Effects of high temperature plasma immersion ion implantation on wear resistance of Ti-Si-B sintered alloys

SURFACE & COATINGS TECHNOLOGY

卷:228

Article

Fernandes, Bruno Bacci¹  Oliveira, Rogerio Moraes¹  Ueda, Mario¹  Magalhaes Mariano, Samantha de Fatima^1,2  Ramos, Alfeu Saraiva³  Vieira, Maxson Souza¹  Lourenco de Melo, Francisco Cristovao⁴  de Oliveira, Guilherme^1,2 

[1] INPE, LAP, Sao Jose Dos Campos, SP, Brazil

[2] ETEP Fac, BR-12600970 Sao Jose Dos Campos, SP, Brazil

[3] Univ Estadual Paulista, UNESP, FEG, BR-12516410 Guaratingueta, SP, Brazil

[4] IAE, DCTA, BR-12228904 Sao Jose Dos Campos, SP, Brazil

关键词: Titanium alloys;    Tribological properties;    Powder metallurgy;   

DOI  :  10.1016/j.surfcoat.2013.04.029

来源: Elsevier

【 摘 要 】

Although titanium and its alloys own good mechanical properties and excellent corrosion resistance, these materials present poor tribological properties for specific applications that require wear resistance. In order to produce wear-resistant surfaces, this work is aimed at achieving improvement of wear characteristics in Ti-Si-B alloys by means of high temperature nitrogen plasma immersion ion implantation (Pill). These alloys were produced by powder metallurgy using high energy ball milling and hot pressing. Scanning electron microscopy (SEM) and X-ray diffraction identified the presence of alpha-titanium, Ti6Si2B, Ti5Si3, TiB and Ti3Si phases. Wear tests were carried out with a ball-on-disk tribometer to evaluate the friction coefficient and wear rate in treated and untreated samples. The worn profiles were measured by visible light microscopy and examined by SEM in order to determine the wear rates and wear mechanisms. Ti-7.5Si-22.5B alloy presented the highest wear resistance amongst the untreated alloys produced in this work. High temperature PIII was effective to reduce the wear rate and friction coefficient of all the Ti-Si-B sintered alloys. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

Free