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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)。
Nanocrystalline tantalum carbide (TaC) dispersion strengthened tungsten block was prepared by spark plasma sintering (SPS). The sintered tungsten block was incubated at 800 ℃ for 5 min and then filled with argon at room temperature for 10 min for thermal shock resistance test , The effects of different thermal shock times and TaC content on the mechanical properties of sintered tungsten block were studied. The results showed that the relative density of sintered tungsten block decreased with the increase of thermal shock frequency. The relative density of the sample reached the lowest when the impact was 150 times. The relative density first increased and then decreased with the increase of TaC content. After thermal shock, the Vickers hardness and flexural strength all increase, and the Vickers hardness increases with the increase of TaC content. When the content of TaC is 4%, the sintered tungsten has the highest hardness (1300 HV0. 1/10).