【作者】 张新；

【导师】 杜云慧；

【作者基本信息】 北京交通大学 ， 材料学， 2008， 硕士

【摘要】 铝-7石墨复合材料兼有铝基体导热快、石墨润滑性能优良等特点,是制造新型钢背轴瓦的理想材料,需求领域广泛。对于铝-7石墨复合材料,石墨的分布状态直接决定其综合性能的好坏,是该领域的首要问题。本文采用流体模拟软件FLUENT对机械搅拌法、电磁搅拌法和机械电磁复合搅拌法制备铝石墨半固态浆料的过程进行了模拟研究,并通过实际验证得到了合理的制备工艺,本文具体研究如下:1、针对目前粘度模型存在模拟误差较大的问题,本文确定了适合于FLUENT软件数值模拟粘度系数的合理范围,提高了模拟精度。2、通过对石墨颗粒分布的模拟,得出电磁搅拌频率和搅拌桨叶的倾斜角度。3、对机械搅拌、电磁搅拌和机械电磁复合搅拌制备铝-7石墨半固态浆料的过程进行了计算机模拟和敏感性分析,得出网格划分密度对模拟的影响4、通过对湍流动能、搅拌时间、搅拌温度、搅拌转速、电磁电流和石墨颗粒分布等进行模拟和分析对比,得出进行机械电磁复合搅拌时石墨的浓度差最小,是较为合理的搅拌方法,同时得出并通过实验确定了合理的搅拌工艺参数,为实际生产提供了参考。更多还原

【Abstract】 The aluminum-7graphite composite material is the ideal functional material to make the new bearings because the Al substrate has the good thermal conduction and the graphite has the good lubricant property, so the Aluminum-graphite composite has the wider application. The distribution of graphite determines the performance of the aluminum-7graphite composite material, and distribution is the chief issue in the field. In this paper, the mechanical stirring method、the electromagnetic stirring method and the mechanical and electromagnetic composite stirring method were studied by the simulation software FLUENT to prepare the semi-solid slurry of Aluminum-graphite material. The specific studies of this paper are as followings:1、To solve the inaccuracy of the simulation in the viscous model, this paper definites the reasonable scope of the viscous modules in the simulation which is if fit for the simulation software FLUENT to raise the accuracy of the simulation.2、The paper gets the frequency of the electromagnetic stirring and the tilt angle of the blade through simulating the distribution of the graphite particles.3、The paper gets the result that the density of the mesh has influence on the simulation through simulating and the analyzing the sensibility of the mechanical stirring method、the electromagnetic stirring method and the mechanical and electromagnetic composite stirring method.4、The paper gets that the best stirring method is the mechanical and electromagnetic composite stirring method and also gets the best process parameters of the stirring method through the analysis of the turbulence kinetic energy、the stirring time、the stirring temperature、the stirring velocity、the electromagnetic stirring current、the rheological properties and the distribution of graphite particles, so as to offer the reference to the manufacture.更多还原