Modifying Cr/CrN composite structure by Fe addition: Toward manufacturing cost-effective and tough hard coatings

被引：13

作者：

He, Jiayi ^{[1
]}

Lan, Xuexia ^{[1
]}

Wan, Jian ^{[1
]}

Liu, Huanlong ^{[1
]}

Liu, Zhongwu ^{[1
]}

Jiao, Dongling ^{[1
]}

Zhong, Xichun ^{[1
]}

Cheng, Yitian ^{[2
]}

Qiu, Wanqi ^{[1
]}

机构：

[1] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China

[2] Shenzhen Polytech, Inst Intelligent Mfg Technol, Postdoctoral Innovat Practice Base, Shenzhen 518055, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2021年 / 545卷

基金：

中国国家自然科学基金;

关键词：

Low cost; Cr-Fe-N; Composite coating; PVD; Toughness;

D O I：

10.1016/j.apsusc.2021.149025

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-performance cutting tools require hard yet tough coatings. Physical vapor deposited CrN ceramic coatings exhibit great hardness but also high brittleness. Introducing metal phase to form Cr/CrN composite structure is effective to enhance their toughness. However, high cost hot-pressed Cr targets and narrow processing window of coating deposition limit the application of Cr/CrN composite coatings. In this work, up to 20 at.% Fe was selected to alloy with Cr in the target, aiming at simultaneously facilitating the HP process and modifying the Cr/CrN composite structure. With the help of Fe, dense targets with relative densities beyond 98% can be fabricated at the low sintering temperature of 1100 degrees C, 100 degrees C lower than that for pure Cr target. With the Cr-Fe targets, Cr (Fe)/(Cr,Fe)N composite coatings were deposited by magnetron sputtering under a N-2/Ar mixed atmosphere. The hardness of coating increases from 7.26 to 11.27 GPa when Fe content in target increases from 0 to 5 at.%, due to the solution strengthening. The toughness of coating is also enhanced because of the increased amount of Cr(Fe) phase. Cr(Fe) and (Cr,Fe)N in the coating display a "pearlite-like" distribution, and in this structure, the Cr (Fe) phase is helpful to crack bridging and strain relaxation.

引用

页数：8