(上海工程技術(shù)大學(xué) 材料工程學(xué)院，上海 201620)
摘 要: 在真空環(huán)境下，將銅熔滲到鉬纖維預(yù)制體中，制得纖維結(jié)構(gòu)的致密的鉬銅復(fù)合材料。通過控制鉬纖維預(yù)制體的表觀密度，可以方便地改變鉬銅復(fù)合材料的成分組成。采用掃描電鏡和金相顯微鏡觀察材料的微觀組織形貌，研究工藝參數(shù)對(duì)鉬銅復(fù)合材料的成分、密度、硬度和電導(dǎo)率的影響。結(jié)果表明：采用無紡技術(shù)結(jié)合模壓成形獲得的鉬纖維預(yù)制體可形成較寬范圍的孔隙度，從而得到鉬含量不同的鉬銅復(fù)合材料；熔滲工藝制得的鉬銅復(fù)合材料具有致密均勻、特征明顯的纖維結(jié)構(gòu)組織；所得鉬銅復(fù)合材料的致密度均達(dá)到99%以上。當(dāng)鉬質(zhì)量分?jǐn)?shù)為84.77%時(shí)，得到的材料致密度達(dá)到最大值99.43%，其硬度為226.7HV，電導(dǎo)率為16.5 MS/m。
關(guān)鍵字: 纖維結(jié)構(gòu)；鉬銅復(fù)合材料；鉬纖維；熔滲
（School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China）
Abstract:In vacuum environment, the dense fiber-structured molybdenum-copper (Mo-Cu) composites were fabricated by infiltrating liquid copper into molybdenum fibrous preform. By controlling the relative density of molybdenum fibrous preform, the composition of Mo-Cu composites could be easily changed. The microstructure and morphologies of Mo-Cu composites were observed by scanning electron microscopy and optical microscopy, and the effects of process parameters on the composition, physical and mechanical properties were investigated. The results indicate that molybdenum fibrous preform obtained by non-woven technology with mould pressing formation has wider range of porosity, Mo-Cu composite with different molybdenum contents are obtained. The Mo-Cu composites have dense and homogeneous structure with obvious fibrous character by infiltration. The relative density of the composites is above 99%. When the mass fraction of molybdenum is 84.77%, the maximum relative density reaches 99.43% for fiber-structured Mo-Cu composites. Meanwhile, their hardness and electrical conductivity are 226.7HV and 16.5 MS/m, respectively.
Key words: fibrous structure; molybdenum-copper composites; molybdenum fiber; infiltration
