超音速火焰喷涂Al-Cu-Cr准晶涂层表面不粘性和耐磨性的研究  

Surface Non-Sticking and Wear-Resisting Properties of High-Velocity Oxy-Fuel Sprayed Al-Cu-Cr Quasicrystalline Coatings

作　　者：傅迎庆[1] 周锋[1] 高阳[1] 杨德明[1] 李南翔[1] 

机构地区：[1]大连海事大学,辽宁大连116026

出　　处：《稀有金属材料与工程》2009年第A02期635-639,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50805012;50575028);大连海事大学青年教师科研基金项目(DLMU-ZL-200721)资助

摘　　要：以普通45#钢为基体,分别以FeAl晶体粉末和Al65Cu20Cr15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-Al65Cu24Cr11,和另外3种含量极少的晶体相,即θ-Al13Cr2(即Al83Cu4Cr13)、α-Al69Cu18Cr13和ε-Al2Cu3;但是与原始准晶粉末相比,HVOF涂层中准晶相I-Al65Cu24Cr11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-Al65Cu24Cr11 and three minor crystalline phases, including θ-Al13Cr2 （i.e. Al83Cu4Cr13）, α-Al69Cu18Cr13 and ε-AlECU3. 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 FeAI, 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.

关 键 词：准晶 超音速火焰喷涂 摩擦 磨损 润湿 

分 类 号：TG174.442[金属学及工艺—金属表面处理]