Spark plasma sintering of the nonstoichiometric ultrafine-grained titanium carbides with nano superstructural domains of the ordered carbon vacancies
Spark plasma sintering of the nonstoichiometric ultrafine-grained titanium carbides with nano superstructural domains of the ordered carbon vacancies
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具有有序碳空位纳米超结构域的非化学计量超细晶碳化钛的放电等离子烧结
DOI：
10.1016/j.matchemphys.2011.06.048
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发表时间：
2011-10-17
影响因子：
4.6
通讯作者：
Liu, Zhongyuan
中科院分区：
文献类型：
--
作者：
Xiang, JianYong;Hu, WenTao;Liu, Zhongyuan
我们在这里报道了非化学计量比超细晶TiCx的放电等离子烧结（SPS），同时形成有序碳空位。SPS烧结的TiCx表现出有趣的层状结构，晶粒的平均尺寸接近250 nm。发现C亚晶格中有序空位的立方超结构存在于纳米畴中。随着碳含量的增加，所观察到的超结构畴尺寸的快速下降表明，碳空位的有序长度强烈地依赖于碳含量或空位浓度。与无序碳空位的情况相比，由于有序碳空位的存在，观察到大大增强的压缩强度。(C)2011爱思唯尔有限公司版权所有。
We report here spark plasma sintering (SPS) of the nonstoichiometric ultrafine-grained TiCx with the simultaneous formation of ordered carbon vacancies. The SPS-sintered TiCx exhibits interesting laminar microstructure with grains of similar to 250 nm in average size. The cubic superstructure of the ordered vacancies in the C sublattice is found to exist in nano domains. With the increase of carbon content, the observed quick drop in the superstructural domain size indicates that the ordering length of the carbon vacancies depends strongly on the carbon content or the vacancy concentration. In comparison to the case of disordered carbon vacancies, the greatly enhanced compressive strength is observed due to the presence of ordered carbon vacancies. (C) 2011 Elsevier B.V. All rights reserved.