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鎂對氫化鈦燒結(jié)致密化的影響
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國家自然科學(xué)基金（51274039）；新金屬材料國家重點實驗室開放基金（2012-ZD04）


Effect of Magnesium on the Densification Behavior of Titanium Hydride
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    摘要:

    以氫化鈦粉末和鎂粉為原料，利用模壓工藝制備純鈦，主要研究了鎂對氫化鈦粉末燒結(jié)致密化的影響。結(jié)果表明，少量鎂的添加能夠促進氫化鈦粉末的燒結(jié)致密化，而過量鎂則降低燒結(jié)密度，鎂添加量為0.5%（質(zhì)量分數(shù)，下同）時效果最優(yōu)，將燒結(jié)體相對密度由96.5%提高到98.7%。通過對燒結(jié)過程動力學(xué)、鎂還原氧化鈦反應(yīng)的熱力學(xué)和動力學(xué)，以及燒結(jié)體成分進行分析，發(fā)現(xiàn)少量鎂促進氫化鈦燒結(jié)致密化的機理為：真空燒結(jié)時鎂從坯體中揮發(fā)，形成的鎂蒸氣對粉末顆粒表面的氧起到凈化作用，提高了燒結(jié)活性，從而提高燒結(jié)密度。

    Abstract:

    Using titanium hydride powder and magnesium powder as starting materials, pure titanium was prepared by the press-sintering process. Magnesium was used as the addition and its effect on the sintering densification behavior of titanium hydride were studied. The results show that a bit of magnesium could accelerate the densification process, while excessive magnesium decreases the relative density. The optimal amount of magnesium is 0.5 wt% and the relative density is improved from 96.5% to 98.7%. By investigating the sintering kinetics, thermodynamics and kinetics of titanium dioxide reduction by magnesium and EDS element mapping analysis of the sintered sample, the densification mechanism was clarified. In the sintering process, magnesium volatilizes from the green body and the magnesium vapor reduces the oxidation film of the powder particles, thus improving the sintering activity and enhancing the sintered density.

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葉 青,郭志猛,蘆博昕,柏鑒玲,邵慧萍,郝俊杰,林均品.鎂對氫化鈦燒結(jié)致密化的影響[J].稀有金屬材料與工程,2015,44(5):1214~1218.[Ye Qing, Guo Zhimeng, Lu Boxin, Bai Jianling, Shao Huiping, Hao Junjie, Lin Junpin. Effect of Magnesium on the Densification Behavior of Titanium Hydride[J]. Rare Metal Materials and Engineering,2015,44(5):1214~1218.]
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  • 收稿日期:2014-05-11
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  • 在線發(fā)布日期: 2015-06-08
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