Abstract:The effect of heat treatment on the hardness, wear resistance and structure of a coating material of 0.45%RE-Ni-4.8%B-6.2%Al2O3has been discussed. Results showed that the hardness and wear resistance of the composite material reached their optimal values when heating temperature rose to 350 and 500℃respectively. The crystalline process of the RE-Ni-B-Al2O3composite was: amorphous300~400℃　mixtureover 400℃　crystalline. X-ray diffraction and scanning electron microscopy indicated that the composite material was amorphous at the as-coated status. Sharp diffraction peaks of Al2O3particles appeared on the diffraction pattern, but the diffraction peaks of RE did not appear because of its low content. The crystalline temperature of Ni-B alloy increased when RE and Al2O3particles were inserted. The hardness and wear resistance of the composite increased obviously with the addition of RE and Al2O3particles.

Key words: RE-Ni-B-Al2O3　composite material　coating material　amorphous　crystalline