Mg_3Sb_2含量对Al-Mg_3Sb_2复相涂层耐磨性的影响
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摘要
目的研究Mg_3Sb_2含量对Al-Mg_3Sb_2复相涂层的组织、硬度和摩擦学性能的影响,对比分析AZ31B镁合金基体、纯Al涂层和添加不同含量的Mg_3Sb_2之后涂层性能的差异。方法通过火焰喷涂技术在AZ31B镁合金表面制备了Al-Mg_3Sb_2复相涂层。利用扫描电镜(SEM)观察了涂层的截面形貌,利用X射线衍射仪(XRD)分析了涂层的物相组成。通过显微硬度计测试了AZ31B和涂层的硬度,通过摩擦磨损试验仪测试了AZ31B和涂层的摩擦学性能,并通过超景深三维显微镜测试了试样的磨痕宽度、深度及磨损体积。结果经火焰喷涂后可得到组织致密的复相涂层,涂层中的物相主要为Mg_3Sb_2和Al。涂层的平均硬度随Mg_3Sb_2含量的增加而增加,最高可达334.2HV0.025,是AZ31B的4.14倍。摩擦磨损试验中,涂层的摩擦系数随着Mg_3Sb_2含量的增加而减小,但都大于AZ31B的摩擦系数;涂层的磨损率随着Mg_3Sb_2含量的增加而减小,60%Mg_3Sb_2和80%Mg_3Sb_2涂层的磨损率小于AZ31B的磨损率,其他涂层的磨损率大于AZ31B的磨损率,80%Mg_3Sb_2涂层的耐磨性最好,比AZ31B下降了63.26%。随着Mg_3Sb_2含量的增加,Al-Mg_3Sb_2复相涂层的磨痕表面犁沟逐渐变浅并消失。结论 Mg_3Sb_2的加入可以提高涂层的硬度,随着其含量的增加,涂层的耐磨性逐渐提高。
The work aims to study effects of Mg_3Sb_2 on microstructure, hardness and tribological properties of Al-Mg_3Sb_2 composite coatings and compare differences in properties of AZ31 B magnesium alloy substrate, pure Al coating and coatings doped with different content of Mg_3Sb_2. The Al-Mg_3Sb_2 composite coatings were prepared on the surface of magnesium alloy AZ31 B by flame spraying. Cross sectional morphology of the coatings were observed with SEM. Phase composition of the coatings was analyzed with XRD. Microhardness of AZ31 B and the coatings was tested with microhardness tester. Tribological properties of AZ31 B and the coatings were measured with friction-wear tester. And width, depth and wear volume of grinding cracks were measured with ultra deep field 3 D microscope. Dense composite coatings could be obtained by flame spraying, and phases in the coatings were mainly Mg_3Sb_2 and Al. Average microhardnesses of the coatings increased with the increase of Mg_3Sb_2 content, which was up to 334.2 HV0.025, which was 4.14 times that of AZ31 B. In the friction-wear test, friction coefficient of the coatings decreased with the increase of Mg_3Sb_2 content, which was greater than that of AZ31 B. Wear rate of the coatings decreased with the increase of Mg_3Sb_2 content. Wear rates of 60% Mg_3Sb_2 and 80% Mg_3Sb_2 coatings were less than that of AZ31 B, wear rates of other coatings were more than that of AZ31 B. Compared with AZ31 B, wear rate of the 80%Mg_3Sb_2 coating decreased by 63.26%. With the increase of Mg_3Sb_2 content, worn surface furrows on the Al-Mg_3Sb_2 composite coating become shallow and disappeared gradually. The addition of Mg_3Sb_2 can improve hardness of the coatings, and wear resistance of the coatings increases gradually with the increase of Mg_3Sb_2 content.
