摘要
对4种不同粒度Cu粉进行了研究,对其粉末颗粒的形貌和氧含量进行对比分析,并分别在700、750、800、850℃4种烧结温度下制备了烧结试样,利用阿基米德排水法测试样密度,HR-150A型洛氏硬度计测量试样的HRB值,三点弯曲法测定试样的抗弯强度和SEM观察试样断口形貌。实验结果表明:随着烧结温度的升高,4种测试块的密度都呈增加趋势,当温度超过800℃后,密度逐渐趋于平缓,而且粉末粒度越粗,密度随温度增加的趋势越大;粉末越细,致密化的温度越高;Cu-325烧结体的抗弯强度随着烧结温度的提高而增加,世佳威尔Cu烧结体的抗弯强度在800℃以前在缓慢下降,超过800℃有开始增加,而精研Cu-400和Cu-P3烧结体的抗弯强度随着烧结温度的升高在逐渐下降;随着温度的升高,晶粒都在不断地长大,而Cu-325烧结体对温度敏感性较小,当温度达到800℃以后,晶粒几乎不再长大;从断口形貌上得到,4种铜粉的断裂方式均为韧性断裂,粉末越细,韧窝越细小。
Four types of Cu powder with varying particle size and morphology were investigated,and the morphological characteristics and oxygen content of the powder particles were compared and analyzed.Hot-pressed sintered samples were prepared at temperatures of 700,750,800,and 850℃.The sample density was determined using the Archimedes drainage method,while the HRB value was measured using an HR-150A Rockwell hardness tester.The bending strength of the samples was evaluated through a three-point bending test,and SEM observations were conducted to examine the fracture morphology.The results indicate that the density of the four test blocks increases with the increase of sintering temperature;moreover,coarser powders exhibit a greater increase in density with temperature compared to finer powders.Additionally,finer powders require higher densification temperatures for achieving optimal density.Furthermore,increasing sintering temperature leads to a continuous rise in sample density.However,beyond 800℃there is a tendency towards saturation.The bending strength of sintered Cu-325 increases with the increase of sintering temperature.Skarwell Cu demonstrates a gradual decrease in bending strength until reaching 800℃,then it starts to increase again.On the other hand,fine-grained Cu-400 and Cu-P3 experience a progressive decline in bending strength as sintering temperature rises.Notably,Cu-325 exhibits less sensitivity to changes of temperature regarding grain growth.After reaching 800℃,grain growth becomes negligible.Fracture analysis reveals that all four copper powders exhibit ductile fracture behavior.Furthermore,the dimple size decreases with powder fineness increases.
作者
徐强
刘一波
舒晨
杨志威
XU Qiang;LIU Yibo;SHU Chen;YANG Zhiwei(Central Iron&Research Institute,Beijing 100081,China;Beijing Gang Yan Diamond Products Company,Beijing 102200,China;School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《粉末冶金工业》
北大核心
2025年第1期71-76,共6页
Powder Metallurgy Industry
关键词
铜粉烧结体
粉末形貌
烧结性能
力学性能
断口形貌
copper powder
powder morphology
sintering performance
mechanical
fracture morphology
