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| 团聚粉末制备工艺对冷喷涂Ti2AlC沉积的影响 |
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臧旭升1,2, 谢曦1,2, 沈艳芳1, 王吉强1, 柏春光1, 熊天英1
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1.中国科学院金属研究所, 沈阳 110016;2.中国科学技术大学 材料科学与工程学院, 沈阳 110016
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| 摘要: |
| 以热压烧结后球磨粉碎的Ti2AlC亚微米粉末为原料，通过水热处理使其团聚成微米级粉末，并运用冷喷涂技术在Zr-4合金基体上沉积Ti2AlC涂层。采用扫描电子显微镜、金相显微镜、XRD衍射仪、激光粒度分析仪等对Ti2AlC颗粒和涂层微观结构进行表征；采用显微硬度仪和拉伸测试系统对Ti2AlC涂层的基本力学性能进行测试；采用N2吸附法测涂层孔隙，采用电化学工作站测涂层的贯通孔隙。结果表明：对平均粒径<0.3 μm的Ti2AlC粉末进行水热处理时，添加硫酸铵能够促进亚微米颗粒的团聚，团聚粉末的平均粒度可达到6 μm。此粉末的冷喷涂特性最好，沉积的Ti2AlC涂层厚度达到100 μm，涂层中有微孔和介孔但没有贯通孔隙，涂层和基体结合强度达到了44 MPa。 |
| 关键词: Ti2AlC涂层 冷喷涂 水热处理 团聚 |
| DOI：10.11933/j.issn.1007-9289.20180131003 |
| 分类号:TG174.44 |
| 基金项目:国家自然科学基金（50971127） |
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| Influences of Agglomeration Powder Preparation on Deposition of Cold-sprayed Ti2AlC Coating |
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ZANG Xu-sheng1,2, XIE Xi1,2, SHEN Yan-fang1, WANG Ji-qiang1, BAI Chun-guang1, XIONG Tian-ying1
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1.Institute of Metal Research, Academy of Science, Shenyang 110016;2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016
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| Abstract: |
| The Ti2AlC submicron powders, fabricated by hot-pressing and ball milling, were hydrothermally treated. Then, Ti2AlC coating was successfully deposited on Zr-4 substrate by cold spray using the powders. The microstructure of Ti2AlC particles and as-sprayed coatings were characterized by scanning electron microscope (SEM), optical microscopy (OM), X-ray diffraction (XRD) and laser particle size analyzer. A micro hardness tester and a tensile-testing system were utilized to evaluate the mechanical properties of the Ti2AlC coatings. The porosity of the coatings was measured by N2 adsorption and the through-porosity of the coating was measured by an electrochemical workstation. The results show that the addition of (NH4)2SO4 can promote the agglomeration of nanoparticles during hydrothermal treatment. The particle size of the Ti2AlC powders increases from 0.3 μm to 6 μm after hydrothermal treatment with the addition of (NH4)2SO4. Using the powders as feedstock, a dense Ti2AlC coating of 100 μm thickness is deposited on Zr-4 substrate by cold spray. The bonding strength between the coating and substrate is measured to be 44 MPa. The coating is composed of micropores and mesopores, however, no through-porosity is noticed. |
| Key words: Ti2AlC coating cold spray hydrothermal treatment agglomeration |