(西安交通大學(xué)材料科學(xué)與工程學(xué)院，西安710049)
摘 要: 研究了石墨含量對Cu基滑板燒結(jié)膨脹的影響與作用機(jī)理，石墨的體積百分?jǐn)?shù)依次為0、7.1%、12%、13.5%、16.6%，其對應(yīng)的體膨脹率依次為-6.4%、4.6%、16%、21%、32%。膨脹機(jī)制是石墨阻礙金屬顆粒形成燒結(jié)頸，使燒結(jié)初期因釋放應(yīng)變能和排放成型劑而引起的膨脹得以保留。燒結(jié)膨脹率與石墨含量近似于線性關(guān)系。
關(guān)鍵字: 燒結(jié) Cu基粉末冶金 銅石墨材料 燒結(jié)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
