| TC4钛合金表面B-Al复合渗层的组织和性能 |
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| 引用本文： | 高顺,田晓东,张梦瑶.TC4钛合金表面B-Al复合渗层的组织和性能[J].金属热处理,2020,45(3):11-14. |
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| 作者姓名： | 高顺 田晓东 张梦瑶 |
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| 作者单位： | 长安大学 材料科学与工程学院, 陕西 西安 710064 |
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| 摘 要： | 采用固体粉末包埋渗两步法,在TC4钛合金表面先1050 ℃渗硼 4~6 h再950~1050 ℃渗铝 4 h制备出B-Al复合耐磨渗层。利用X射线衍射仪(XRD)、扫描电镜(SEM)、波谱仪(WDS)和能谱仪(EDS)、显微硬度仪和摩擦磨损试验机对复合渗层的物相组成、显微组织、微区成分、表面硬度和摩擦因数进行测试和分析。结果表明:B-Al复合渗层厚为37~115 μm,主要由TiB2相和TiAl3相组成,外层是弥散分布TiB2的TiAl3层,向内依次形成厚度较小的TiAl2、TiAl及Ti3Al等Ti-Al金属间化合物层。B-Al复合渗层表面硬度为1041.7~1429.4 HV0.1,约为TC4钛合金硬度的3.03~4.16倍;经1050 ℃×6 h渗B后1050 ℃×4 h渗Al,其摩擦因数约为0.3,较TC4钛合金基体下降约25%。
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| 关 键 词： | TC4钛合金 B-Al复合渗层 摩擦因数 耐磨性能 |
| 收稿时间： | 2019-09-29 |
Microstructure and properties of B-Al composite coatings on TC4 titanium alloy |
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| Gao Shun,Tian Xiaodong,Zhang Mengyao.Microstructure and properties of B-Al composite coatings on TC4 titanium alloy[J].Heat Treatment of Metals,2020,45(3):11-14. |
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| Authors: | Gao Shun Tian Xiaodong Zhang Mengyao |
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| Affiliation: | School of Materials Science and Engineering, Chang'an University, Xi'an Shaanxi 710064, China |
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| Abstract: | B-Al composite coatings were prepared on the surface of TC4 titanium alloy by boronizing at 1050℃for 4-6 h and subsequent aluminizing at 950-1050℃for 4 h through a two-step pack cementation process.The constituent phases,microstructure,composition,hardness,friction coefficient of the composite coatings were analyzed by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),wavelength dispersive spectrometer(WDS)and energy dispersive spectrometer(EDS),microhardness tester,and friction and wear tester.The results show that the thickness of the B-Al composite coatings is in the range of 37-115μm,and the coatings mainly consist of TiB2 and TiAl3 phases.The outer layer is TiAl3 layer with dispersed TiB2;and TiAl2,Ti Al and Ti3Al intermetallic compound layers with smaller thickness are formed inward in turn.The surface hardness of the B-Al composite coatings is in the range of 1041.7-1429.4 HV0.1,which is about 3.03-4.16 times of the TC4 alloy.By boronizing at 1050℃for 6 h followed by aluminizing at 1050℃for 4 h,the friction coefficient of the B-Al composite coating is about 0.3,lower than that of TC4 alloy by about 25%. |
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| Keywords: | TC4 titanium alloy B-Al composite coatings friction coefficient wear resistance |
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