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Microstructure and Formation Mechanism of Porous Ti-Al Intermetallics Prepared by Pressureless Sintering
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中央高?；究蒲袠I(yè)務(wù)費(fèi)專項資金資助項目（2012QNA02）；國家自然科學(xué)基金資助項目（51202289）；金屬多孔材料國家重點(diǎn)實驗室開放課題基金資助（PMM-SKL-3-2012）；“青藍(lán)工程”（蘇教師〔2012〕39號）


Microstructure and Formation Mechanism of Porous Ti-Al Intermetallics Prepared by Pressureless Sintering
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    摘要:

    以Ti和Al 2種粉末為原料，采用粉末壓制-無壓燒結(jié)技術(shù)制備了TiAl多孔材料，并對其宏觀形貌、相組成、孔結(jié)構(gòu)、反應(yīng)機(jī)制和孔隙形成機(jī)理進(jìn)行了分析。結(jié)果表明：Ti-Al粉末壓坯在燒結(jié)過程中發(fā)生了明顯的體積膨脹，多孔材料的總孔隙率為49.88%~57.53%，開孔率為47.60%~56.15%。多孔材料主要由連續(xù)的顆粒骨架、骨架之間的大孔隙和骨架內(nèi)部的小孔隙構(gòu)成，孔隙主要來自粉末壓坯顆粒之間存在的原始大孔隙、無壓燒結(jié)過程中先熔化的Al顆粒在毛細(xì)作用下發(fā)生流動形成的原位大孔隙和析出過程在Ti-Al產(chǎn)物顆粒之間形成的小孔隙。Ti-Al多孔材料主要由TiAl3單相構(gòu)成，無壓燒結(jié)過程中Ti-Al之間發(fā)生了熱爆反應(yīng)。

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    Porous Ti-Al intermetallics materials were prepared form titanium and aluminum powders by pressureless sintering route, and the macro-morphology, phase composition, porosity, microstructure and formation mechanism of porous Ti-Al intermetallics were investigated. The results show that the volume expansion of the Ti-Al compacts is observed in all samples. The porosities of Ti-Al intermetallics are within the range of 49.88%~57.53%, and the open porosities are within the range of 47.60%~56.15%. The porous materials are made of interconnected skeleton, big pores among skeleton and small pores in the interior of skeleton. The interstitial pores in green powder compacts are the most important source of big pores of porous Ti-Al intermetallics, and the in-situ pores from the melting and flowing of aluminum powders is also significant to the formation of big pores. Small pores are from the precipitation of Ti-Al intermetallics particles in pressureless reactive sintering, and TiAl3 is the main phase of porous materials, and porous Ti-Al intermetallics are formed by thermal explosion mechanism.

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馮培忠,蘇 健,周亞國,王建忠,葛 淵,劉章生,王曉虹. Microstructure and Formation Mechanism of Porous Ti-Al Intermetallics Prepared by Pressureless Sintering[J].稀有金屬材料與工程,2015,44(11):2721~2727.[Feng Peizhong, Su Jian, Zhou Yaguo, Wang Jianzhong, Ge Yuan, Liu Zhangsheng, Wang Xiaohong. Microstructure and Formation Mechanism of Porous Ti-Al Intermetallics Prepared by Pressureless Sintering[J]. Rare Metal Materials and Engineering,2015,44(11):2721~2727.]
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  • 收稿日期:2014-11-20
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  • 在線發(fā)布日期: 2016-07-29
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