前驱体浸渍法制备泡沫镍屈服强度与孔结构的关系

发布时间：2018-03-08 07:01

本文选题：泡沫镍　切入点：有限元模拟　出处：《粉末冶金材料科学与工程》2017年04期 　论文类型：期刊论文

【摘要】：采用有限元模拟技术计算不同孔结构泡沫镍的屈服强度,并以气雾化Ni-20Cr合金粉末为原料,以不同孔径的聚氨酯泡沫为模板,控制浸渍工艺制备出不同孔径与不同密度的泡沫镍铬合金,研究合金屈服强度随密度与孔径尺寸的变化关系。有限元模拟计算结果表明,开孔泡沫金属材料的屈服强度符合Gibson-Ashby方程,在开孔泡沫金属材料密度一定的情况下,材料的屈服强度不随孔径的变化而变化。实验结果表明,对于相同孔径的泡沫金属材料,其屈服强度和相对密度的关系为σ/σs与相对密对(即ρ/ρs)的1.5次方呈线性关系(σ和σs分别为泡沫材料与致密材料的屈服强度;ρ和ρs分别为泡沫材料与致密材料的密度);而具有相同密度和不同孔径的泡沫镍铬合金,其屈服强度很接近,验证了开孔泡沫金属材料屈服强度随密度的变化规律符合Gibson-Ashby方程。
[Abstract]:The yield strength of nickel foam with different pore structures was calculated by finite element simulation technique. The polyurethane foam with different pore sizes was used as the template, and the gas-atomized Ni-20Cr alloy powder was used as the raw material. Foam Ni-Cr alloy with different pore sizes and different densities was prepared by controlling impregnation process. The relationship between yield strength and pore size was studied. The finite element simulation results show that the yield strength of the alloy varies with the pore size. The yield strength of porous metal foam materials conforms to the Gibson-Ashby equation. When the density of porous metal foams is constant, the yield strength of the materials does not change with the pore size. The experimental results show that the yield strength of foam metal materials with the same pore size is similar to that of foamed metal materials with the same pore size. The relationship between yield strength and relative density is linear between 蟽 / 蟽 s and relative density pair (蟻 / 蟻 s) (蟽 and 蟽 s are respectively the yield strength of foam material and dense material, 蟻 and 蟻 s are density of foam material and dense material, respectively. A foamed Ni-Cr alloy with the same density and different pore sizes, The yield strength of the porous metal foams is very close, which verifies that the variation of the yield strength with the density accords with the Gibson-Ashby equation.
【作者单位】：西北有色金属研究院金属多孔材料国家重点实验室;西安赛隆金属材料有限责任公司;西安交通大学机械结构强度与振动国家重点实验室;
【基金】：国家高技术研究发展计划(863计划)资助项目(2015AA034304) 陕西省科技新星项目(2015KJXX78)
【分类号】：TB383.4;TG146.15

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