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Surface Modification of Alumina Ceramic with Mg2Al4Si5O18 Glass by a Sol-Gel Process

졸-겔 공정으로 합성된 코디어라이트를 이용하여 알루미나의 표면개질

  • Choi, Pil-Gyu (Department of Convergence Materials Science and Engineering, Changwon National University) ;
  • Chu, Min Cheol (Korea Research Institute of Standards and Science) ;
  • Bae, Dong-Sik (Department of Convergence Materials Science and Engineering, Changwon National University)
  • 최필규 (창원대대학교 나노.신소재공학과) ;
  • 추민철 (한국표준과학연구원) ;
  • 배동식 (창원대대학교 나노.신소재공학과)
  • Received : 2013.12.21
  • Accepted : 2014.01.06
  • Published : 2014.01.27

Abstract

The Mg-enriched magnesium aluminum silicate (MAS) glass is known for its higher mechanical strength and chemical resistance. Among such glasses, cordierite ($Mg_2Al_4Si_5O_{18}$) is well known to have a low thermal expansion and low melting point. Polycrystalline engineering ceramics such as alumina can be strengthened by a surface modification with low thermal expansion materials. The present study involves the synthesis of cordierite by a sol-gel process and investigates the effect of glass penetration on the surface of alumina. The cordierite powders were prepared from $Al(OC_3H_7)_3$, $Mg(OC_2H_5)_2$ and tetraethyl orthosilicate by hydrolysis and condensation reaction. The cordierite powders were characterized by X-ray diffraction (XRD, Rigaku), scanning electron microscope (SEM, JEOL: JSM-5610), energy dispersive spectroscopy (EDS, JEOL: JSM-5610), and universal testing machine (UTM, INSTRON). The X-ray diffraction patterns showed that the synthesized particles were ${\mu}$-cordierite calcined at $1100^{\circ}C$ for 1 h. The shape of synthesized cordierite was changed from ${\mu}$-cordierite to ${\alpha}$-cordierite with increasing calcination temperature. Synthesized cordierite was used for surface modification of alumina. Cordierite powders penetrated deeply into the alumina sample along grain boundaries with increasing temperature. The results of surface modification tests showed that the strength of the prepared alumina sample increased after surface modification. The strength of a surface modified with synthesized cordierite increased the most, to about 134.6MPa.

Keywords

Acknowledgement

Supported by : 창원대학교

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