(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 嘗試采用含量較高的粘結(jié)劑利用流動(dòng)溫壓成形結(jié)合熔滲制備W70Cu杯狀異形件。通過(guò)改變鎢骨架中Cu粉類型(包括霧化Cu粉，電解Cu粉和超細(xì)Cu粉)、粘結(jié)劑添加量和成形溫度，考察不同工藝參數(shù)對(duì)杯狀試樣的密度分布影響，以獲得流動(dòng)溫壓成形異形鎢骨架的最佳工藝。結(jié)果表明：添加體積分?jǐn)?shù)35％的粘結(jié)劑時(shí)提高壓制溫度會(huì)明顯改善鎢骨架孔隙度分布的均勻性；同時(shí)，由于不同Cu粉具有不同的表面形貌及粒度，對(duì)于鎢骨架的孔隙度分布均勻性也有較大的影響。壓制溫度55 ℃時(shí)添加表面光滑形狀規(guī)則的超細(xì)Cu粉和35％(體積分?jǐn)?shù))粘結(jié)劑的混合粉末成形的鎢骨架的孔隙分布最均勻, 該骨架在1 200 ℃熔滲30 min后，密度分布均勻，整體密度達(dá)到14.2 g/cm3(相對(duì)密度為99.0％)。
關(guān)鍵字: W70Cu；流動(dòng)溫壓成形；形狀復(fù)雜零件；熔滲
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: W70Cu materials with a complex “cup” shape manufactured by a novel process (warm flow compaction+ sintering filtration) were studied systematically. The effects of the type of copper powder (atomization copper powder, electrolytic copper powder and ultra-fine grained copper powder), content of binder, and pressing temperature on porosity distribution were investigated. The results show that the complex W-skeleton with a homogeneous porosity distribution can be obtained with 35% binder addition and fairly high temperature for compaction. Meanwhile, different types of copper powders with different particle sizes and surface morphologies greatly affect the porosity distribution of the complex W-skeleton. The W-skeleton with a homogeneous porosity distribution can be obtained at 55 ℃, as the ultra-fine copper powder with slick and regular surface is used as a copper source and 35% binder is dispersed in the powder composite. As a result, a homogeneous density distribution and a general density of 14.2 g/cm3 (relative density 99.0%) can be achieved by infiltrating at 1 200 ℃ for 30 min.
Key words: W70Cu; warm flow compaction; complex shape part; infiltration
