Thermal plasma spheroidization of aluminum oxide and characterization of the spheroidized alumina powder

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2014-07-01 DOI:10.1016/j.ceramint.2014.01.026

Vandana Chaturvedi, P.V. Ananthapadmanabhan, Y. Chakravarthy, S. Bhandari, Nirupama Tiwari, A. Pragatheeswaran, A.K. Das

引用次数: 30

Abstract

Spheroidization of aluminum oxide powder was done by thermal plasma processing. The powder was injected into the plasma jet issuing out of a DC plasma torch. Trajectories of the particles in the plasma jet were seen using a high speed camera and then in-flight velocity and temperature of alumina particles were determined using a ‘Spray Watch’ system. Characterization of the spheroidized powder was done by Scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). The results showed that increase of the plasma torch power leads to increase in the extent of spheroidization and conversion to γ-alumina. Results obtained showed that the process can be extended to synthesize free flowing alumina powder for thermal spray applications.

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氧化铝的热等离子体球化及球化氧化铝粉体的表征

采用热等离子体对氧化铝粉末进行球化处理。将粉末注入直流等离子炬发出的等离子体射流中。使用高速摄像机观察等离子体射流中颗粒的轨迹，然后使用“喷雾观察”系统确定氧化铝颗粒的飞行速度和温度。采用扫描电子显微镜(SEM)和x射线粉末衍射仪(XRD)对球化粉末进行表征。结果表明，等离子炬功率的增加导致球化程度和γ-氧化铝转化程度的增加。结果表明，该工艺可推广到热喷涂用自由流动氧化铝粉末的合成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.