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火焰喷涂多孔Mo骨架结构对熔渗制备Mo/Cu复合材料性能的影响

发表时间:2016-09-30  浏览量:1193  下载量:388
全部作者: 姚建洮,李 一,李长久,杨冠军,李成新
作者单位: 西安交通大学材料科学与工程学院;金属材料强度国家重点实验室
摘 要: 基于火焰喷涂沉积的多孔Mo骨架熔渗铜制备高Cu含量的Mo/Cu复合材料。通过对还原和烧结热处理的多孔Mo骨架熔渗制备的Mo/Cu复合材料的研究,揭示了多孔Mo骨架微观结构对熔渗制备的Mo/Cu复合材料性能的影响。研究表明,液态Cu能够较好地熔渗进多孔Mo骨架形成致密的Mo/Cu复合材料。还原态Mo骨架制备的Mo/Cu复合材料存在大颗粒Mo,周围弥散分布着因还原而生成的Mo微粒,而烧结态Mo骨架制备的Mo/Cu复合材料中Mo和Cu边界清晰,制备的Mo/Cu复合材料的硬度高于还原态。Mo/Cu复合材料的导热率、热膨胀系数随着测试温度和Cu含量的升高而增大。烧结态多孔Mo骨架制备的Mo/Cu复合材料的导热率比还原态低,而热膨胀系数比还原态高。
关 键 词: 复合材料;多孔 Mo;Mo/Cu;熔渗;微观结构;火焰喷涂
Title: Effect of Skeleton Structure on the Properties of Mo/Cu Composites by Infiltrating Molten Cu into Flame-sprayed Prous Morous Mo Flame-Sprayed by Semi-molten Particles
Author: YAO Jiantao, LI Yi, LI Changjiu, YANG Guanjun, LI Chengxin
Organization: State Key Laboratory for the Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University
Abstract: In this paper, Mo/Cu composites with high copper contents were manufactured by infiltrating molten copper into flame-sprayed porous molybdenum. Through sintering porous Mo flame-sprayed by following reduction treatment, the effect of the skeleton structure of porous Mo on the properties of the resultant Mo/Cu composites was examined. Results showed that molten copper can effectively infiltrate into flame-sprayed porous Mo to form dense Mo/Cu compoiste. Many small Mo particulates are satellited around large Mo particles in the Mo/Cu composites made from the as-reduced porous Mo, while the Mo/Cu composites made from the post-reduction sintered porous Mo present clear interfaces between Mo and Cu, which has a higher hardness. We found that the thermal conductivity and coefficient of thermal expansion of Mo/Cu composites increased with the increase of the Cu content and test temperature as well. With post-reduction sintering treatment to flame sprayed porous Mo, the Mo/Cu composite presents a lower thermal conductivity and higher coefficient of thermal expansion than that from as-reduced.
Key words: composite material; porous Mo; Mo/Cu; melt infiltrating; microstructure; flame-spray
发表期数: 2016年9月第18期
引用格式: 姚建洮,李 一,李长久,等. 火焰喷涂多孔Mo骨架结构对熔渗制备Mo/Cu复合材料性能的影响[J]. 中国科技论文在线精品论文,2016,9(18):1840-1849.
 
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