Microstructure and Wear Behaviour of Laser-Induced Thermite Reaction Al_2O_3 Ceramic Coatings on Pur

• 作 者: 黄开金
• 机 构: State Key Laboratory of Plastic Forming Simulation and Mould Technology Huazhong University of Scien
• 出 处: Journal of Wuhan University of Technology(Materials Science
• 发表日期: 2008年01期
• 关键词: sliding cladding melting ceramic Behaviour hardness AISI powders nominal evident

Wear-resistant laser-induced thermite reaction Al_2O_3 ceramic coatings can be fabricated on pure Al and AA7075 aluminum alloy by laser cladding(one-step method)and laser cladding followed by laser re-melting(two-step method)using mixed powders CuO-Al-SiO_2 in order to improve the wear properties of aluminum and aluminum alloy,respectively.The microstructure of the coatings was characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD).The wear resistance of the coatings was evaluated under dry sliding wear test condition at room temperature.Owing to the presence of hardα-Al_2O_3 andγ-Al_2O_3 phases,the coatings exhibited excellent wear resistance.In addition,the wear resistance of the coatings fabricated by two-step method is superior to that of the coatings fabricated by one-step method.

Wear-resistant laser-induced thermite reaction Al 2 O 3 ceramic coatings can be fabricated on pure Al and AA 7075 aluminum alloy by laser cladding (one-step method) and laser cladding followed by laser re-melting (two-step method) using mixed powders CuO- Al-SiO 2 in order to improve the wear properties of aluminum and aluminum alloy, respectively. The microstructure of the coatings was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The wear resistance of the coatings was evaluated under dry sliding wear test condition at room temperature. Owing to the presence of α-Al_2O_3 and γ-Al_2O_3 phases, the coatings exhibit excellent wear resistance. addition, the wear resistance of the coatings fabricated by two-step method is superior to that of the coatings fabricated by one-step method.