采用放电等离子烧结(SPS)方法制备了金刚石颗粒(平均粒径为12 μm、25 μm 及50 μm)以20 %的体积比弥散WC-10 wt%Co硬质合金的致密复合物,为防止金刚石颗粒的氧化和石墨化,用高温化学反应方法在其表面生成了一层牢固结合的纳米尺寸的碳化硅保护膜.所得烧结体的相对密度均可达到98%.弥散金刚石颗粒基本保持了基体的高硬度,但是使复合物的断裂韧性得到了显著提高,金刚石粒度为50 μm时,韧性高达17.8 MPa*m1/2.沿金刚石颗粒周围可以清晰地观察到裂纹偏转及停止现象.金刚石粒度的变化对力学性能的影响不很明显.
参考文献
| [1] | Fan W D, Jagannaham K, Narayan J. Applications of Diamond Films and Related Materials [A]. In: Feldman A, Tzeng Y, Yarbrough W A, et al, eds.Third International Conference [C]. Gaithersburg:NIST Special Publication 885, 1995.533-536. |
| [2] | Chuprina V G, Shalya I M, Umanskii V P. Oxidation of Cr-Ni coatings On Diamond [J]. Powder Metallurgy and Metal Ceramics, 1993, 32(7): 613-617. |
| [3] | Williams C T, Demetry C, Li R,et al. Structure and strength of interfaces in titanium-coated diamond-glass composites [J]. Ceramic Engineering and Science Proceedings, 2000,21(3): 697-704. |
| [4] | 王明智,王艳辉,关长斌,等. 金刚石表面的Ti、Mo、W镀层及界面反应对抗氧化性能的影响 [J].复合材料学报,1996,13(2):48-52 . |
| [5] | Kume S, Suznki K, Yoshida H, et al. Ultrahigh pressure hot isostatic pressing of TiN-coated diamond/TiN/alumina Composites under thermodynamically unstable condition for diamonds [J]. International Journal of Refractory Metals & Hard Materials, 2001,19(1):17-22. |
| [6] | Wentorf R H, Devries R C, Bundy F P. Sintered superhard materials [J]. Science, 1980, 208(4446): 873-880. |
| [7] | Miyamoto Y, Kashiwagi T, Moriguchi H, et al. Nano-SiC coated diamond [J]. Tech & Mat Now, Ceramics, 2002, 37(3): 188-190. |
| [8] | Jain M, Sadangi R K, Cannon W R,et al. Processing of functionally graded WC/Co/diamond nanocomposites [J]. Scripta Mater, 2001,44(8-9): 2099-2103. |
| [9] | Katzman H, Libby L L. Sintered diamond compacts with a cobalt binder [J]. Science, 1971, 172(3988):1132-1134. |
| [10] | Tanaka K. Elastic/plastic indentation hardness and indentation fracture toughness: the inclusion core model [J]. J Mater Sci. 1987, 22(4):1501-1508. |
| [11] | 于伯龄,姜胶东. 实用热分析 [M].北京:纺织工业出版社,1990.56-57. |
| [12] | Amithaghi S, Reehal H S, Wood R J K, et al. Diamond coatings on tungsten carbide and their erosive wear properties [J]. Surface and Coatings Technology, 2001,135(2-3): 126-138. |
| [13] | Torres Y, Casellas D, Anglada M, et al. Fracture toughness evaluation of hard metals:Influence of testing procedure [J]. International Journal of Refractory Metals & Hard Materials, 2001,19(1): 27-34. |
| [14] | Faber K T, Evans A G. Crack deflection process-I Theory [J]. Acta Metall, 1983, 31(4): 565-576. |
| [15] | 刘伯威,潘进,樊毅,等. SiC颗粒强韧化MoSi2复合材料 [J].复合材料学报,2002,19(1):59-63. |
| [16] | Faber K T, Evans A G. Crack deflection process-II Experiment [J]. Acta Metallurgica, 1983, 31(4): 577-84. |
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