TaC增强铁基梯度复合材料的原位生成及其磨粒磨损特性*

doi:10.11901/1005.3093.2013.897

材料研究学报

2014, Vol. 28

Issue (8): 567-572 DOI: 10.11901/1005.3093.2013.897

本期目录 | 过刊浏览

TaC增强铁基梯度复合材料的原位生成及其磨粒磨损特性*

赵娜娜¹,许云华¹(

),钟黎声²,黄星¹,孟文可¹,叶芳霞¹

1. 西安理工大学材料科学与工程学院西安 710048
2. 西北工业大学凝固技术国家重点实验室西安 710072

Abrasive Wear Characteristics of Surface Gradient Composites of TaC Reinforced Iron Matrix Prepared by In-Situ Technology

Nana ZHAO¹,Yunhua XU^1,^**(

),Lisheng ZHONG²,Xing HUANG¹,Wenke MENG¹,Fangxia YE¹

1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

引用本文:

赵娜娜,许云华,钟黎声,黄星,孟文可,叶芳霞. TaC增强铁基梯度复合材料的原位生成及其磨粒磨损特性*[J]. 材料研究学报, 2014, 28(8): 567-572.
Nana ZHAO, Yunhua XU, Lisheng ZHONG, Xing HUANG, Wenke MENG, Fangxia YE. Abrasive Wear Characteristics of Surface Gradient Composites of TaC Reinforced Iron Matrix Prepared by In-Situ Technology[J]. Chinese Journal of Materials Research, 2014, 28(8): 567-572.

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摘要:

以高纯钽板为原料, 采用原位反应法在HT300表面制备了碳化钽增强表面梯度复合材料。用扫描电子显微镜、X射线衍射仪、显微硬度计和磨粒磨损试验机对复合层的微观形貌、物相组成、显微硬度以及磨粒磨损性能进行了表征。结果表明: 所得复合层的总厚度约为475 μm。最表层为碳化钽致密陶瓷层, 厚度约为170 μm, 其颗粒尺寸小于1 μm, 体积分数近似95%, 显微硬度最高值达2328HV_0.1; 次表层为碳化钽颗粒分散层, 其颗粒尺寸为0.5～1.5 μm, 体积分数从90%逐渐减小至基体, 显微硬度由915HV_0.1降低至410HV_0.1; 复合层与基体之间呈现良好的冶金结合。铁基表面碳化钽陶瓷增强梯度复合材料的耐磨性比灰口铸铁基体有大幅度提高; 复合层的磨损是局部塑性变形、显微切削和增强颗粒的部分破碎等因素综合作用的结果。

关键词 ：复合材料, 原位反应, 致密陶瓷, 磨粒磨损

Abstract：

Tantalum carbide gradient composite was fabricated via in-situ reaction of pure tantalum plate with gray cast at high temperature. The morphology, phase constituent, microhardness, and relative abrasion resistance of the composite were characterized by scanning electron microscopy, X-ray diffraction, microhardness tester and abrasive wear testing machine. The results show that the thickness of the gradient composite is about 475 μm. The cast 170 μm thick surface layer is a dense ceramic layer consisted of ~95% submicron TaC particles, and the highest micro-hardness value of which is 2328HV_0.1; In the sub-layer, there exists a gradient distribution of TaC particles from 90% to 0% in volume fraction, correspondingly the microhardness value decreased from 915HV_0.1to 410HV_0.1, and the size of the TaC particles increased to 0.5-1.5 μm; the interface between the composite and matrix exhibits a perfect metallurgical bonding. The TaC reinforced iron matrix surface gradient composite shows far superior wear resistance than the gray cast iron. The wear mechanism is mainly related with the local plastic deformation, micro cracking caused by misrouted broken carbide particles.

Key words： composite in-situ reaction dense ceramic abrasive wear

收稿日期: 2013-11-26

基金资助:* 国家高技术研究发展计划项目2013AA031803和国家自然科学基金项目51374169资助。

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表1 实验原材料HT300和钽板的化学成分

图1 Fe-Ta-C体系的差热分析曲线

图2 TaC增强铁基表面梯度复合材料的XRD图谱

图3 TaC增强铁基表面梯度复合材料组织宏观形貌图

图4 TaC增强铁基表面梯度复合材料不同区域的组织形貌

图5 不同复合层显微硬度的变化

图6 TaC增强铁基表面梯度复合材料不同反应层的相对耐磨性

图7 载荷为5 N时的磨损形貌图

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