavior of Ti-doped polycrystalline alumina in a nitrogenhydrogen atmosphere.Mater.Trans.,2009,50(5):1032-1036. |
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%