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Laser and thermal spray surface modification coating

Author: ZhaoQun
Tutor: YuYongZuo
School: Dalian University of Technology
Course: Materials Science
Keywords: Laser nitriding Titanium TiN Plasma spraying Al2O3-TiO2 Ceramic coating
CLC: TG174.4
Type: Master's thesis
Year: 2003
Downloads: 475
Quote: 5
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Abstract


Use of performance in order to improve the hardness of the material , abrasion resistance , etc. , can be used a method of the surface coating . , TiN coating is usually used to improve the abrasion resistance and corrosion resistance of the surface of the material in the surface coating technology . Several surface modification technology TiN coating can be prepared . Nitriding method in the surface of the titanium substrate with a laser can be obtained a high hardness, high wear resistance of TiN coating . This article respectively laser nitride , both plasma spraying process to obtain high hardness , high wear resistance surface coating of the metal material surface . Titanium in a nitrogen gas formed by laser nitrided surface of the TiN phase as major enhancement coating . Observed using OM and SEM analysis of the microstructure of the nitride layer ; phase identification by X-ray diffraction analysis made ??objects ; analyzed by EPMA on the nitride layer N , the distribution of Ti ; by TEM analysis of the presence of the TiN phase , and made ??the microhardness tests as well as the friction and wear tests . The results show that the nitride layer for the α-Ti and TiN two - phase composition , the TEM analysis results also confirmed that the microstructure of the melt region hardness of 500HV-900HV within , the average coefficient of friction of the surface of the nitride layer is 0.13 . In the 45 Steel surface such as plasma spraying Al 2 O 3 < / sub > -45 % TiO 2 ceramic coating , spraying between the ceramic coating and the substrate NiCrAl metallic bonding layer. Means of SEM, XRD, EPMA and EDS analysis study the Al 2 O 3 < / sub > 2 < / sub > ceramics such as plasma sprayed layer of tissue -45% TiO structure , phase composition , Al 2 O 3 and the TiO 2 < / sub> distribution , and test the microhardness of the ceramic layer and the surface of the ceramic layer coefficient of friction. The results show that , the coatings lamellar Al 2 < / sub > O 3 < / sub > -45 % TiO . 2 < / sub > ceramic coating by γAl 2 < / sub> O 3 < / sub > TiO 2 < / sub > and a small amount of α-Al 2 O 3 composition ; due to the spray temperature high , localized melting of the Al 2 O 3 and the majority of the molten TiO 2 occurs each melt to a certain extent , the formation of Al 2 O 3 TiO 2 eutectic organizations . Good mechanical bonding interface is formed between the coating and the adhesive primer used to buffer the stress of the coating flaking .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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