3AlC2; 反應(yīng)機(jī)理; 燒結(jié)行為"/>

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Ti3AlC2材料的反應(yīng)合成及其燒結(jié)行為
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合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院,合肥工業(yè)大學(xué)材料科學(xué)與工程學(xué)院

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基金項(xiàng)目:

1. 國(guó)家自然科學(xué)基金（項(xiàng)目批準(zhǔn)號(hào)：51571078）；2.國(guó)家高技術(shù)研究發(fā)展計(jì)劃（863計(jì)劃，項(xiàng)目批準(zhǔn)號(hào)：2013AA051402）


Reactive synthesis of polycrystalline Ti3AlC2 and its sintering behavior
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School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China,School of Materials Science and Engineering,Hefei University of Technology;China

Fund Project:

1. National Natural Science Foundation of China (Grant No. 51571078)；2. National High-Tech Research and Development Project Program of China (863 Program) (Grant No. 2013AA051402).

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    摘要:

    以Ti，Al和TiC為原材料，用無(wú)壓煅燒合成法制備三元化合物Ti3AlC2。詳細(xì)討論了煅燒溫度和鋁含量對(duì)多晶Ti3AlC2純度的影響。利用X射線衍射儀、場(chǎng)發(fā)射掃描電鏡和場(chǎng)發(fā)射透射電鏡研究了粉末材料的組織結(jié)構(gòu)、晶粒大小、層板厚度和選區(qū)電子衍射花樣。結(jié)果表明1300℃是合成Ti3AlC2粉末的最佳煅燒溫度，1:1.2:2是Ti/Al/TiC原材料的最佳摩爾比。用熱壓法制備了不同燒結(jié)溫度下的Ti3AlC2塊體試樣，在1300℃熱壓制備的Ti3AlC2塊體的相對(duì)密度可達(dá)99.9%，其維氏硬度和三點(diǎn)抗彎強(qiáng)度分別為5.7 GPa和630 MPa。通過(guò)場(chǎng)發(fā)射掃面電鏡觀察材料的斷口形貌，進(jìn)一步分析了Ti3AlC2塊體材料的強(qiáng)化機(jī)理。

    Abstract:

    A method for fabrication of ternary compound Ti3AlC2 powder by presureless calcining (PC) technique was developed. Powders of Ti, Al and TiC were mixed as staring materials. The effect of calcining temperatures and aluminum content on the purity of Ti3AlC2 was discussed in detail. The reaction mechanism and the microstructure evolution of Ti3AlC2 prepared at different temperature were investigated by X-ray diffraction, field emission scanning electron microscopy and high resolution transmission electron microscopy. Results indicate that the single-phase polycrystalline Ti3AlC2 powder was obtained at 1300 ℃, which perform a typical laminated structure, and the best molar ratio of raw Ti/Al/TiC materials was 1:1.2:2. The bulk samples sintered by hot pressing were using the Ti3AlC2 powder. After hot pressing of different temperature, the fully dense of bulk Ti3AlC2 showed the best properties prepared at 1300 ℃. The density of bulk Ti3AlC2 reached to 99.9%. The average Vickers hardness was around 5.7 GPa, and the maximum flexural strength was over 630 MPa. Finally the strengthening mechanism of the bulk Ti3AlC2 was also proposed.

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湯海,鳳儀,黃曉晨,豆亞坤,丁冬冬,夏夢(mèng),田沛,錢剛,張學(xué)斌. Ti3AlC2材料的反應(yīng)合成及其燒結(jié)行為[J].稀有金屬材料與工程,2017,46(8):2108~2113.[Tang Hai, Feng Yi, Huang Xiao-chen, Dou Ya-kun, Ding Dong-dong, Xia Meng, Tian Pei, Qian Gang, Zhang Xue-bin. Reactive synthesis of polycrystalline Ti3AlC2 and its sintering behavior[J]. Rare Metal Materials and Engineering,2017,46(8):2108~2113.]
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  • 收稿日期:2015-08-13
  • 最后修改日期:2015-09-18
  • 錄用日期:2015-10-15
  • 在線發(fā)布日期: 2017-11-16
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