| Title |
Research Paper - Composite Materials - : Fabrication of Ni - coated Al2O3 / Al Matrix Composites by Oxide Dispersion Strengthening |
| Authors |
양태성(T . S . Yang); 강복석(B . S . Kang); 서영식(Y . S . Seo); 원창환(C . W . Won); 최진일(J . I . Choi) |
| Abstract |
The experimental results from the fabrication of AC4C/Ni-coated Al₂O₃ composites by oxide dispersion strengthening are summerized as follows; 1) Optimum condition obtained in Ni-Al₂O₃ composites powder preparation was molar ratio of NH₃/Ni^(++) 1.5 : 1, reduction temperature 130℃, stirring speed 600rpm, hydrogen partial pressure 350 psi and reduction time 60 mins. 2) Ni coating to Al₂O₃ surface improved wettability by decreasing surface tension of the matrix and particles. 3) The tensile strength, hardness and wear resistance increased with increasing the volume fraction and decreasing the particle size. In case of the tensile strength at 12vol.% was about 25% higher than that of matrix alloy(Al-2Cu-2Mg). |