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旋鍛法制備高摻雜ThO2納米顆粒的W熱陰極材料的結(jié)構(gòu)與性能
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TG146.411

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國家自然科學(xué)基金資助項目(50071043),西安交通大學(xué)博士論文基金資助項目(DFXJU2000-1)


Characteristics and Microstructure of High Doping Nanocomposite W-ThO2 Thermionic Cathode Material by Swaging Method
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    摘要:

    采用熱旋鍛工藝制備了納米復(fù)合W-4．5％ThO2陰極材料，為了對其抗燒蝕性能進(jìn)行研究，在氬弧焊機(jī)(GTA)上與商用W-2％ThO2和W-4．5％ThO2電極進(jìn)行了比較試驗。結(jié)果表明，這種新型電極的密度接近于全致密，其組織結(jié)構(gòu)與目前工藝生產(chǎn)的商用電極完全不同，粒徑小于20Onm的ThO1顆粒彌散分布于鎢基體晶粒內(nèi)。納米復(fù)合W-4．5％ThO2陰極材料的起弧性能是3種測試電極中最好的，抗燒蝕性能得到明顯改善，說明電極的性能主要受ThO2含量和粒度的支配。

    Abstract:

    By hot swaging, the nanocomposite W-4.5%ThO2 cathode was fabricated. A comparative study on the anti-erosion ability for a conventional W-2%ThO2, W-4.5%ThO2 cathode and a nanocomposite W-4.5%ThO2 cathode has been made by using gas-tungsten arc (GTA) welding. The results indicated that the relative density of the nanocomposite material is near full. The microstructure of the nanocomposite cathode is quite different from that of conventional thoriated tungsten cathodes. Most of the thoria particles in the nanocomposite are less than 200 nm in diameter, and situated on the tungsten grain boundaries. The arc starting characteristic of the nanocomposite W-4.5%ThO2 electrode is the best among the three cathodes. The cathode tip shape after arc burning was obseved. The results show that the anti-erosion ability of the nanocomposite W-4.5%ThO2 cathode had been obviously improved, which indicated that the cathode characteristics depend mainly on the content and partcle size of thoria.

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王發(fā)展 諸葛飛 張暉 丁秉鈞.旋鍛法制備高摻雜ThO2納米顆粒的W熱陰極材料的結(jié)構(gòu)與性能[J].稀有金屬材料與工程,2004,33(5):468~472.[Wang Fazhan, Zhuge Fei, Zhang Hui, Ding Bingjun. Characteristics and Microstructure of High Doping Nanocomposite W-ThO2 Thermionic Cathode Material by Swaging Method[J]. Rare Metal Materials and Engineering,2004,33(5):468~472.]
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  • 最后修改日期:2002-10-08
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