Effect of Ti_3SiC_2 Content on the Property of a Warm Compacted Cu-Ti_3SiC_2 Composite

摘要

A simple and economical powder metallurgy forming process known as warm compaction was employed to fabricate a Cu-Ti_3SiC_2 particulate reinforced copper matrix composite for electro-friction purpose. Copper matrix composites reinforced with 5, 10, 15 mass% Cu coated Ti_3SiC_2 particulate were prepared by compacting the powder mixture with a pressure of 700 Mpa at 145°C, and then sintered at 1000°C under cracked ammonia atmosphere for 60 minutes. Their density, hardness, tensile strength, elongation and electrical resistivity were studied. Result showed that within a reasonable limit, the addition of Ti_3SiC_2 particulate can increase the hardness of the composite without losing much of electrical conductivity. Sintered composite with 5 mass% Ti_3SiC_2 has an ultimate tensile strength of 182 Mpa with an elongation of 10%, a hardness of HB 68 and a resistivity of 8.0 × 10~(-8)Ωm. Compared with the samples using uncoated Ti_3SiC_2 particulate, the resistivity of the samples prepared by using the Cu coated Ti_3SiC_2 particulate have a better conductivity, but have a slightly lower mechanical property.