【作者】 王宝臣；

【导师】 张伟强；

【作者基本信息】 辽宁工程技术大学 ， 材料学， 2006， 硕士

【摘要】 采用电磁离心铸造工艺制备了两种不同粒度的SiC颗粒增强Al基功能梯度复合材料,制备了粒度相同的密度大于Al的SiCp与密度小于Al的B4Cp同时增强Al基功能梯度复合材料,测定了不同磁场强度下各种颗粒在基体中的分布情况。结果表明,在相同磁场强度下,小粒度颗粒更容易分布均匀,低磁场强度容易使密度小于基体的B4C颗粒分布均匀,密度大于基体的SiC颗粒容易在较高的磁场强度下分布均匀。测试了不同粒度增强基体均匀分布的材料的硬度和耐磨性,分析了颗粒分布对复合材料的硬度和耐磨性的影响。本文采用连续性介质理论结合外加颗粒在离心力场中的运动规律,及液态金属在离心力场、电磁力场中的运动规律,基于柱坐标系建立了离心力场、电磁力场下复合材料中外加颗粒沿径向的一维分布数学模型。采用该数学模型模拟了电磁离心铸造SiCp/Al复合材料不同磁场强度和不同粒度时SiC颗粒在基体Al中分布; 模拟了SiCp/Fe复合材料中SiC颗粒的分布。同时将模拟结果与自测的数据以及文献中的数据进行了比较,两者吻合程度较好,验证了模拟的可信度。更多还原

【Abstract】 Two different Al matrix functional gradient materials, one reinforced by two different granularity SiCp and the other by SiCp and B4Cp in the same size, were prepared by Electromagnetic Centrifugal Casting(EMCC). The particle distribution in the composites which were prepared with different magnetic field strength was tested. Results show that it is much easier for the smaller particles to scatter evenly with the same magnetic field strength. The B4Cp whose density is smaller than Al scatter evenly with lower magnetic field strength; yet the SiCp whose density is larger than Al scatter evenly with higher magnetic field strength. The hardness and the abrasion resistance of the two composites were tested, and the effect of particle distribution to these mechanical properties of the composites was studied. The one dimension numerical model of particle reinforced Al matrix composite in the magnetic field and the centrifugal field was founded based on cylindrical coordinates, which resorts to the theory of continuity medium, the law of liquid metal in the magnetic field and the motion law of particles in the centrifugal field. Based on this model, the SiC particle distribution in SiCp/Al by (EMCC) was modeled and the SiC particle distribution of SiCp/Fe by (EMCC) was also modeled and discussed.更多还原