赵立英,李国太,吴清军,代洪川.氧燃比对爆炸喷涂 WC-12Co 涂层组织和力学性能的影响[J].表面技术,2016,45(1):131-136.
ZHAO Li-ying,LI Guo-tai,WU Qing-jun,DAI Hong-chuan.Effect of Oxygen-Fuel Ratio on the Microstructure and Mechanical Properties of WC-12Co Coating Deposited by Detonation Spraying Method[J].Surface Technology,2016,45(1):131-136 |
| 氧燃比对爆炸喷涂 WC-12Co 涂层组织和力学性能的影响 |
| Effect of Oxygen-Fuel Ratio on the Microstructure and Mechanical Properties of WC-12Co Coating Deposited by Detonation Spraying Method |
| 投稿时间：2015-08-19 修订日期：2016-01-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.01.021 |
| 中文关键词: 爆炸喷涂 氧燃比 碳化钨 涂层 组织 力学性能 疲劳寿命 |
| 英文关键词:detonation spraying oxygen-fuel ratio tungsten carbide coating structure mechanical properties fatigue life |
| 基金项目:国防科工局军品配套项目(JPPT-125-2-168) |
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| Author | Institution |
| ZHAO Li-ying | Kangtaiwei Advanced Material Co. Ltd, Foshan 528216, China |
| LI Guo-tai | Kangtaiwei Advanced Material Co. Ltd, Foshan 528216, China |
| WU Qing-jun | Guangdong Technical Center for Superhard and Electromagnetic Materials Researching, King-strong Material Engineering Co. , Ltd, Foshan 528216, China |
| DAI Hong-chuan | Kangtaiwei Advanced Material Co. Ltd, Foshan 528216, China |
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| 中文摘要: |
| 目的 提高直升机旋翼系统连接件的耐微动磨损疲劳寿命,解决传统镀铬工艺引起的环境污染问题。 方法 采用爆炸喷涂工艺,通过调节氧气和乙炔混合气体氧燃比,在 35Ni4Cr2MoA 高强合金钢基体上制备不同的 WC-12Co 涂层,研究氧燃比对涂层组成、结构和力学性能的影响规律。 结果 随着氧燃比的提高,涂层 C 含量逐渐降低,硬度、致密性、弹性模量和结合强度则先升后降。 氧燃比低于1. 1 时,粒子飞行速度低和熔融不充分是涂层硬度和致密性下降的主要原因;氧燃比高于 1. 3 时,爆炸焰流为氧化气氛,WC 粒子的氧化和分解加剧了 C 元素的流失,使得涂层性能下降;氧燃比为 1. 2 时,涂层无明显氧化和脱碳,截面维氏显微硬度(HV0. 3)达到 12. 9 GPa,孔隙率为 0. 86% ,与基材间的结合强度达到 148 MPa。 结论 爆炸喷涂中高速飞行的粒子对 35Ni4Cr2MoA 高强合金钢基体具有一定的表面强化作用,喷丸试棒经爆炸喷涂工艺沉积 WC-12Co 涂层后,疲劳寿命提高 107. 4% 。 氧燃比对爆炸喷涂沉积 WC-12Co 涂层的组成、结构和力学性能影响较大,氧燃比为 1. 2 时,涂层的综合力学性能最佳。 |
| 英文摘要: |
| Objective To improve the fretting wear fatigue resistant life of the helicopter rotor system connector and solve the environmental pollution problem caused by the traditional chrome plating craft. Methods By optimizing the oxygen-fuel ratio of oxygen and acetylene mixture, WC-12Co coating with high hardness and dense structure was deposited on the 35Ni4Cr2MoA high-strength steel substrate using the detonation spraying method. Influence of oxygen-fuel ratio on the composition, structure and mechanical property of the coatings was researched. Results The results showed that the carbon content of the coating decreased with increasing oxygen-fuel ratio. With the increase of the oxygen-fuel ratio, the hardness, density, elasticity modulus and bonding strength of the coating first increased and then decreased. When the oxygen-fuel ratio was less than 1. 1, the coating hardness and density decreased mainly due to the lower flight speed and insufficient melting of particles. When the oxygen-fuel ratio was more than 1. 3, oxidation and decomposition of WC particles in the oxidizing atmosphere of the explosion flame flow exacerbated the loss of carbon element. When the oxygen-fuel ratio was 1. 2, the coating showed no significant oxidation and decar-burization. The section Vickers hardness HV0. 3 reached 12. 9 GPa and the porosity was 0. 86% . The bonding strength between the coating and the substrate reached 148 MPa. Conclusion The high-speed particles in the process of explosion spraying had a surface strengthening effect on the 35Ni4Cr2MoA high-strength alloy steel substrate. After deposited WC-12Co coating using detonation spraying, the fatigue life of shot-peened test rod could be enhanced by 107. 4% . The oxygen-fuel ratio had a significant effect on the composition, structure and mechanical property of the WC-12Co coating deposited using the detonation spraying method. When the oxygen-fuel ratio was 1. 2, the coating showed no significant oxidation and decarburization and had an optimal comprehensive mechanical property. |
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