贾建刚,井勇智.基于NaCl Beads制备的泡沫Al孔结构控制与表征[J].稀有金属材料与工程,2019,48(10):3275~3281.[jia jian gang,jing yong zhi.Structure and Control Characterization of Al Foam Pores Prepared by NaCl Beads[J].Rare Metal Materials and Engineering,2019,48(10):3275~3281.]
基于NaCl Beads制备的泡沫Al孔结构控制与表征
投稿时间:2018-05-29  修订日期:2018-06-22
中文关键词:  多孔钛  泡沫金属  发泡法  造孔剂  增材制造
基金项目:国家自然科学基金资助(51461029);甘肃省科技重大专项计划项目(1602GKDD012)
中文摘要:
      以淀粉、蒸馏水、NaCl粉末为原料,混合制成胶状盐团后70℃油浴加热,同时在机械搅拌切削的作用下得到球形度较高的NaCl小球,然后经高温烧结获得粒径分布主要在0.4-2.4mm,表面分布有少量微孔(孔径约10-20μm)且纯净度很高的NaCl小球。选用0.6-1.0mm的盐球作为造孔剂,利用Autotap震动将铝粉填入“盐床”缝隙,再经200MPa冷压成型后获得生坯,然后在蒸馏水中浸泡将盐球溶解去除,最后在460℃下烧结2h得到结构可控且工艺重现性很高的三维连通开孔性泡沫铝,其相对密度与孔隙率分别为0.217和78.3%。泡沫铝胞洞之间的连通窗口数量平均在4-6个,窗口尺寸约在120-200μm之间;压缩载荷-位移曲线表明泡沫铝在压缩变形过程中经历了弹性变形阶段-坪应力区-应力陡增阶段,表现出典型的泡沫金属压缩力学性能特点,其最大抗压强度与杨氏模量分别是2.42MPa和0.38GPa。
Structure and Control Characterization of Al Foam Pores Prepared by NaCl Beads
英文关键词:Porous titanium  Foams metal  Foaming method  Space holder  Additive manufacturing
英文摘要:
      NaCl beads were prepared using starch, distilled water and NaCl powders as raw materials.The raw constituents were mixed to form a colloidal salt paste and then thermal treated in 70°C oil under vigorous stirring, high spherical NaCl beads were obtained under the cutting action of the blender. Afterwards, the “fried” NaCl beads with a particle size distribution of 0.4-2.4mm were calcined and sintered at 740°C, and thus the high purity NaCl beads with small amount of micro-pore (pores size about 10-20μm) on the surface were obtained. The 0.6-1.0mm salt beads were selected to form a “salts bed” in a steel die and the aluminum powder was filled into “salt bed” gap via a tapping method by the Autotap instrument.The tapped mixture was cold pressed under 200MPa to obtain the green compact parts. Then the salts were dissolved and removed in distilled water and three-dimensional open-cell green Al foam with controllable structure and highly reproducibility was derived. After sintering at 460 °C for 2 h, the final Al foam was obtained and its relative density and porosity were 0.217 and 78.3%. The number of connectivity windows between cellular aluminum cells is 4-6 on average, and the window size is about 120-200 μm. The compressive load-displacement curve shows that the aluminum foam undergoes an elastic deformation stage - the plateau stress area - the stress steep increase stage, The curvemanifest typical foam metal compression mechanical properties, and its compressive strength and Young''s modulus are 2.42 MPa and 0.38 GPa.
作者单位E-mail
贾建刚 兰州理工大学 甘肃省有色金属先进加工与再利用国家重点实验室 lzhjiajiangang@163.com 
井勇智 兰州理工大学 甘肃省有色金属先进加工与再利用国家重点实验室 jmuzhi@163.com 
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