Papers by Keyword: Thermal Expansivity

Abstract: The properties of in-situ (Si+Al₂O₃)/Al composites fabricated from Al-SiO₂ reaction system are investigated by X-Ray Diffraction, Scanning Electron Microscope and Differential Scanning Calorimetry technologies. The results indicate that the Si phase is plate shaped and the Al₂O₃ phase is mainly round and ellipsoidal. The composite prepared by this method have performances of low density, high conductivity and small thermal expansion coefficient (<10×10^-6/K) which meets the performance requirements of electronic packaging materials.

Abstract: NiAl and Ni₃Al intermetallic compound claddings are prepared by argon arc cladding technology on the 16Mn steel substrate. These claddings were oxidized for 100 hours at 850 and the oxide quality of each sample was recorded every 10 hours. The results show that the NiAl and Ni₃Al claddings have homogeneous structure and few defects, and form excellent metallurgical bonding with the matrix. The oxidation kinetics results show that, the oxidation weight gain rate of NiAl was more stable than Ni₃Al and tended to zero earlier. Oxide layer spallation of Ni₃Al cladding was more serious than that of NiAl cladding. Thus, NiAl argon arc cladding has the more excellent high temperature oxidation properties than Ni₃Al argon arc cladding.