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Structure and Tribological Behavior of Zr and Zr-N Surface Modified Layers on Ti and Ti6Al4V Alloys by Double Glow Plasma Surface Alloying Technique

Author: YeZuoRong
Tutor: LiXiuYan
School: Taiyuan University of Technology
Course: Condensed Matter Physics
Keywords: Titanium Ti6Al4V alloy Double glow plasma surface alloying technology Infiltration Zr Zr-N permeation Tribological properties
CLC: O469
Type: Master's thesis
Year: 2010
Downloads: 85
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Abstract

Titanium has a high strength, good thermal stability, excellent corrosion resistance and other characteristics , but because of the friction coefficient, wear resistance is poor , which greatly limits their range of applications. Surface treatment technology in use titanium surface modified layer is to improve the tribological properties of their important means . Double glow plasma surface alloying technology for surface modification of titanium alloys , which can effectively improve the tribological properties . In this paper, double glow plasma surface alloying technology, in the form of pure titanium and titanium alloy Ti6Al4V surface infiltration Zr and Zr-N permeation modified layer, wherein the substrate and Ti6Al4V titanium matrix modification layer forming temperature was 960 ℃ and 990 ℃, modified layer structure, hardness , friction and wear properties for a more systematic analysis and research findings are as follows : ( a ) the organization of the modified layer composition and phase structure : permeability Zr and Zr-N permeation after the surface of pure Ti and Ti6A14V dense uniformly formed modified layer , the modified layer element ingredients penetrate a gradient diffusion layer of the modified layer . Zr Ti6Al4V sample penetrates the matrix formed on the surface modification layer α-Ti, α-Zr, β-Zr alloys and TiZr ; Zr-N samples of the modified permeation layer is mainly made ??of titanium - nitrogen compounds Ti4N3, Ti2N and zirconium - N compound ZrN, Zr3N4 high hard phase. ( 2 ) the modified layer hardness : Soluble Zr and Zr-N permeation were reinforced pure Ti and Ti6A14V substrate surface , the hardness from the matrix to the surface from low to high gradient distribution , improving the matrix carrying capacity and modification layer between the substrate and the bonding strength . Of pure Ti and Zr Ti6Al4V for infiltration treatment, surface hardness increased slightly. Ar flow rate of nitrogen ratio of 1/ 1, of pure Ti for Zr-N permeation process , the maximum hardness of the specimen surface modified layer is 815HK0.01; Ti6Al4V for the permeation process Zr-N , respectively, N2 and Ar flow ratio 1/ 2, 1 /1 and 2 /1 , the maximum hardness of the specimen surface modified layer 813 HK0.01-1368 HK0.01 in range, and N2 flow rate greater , the greater surface hardness . ( 3 ) the modified layer dry friction behavior : for pure Ti and Zr Ti6Al4V for infiltration process , the specific wear rate slightly lower than the substrate . Of pure Ti for Zr-N permeation treated samples than the wear rate of the substrate is about 1/ 4 ; the Ti6A14V be treated Zr-N permeation wear rate of the sample after the substrate is about 1 /4 ~ 1 /2. Zr-N significantly increased permeation of pure Ti and Ti6A14V alloy wear resistance .

Structure and Tribological Behavior of Zr and Zr-N Surface Modified Layers on Ti and Ti6Al4V Alloys by Double Glow Plasma Surface Alloying Technique

Abstract

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