以普通45#钢为基体,分别以FeAl晶体粉末和Al_(65)Cu_(20)Cr_(15)准晶粉末为热喷涂材料,采用超音速火焰喷涂(HVOF)方法制备涂层.使用金相显微镜和接触角测量仪分别对两种涂层的扁平粒子形态和表面润湿性进行表征,利用X射线衍射仪对准晶涂层的相结构进行分析.分别使用MH-6维氏硬度仪和MMW-1立式万能摩擦磨损试验机测量涂层的显微硬度HV和摩擦系数及磨损失重.结果表明:喷涂准晶涂层与原始粉末的相组成基本相同,都包括主相二十面体准晶I-Al_(65)Cu_(24)Cr_(11),和另外3种含量极少的晶体相,即θ-Al_(13)Cr_2(即Al_(83)Cu_4Cr_(13))、α-Al_(69)Cu_(18)Cr_(13)和ε-Al_2Cu_3;但是与原始准晶粉末相比,HVOF涂层中准晶相I-Al_(65)Cu_(24)Cr_(11)的体积含量相对减少,而另外3种晶体相含量相对增加.相同试验条件下,同FeAl为代表的常规金属晶体涂层相比,超音速火焰喷涂Al-Cu-Cr准晶涂层具有更低的摩擦系数和磨损量,而且对蒸馏水具有更大的接触角,这说明后者的减摩耐磨性能和对蒸馏水的不粘性优于前者.
The FeAl crystalline and Al-Cu-Cr quasicrystalline (QC) powders were deposited on AISI 1045 steel substrate by high-velocity oxy-fuel (HVOF) spraying, respectively. The morphology of flattening splats and surface wettability of as-sprayed coatings were characterized by metallographic microscope and contact angle tester. The phase composition of the QC powder and coating were examined by X-ray Diffraction. The microhardness tests were performed using MH-6 micro-hardness tester. The dry friction coefficient and wear loss of the coating were tested by MMW-1 friction wear testing machine. The XRD results showed that the original QC powder and its as-sprayed coating contained a predominated icosahedral QC phase I-Al_(65)Cu_(24)Cr_(11) and three minor crystalline phases, including θ-Al_(13)Cr_2 (i.e. Al_(83)Cu_4Cr_(13)), α-Al_(69)Cu_(18)Cr_(13) and ε-Al_2Cu_3. A qualitative analysis on the XRD patterns indicated that the volume fraction of any crystalline phase (α, θ or ε) in the coating was higher than that in the powder, while the content of the QC I-phase was lower than the latter. Under identical testing conditions, compared with conventional metallic crystalline coatings represented by FeAl, the HVOF Al-Cu-Cr QC coating had lower dry friction coeffficient and wear loss, and higher wetting angle to distilled water. And these results showed that the Al-Cu-Cr QC coating had better antifriction and wear-resisting properties than FeAl crystalline coating, and had an excellent non-sticking properties to distilled water.
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