화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.24, No.1, 48-52, January, 2014
DOI10.3740/MRSK.2014.24.1.48  Export Citation
졸-겔 공정으로 합성된 코디어라이트를 이용하여 알루미나의 표면개질
Surface Modification of Alumina Ceramic with Mg2Al4Si5O18 Glass by a Sol-Gel Process
최필규, 추민철1, 배동식†
  • 창원대대학교 나노·신소재공학과
  • 1한국표준과학연구원
Pil-Gyu Choi, Chu Min Cheol1, and Dong-Sik Bae†
  • Department of Convergence Materials Science and Engineering, Changwon National University, Changwon 641-773, Korea
  • 1Korea Research Institute of Standards and Science, Daejeon 305-340, Korea
E-mail:
The Mg-enriched magnesium aluminum silicate (MAS) glass is known for its higher mechanical strength and chemical resistance. Among such glasses, cordierite (Mg2Al4Si5O18) 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(OC3H7)3, Mg(OC2H5)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 μ-cordierite calcined at 1100 oC for 1 h. The shape of synthesized cordierite was changed from μ-cordierite to α-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:cordierite;sol-gel;crack healing;surface modification
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