CAJ | 학술논문

采用超音速等离子喷涂法在调质45钢表面制备NiCr-Cr3C2金属陶瓷涂层，利用Spray Watch系统对喷涂过程中NiCr-Cr3C2粒子的分布状态、温度及速度等特性进行短时短距离的监测；并通过改变喷涂距离来改变喷涂粒子的特性，研究粒子特性对涂层的孔隙率、硬度与摩擦性能的影响。结果表明，在喷涂距离为90~120 mm范围内，粒子的速度与温度都相对较高，在喷涂距离为110 mm时，粒子的最大速度达到530 m/s，平均温度为2180℃。粒子温度过高或过低都不利于获得高质量涂层，但粒子速度越大，涂层质量越好。在喷涂距离为110 mm时，由于粒子速度大(平均为452 m/s)、温度适中(平均温度为2180℃)，沉积的NiCr-Cr3C2涂层结构致密，显微缺陷较少，具有较高的显微硬度和较低的孔隙率，分别为986 HV0.3和0.96%，并且摩擦性能较好，摩擦因数和磨损量都最小。
채용초음속등리자분도법재조질45강표면제비NiCr-Cr3C2금속도자도층，이용Spray Watch계통대분도과정중NiCr-Cr3C2입자적분포상태、온도급속도등특성진행단시단거리적감측；병통과개변분도거리래개변분도입자적특성，연구입자특성대도층적공극솔、경도여마찰성능적영향。결과표명，재분도거리위90~120 mm범위내，입자적속도여온도도상대교고，재분도거리위110 mm시，입자적최대속도체도530 m/s，평균온도위2180℃。입자온도과고혹과저도불리우획득고질량도층，단입자속도월대，도층질량월호。재분도거리위110 mm시，유우입자속도대(평균위452 m/s)、온도괄중(평균온도위2180℃)，침적적NiCr-Cr3C2도층결구치밀，현미결함교소，구유교고적현미경도화교저적공극솔，분별위986 HV0.3화0.96%，병차마찰성능교호，마찰인수화마손량도최소。
NiCr-Cr3C2 coating was deposited using supersonic plasma spray (SPS) system, and the Spray Watch system was used to monitor the particle distribution state, particle temperature and particle velocity. The coating porosity, micro-hardness and tribological property were tested to investigate the relationship between the sprayed particle character (achieved by changing the spray distance of the spray distance) and the coating property. Results show that, with increasing spray distance, the spray particle temperature and velocity increase first and then decrease; at the spray distance of 110 mm, the particle velocity reaches the highest value for 530 m/s and the average temperature is 2 180℃. In order to fabricate high quality coating, the sprayed particle temperature should not be too high or too low, while in terms of particle speed, the higher speed of sprayed particles, the higher of the quality is; at the spray distance of 110mm, the sprayed particle gains the best character of sprayed speed and temperature of 452 m/s and 2 180℃, respectively; the coating prepared at this distance has a dense micro-structure with little micro-defect, the micro-hardness and porosity are 986 HV0.3and 0.96%, respectively, and the friction peroperty is better with the least friction coefficient and volume loss.