(裝甲兵工程學(xué)院 裝備再制造技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100072)
摘 要: 采用SEM、XRD、EDS、拉伸試驗(yàn)機(jī)及硬度儀，檢測(cè)不同氫氣流量下采用超音速微粒沉積技術(shù)制備的Al-12Si涂層形貌、相組成和力學(xué)性能，研究作為次燃料氣和還原氣的氫氣流量對(duì)涂層結(jié)構(gòu)和性能的影響。結(jié)果表明：提高氫氣流量能顯著提高顆粒的速度，利于顆粒沉積；氫氣流量為30 L/min時(shí)涂層最厚，但孔隙率最大；繼續(xù)增大氫氣流量，厚度減小，孔隙率降低；涂層由α(Al)相和Al-Si共晶相組成，氧含量隨氫氣流量增大而降低，未發(fā)現(xiàn)氧化物相；涂層結(jié)合強(qiáng)度超過34 MPa，硬度是基體硬度的2倍以上，結(jié)合強(qiáng)度和硬度均隨氫氣流量增大而增大，能夠顯著提升基體的耐磨性能。
關(guān)鍵字: Al-12Si涂層；氫氣；超音速微粒沉積；流量；涂層性能
（National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China）
Abstract:Adopting scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and tensile machine and hardness tester, the morphologies, phase constitutions and mechanical properties of Al-12Si coatings by supersonic particles deposition (SPD) at different hydrogen flow rates were detected, and the effect of the flow rate of hydrogen, which was treated as minor-fuel and reductive gas in the process of coating, on the structure and properties was studied. The results demonstrate that increasing the hydrogen flow rate can increase the velocity and deposition rate of the particles remarkably. The coating reaches the largest thickness and porosity when the hydrogen flow rate is 30 L/min, and the thickness and porosity tend to decrease with increasing hydrogen flow rate. The coating is composed of α(Al) phase and Al-Si eutectic phase, and the content of oxygen decreases with increasing the hydrogen flow rate, but oxidation phase is not discovered. The bonding strength is beyond 34 MPa, and the hardness of coating is twice more of substrate. The bonding strength and hardness increase with increasing the hydrogen flow rate, which can enhance the wear resistance of substrate notably.
Key words: Al-Si coating; H2; supersonic particles deposition; flow rate; coating properties
