气泡形核和长大对Gasar多孔Cu的气孔结构和分布的影响

doi:10.11901/1005.3093.2016.431

材料研究学报

2017, Vol. 31

Issue (9): 641-649 DOI: 10.11901/1005.3093.2016.431

研究论文

本期目录 | 过刊浏览

气泡形核和长大对Gasar多孔Cu的气孔结构和分布的影响

李飞¹, 李再久^2,³(

), 田娟娟³, 谢明³, 朱绍武³, 陈家林³

1 昆明理工大学城市学院昆明 650051
2 昆明理工大学航空学院昆明 650500
3昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室昆明 650106

Effect of Nucleation and Growth of Pores, and Solidification Mode on Pore Structure and Distribution of Lotus-type Porous Cu

Fei LI¹, Zaijiu LI^2,³(

), Juanjuan TIAN³, Ming XIE³, Shaowu ZHU³, Jialin CHEN³

1 City College, Kunming University of Science and Technology, Kunming 650051, China
2 Aviation College, Kunming University of Science and Technology, Kunming 650500, China
3 State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China

引用本文:

李飞, 李再久, 田娟娟, 谢明, 朱绍武, 陈家林. 气泡形核和长大对Gasar多孔Cu的气孔结构和分布的影响[J]. 材料研究学报, 2017, 31(9): 641-649.
Fei LI, Zaijiu LI, Juanjuan TIAN, Ming XIE, Shaowu ZHU, Jialin CHEN. Effect of Nucleation and Growth of Pores, and Solidification Mode on Pore Structure and Distribution of Lotus-type Porous Cu[J]. Chinese Journal of Materials Research, 2017, 31(9): 641-649.

全文: PDF(1554 KB) HTML

摘要:

研究了气泡形核及长大对Gasar气孔结构和分布的影响。结果表明：气孔在柱状晶过渡区内生长时,其定向生长受限使气孔的长度变短,内壁不光滑,圆整度变小;当基体以柱状晶生长时气孔随基体共生生长形成典型藕状多孔结构,气孔的长度增加,内壁光滑,圆整度增加。随着气体压力的增大形核功降低导致气泡形核率增加,从而使藕状多孔Cu中气泡的分布逐渐从晶界转移到晶内,试样的平均孔径减小而气孔的密度数和均匀性提高。由于固液界面上的沟槽和晶界的特殊性,气泡在晶界处的形核优先于晶内,导致晶界处气孔的平均直径比晶内气孔的直径大。

关键词 ：金属材料, Gasar, 藕状多孔Cu, 凝固模式, 形核, 长大

Abstract：

The effect of pore nucleation,pore growth and solidification mode of matrix on pore structure and distribution of lotus-type porous Cu were investigated. It is difficult to obtain an ordered pore structure when the matrix is a region of columnar transition. An ordered pore structure could be obtained only when the matrix transforms to columnar grains with increase of pore length and circularity. The pore distribution moved from the grain boundaries to the interior of grain with increasing gas pressure. The average pore diameter decreased and the pore density increased due to decrease of activation energy and increased rate of nucleus formation. Due to slight depressions at grain boundaries regions at the solid/liquid interface, the pore nucleation is favored at grain boundaries and thus the average pore diameter in the grain boundaries is larger than that of in the grains.

Key words： metallic materials Gasar lotus-type porous Cu solidification model pore nucleation pore growth

收稿日期: 2016-07-22

ZTFLH:

TG146

基金资助:贵金属先进材料协同创新中心协同创新基金(2014XT03)和稀贵金属综合利用新技术国家重点实验室开放课题(SKL-SPM-201545)

作者简介:

作者简介李飞,男,1981年生,讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.431 或 https://www.cjmr.org/CN/Y2017/V31/I9/641

图1 藕状多孔Cu制备装置示意图

表1 藕状多孔Cu试样的工艺参数及其对应的结构参数

图2 藕状多孔Cu横截面及纵剖面图(PH2=0.2 MPa, PAr=0 MPa)

图3 凝固模式对2H0Ar试样气孔结构的影响

图4 气体压力P对气孔密度数n的影响

图5 气体压力P对气孔结构和分布的影响

图6 Gasar工艺中气泡在熔体中的形核

The model of bubble nucleation		The radius of critical nucleus	The activation energy and the shape factor
Homogeneous bubble nucleation		$r n = 2 σ L - G 3 (P H 2 + P Ar)$	$Δ G n = 19 ? Δ G i (r n)$
Heterogeneous bubble nucleation	Planar interfaces	$r' n = 2 σ L - G 3 (P H 2 + P Ar)$	$Δ G n' = 19 ? Δ G i (r' n) ? f (θ)$ $f (θ) = (2 + cosθ) (1 - cosθ) 2 4$
Heterogeneous bubble nucleation	Pits or cracks	$r'' n = 2 σ L - G 3 (P H 2 + P Ar)$	$Δ G n'' = ΔG'' ? f (θ) = 19 ? Δ G i (r'' n) ? f (θ ， γ)$ $f (θ, γ) = 1 - sin (θ + γ 2) 4 sin (γ 2) ? 2 sin (γ 2) - cosθ 1 + sin (θ + γ 2)$

表2 不同气泡形核方式对应的形核功和临界形核半径

图7 不同气泡形核模式的与形状因子和系统吉布斯自由能曲线

表3 计算气泡形核所用的参数

图8 固液界面形貌与气泡的形核

图9 PH2、PAr及ΔT对气泡生长的影响

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