熔渗-锻造-轧制制备Mo-15%Cu的研究  

Analysis of fabricating Mo-15%Cu by pre-infiltration,warm-die-forging and rolling

作　　者：阮涛[1] 王志法[1] 姜国圣[1] 唐仁政[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金技术》2011年第4期250-254,共5页Powder Metallurgy Technology

基　　金：MKPT-05-3432004-2005W/Cu材料工程化研究

摘　　要：Mo-Cu合金由于其高导热性和可调的低热膨胀性而得到广泛应用。但是,目前Mo含量高于80%(质量分数,下同)的Mo-Cu合金的制备存在很大困难。提出了一种制备高Mo含量的Mo-Cu合金的新方法:将Mo粉压制成相对Mo-15%Cu合金密度的60%的压坯;Mo压坯与合金成分配比所需质量的Cu片一起在1200℃熔渗2 h得到预熔渗坯;熔渗坯在950℃锻造得到接近完全致密的合金;锻造所得合金先在600℃热轧变形70%,然后冷轧变形10%。试验结果表明,用此工艺制备Mo-15%Cu合金的综合性能良好,低相对密度(83%)的预熔渗坯经锻造后相对密度提高到99.8%,导热系数从146 W/(m.K)提高到188 W/(m.K),热膨胀系数降低到7.8×10-6/℃,硬度也显著提高。经轧制后总变形量达到80%时材料保持不开裂。Mo-Cu composite has been widely used due to its high thermal conductivity and adjustable low thermal expansion.However it is difficult to fabricate Mo-Cu composite with Mo content more than 80 wt %.In this investigation,a new process was developed to fabricate high Mo content Mo-Cu alloys： Mo powder was compacted to 60 wt %of the density of the composite.The Mo compact was infiltrated at 1200 ℃ for 2 hours with Cu desired for the composite.The infiltrated part was die forged to near full density at 950 ℃.The forged part was first thinned 70% by hot rolling at 950 ℃ and then thinned 10% by cold rollingThe experiment results show that the Mo-15wt%Cu fabricated by the new process has satisfactory properties.The relative density increase from 83% for infiltrated part to 99.8% by die forging,and the coefficient of thermal conductivity（CTC） increase from 146 W/（m·K） to 188 W/（m·K）,meanwhile the CTE decrease to 7.8×10-6/℃ and the hardness increase dramatically.The composite is thinned 80% by rolling without cracking.

关 键 词：Mo-Cu 熔渗 锻造 轧制 

分 类 号：TG156.3[金属学及工艺—热处理]