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Research on Preheating of Titanium Alloy Powder in Electron Beam Melting Technology
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Research on Preheating of Titanium Alloy Powder in Electron Beam Melting Technology
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National Key Technologies R&D Program (2007BAE07B05)

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    摘要:

    研究了電子束熔化快速成形技術(shù)中的鈦合金粉末預(yù)熱工藝，并對(duì)粉末預(yù)熱后的顆粒聯(lián)接方式進(jìn)行了分析。結(jié)果表明，當(dāng)Ti6Al4V粉末由電子束連續(xù)掃描快速預(yù)熱升溫至600 ℃以上，粉末顆粒中高比表面積的細(xì)小顆粒，由于高能量密度電子束作用將全部或部分熔化而充當(dāng)粉末顆粒聯(lián)接團(tuán)聚的粘結(jié)劑，使得預(yù)熱區(qū)域的粉末顆粒聚團(tuán)結(jié)塊。該粉末團(tuán)聚體不僅能有效抵擋高速電子束流的沖擊而使熔化成形的表面粉末不飛濺，而且也能避免成形表面粉末顆粒熔化時(shí)的球化效應(yīng)。以Ti6Al4V粉末為原料并充分預(yù)熱每層的成形粉末，制備了層間熔合良好并且力學(xué)性能優(yōu)異的Ti6Al4V柱狀試樣。

    Abstract:

    The titanium alloy powder preheating process in electron beam melting (EBM) was investigated, and the connection mode among powder particles after preheating was analyzed. The results show that when the Ti6Al4V powder is preheated to above 600 °C during EBM process, a powder aggregation is formed. The sintering mechanism is that small particles partially or completely melt and play the role of binder to bond the majority of big particles together; this will be not only to help the particles to hold their places, withstanding the impact force of electron beam, but also to prevent the spheroidization effect in the prototyped surface. Using Ti6Al4V powder as starting material and adopting complete preheating of the powder layer, the column samples with full interlayer bonding and excellent mechanical properties are produced.

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賀衛(wèi)衛(wèi),賈文鵬,劉海彥,湯慧萍,康新婷,黃 瑜. Research on Preheating of Titanium Alloy Powder in Electron Beam Melting Technology[J].稀有金屬材料與工程,2011,40(12):2072~2075.[He Weiwei, Jia Wenpeng, Liu Haiyan, Tang Huiping, Kang Xinting, Huang Yu. Research on Preheating of Titanium Alloy Powder in Electron Beam Melting Technology[J]. Rare Metal Materials and Engineering,2011,40(12):2072~2075.]
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  • 收稿日期:2010-12-11
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