铁基WC包埋复合材料致密化与相形成动力学

Esteban A. Álvarez , Carlos J.R. González Oliver , José Luis García
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引用次数: 3

摘要

本文给出了与WC-Fe复合材料致密化相对应的结果。将商用WC (4NPO H.C. Starck)与从溶胶-凝胶法获得的前驱体中添加的铁(Fe)混合。本文还报道了通过溶胶-凝胶途径获得的材料相形成动力学的结果,该方法涉及W, Fe和C的几种前驱体,加上胶体氧化铝(Al2O3)的添加。不同Fe浓度的样品,在温度为1230°C的垂直膨胀仪上进行研究,10% H2-Ar气体流量为800°C,然后在30mTorr的真空中进行研究,直到最终温度。根据选定的实验数据的动力学分析来讨论致密化,以确定所涉及的不同机制。这些样品进行x射线衍射鉴定所得相,其中WC和W是主要相。另一方面,在含有铁和氧化铝的溶胶-凝胶途径制备的样品在10% H2-Ar气氛下处理,以分析在500至800°C温度范围内产生的转变。XRD研究表明形成了不同的相,如WC(主要感兴趣的)和亚碳化物M6C型:W3Fe3C等。所有衍射图的分析表明,系统的演化是温度的函数,首先导致系统中的氧化(FeWO4的形成)和还原(Fe的形成)。该体系的同时质量损失显示在500-800°C的相同范围内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Densification and Phase Formation Kinetics in Composite Materials of WC Embedded in an Fe-Matrix

This paper presents results corresponding to the densification of WC-Fe composites. Commercial WC (4NPO H.C. Starck) was mixed with iron (Fe) added from a precursor obtained via sol-gel route. Results of the kinetics of phase formation in materials obtained via this sol-gel route, which involves several precursors of W, Fe and C, plus the addition of colloidal alumina (Al2O3) are also reported. Samples with different concentrations of Fe were studied using a vertical dilatometer up to 1230 °C with 10% H2-Ar gas flow up to 800 °C, and then in vacuum of 30mTorr until the final temperature. Densification is discussed in terms of kinetics analysis of selected experimental data to identify the different mechanisms involved. These samples were subjected to X-ray diffraction to identify the resulting phases, where WC and W were the main phases. On the other hand, samples prepared from a sol-gel route containing Fe and alumina were treated under an atmosphere of 10% H2-Ar, in order to analyze the transformations produced in the temperature range 500 to 800 °C. XRD studies indicated the formation of different phases, such as WC (of primary interest), and the subcarbide M6C type: W3Fe3C, among others. The analysis of all diffractograms indicates the evolution of the system as a function of temperature, leading first to oxidation (formation of FeWO4) and reductions (formation of Fe) in the system. Simultaneous mass losses of this system are shown in the same range of 500-800 °C.

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