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基于TiCN和(Ti,W,Ta)CN的混芯結(jié)構(gòu)金屬陶瓷冶金過程中物相、組織結(jié)構(gòu)及力學(xué)性能演變
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四川大學(xué)材料科學(xué)與工程學(xué)院,四川大學(xué)材料科學(xué)與工程學(xué)院,四川大學(xué)材料科學(xué)與工程學(xué)院

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國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Evolution of phase, microstructure and properties of mulit-core cermets based on (Ti,W,Ta)CN and TiCN powders in sintering process
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Sichuan University，School of Materials Science and Engineering,Sichuan University，School of Materials Science and Engineering,Sichuan University，School of Materials Science and Engineering

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    本文研究了基于TiCN和(Ti,W,Ta)CN的混芯結(jié)構(gòu)金屬陶瓷冶金過程中的物相、組織結(jié)構(gòu)和力學(xué)性能。通過X射線衍射（XRD）和掃描電子顯微鏡（SEM）等分析手段，研究了“混芯結(jié)構(gòu)”金屬陶瓷的冶金行為，其大致可以分為三個(gè)階段：(I) 前致密化階段，燒結(jié)溫度低于1200℃；(II)快速致密化階段，燒結(jié)溫度于1200~1350℃之間；(III)最終致密化階段，燒結(jié)溫度高于1350℃。同時(shí)，本文還討論了η相在“混芯結(jié)構(gòu)”金屬陶瓷中的演變規(guī)律，并采用透射電子顯微鏡（TEM）中的X射線能量分光譜（XEDS）和選區(qū)電子衍射(SAED)等手段分析了其結(jié)構(gòu)和化學(xué)成分。此外，隨燒結(jié)溫度增加，金屬陶瓷中的環(huán)形結(jié)構(gòu)會(huì)逐漸增厚，材料的力學(xué)性能呈先出現(xiàn)增加后降低的趨勢。在燒結(jié)溫度達(dá)到1450℃時(shí)，材料具有最大的抗彎強(qiáng)度；而在燒結(jié)溫度為1390℃時(shí)，材料具有最大的硬度。

    Abstract:

    The phase, microstructure and properties of mulit-core cermets based on (Ti,W,Ta)CN and TiCN powders were investigated in sintering process. According the analyses of X-Ray diffraction (XRD) and scanning electron microscope (SEM), it indicated that the sintering behavior of the multi-core cermet in sintering process could be divided into three stages: (I) pre-densification stage (the sintering temperature < 1200 °C); (II) rapid densification stage (the sintering temperature between 1200 °C and 1350 °C); (III) final densification stage (the sintering temperature > 1350 °C). Meanwhile, the evolution of η-phase in multi-core cermet was discussed as well. Furthermore, the microstructural and chemical information of η-phase were studied by Transmission Electron Microscopy (TEM) using X-ray energy dispersive spectrometry (XEDS) and selected area electron diffraction (SAED). The thickness of the rim structure would increase with the rise of sintering temperature, while the mechanical properties of the material would firstly increase then decrease with the rise of sintering temperature, and achieve the highest transverse rupture strength at 1450°C, the highest hardness at 1390°C.

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引用本文

王杰,劉穎,葉金文.基于TiCN和(Ti, W,Ta)CN的混芯結(jié)構(gòu)金屬陶瓷冶金過程中物相、組織結(jié)構(gòu)及力學(xué)性能演變[J].稀有金屬材料與工程,2018,47(5):1385~1392.[Wang Jie, Liu Ying, Ye Jinwen. Evolution of phase, microstructure and properties of mulit-core cermets based on (Ti, W,Ta)CN and TiCN powders in sintering process[J]. Rare Metal Materials and Engineering,2018,47(5):1385~1392.]
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  • 收稿日期:2017-08-15
  • 最后修改日期:2017-10-16
  • 錄用日期:2017-11-09
  • 在線發(fā)布日期: 2018-06-08
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