Effects of La2O3 on Microstructure and Wear Properties of Laser Clad gamma/Cr7C3/TiC Composite Coatings on TiAl Intermatallic Alloy
文献类型：期刊论文
| 作者 | Liu XB(刘秀波) ; Yu RL(于荣莉)
|
| 刊名 | Materials Chemistry and Physics
 |
| 出版日期 | 2007 |
| 卷号 | 101期号:2-3页码:448-454 |
| 通讯作者邮箱 | liubobo828@yahoo.com.cn |
| ISSN号 | 0254-0584 |
| 通讯作者 | Liu, XB (reprint author), Chinese Acad Sci, Inst Mech, Lab Laser Intelligent Mfg, 15 Beisihuanxi Rd, Beijing 100080, Peoples R China. |
| 中文摘要 | The effects of La2O3 addition on the microstructure and wear properties of laser clad gamma/C(r)7C(3)/TiC composite coatings on gamma-TiAl intermetallic alloy substrates with NiCr-Cr3C2 precursor mixed powders have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive spectrometer (EDS) and block-on-ring wear tests. The responding wear mechanisms are discussed in detail. The results are compared with that for composite coating without La2O3. The comparison indicates that no evident new crystallographic phases are formed except a rapidly solidified microstructure consisting of the primary hard Cr7C3 and TiC carbides and the gamma/Cr7C3 eutectics distributed in the tough gamma nickel solid solution matrix. Good finishing coatings can be achieved under a proper amount of La2O3-addition and a suitable laser processing parameters. The additions of rare-earth oxide La,03 can refine and purify the microstructure of coatings, relatively decrease the volume fraction of primary blocky Cr7C3 to Cr7C3/gamma eutectics, reduce the dilution of clad material from base alloy and increase the microhardness of the coatings. When the addition of La2O3 is approximately 4 wt.%, the laser clad composite coating possesses the highest hardness and toughness. The composite coating with 4 wt.%La2O3 addition can result the best enhancement of wear resistance of about 30%. However, too less or excessive addition amount of La2O3 have no better influence on wear resistance of the composite coating. |
| 学科主题 | 力学 |
| 类目[WOS] | Materials Science, Multidisciplinary |
| 研究领域[WOS] | Materials Science |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000244394100035 |
| 公开日期 | 2007-06-15 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/16020]  |
| 专题 | 力学研究所_力学所知识产出(1956-2008) |
| 推荐引用方式 GB/T 7714 | Liu XB,Yu RL. Effects of La2O3 on Microstructure and Wear Properties of Laser Clad gamma/Cr7C3/TiC Composite Coatings on TiAl Intermatallic Alloy[J]. Materials Chemistry and Physics,2007,101(2-3):448-454. |
| APA | 刘秀波,&于荣莉.(2007).Effects of La2O3 on Microstructure and Wear Properties of Laser Clad gamma/Cr7C3/TiC Composite Coatings on TiAl Intermatallic Alloy.Materials Chemistry and Physics,101(2-3),448-454. |
| MLA | 刘秀波,et al."Effects of La2O3 on Microstructure and Wear Properties of Laser Clad gamma/Cr7C3/TiC Composite Coatings on TiAl Intermatallic Alloy".Materials Chemistry and Physics 101.2-3(2007):448-454. |
入库方式： OAI收割
来源：力学研究所
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