Modeling Calculation and Synthesis of Alumina Whiskers Based on the Vapor Deposition Process.

Wei Gong,Xiang-Cheng Li,Bo-Quan Zhu

doi:10.3390/ma10101192

Wei Gong, Xiang-Cheng Li + Show 1 more

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https://doi.org/10.3390/ma10101192

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Abstract

This study simulated the bulk structure and surface energy of Al2O3 based on the density of states (DOS) and studied the synthesis and microstructure of one-dimensional Al2O3 whiskers. The simulation results indicate that the (001) surface has a higher surface energy than the others. The growth mechanism of Al2O3 whiskers follows vapor–solid (VS) growth. For the (001) surface with the higher surface energy, the driving force of crystal growth would be more intense in the (001) plane, and the alumina crystal would tend to grow preferentially along the direction of the (001) plane from the tip of the crystal. The Al2O3 grows to the shape of whisker with [001] orientation, which is proved both through modeling and experimentation.

Highlights

Compared with fibers with diameters in the millimeter or micrometer scale, Al2 O3 whiskers with a sub-micrometer scale have the better advantages of high melting point, high specific strength, high specific modulus, high temperature oxidation resistance, and high chemical compatibility [1,2]
Results and the growth direction of alumina whiskers was depicted by TEM analysis
The. The surfaces surfaces of of (001), (001), (110),

Summary

Introduction

Compared with fibers with diameters in the millimeter or micrometer scale, Al2 O3 whiskers with a sub-micrometer scale have the better advantages of high melting point, high specific strength, high specific modulus, high temperature oxidation resistance, and high chemical compatibility [1,2].All these features give rise to the application of whiskers in the composite as a kind of excellent reinforcement phase in the fields of biology, aerospace, mechanics, polymers, and so on [3,4].For example, D. Compared with fibers with diameters in the millimeter or micrometer scale, Al2 O3 whiskers with a sub-micrometer scale have the better advantages of high melting point, high specific strength, high specific modulus, high temperature oxidation resistance, and high chemical compatibility [1,2]. All these features give rise to the application of whiskers in the composite as a kind of excellent reinforcement phase in the fields of biology, aerospace, mechanics, polymers, and so on [3,4]. Gonzalez-Lopez et al [5] found that the addition of about 3 wt. %

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