刘延宽,王志平,丁坤英.WC-17Co 粉末尺寸对粒子飞行状态与涂层性能的影响分析[J].表面技术,2016,45(6):76-81.
LIU Yan-kuan,WANG Zhi-ping,DING Kun-ying.Effect of Particle Size on the In-flight Characteristics and the WC-17Co Coating Properties[J].Surface Technology,2016,45(6):76-81 |
| WC-17Co 粉末尺寸对粒子飞行状态与涂层性能的影响分析 |
| Effect of Particle Size on the In-flight Characteristics and the WC-17Co Coating Properties |
| 投稿时间：2016-01-22 修订日期：2016-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.06.012 |
| 中文关键词: 超音速火焰喷涂 碳化钨-17 钴 焰流特性 粒子飞行状态 涂层 孔隙率 努氏硬度 |
| 英文关键词:WC-17Co flow characteristic particle in-flight characteristic coating porosity Knoop hardness |
| 基金项目:工信部重大专项资助项目（2011ZX04014-21）；中央高校基金资助项目（ZXB2011A005） |
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| 中文摘要: |
| 目的 提高碳化钨涂层的性能。 方法 运用 Fluent 软件进行超音速火焰喷涂焰流的仿真模拟，得出喷涂距离-焰流速度、喷涂距离-焰流温度曲线。采用粒子飞行监测仪对三组不同粒度（粒子平均直径分别为 21.72、 32.92、 42.56 μm） WC-17Co 粉末在超音速火焰喷涂过程中的飞行状态进行监测，并得出喷涂距离-速度、喷涂距离-温度曲线，揭示喷涂过程中焰流速度、温度对粒子速度和温度的影响。通过扫描电镜观察分析不同粒度 WC-17Co 粉末撞击镍 718 合金基体后的扁平化程度，测量不同粒度WC-17Co 涂层的孔隙率，比较涂层致密度的差异，同时采用压痕法测量涂层的硬度。 结果 WC-17Co粒子飞行速度和温度随喷涂距离的增加呈先增大后减小的趋势，且粒子飞行速度和温度随粉末粒径的增大而减小，根据粉末粒径的不同，其速度峰值在 690~810 m/s 之间变化，温度峰值在 1890~2050 ℃之间变化。直径越小的粒子撞击基体后的扁平率越高，扁平率在 1.94~2.35 之间。 WC-17Co 涂层的孔隙率随粒子直径的增大而升高，涂层的硬度与孔隙率成反比，涂层努氏硬度在 1072~1284HK 之间。结论 超音速火焰喷涂过程中，碳化钨粉末的飞行速度和温度呈先增大后减小的趋势，且飞行速度和温度与粒子直径大小成反比。碳化钨涂层的致密度与硬度随粒子直径的增大而减小。 |
| 英文摘要: |
| Objective To improve WC-coating properties. Methods Fluent software was used to simulate the flame of the high velocity oxygen fuel (HVOF), curves of distance-velocity and distance-temperature of flame were obtained, HVOF in-flight characteristics of WC-17Co powder in 3 different sizes (with average diameters of 21.72 μm, 32.92 μm, 42.56 μm, respectively) was monitored using spray watch, curves of distance-velocity and distance-temperature of WC-17Co powder were obtained, and the effect of flame velocity and temperature on the velocity and temperature of WC-17Co particles was revealed. The splatting and flattening ratio of WC-17Co powder was studied using SEM, the coating porosity of different powder sizes was measured and the compactness was compared, meanwhile, the coatings′ hardness was measured using indentation method. Results The WC-17Co powder′s velocity and temperature increased first and then decreased along with the spray distance, the velocity and temperature values decreased with increasing particle size, depending on different particle sizes, the peak velocity varied from 690 m/s to 810 m/s and the peak temperature ranged from 1890 ℃ to 2050 ℃; smaller particles had a higher flattening ratio after the impact on nickel alloy base, and the ratio varied from 1.94 to 2.35; WC-17Co coating porosity increased with increasing particle size, nevertheless, the Knoop hardness decreased, with values between 1072HK to 1284HK. Conclusion The WC-17Co powder’s velocity and temperature increased first and then decreased during the process of HVOF, and were negatively correlated to the particle diameter; the compactness and Knoop hardness decreased along with the increase of particle diameter. |
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