镍及镍合金多孔材料的制备工艺和结构性能研究
发布时间:2018-07-03 06:07
本文选题:镍基多孔材料 + 蒙乃尔 ; 参考:《昆明理工大学》2017年硕士论文
【摘要】:镍基多孔材料具有形状稳定、耐高温、耐腐蚀、渗透性好等优点,常用于制作过滤材料、电池、电极、吸声材料、吸能材料、及生物材料等功能性材料,具有很好的应用前景和开发价值。目前镍基多孔材料的制备工艺较复杂、成本高、孔隙率和孔径难以控制,本研究采用无毒、化学稳定性好、分解温度高的K2C03作为造孔剂,用烧结-溶解的方法制备镍及镍合金多孔材料。主要研究了镍基多孔材料的制备工艺及参数,以及不同参数对样品孔隙率、孔径、透气度及力学性能的影响,得到以下结论:(1)实验采用粉末冶金法,以K_2CO_3为造孔剂成功制备了纯镍和蒙乃尔多孔过滤片试样,该方法具有工艺简单、流程短、成本低、孔隙率孔径可控等优点。(2)实验所制备的纯镍多孔过滤片试样孔隙率为26.91%~47.32%、平均孔径为6.3μm~14.0μm、厚度在1.82~2.68mm,开孔率在88%以上;蒙乃尔多孔过滤片试样孔隙率为31.38%~46.37%、平均孔径为3.9μm~6.2μm、厚度在1.78~2.67mm,开孔率在90%以上。(3)纯镍和蒙乃尔多孔材料的孔隙率均随着压制压力、烧结温度、保温时间的增加而减小。实验所制备的纯镍多孔过滤片,透气度为96.31~389.98m3/(h·kPa·m2);蒙乃尔多孔过滤片,透气度为21.65~131.95m3/(h·kPa·m2),两种过滤片试样的透气度均随着造孔剂配料体积分数的增加而增加、随压制压力增加减小;在1000℃~1250℃的烧结温度范围内,纯镍多孔材料的孔径、透气度先升高,后降低。在850℃~1000℃的烧结温度范围内,蒙乃尔多孔材料的孔径、透气度先升高,后降低。(4)孔隙率为26.91%~47.32%的多孔镍其抗压强度为25.2MPa~22.8MPa。能满足大多数过滤器件对抗压强度的要求。孔隙率为31.38%~46.37%的蒙乃尔多孔材料在压缩过程中没有表现出明显的屈服平台。随孔隙率增加,应力-应变曲线初试阶段斜率减小,弹性模量下降。
[Abstract]:Nickel-based porous materials have the advantages of stable shape, high temperature resistance, corrosion resistance, good permeability and so on. They are often used to make filter materials, batteries, electrodes, sound-absorbing materials, energy-absorbing materials, and biomaterials and other functional materials. It has good application prospect and development value. At present, the preparation process of nickel-based porous materials is complex, the cost is high, the porosity and pore size are difficult to control. In this study, K2C03, which is nontoxic, chemical stability and high decomposition temperature, is used as pore-forming agent. Nickel and nickel alloy porous materials were prepared by sintering-dissolution method. The preparation process and parameters of nickel based porous materials and the effects of different parameters on the porosity, pore size, air permeability and mechanical properties of the samples were studied. The conclusions are as follows: (1) Powder metallurgy was used in the experiment. Pure nickel and Monel porous filter samples were successfully prepared with K2COS3 as pore-forming agent. The method has the advantages of simple process, short process and low cost. (2) the porosity of pure nickel porous filter is 26.91%, the average pore size is 6.3 渭 m ~ 14.0 渭 m, the thickness is 1.82 ~ 2.68 mm, and the porosity is over 88%; The porosity of Monel porous filter is 31.38%, the average pore diameter is 3.9 渭 m ~ 6.2 渭 m, the thickness is 1.78 ~ 2.67 mm, and the porosity is more than 90%. (3) the porosity of pure nickel and Monel porous materials decrease with the increase of pressing pressure, sintering temperature and holding time. The permeability of pure nickel porous filter is 96.31~389.98m3/ (h KPA m 2), Monel porous filter is 21.65~131.95m3/ (h KPA m 2), the permeability of the two kinds of filter increases with the increase of volume fraction of pore-making agent and decreases with the increase of pressing pressure. At sintering temperature of 1000 鈩,
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