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放電等離子燒結(jié)制備超細(xì)晶粒W-TiC復(fù)合材料
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國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目 (50634060)；國(guó)際熱核聚變實(shí)驗(yàn)堆 (ITER)計(jì)劃專項(xiàng)國(guó)內(nèi)配套項(xiàng)目 (2010GB109000)


Fabrication of Ultra Fine Grained W-TiC Composites by Spark Plasma Sintering
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    摘要:

    采用機(jī)械合金化和放電等離子燒結(jié) (SPS)技術(shù)制備了納米TiC顆粒彌散增強(qiáng)超細(xì)晶W-TiC復(fù)合材料，對(duì)超細(xì)晶W-TiC復(fù)合材料的顯微組織和室溫力學(xué)性能進(jìn)行了研究。研究表明，采用SPS工藝于1700 ℃下燒結(jié)1 min可獲得燒結(jié)顆粒結(jié)合良好，致密度高達(dá)約98.6%的超細(xì)晶W-TiC復(fù)合材料。通過(guò)添加納米TiC，不僅能抑制W晶粒的長(zhǎng)大，還能促進(jìn)W的致密化。當(dāng)TiC的加入量為0.7%時(shí) (質(zhì)量分?jǐn)?shù), 下同)可獲得晶粒尺寸為0.5 μm，抗彎強(qiáng)度和維氏硬度分別為1262 MPa, 6.45 GPa的超細(xì)晶W-TiC復(fù)合材料

    Abstract:

    Nano TiC particles dispersion strengthened ultra fine grained (UFG) W-TiC composites were fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). The microstructure and the room temperature mechanical properties of the W-TiC composites were studied. The results show that the well-combined and highly-densified (nearly 98.6%) UFG W-TiC composites can be obtained by SPS at 1700 oC for 1 min. The addition of the nano TiC can refine the grains of W, and accelerate its densification. The grain size, relative density, bending strength and the Vicker hardness HV0.2 of the UFG W-TiC composites are 0.5 μm, 98.6%, 1262 MPa and 6.45 GPa, respectively when the content of TiC is 0.7wt%.

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談 軍,周張健,屈丹丹,馬 垚,李 明.放電等離子燒結(jié)制備超細(xì)晶粒W-TiC復(fù)合材料[J].稀有金屬材料與工程,2011,40(11):1990~1993.[Tan Jun, Zhou Zhangjian, Qu Dandan, Ma Yao, Li Ming. Fabrication of Ultra Fine Grained W-TiC Composites by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2011,40(11):1990~1993.]
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  • 收稿日期:2010-11-30
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