TiC-Cu cermet的自蔓延高温合成溶解-沉淀机理研究

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"Dissolution-precipitation mechanism of self-propagating high-temperature synthesis of TiC-Cu cermet (2007年)" 论文主要研究了自蔓延高温合成（Self-Propagating High-Temperature Synthesis, SHS）过程中TiC-Cu金属陶瓷的溶解-沉淀机制。在SHS技术中，研究者使用了燃烧前沿淬火方法来研究TiC-Cu金属陶瓷的合成机制。这种方法允许他们观察淬火样品中的微观结构演变。通过扫描电子显微镜（Scanning Electron Microscope, SEM）配合能量色散X射线（Energy Dispersive X-ray, EDX）光谱分析，他们能够详细地了解合成过程的微观变化，并测量了合成反应的温度。实验结果显示，SHS反应首先由局部形成Ti-Cu合金熔体开始。这个过程可以被解释为一个溶解-沉淀机制。在这个过程中，Ti和C元素首先溶解在液态Cu中，随后在冷却过程中，过饱和的溶液会经历沉淀过程，析出TiC颗粒。这种沉淀发生在固态和液态相之间，形成了TiC颗粒与Cu基体的复合结构。这种微观结构对于理解和优化TiC-Cu金属陶瓷的性能至关重要，因为它直接影响材料的机械性能和热稳定性。 TiC-Cu金属陶瓷由于其优异的耐磨性、高温强度和良好的热导率，在航空航天、汽车工业以及切削工具等领域有着广泛的应用。通过深入理解SHS过程中的化学反应和微观结构演变，可以为设计和制备具有特定性能的金属陶瓷提供理论支持。论文作者包括Guoqing Xiao、Feng Duan、Gang Zhang和Quncheng Fan，分别来自西安建筑科技大学材料科学与工程学院和西安交通大学机械行为材料国家重点实验室。这项研究于2006年12月30日提交，并发表在2007年12月的北京科技大學学报第14卷第6期上，同时也可在科学直接数据库（ScienceDirect）上在线获取。该研究对理解SHS合成技术在金属陶瓷制造中的作用以及优化工艺参数具有重要意义。

Journal of University of Science and Technology Beijing

Volume 14, Number 6, December 2007, Page 1

Corresponding author: Guoqing Xiao, E-mail: xiaoguoqing@xauat.edu.cn Also available online at www.sciencedirect.com

Materials

Dissolution-precipitation mechanism of self-propagating

high-temperature synthesis of TiC-Cu cermet

Guoqing Xiao

, Feng Duan

, Gang Zhang

, and Quncheng Fan

1) School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

2) State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China

(Received 2006-12-30)

Abstract: A mechanism of self-propagating high-temperature synthesis (SHS) of TiC-Cu cermet was studied using a combustion

front quenching method. Microstructural evolution in the quenched sample was observed using a scanning electron microscope

(SEM) with energy dispersive X-ray (EDX) spectrometry, and the combustion temperature was measured. The results showed that

the combustion reaction started with a local formation of a Ti-Cu melt and could be described with a dissolution-precipitation me-

chanism, namely, Ti, Cu, and C particles dissolved into the Ti-Cu solution and TiC particles precipitated in the saturated Ti-Cu-C liq-

uid solution. The local formation of the Ti-Cu melt resulted from a solid diffusion between the Ti and Cu particles.

Key words: TiC-Cu cermet; self-propagating high-temperature synthesis; microstructural evolution; synthesis mechanism; combus-

tion front quenching method

1. Introduction

As a potential high-temperature electric conduct

material, TiC-Cu cermet is very attractive for a wide

range of potential applications because of its good

high-temperature electrical conductivity, mechanical,

and wear properties

[1-2].

In the past, TiC-metal cermet was prepared using

powder metallurgy

and casting technologies [3], where

TiC particles were directly incorporated into solid or

liquid matrices, respectively. Recently, a

self-propagating high-temperature synthesis (SHS)

technique, also termed combustion synthesis, is used

for the preparation of TiC-Cu cermet from Ti, C, and

Cu powders by some investigators

[4-5] because of its

advantages, such as simple equipment, the easily per-

formed process, low energy consumption, and non-

polluting traits.

These years, wide investigation on the SHS of met-

al matrix composites reinforced with TiC has been

carried out [4-11]. Zarrinfar [4] investigated the SHS

of TiC-Cu cermet from the elemental powder mixture

with the ratio of C/Ti from 0.4 to 1, and found that the

carbides produced differed from that predicted from

the initial SHS reactant mixture, and in the course of

the reaction, there were Ti-Cu intermetallics existing

and persisted as a final reaction product. Zarrinfar [5]

also prepared TiC-Cu master-alloys using the SHS

method, the experimental results indicated that

TiC-Cu master-alloys were produced by the reaction

synthesis of elemental powder mixtures, decreasing

the C/Ti ratio improved the distribution of the carbides

in the master-alloys. Till date, however, the mechan-

isms of combustion synthesis of TiC-Cu cermet are

not reported.

Observation of the microstructural transitions dur-

ing a combustion synthesis will be of benefit to the

understanding of the synthesis mechanism. Using a

combustion front quenching method (CFQM), Roga-

chev et al. [12] have observed the microstructural

transitions on Ti-C and Ti-B specimens. In the speci-

mens, the combusting waves self-propagating were

quenched, thus the initial, the intermediate, and the

end-reaction products were frozen in the quenched

sample, and then the microstructural evolutions in the

quenched samples were analyzed with scanning elec-

tron microscope (SEM) and energy dispersive X-ray

spectrometry (EDX).

In the present work, the mechanism of combustion

synthesis of TiC-Cu cermet was studied using the

CFQM method. The microstructural evolution in the

quenched specimen was observed and analyzed with

SEM and EDX, and the combustion temperature of

the reaction was measured. Also, the phase constituent

of the combustion-synthesized product was inspected

by X-ray diffraction (XRD). On the basis of these ex-

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