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金属空心球复合材料重力铸造工艺研究

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基于对金属空心球复合材料的结构分析,采用金属型重力铸造法制备金属空心球复合材料.介绍了金属空心球复合材料金属型重力铸造工艺流程,并设计了一种成本低廉、简易成型、且能多次使用的金属型模具,且对金属空心球复合材料进行了实验试制及材料验证.结果表明,采用金属型重力铸造法能够制备出孔壁结构完整且孔洞随机分布的金属空心球复合材料,能实现空心球单一设计与梯度设计;金属空心球复合材料基体与空心球壁组织较为致密,且形成了厚度为25～30μm的界面层;金属空心球复合材料的应力-应变曲线具有明显的弹性阶段、塑性平台阶段和致密化阶段,且采用空心球梯度设计的金属空心球复合材料相较于空心球单一设计的金属空心球复合材料,其基本力学性能有明显的提升.最后,与传统的闭孔泡沫铝材料进行了对比分析,金属空心球复合材料整体稳定性更高,吸能效果更强.
Investigation on Gravity Casting Process of Metallic Hollow Sphere Composites
Based on the structural analysis of metal hollow sphere composites,metal hollow sphere composites were pre-pared by metal mold gravity casting.The technological process of metal mold gravity casting of metal hollow sphere composite is introduced,and a metal mold with low cost,simple molding and multiple use is designed.The experimental trial produc-tion and material verification of metal hollow sphere composite are carried out.The results show that the metal hollow sphere composite with complete pore wall structure and random distribution of pores can be prepared by metal mold gravity casting method,and the single design and gradient design of hollow spheres can be realized.The matrix and hole wall structure of metal hollow sphere composites are relatively dense,and the thickness is about 25～30 μm interface layer.The stress-strain curve of metal hollow sphere composite has obvious elastic stage,plastic plateau stage and densification stage,and the met-al hollow sphere composite material designed with hollow sphere gradient has significantly improved its basic mechanical properties compared to the metal hollow sphere composite material designed with a single hollow sphere.Finally,compared with the traditional closed cell aluminum foam,the metal hollow spheres composite has higher overall stability and stronger energy absorption.

hollow sphere reinforced compositesgravity castingmold designcasting processexperimental verifi-cation

亓昌、杨孟欣、于晨、崔丽萍、杨姝

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大连理工大学汽车工程学院 工业装备结构分析国家重点实验室,辽宁 大连 116024

大连理工大学 宁波研究院,浙江 宁波 315016

金属空心球复合材料 重力铸造 模具设计 铸造工艺 实验验证

国防科技创新特区计划项目中央高校基本科研业务费专项基金资助项目中央高校基本科研业务费专项基金资助项目

19-H863-03-LZ-001-005-01DUT20LAB132DUT21GF203

2024

10.7502/j.issn.1674-3962.202205009

中国材料进展
中国材料研究学会 西北有色金属研究院

中国材料进展

CSTPCD北大核心
ISSN：1674-3962
年,卷(期)：2024.43(5)
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