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粉末粒度對(duì)SPS固相燒結(jié)La0.6Eu0.4B6陰極材料的影響
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國(guó)家自然科學(xué)基金項(xiàng)目(50871002)


Effect of Particle Size on the Solid-Phase Sintered Polycrystalline La0.6Eu0.4B6 Cathode Prepared by Spark Plasma Sintering
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    摘要:

    采用高能球磨法制備出La0.6Eu0.4B6納米粉體，將球磨后的納米粉進(jìn)行放電等離子（SPS）燒結(jié)，制備出了高致密的La0.6Eu0.4B6多晶塊體材料。系統(tǒng)研究了燒結(jié)溫度、燒結(jié)壓力對(duì)樣品致密度和力學(xué)性能的影響。結(jié)果表明，該方法與傳統(tǒng)熱壓燒結(jié)方法相比有效降低了燒結(jié)溫度，制備出的樣品密度、維氏硬度和抗彎強(qiáng)度分別達(dá)到4.71 g/cm3、23.37 GPa和295.14 MPa，這些值均高于傳統(tǒng)熱壓燒結(jié)方法。熱電子發(fā)射結(jié)果表明，當(dāng)陰極溫度為1873 K時(shí)，最大發(fā)射電流密度為33.74 A/cm2。實(shí)驗(yàn)過(guò)程中還發(fā)現(xiàn)，在相同燒結(jié)工藝下，球磨納米粉與粗粉相比，維氏硬度、抗彎強(qiáng)度和熱電子發(fā)射電流密度分別提高了28%、58%和32%。因此，在固相燒結(jié)過(guò)程中，粉末粒度的減小，更有助于燒結(jié)性能的提高。

    Abstract:

    The La0.6Eu0.4B6 nanopowders were prepared by high-energy ball milling, and then the ball-milled nanopowder were used to prepare the high-density La0.6Eu0.4B6 polycrystalline bulks by spark plasma sintering (SPS). The influence of sintering temperature and pressure on the sample density and mechanical properties were investigated. The results show that this method reduces the sintering temperature more effectively than the conventional hot-pressing method. The sample density, Vickers hardness and flexural strength are 4.71 g/cm3, 23.37 GPa, and 295.14 MPa, respectively, which ??are also higher than those of conventional hot-pressing methods. The thermionic emission results show that when the cathode temperature is 1873 K, the maximum emission current density of La0.6Eu0.4B6 is 33.74 A/cm2. Under the same sintering condition, the Vickers hardness, flexural strength and thermionic emission current density of ball-milled nanopowder are increased by 28%, 58% and 32% compared with coarse-powder-sintered sample. These results indicate that refining the powder grain size to nano level is beneficial for reducing the sintering temperature and promoting the thermionic emission and mechanical properties.

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張 寧,張久興,包黎紅,魏永峰,李曉娜.粉末粒度對(duì)SPS固相燒結(jié)La0.6Eu0.4B6陰極材料的影響[J].稀有金屬材料與工程,2013,42(2):311~315.[Zhang Ning, Zhang Jiuxing, Bao Lihong, Wei Yongfeng, Li Xiaona. Effect of Particle Size on the Solid-Phase Sintered Polycrystalline La0.6Eu0.4B6 Cathode Prepared by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2013,42(2):311~315.]
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  • 收稿日期:2012-02-13
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