(西安交通大学材料科学与工程学院，西安710049)
摘 要: 研究了石墨含量对Cu基滑板烧结膨胀的影响与作用机理，石墨的体积百分数依次为0、7.1%、12%、13.5%、16.6%，其对应的体膨胀率依次为-6.4%、4.6%、16%、21%、32%。膨胀机制是石墨阻碍金属颗粒形成烧结颈，使烧结初期因释放应变能和排放成型剂而引起的膨胀得以保留。烧结膨胀率与石墨含量近似于线性关系。
关键字: 烧结 Cu基粉末冶金 铜石墨材料 烧结模型
EXPANSION OF COPPER BASE ALLOY
（School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049）
Abstract:The influences of graphite content on the sintering expansion of copper base alloy and its expanding mechanism were investigated. The graphite contents were 0, 7.1%, 12%, 13.5% and 16.6% in volume fraction respectively, with the corresponding volume expanding ratios to be -6.4%, 4.6%, 16%, 21% and 32%. The sintering expandingmechanism is that the graphite powders separate the metal powders and thus hinder the formation of neck during sintering, which makes the sintering expansion due to the releasing of strain energy and the burning off of binder in the early stage of the sintering process be reserved till the end of sintering, and the sintering expanding ratio is linear with the graphite content.
Key words: sintering copper base powder metallurgy copper graphite material sintering model
