TiO2-Al-C混合物露天燃烧和负载烧结制备TiC-Al2O3复合陶瓷的结构和性能的特殊性

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
Amel Bourbia, Samia Lemboub, Azzedine Boudebane, Said Graini, Said Boudebane, Soumaya Meddah
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引用次数: 0

摘要

采用露天燃烧法制备了复合铝热TiO2-Al-C混合物,然后烧结制备了TiC-Al2O3基陶瓷。为此,采用常规粉末冶金方法制备了[TiO2-Al-C]、[TiO2 + Al + (90%C + 10%B)]、[TiO2 + (90%Al + 10%Mg) + C]和[(90%TiO2 + 10%SiO2) + Al + C]的粉末混合物。将燃烧产物粉碎筛分,回收小于40µm的馏分。不同的陶瓷粉末混合物首先进行冷单轴压缩,然后在2023 K下进行烧结,循环载荷为50 MPa,施加2.4 ks。x射线衍射分析表明,样品中存在TiC、Al2O3和Al2TiO5尖晶石。露天燃烧伴随着铝的蒸发,未还原的TiO2的存在,以及在烧结过程中生成Al2TiO5尖晶石的新氧化物如Ti3O5和Ti4O7的形成。显微组织分析采用扫描电镜结合半定量评价,揭示了TiC、Al2O3和Al2TiO5组成的基本陶瓷结构。硼、镁或二氧化硅的加入产生了TiB2、MgAl2O4和Ti3SiC2等新相,改变了陶瓷的结构和成分。因此,铝热混合物的组成对所研究陶瓷的结构、硬度、微压痕结果和摩擦学行为有显著影响。因此,含33.81wt的陶瓷的磨损率和摩擦系数最低。% tic - 51.73 wt。%氧化铝- 3.42 wt。% al2tio5 - 11.04 wt。% Ti3SiC2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Particularities of the structure and properties of TiC-Al2O3 complex ceramics obtained by combustion in open-air of TiO2-Al-C mixtures and sintering under load

Particularities of the structure and properties of TiC-Al2O3 complex ceramics obtained by combustion in open-air of TiO2-Al-C mixtures and sintering under load

Particularities of the structure and properties of TiC-Al2O3 complex ceramics obtained by combustion in open-air of TiO2-Al-C mixtures and sintering under load

The combustion in open-air of complex aluminothermic TiO2-Al-C mixtures, followed by sintering was used to produce TiC-Al2O3 based ceramics. For this purpose, powders mixtures containing [TiO2-Al-C], [TiO2 + Al + (90%C + 10%B)], [TiO2 + (90%Al + 10%Mg) + C] and [(90%TiO2 + 10%SiO2) + Al + C], were prepared via the conventional powder metallurgy route. The combustion product was crushed and sieved in order to recover the fractions less than 40 µm. The different mixtures of ceramic powders first underwent cold uniaxial compression followed by a sintering at 2023 K, under a cyclic load of 50 MPa applied for 2.4 ks. X-ray diffraction analysis of the samples revealed the presence of TiC, Al2O3 and Al2TiO5 spinel. The combustion in open-air is accompanied by an evaporation of aluminum, the presence of unreduced TiO2 and the formation of new oxides such as Ti3O5 and Ti4O7 which generate Al2TiO5 spinel during the sintering. Microstructural analyses using a scanning electron microscope combined with semi-quantitative evaluation revealed the basic ceramic structure composed of TiC, Al2O3 and Al2TiO5. The additions of boron, magnesium or silica generate new phases such as TiB2, MgAl2O4 and Ti3SiC2 modifying the structure and the ceramic composition. Finally, the aluminothermic mixtures composition therefore has a significant impact on the structure, hardness, micro-indentation results and tribological behavior of the ceramics studied. Thus, the lowest wear rate and friction coefficient were recorded on the ceramic containing 33.81wt.% TiC—51.73wt.% Al2O3—3.42wt.% Al2TiO5—11.04wt.% Ti3SiC2.

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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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