微量Hf掺杂对放电等离子体烧结钨耐热冲击性能的影响  

Effect of trace Hf doping on thermal shock resistance of spark plasma sintered tungsten

作　　者：刘莎莎 练友运[1] 封范[1] 王建豹 陈哲 谭扬 刘翔[1] LIU Sha-sha;LIAN You-yun;FENG Fan;WANG Jian-bao;CHEN Zhe;TAN Yang;LIU Xiang(Southwestern Institute of Physics,Chengdu 610041,China)

机构地区：[1]核工业西南物理研究院

出　　处：《材料热处理学报》2019年第11期96-101,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(11605044)

摘　　要：在高纯W粉中添加不同含量的HfH2粉末,通过放电等离子烧结(SPS)将合金粉末制备成直径15 mm的W-(0、0.1 mass%、0.3 mass%、0.5 mass%、0.6 mass%、1.0 mass%)Hf合金样品,分析了Hf含量对烧结样品的微观组织、密度和维氏硬度的影响,并对烧结样品的耐热冲击性能进行了测试。结果表明:纯W在0.22 GW/m2的热负荷下即生成裂纹网,掺杂少量Hf(≤0.3 mass%)时引起W-Hf合金的硬度下降,Hf掺杂量在0.5 mass%及以上时有强化作用;Hf元素的加入可以明显改善纯钨的耐热冲击性能,Hf含量高于0.3 mass%时,W-Hf合金的裂纹阈值提高到了0.22~0.33 GW/m2,且在Hf含量为0.6 mass%时,在0.44 GW/m2的热负荷下W-Hf合金也只生成了少量的微裂纹。HfH2 powder with different content was added to high purity W powder, and W-Hf alloy samples with diameter of 15 mm were prepared by spark plasma sintering(SPS). The effects of Hf content on microstructure, density and Vickers hardness of the sintered W-Hf alloy samples were analyzed, and the thermal shock resistance of the sintered samples were tested. The results show that the pure W sample forms a crack network at the thermal load of 0.22 GW/m2, the hardness of the sintered W-Hf alloy decreases when a small amount of Hf is added(≤ 0.3 mass%), while when the content of Hf is 0.5 mass% or more, it can strengthen the sintered W-Hf alloy. The thermal shock resistance of pure tungsten can be obviously improved by adding Hf. When the content of Hf is higher than 0.3 mass%, the crack threshold of the W-Hf alloy is increased to 0.22-0.33 GW/m2. When the content of Hf is 0.6 mass%, only a small number of microcracks are formed in the W-Hf alloy under the thermal load of 0.44 GW/m2.

关 键 词：钨-铪 放电等离子烧结 耐热冲击 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TL62[金属学及工艺—金属材料]