CAJ | 학술논문

以 Ni-Al2 O3纳米复合镀层为中间涂层,在结晶器铜板表面激光熔覆 Co42粉末制备 Ni-Co-Al2 O3复合涂层,利用金相显微镜,扫描电镜、显微硬度仪及电化学腐蚀测试系统对涂层的微观组织、硬度及耐蚀性能进行了分析,研究结果表明,Ni-Al2 O3纳米复合镀层晶粒细小,微观组织致密、均匀.激光功率为4．5 kW,扫描速度为240 mm/min 时形成的激光熔覆层与基层形成了良好的冶金结合,激光熔覆层晶粒进一步细化,熔覆层的平均显微硬度高达1000 HV,耐蚀性能优良.
이 Ni-Al2 O3납미복합도층위중간도층,재결정기동판표면격광용복 Co42분말제비 Ni-Co-Al2 O3복합도층,이용금상현미경,소묘전경、현미경도의급전화학부식측시계통대도층적미관조직、경도급내식성능진행료분석,연구결과표명,Ni-Al2 O3납미복합도층정립세소,미관조직치밀、균균.격광공솔위4．5 kW,소묘속도위240 mm/min 시형성적격광용복층여기층형성료량호적야금결합,격광용복층정립진일보세화,용복층적평균현미경도고체1000 HV,내식성능우량.
Ni/Co/Al2 O3 composite coatings are prepared on the surface of mold copper plate with laser cladding of Co42 powders as cladding layer and Ni/Al2 O3 nanocomposte as interlayer,the microstructure,hardness and corrosion resistance of layers are analyzed by OM,SEM,microhardness tester and electrochemical system.The results indicate that Ni/Al2 O3 nanocomposte was compact and uniform with fine grain.Laser cladding layer. Under the condition of 4.5 kW laser power and 240 mm/min scanning speed,the laser cladding layer was metal-lurgical bonded to the substrate excellently,the grain of the laser cladding layer was refined,the laser cladding has a average microhardness value of 1 000 HV and excellent corrosion resistance.