热冲击对添加纳米TaC的SPS烧结钨力学性能的影响  

Effect of Thermal Shock on Mechanical Properties of Dispersion Strengthened Tungsten with Nano-TaC by SPS

作　　者：张苹苹[1] 沈卫平[1] 李岩[1] 丁鑫[1] 

机构地区：[1]北京科技大学材料科学与工程学院核材料研究所,北京100083

出　　处：《热加工工艺》2012年第4期88-91,共4页Hot Working Technology

基　　金：国家磁约束核聚变能研究专项(2010GB109000);国家重点基础研究发展计划(973计划)项目(2008CB717802)

摘　　要：用放电等离子体烧结法(SPS)制备了纳米碳化钽(TaC)弥散强化钨块,烧结钨块在800℃下保温5 min,然后充入室温下的氩气10 min,进行抗热冲击性试验,研究了不同热冲击次数和TaC含量对烧结钨块力学性能的影响。结果表明:烧结钨块的相对密度随热冲击次数的增加而降低,当冲击150次时试样的相对密度达到了最低,随TaC含量的增多,相对密度先增大后降低;烧结钨块经热冲击后,维氏硬度和抗弯强度都增大,并且维氏硬度随TaC含量的增多也显著提高,当冲击150次后,TaC含量为4%时烧结钨得到了最高硬度(1300 HV0.1/10)。Dispersion strengthened tungsten with nano-tantalum carbide(TaC) was prepared by spark plasma sintering(SPS) and then the thermal shock experiment was carried out under condition of bulk tungsten heated at 800℃ for 5 min and argon filled at room temperature for 10 min.The effects of the number of thermal shock and the content of TaC on the mechanical properties of tungsten were studied.The results show that the relative density of tungsten decreases when the number of thermal shock increases,and the relative density is lowest when the number of thermal shock is 150.The Vickers hardness and bending strength increase after thermal shock,and the hardness increases with increasing the content of TaC.When the content of TaC is 4% and the number of thermal shock is 150,the hardness is highest(1300 HV0.1/10).

关 键 词：热冲击 钨(W) 碳化钽(TaC) 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]