Abstract

A (TaC/Ta₂C) carbide bilayer is obtained by vacuum carburizing technology on the surface of Ta substrate at 1673 K for 4, 8, and 12 h. XRD, SEM and EBSD are utilized to investigated phase composition and the microstructure. The mechanical properties of the Ta and tantalum carburized materials are studied with Vicker’s hardness tester and nanoindenter, adhesion automatic scratch tester, reciprocating friction and wear testing machine. The results show that the outside surface phase composition of the carbide bilayer is all the TaC phase. With the increase of the carburizing time from 4 to 12 h, the average grain size from approximately 500 nm to 10 μm, the thickness of the carbide bilayer is from 11 to 20 μm. The microhardness increases from 104.1 to 322.5 HV, and the elastic modulus are from 466.6 to 615.3 GPa. Adhesive strength is best at 8 h, 49.1 N, compared to 19 N at 4 h and 36.5 N at 12 h. The friction and wear coefficient of Ta fluctuates significantly between 0.6 and 1.0, after carburizing treatment, the friction and wear coefficient fluctuates smoothly, and the wear resistance is well improved.

Graphic Abstract

中文翻译：

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真空渗碳时间对碳化钽层组织和力学性能的影响

摘要

A（TaC / Ta ₂C）通过真空渗碳技术在Ta衬底的表面以1673 K的温度进行4、8和12 h的碳化物双层。利用XRD，SEM和EBSD研究了相组成和微观结构。用维氏硬度计和纳米压头，附着力自动划痕测试仪，往复摩擦磨损测试机研究了钽和钽渗碳材料的机械性能。结果表明，碳化物双层的外表面相组成全部为TaC相。随着渗碳时间从4小时增加到12小时，平均晶粒尺寸从大约500nm增加到10μm，碳化物双层的厚度从11增加到20μm。显微硬度从104.1 HV增加到322.5 HV，弹性模量从466.6 GPa增加到615.3 GPa。在8 h，49.1 N，4小时为19 N，12小时为36.5N。Ta的摩擦磨损系数在0.6〜1.0之间波动较大，经过渗碳处理后，摩擦磨损系数平稳波动，耐磨性得到很好的提高。

图形摘要