(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: 采用濕化學(xué)法制備W-3%ZrC-0.3%Y2O3(質(zhì)量分?jǐn)?shù))材料，研究該材料在1800~1920 ℃的燒結(jié)致密化行為，通過(guò)與W-3ZrC材料及純鎢材料燒結(jié)態(tài)力學(xué)性能和顯微組織的對(duì)比研究，分析復(fù)合添加ZrC和Y2O3對(duì)鎢材料強(qiáng)韌化的作用和意義。結(jié)果表明：W-ZrC-Y2O3材料的致密度和抗拉強(qiáng)度均呈現(xiàn)出隨燒結(jié)溫度升高先增加后降低的趨勢(shì)，其相對(duì)密度和抗拉強(qiáng)度均在1860 ℃達(dá)到最大值，分別為97.8%、446 MPa；添加第二相粒子能有效細(xì)化鎢材料的晶粒，Y2O3/ZrC復(fù)合添加較單一ZrC能更有效細(xì)化鎢晶粒，晶粒由W-3ZrC的10 μm降低至5~8 μm。復(fù)合強(qiáng)化相粒子改變了斷裂過(guò)程中裂紋擴(kuò)展的形狀和長(zhǎng)度，起到強(qiáng)化和韌化作用。
關(guān)鍵字: 第二相粒子；復(fù)合強(qiáng)化；晶粒細(xì)化；致密度
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The composite materials of W-3%ZrC-0.3%Y2O3 (mass fraction) were prepared by wet chemical methods. The densification behavior was studied when the composite materials was sintered at 1800-1920 ℃. By comparing with mechanical properties and microstructure of W-3ZrC materials and pure tungsten material, the function and meaning of compounding adding ZrC and Y2O3 were researched. The results show that the relative density and intensity increase at first, and then decrease with increasing sintering temperature. And the relative density and tensile strength reach 97.8% and 446 MPa, respectively, when sintered at 1860 ℃. The second phase particles can effectively refine the grain size of tungsten material, and the composite adding Y2O3/ZrC is more effective. The grain decreases from 10 μm of W-3ZrC to 5-8 μm of W-3ZrC-0.3Y2O3. The composite strengthening phase particles can change the shape and length of crack propagation, which proves that ZrC and Y2O3 are helpful to improve the strength and toughness of composites.
Key words: second phase particles; composite reinforcement; grain refinement; density
