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納米碳化鉭對(duì)SPS燒結(jié)鎢顯微結(jié)構(gòu)的影響
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國(guó)家磁約束核聚變能研究專項(xiàng)(2010GB109000)


Effect of Nano-TaC on Microstructure of Sintered Tungsten by SPS
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    摘要:

    通過(guò)放電等離子體燒結(jié) (SPS) 方法在1700 ℃下制備納米碳化鉭 (TaC) 彌散強(qiáng)化鎢塊，研究鎢粉原始粉末粒度大小和添加碳化鉭的量對(duì)燒結(jié)鎢塊微觀組織的影響。結(jié)果表明：不同粒度鎢粉 (30 nm、200 nm和3 μm) 制備的鎢塊，燒結(jié)后的粒徑隨原始粉末粒度的增大而增大，3 μm鎢粉燒結(jié)后的晶粒平均直徑為22.19 μm；同一種粒度鎢粉 (如200 nm)中分別添加質(zhì)量分?jǐn)?shù)為0%，1%，2%和4%的碳化鉭，燒結(jié)后鎢晶粒的平均直徑隨碳化鉭添加量的增加而減小，加入量為4%時(shí)晶粒平均直徑為5.91 μm。通過(guò)SEM分析可以看出，碳化鉭在燒結(jié)鎢中是以球形狀態(tài)存在的。從斷口可以看出，純鎢燒結(jié)體為穿晶斷裂，加入碳化鉭的鎢燒結(jié)體為晶間斷裂

    Abstract:

    Dispersion strengthened tungsten with nano-tantalum carbide (TaC) was prepared by Spark Plasma Sintering (SPS) process at 1700 ℃ for 1 min. The results show that the grain size of tungsten will be larger if the particle size of tungsten powder is larger. When the particle size of tungsten powder is 3 μm, the grain size of tungsten is 22.19 μm. And then, with the increase of TaC content, the grain size of tungsten will be finer. When the particle size of tungsten powder is 200 nm and the content of TaC is 4%, the grain size of sintered tungsten is about 5.91 μm. It also can be seen that TaC is spherical, it exists at grain boundaries of the sintered tungsten. Some transgranular fracture can be seen in fracture surface of pure tungsten by SPS, but it is mainly intergranular fracture in fracture surface of dispersion strengthened tungsten with nano-tantalum carbide

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張?zhí)O蘋,沈衛(wèi)平,周亞南,馬明亮,張慶玲,王青云.納米碳化鉭對(duì)SPS燒結(jié)鎢顯微結(jié)構(gòu)的影響[J].稀有金屬材料與工程,2012,41(8):1431~1434.[Zhang Pingping, Shen Weiping, Zhou Yanan, Ma Mingliang, Zhang Qingling, Wang Qingyun. Effect of Nano-TaC on Microstructure of Sintered Tungsten by SPS[J]. Rare Metal Materials and Engineering,2012,41(8):1431~1434.]
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  • 收稿日期:2011-08-16
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