研究了一种Ti诱导反应熔体无压浸渗制备复合材料的方法：通过凝胶注模成型工艺,以蔗糖为造孔剂制备了多孔Ti-WC陶瓷骨架预制体,真空状态下,在1370℃以Fe-Cr-C合金熔体无压浸渗该预制体,经过原位反应制备了（W,Ti）C/Fe复合材料。利用SEM-EDS、XRD对复合材料的组织结构、元素组成及相组成进行了测试和分析。采用旋转圆盘式摩擦试验机以SiC砂浆为磨料研究了（W,Ti）C/Fe复合材料的耐磨性。结果表明：在浸渗过程中骨架中的Ti元素的溶解析出与C元素的原位反应促进了浸渗过程的进行,在1370℃保温1h,金属液即渗透整个多孔骨架,并且在浸渗过程中仍然维持着骨架的形状,浸渗过程中Ti-C-WC原位反应生成具有芯-壳结构的中间富Ti、边缘富W的（W,Ti）C增强相。摩擦磨损实验结果表明,（W,Ti）C/Fe复合材料具有优异的抗磨粒磨损性能,其耐磨性优于工业用耐磨铸铁。
As a new kind of method to prepare composites,pressureless Ti-activated reactive melt infiltration was investigated.The Ti-WC porous ceramics skeleton preform was prepared by gelcasting using sugar as pore former.Under vacuum condition,the Ti-WC porous ceramics skeleton preform was infiltrated by Fe-Cr-C alloy melt with in-situ reaction to prepare the（W,Ti）C/Fe composites.The microstructures,element composition and phase analysis were investigated by using SEM-EDS and XRD.And the wear resistance was studied using a rotating disc rig with SiC mortar as the abrasive material.The results show that the infiltration process is accelerated by the dissolution and precipitation of titanium and the in-situ reaction between titanium and carbon.At 1370 ℃ for 1 h,the porous ceramics skeleton is permeated by the melt,and the space structure has not been changed in the infiltration process.The reinforced phase（W,Ti）C which has a concentration gradient of Ti and W from core to the periphery is produced by in-situ reaction of Ti-C-WC.As the result of the wear testing shown,（W,Ti）C/Fe composites have excellent abrasive wear resisitance,which is better than that of the wear resistant cast iron commonly used in industry.
参考文献
| [1] | Bahraini M, Schlenther E, Kriegesmann J. Influence of atmosphere and carbon contamination on activated pressureless infiltration of alumina - steel composites[J]. Composites Part A, 2010, 41(10): 1511-1515. |
| [2] | WittigD, Glauche A, Aneziris C G, et al. Activated pressureless melt infiltration of zirconia - based metal matrix composites[J]. Materials Science and Engineering A, 2008, 488(1/2): 580-585. |
| [3] | Bahraini M, Minghetti T, Zoellig M, et al. Activated pressureless infiltration of metal - matrix composites with gradedaetivator content [J]. Composites Part A, 2009, 40(10) : 1566-1572. |
| [4] | 张卫方,韩杰才,陈贵清,等.致密TiC-A12O3-Fe金属陶瓷的自蔓延高温合成[J].复合材料学报,2000,17(3):51-54. |
| [5] | 杨光义,高明霞,潘颐.熔渗法制备SiC/Fe2Si2复合材料显微结构和性能[J].复合材料学报,2005,22(1):41-46. |
| [6] | 姚秀荣,韩杰才.刘兆晶.Fe-C-Cr-V合金体系中球状VC颗粒原位生成及长大过程[J].复合材料学报,2005,22(6):59-65. |
| [7] | Dey A, Kayal N, Chakrabarti O, et al. Preparation of porous SiC ceramics by an infiltration technique [J]. Ceramics International, 2011, 37(1) : 223-230. |
| [8] | Zhang D, Shen P, Shi X L, et ah Wetting and evaporation behaviors of molten Mg on partially oxidized SiC substrates [J]. Applied Surface Science, 2010, 256(23): 7043-7047. |
| [9] | Zhang D, Shen P, Shi X L, et al. Wetting of B4C, TiC and graphite substrates by molten Mg [J]. Materials Chemistry and Physics, 2011, 130(1/2): 665-671. |
| [10] | Zahedi A M, Rezaie H R, Javadpour J, et al. Processing and impact behavior of Al/SiCp composites fabricated by the pressureless melt infiltration method [J]. Ceramics International, 2009, 35(5): 1919-1926. |
| [11] | Lemster K, Graule T, Minghetti T, et al. Mechanical and machining properties of X38CrMoV5 - 1/A1203 metal matrix composites and components [J]. Materials Science andEngineering A, 2006, 420(1/2): 296-305. |
| [12] | Lemster K, Delporte M, Graule T, et al. Activation of alumina foams for fabricating MMCs by pressureless infiltration [J]. Ceramics International, 2007, 33(7):1179- 1185. |
| [13] | Lemster K, Graule T, Kuebler J. Processing and microstructure of metal matrix composites prepared by pressureless Ti-activated infiltration using Fe-base and Ni base alloys [J]. Materials Science and Engineering A, 2005, 393(1/2): 229-238. |
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