钛合金表面激光熔敷Ti2Ni3Si/NiTi耐磨涂层组织与耐磨性能

Microstructure and Wear Resistance of Laser Clad Ti2Ni3Si/NiTi Intermetallic Coatings on Titanium Alloy

摘要:

以Ti-50Ni-10Si合金粉末为原料，利用激光熔敷技术在钛合金BT9基材表面制得由Ti2Ni3Si初生树枝晶和枝晶间Ti2Ni3Si／NiTi共晶组织组成的耐磨材料涂层，研究了涂层的显微组织及室温耐磨性能。结果表明，该涂层在室温干滑动磨损条件下具有优异的耐磨性能和良好的载荷特性。

Abstract:

Wear resistant TieNi3Si reinforced intermetallic coatings were fabricated on a substrate of titanium alloy BT9 by laser cladding using Ti-50Ni-10Si alloy powders as the precursor materials. Results indicate that the laser clad intermetallic comings have a rapidly solidified homogeneous microstructure consisting of TieNi3Si primary dendrites and TieNi3Si/NiTi eutectic. Wear resistance of the laser clad Ti2Ni3Si reinforced intermetallic coatings was evaluated under dry sliding wear test conditions at room temperature. Because of the high hardness and strong covalent dominant atomic bonds of the Ti2Ni3Si primary dendrites with MgZn2 type Laves crystal structure and the high yield strength and toughness of the eutectic, the Ti2Ni3Si/NiTi intermetallic coatings have excellent wear resistance under dry sliding wear test conditions.