CAJ | 학술논문

涂层内氧化物和孔隙等微观缺陷是影响涂层力学性能的关键因素，采用等离子喷涂技术制备TiN涂层，利用 SEM、XRD、EDS 分析喷涂参数对涂层内氧化物和孔隙率的影响，并研究氧化物和孔隙率对涂层硬度和断裂韧性的影响规律，优化等离子喷涂参数。结果表明：在较远喷涂距离和较大喷涂功率下，涂层内具有较少的氧化物和孔隙；随涂层内氧化物和孔隙增多，涂层硬度呈降低趋势；涂层内氧化物的存在可提高涂层的断裂韧性，但氧化物较多时会降低涂层层状结构内聚强度，涂层断裂韧性随氧化物增多呈现先增加后降低的变化趋势。
도층내양화물화공극등미관결함시영향도층역학성능적관건인소，채용등리자분도기술제비TiN도층，이용 SEM、XRD、EDS 분석분도삼수대도층내양화물화공극솔적영향，병연구양화물화공극솔대도층경도화단렬인성적영향규률，우화등리자분도삼수。결과표명：재교원분도거리화교대분도공솔하，도층내구유교소적양화물화공극；수도층내양화물화공극증다，도층경도정강저추세；도층내양화물적존재가제고도층적단렬인성，단양화물교다시회강저도층층상결구내취강도，도층단렬인성수양화물증다정현선증가후강저적변화추세。
Micro-defects such as oxides and pores are the main factors affecting the mechanical properties of TiN coatings prepared using plasma sprayed technology. The oxide content and porosity of the coatings were analyzed through SEM, XRD and EDS, whose effect on hardness and fracture toughness was also studied. It is shown that under the high spraying power and long spray distance, the TiN coatings has low oxide content and porosity, respectively. The hardness and fracture toughness decreases with the increasing of oxide content would and porosity. Meanwhile, the oxide phase can enhance the fracture toughness of TiN coatings. However, high oxide content would result in relatively low fracture toughness which can decrease the cohesive strength. The fracture toughness can increases and then reduces with increasing oxide.