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SPS反應(yīng)燒結(jié)制備多元稀土硼化物陰極(SmxBa1-x)B6的晶體結(jié)構(gòu)及其表征
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國家自然科學(xué)基金（50871002）


Crystal Structure and Characterization of RE Multiple Boride Cathodes (SmxBa1-x)B6 Prepared by Reactive Spark Plasma Sintering
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    摘要:

    應(yīng)用直流電弧蒸發(fā)冷凝＋放電等離子燒結(jié)（SPS）法制備多晶(SmxBa1-x)B6（x = 0.2, 0.6, 0.8）塊體陰極。采用XRD、EBSD研究燒結(jié)體的相、晶體結(jié)構(gòu)及晶粒取向，并測試部分性能。結(jié)果表明，SPS液相反應(yīng)燒結(jié)制備的高純(SmxBa1-x)B6為單相結(jié)構(gòu)，屬無序替代固溶體，晶格常數(shù)隨Ba含量的增加而增加。(SmxBa1-x)B6燒結(jié)體的晶粒細(xì)小，致密度高，具有優(yōu)秀的力學(xué)性能。60 MPa，1400 ℃保溫5 min SPS燒結(jié)制備的(Sm0.2Ba0.8)B6及(Sm0.8Ba0.2)B6形成了有利于提高發(fā)射性能的絲織構(gòu)。

    Abstract:

    The polycrystalline (SmxBa1-x)B6 (x=0.2, 0.6, 0.8) bulk cathodes were synthesized by arc plasma and spark plasma sintering (SPS). The phase, crystal structure and grain orientations of sintered bodies were investigated with XRD and EBSD, and the partial properties were tested. The results indicate that the (SmxBa1-x)B6 with high-purity prepared by SPS are random substitution solid solutions which exhibit a single phase structure. The lattice parameters increase with the increase of Ba content. The (SmxBa1-x)B6 sintered bodies with a fine grain structure have high-density and excellent mechanical properties. The (Sm0.2Ba0.8)B6 and (Sm0.8Ba0.2)B6 sintered at 60 MPa and 1400 oC for 5 min form some fiber textures which will enhance the emitting property.

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周身林,張久興,劉丹敏,包黎紅,馬汝廣,魏永峰. SPS反應(yīng)燒結(jié)制備多元稀土硼化物陰極(SmxBa1-x)B6的晶體結(jié)構(gòu)及其表征[J].稀有金屬材料與工程,2011,40(6):1045~1049.[Zhou Shenlin, Zhang Jiuxing, Liu Danmin, Bao Lihong, Ma Ruguang, Wei Yongfeng. Crystal Structure and Characterization of RE Multiple Boride Cathodes (SmxBa1-x)B6 Prepared by Reactive Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2011,40(6):1045~1049.]
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  • 收稿日期:2010-06-02
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