The work aims to study effects of Mg_3Sb_2 on microstructure, hardness and tribological properties of Al-Mg_3Sb_2 composite coatings and compare differences in properties of AZ31 B magnesium alloy substrate, pure Al coating and coatings doped with different content of Mg_3Sb_2. The Al-Mg_3Sb_2 composite coatings were prepared on the surface of magnesium alloy AZ31 B by flame spraying. Cross sectional morphology of the coatings were observed with SEM. Phase composition of the coatings was analyzed with XRD. Microhardness of AZ31 B and the coatings was tested with microhardness tester. Tribological properties of AZ31 B and the coatings were measured with friction-wear tester. And width, depth and wear volume of grinding cracks were measured with ultra deep field 3 D microscope. Dense composite coatings could be obtained by flame spraying, and phases in the coatings were mainly Mg_3Sb_2 and Al. Average microhardnesses of the coatings increased with the increase of Mg_3Sb_2 content, which was up to 334.2 HV0.025, which was 4.14 times that of AZ31 B. In the friction-wear test, friction coefficient of the coatings decreased with the increase of Mg_3Sb_2 content, which was greater than that of AZ31 B. Wear rate of the coatings decreased with the increase of Mg_3Sb_2 content. Wear rates of 60% Mg_3Sb_2 and 80% Mg_3Sb_2 coatings were less than that of AZ31 B, wear rates of other coatings were more than that of AZ31 B. Compared with AZ31 B, wear rate of the 80%Mg_3Sb_2 coating decreased by 63.26%. With the increase of Mg_3Sb_2 content, worn surface furrows on the Al-Mg_3Sb_2 composite coating become shallow and disappeared gradually. The addition of Mg_3Sb_2 can improve hardness of the coatings, and wear resistance of the coatings increases gradually with the increase of Mg_3Sb_2 content.
引文
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[3]?LHAN?.Structure and Surface Properties of Al2O3-Ti O2 Ceramic Coated AZ31 Magnesium Alloy[J].Ceramics International,2016,42(12):13659-13663.
[4]陈杰,马冰,刘光,等.镁合金表面冷喷涂纳米WC-17Co涂层及其性能[J].中国表面工程,2017,30(3):74-80.CHEN Jie,MA Bing,LIU Guang,et al.Preparation and Properties of Cold Sprayed Nano WC-17Co Coating on Magnesium Alloy[J].China Surface Engineering,2017,30(3):74-80.
[5]孟君晟,齐兴权,周志文,等.镁合金表面氩弧熔覆Al-Si基Si C复合涂层组织及耐磨性[J].黑龙江科技大学学报,2015,25(2):196-200.MENG Jun-sheng,QI Xing-quan,ZHOU Zhi-wen,et al.Microstructure and Wear Resistance of Magnesium Alloy by Argon Arc Cladding with Al-Si-based Si C Composite Coating[J].Journal of Heilongjiang University of Science&Technology,2015,25(2):196-200.
[6]ZHENG B J,CHEN X M,LIAN J S.Microstructure and Wear Property of Laser Cladding Al+Si C Powders on AZ91D Magnesium Alloy[J].Optics and Lasers in Engineering,2010,48:526-532.
[7]王丹,龙威,周小平.AZ31B镁合金Al-Al B12-Al2O3涂层的耐蚀和耐磨性能[J].材料热处理学报,2017,38(3):149-153.WANG Dan,LONG Wei,ZHOU Xiao-ping.Corrosion and Wear Resistance of Al-Al B12-Al2O3 Coating on AZ31B Magnesium Alloy[J].Transactions of Materials and Heat Treatment,2017,38(3):149-153.
[8]CARCELA B,SAMPERDROA J,RUESCASB A,et al.Corrosion and Wear Resistance Iimprovement of Magnesium Alloys by Laser Cladding with Al-Si[J].Physics Procedia,2011,12:353-363.
[9]吴建鹏,朱振峰,曹玉泉.金属间化合物的研究现状与发展[J].热加工工艺,2004(5):41-43.WU Jian-peng,ZHU Zhen-feng,CAO Yu-quan.Research Status and Development on Intermetallics Compounds[J].Hot Working Technology,2004(5):41-43.
[10]余伟阳,唐壁玉,彭立明,等.α-Mg3Sb2的电子结构力学性能[J].物理学报,2009(S1):216-223.YU Wei-yang,TANG Bi-yu,PENG Li-ming,et al.Electronic Structure and Mechanical Properties ofα-Mg3Sb2[J].Acta Physica Sinica,2009(S1):216-223.
[11]韩婷婷,龙威,周小平.Mg3Sb2金属间化合物的机械化学合成工艺[J].材料热处理学报,2017,38(3):41-48.HAN Ting-ting,LONG Wei,ZHOU Xiao-ping.Mechanical and Chemical Synthesis Process of Mg3Sb2Intermetallic Compound[J].Transactions of Materials and Heat Treatment,2017,38(3):41-48.
[12]李方正,王昆仑,赵继凤,等.Cr基及其化合物过渡层对Ti CN涂层性能的影响[J].中国表面工程,2017,30(2):56-62.LI Fang-zheng,WANG Kun-lun,ZHAO Ji-feng,et al.Effect of Interlayers Based on Cr and Its Compound on Properties of Ti CN Coatings[J].China Surface Engineering,2017,30(2):56-62.