真空无压浸渗法制备铁基TiC-Al_2O_3复合辊
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摘要
采用凝胶离心成形工艺,以蔗糖为造孔剂,经过真空脱胶烧结,制备了孔隙率高达71.12%的Ti-Al_2O_3管状多孔骨架,并采用预制的Fe合金熔体真空无压浸渗,浸渗温度1 400℃,保温30 min,最终制备出芯部为铁基合金,表面为Fe-TiC-Al_2O_3的小型复合辊。采用扫描电子显微镜、X射线衍射仪对复合辊表面层的组织结构和相组成进行测试和分析,并测定了复合辊的硬度、抗热震性及耐磨性。结果表明:制备的复合辊芯部与表面层结合良好,没有出现开裂现象;浸渗过程Ti与C反应生成TiC,TiC围绕Al_2O_3颗粒生成,形成环形相;表面层硬度达到65 HRC,800℃热震10次未出现明显裂纹,热震20次结合面附近表面层中出现裂纹,并沿着结合面扩展;在磨损试验中,Al_2O_3颗粒与基体结合良好,没有出现剥落现象。
Ti-Al_2O_3 tubular porous skeleton with porosity as high as 71.12% was prepared by gel centrifugal forming process and vacuum sintering using sucrose as pore-forming agent. The prefabricated Fe alloy melt was vacuum pressureless impregnated at 1 400 ℃ for 30 min. Finally,a small composite roller with iron-based alloy core and Fe-TiC-Al_2O_3 surface was prepared. The microstructure and phase composition of the surface layer of the composite roller were tested and analyzed by scanning electron microscope and X-ray diffractometer,and the hardness,thermal shock resistance and wear resistance of the composite roller were measured. The results show that the core and surface layer of the prepared composite roller are well bonded without cracking. TiC is produced by reaction between Ti and C during infiltration. TiC is formed around Al_2O_3 particles to form an annular phase. The hardness of the surface layer reaches 65 HRC,and no obvious cracks appear after 10 thermal shocks at 800 ℃,while cracks appear in the surface layer near the bonding surface after 20 thermal shocks and spread along the bonding surface. In the wear test,Al_2O_3 particles are well bonded to the matrix without peeling off.
Ti-Al_2O_3 tubular porous skeleton with porosity as high as 71.12% was prepared by gel centrifugal forming process and vacuum sintering using sucrose as pore-forming agent. The prefabricated Fe alloy melt was vacuum pressureless impregnated at 1 400 ℃ for 30 min. Finally,a small composite roller with iron-based alloy core and Fe-TiC-Al_2O_3 surface was prepared. The microstructure and phase composition of the surface layer of the composite roller were tested and analyzed by scanning electron microscope and X-ray diffractometer,and the hardness,thermal shock resistance and wear resistance of the composite roller were measured. The results show that the core and surface layer of the prepared composite roller are well bonded without cracking. TiC is produced by reaction between Ti and C during infiltration. TiC is formed around Al_2O_3 particles to form an annular phase. The hardness of the surface layer reaches 65 HRC,and no obvious cracks appear after 10 thermal shocks at 800 ℃,while cracks appear in the surface layer near the bonding surface after 20 thermal shocks and spread along the bonding surface. In the wear test,Al_2O_3 particles are well bonded to the matrix without peeling off.
引文
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[3] Yasir L,ZHANG C,WANG W,et al. Wear behaviors of Febased amorphous composite coatings reinforced by Al2O3particles in air and in NaCl solution[J]. Materials&Design,2015,88(25):207.
[4] NIU L B,Hojamberdiev M,XU Y H. Preparation of in situformed WC/Fe composite on gray cast iron substrate by a centrifugal casting process[J]. Journal of Materials Processing Technology,2010,210(14):1986.
[5] 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.
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[8]兖利鹏,文秀海,原国森.粉末冶金制备SiC/6061Al复合材料的显微组织和力学性能研究[J].粉末冶金工业,2017,27(3):53.
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