等离子弧熔覆(Cr, Fe)7C3/γ-Fe复合耐磨涂层研究

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"PTA clad (Cr, Fe)7C3/γ-Fe in-situ ceramal composite coating (2006年)" 是一篇在《北京科技大学学报》第13卷第6期（2006年12月）发表的工程技术论文。该研究由刘俊波、王立梅和黄继华共同完成，主要探讨了一种通过等离子弧熔覆工艺在0.45wt%碳钢基体上制备的耐磨(Cr, Fe)7C3/γ-Fe原位陶瓷复合涂层。文章指出，使用Fe-Cr-C元素粉末混合物，通过等离子转移弧熔覆技术在碳钢基材上形成了这种复合涂层。涂层的微观结构、硬度和干滑动磨损性能得到了评估。实验结果显示，涂层的微观结构由(Cr, Fe)7C3为主要相均匀分布在γ-Fe基体以及(Cr, Fe)7C3共晶矩阵中，这些成分与0.45wt%碳钢基体形成了冶金结合。论文中提到的(Cr, Fe)7C3/γ-Fe复合涂层具有优异的耐磨性，这主要得益于(Cr, Fe)7C3硬质相的均匀分布，它增强了材料的抵抗机械磨损的能力。γ-Fe基体则提供了良好的韧性，使得涂层在承受载荷时不易断裂。此外，冶金结合确保了涂层与基体的牢固连接，提高了整体的结构稳定性。等离子转移弧熔覆是一种先进的表面处理技术，它可以实现高温下金属与非金属粉末的快速熔化和凝固，形成与基体紧密结合的复合涂层。这项技术对于改善材料表面性能，如提高耐磨损、耐腐蚀和抗氧化能力等方面具有重要意义。总结来说，这篇论文详细介绍了利用等离子弧熔覆技术制备的(Cr, Fe)7C3/γ-Fe原位陶瓷复合涂层的制备方法、微观结构特征以及其优异的耐磨性能。这对于提升工业设备和零部件的使用寿命，特别是在高磨损环境下工作的部件，提供了重要的理论支持和技术参考。

Journal of University of Science and Technology Beijing

Volume 13, Number 6, December 2006, Page 1

Corresponding author: Junbo Liu, E-mail: junboliu0525@163.com

Materials

PTA clad (Cr, Fe)

/γ-Fe in-situ ceramal composite coating

Junbo Liu

, Limei Wang

, and Jihua Huang

1) Department of Mechanical and Electronic Engineering, WeiFang University, Shandong WeiFang 261041, China

2) Laboratory and Equipment Administration,WeiFang University, Shandong WeiFang 261061, China

3) School of Materials Science and Engineering, University of Science and technology, Beijing 100083, China

(Received 2006-02-07)

Abstract: A wear-resistant (Cr, Fe)

/-Fe in-situ ceramal composite coating was fabricated on the substrate of 0.45wt%C carbon

steel by a plasma transferred arc cladding process using the Fe-Cr-C elemental powder blends. The microstructure, microhardness

and dry-sliding wear resistance of the coating were evaluated. The results indicate that the microstructure of the coating consisting of

(Cr, Fe)

primary phase uniformly distributed in the -Fe and the (Cr, Fe)

eutectic matrix was metallurgically bonded to the

0.45wt%C carbon steel substrate. The microstructure of the coating had the visible epitaxial growth character from substrate to coat-

ing. The coating, indehiscent and tack-free, had high hardness and appropriate gradient. It had excellent wear resistance under the dry

sliding wear test condition.

Key words: plasma transferred arc cladding; (Cr, Fe)

/-Fe; coating; microstructure; wear-resistance

1. Introduction

Fabricating a high-performance wear resistant

coating on the surface of tribological components with

appropriate surface engineering technology is one of

the most efficient approaches to enhance the tribolog-

ical performance for many moving mechanical com-

ponents from both economic and technological points

of view. Among the widely used surface engineering

technologies, laser cladding, plasma transferred arc

(PTA) cladding, flame spray and plasma spray can

produce a relatively thicker coating [1-6]. PTA pos-

sesses high temperatures and the PTA cladding

process is easy to operate and not related to surface

reflectivity of the base material. These features impart

the PTA an expectation as the unique heat source of a

new surface modification technology. PTA cladding

process represents a very good alternative to

above-mentioned technologies and much work on this

has been conducted [7-10].

The (Cr, Fe)

is well known for its excellent

combination of high hardness, excellent wear resis-

tance as well as good corrosion and oxidation resis-

tance, so it has been widely used as the reinforcing

phase in the ceramal composite coatings. The ceramal

composite coating with hard and wear resistant

(Cr,Fe)

as the reinforcing phase and the ductile

-Fe as the matrix would be expected to have out-

standing wear resistance and toughness. In this paper,

PTA cladding technology was adopted to produce

(Cr,Fe)

/-Fe in-situ ceramal composite coating on

the 0.45wt%C carbon steel substrate. The microstruc-

ture of the coating was characterized by optical mi-

croscopy (OM), scanning electron microscope (SEM),

energy dispersive X-ray analysis (EDS), and X-ray

diffraction (XRD). The wear resistance of the coating

was evaluated under dry sliding test conditions at

room temperature.

2. Experimental

PTA cladding process was carried out on the DRF-1

PTA cladding system. The optimized PTA cladding

parameters are:

 plasma gas flux: Ar 3 L/min;

 feeding gas flux: Ar 2.5 L/min;

 powder feeding rate: 30 g/min;

 working electric current: 120 A;

 working voltage: 30 V;

 scanning speed: 350 mm/min.

The Fe-Cr-C alloy, with an average particle size

ranging from 70-140 m was selected as the precursor

material for fabricating the (Cr, Fe)

/-Fe ceramal

composite coating by the PTA cladding process. A

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