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The Investigation on the Microstructure and Wear Mechanism of In-situ Synthesis TiC-TiB2 Particulates Reinforce Metal-matrix Composite Coatings by Gas Tungsten Arc Cladding

Author: ZhouXiaoHui
Tutor: ZhaoGuoGang；WangZhenTing
School: Heilongjiang Institute of Science and Technology
Course: Materials Science
Keywords: Argon Arc Cladding In situ synthesis TiC-TiB2 Wear resistance
CLC: TG174.44
Type: Master's thesis
Year: 2009
Downloads: 145
Quote: 2
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Abstract


In this paper, argon arc cladding technique , Ti powder , B 4 C powder and Fe powder as raw material prepared on Q235 Steel situ TiC -TiB 2 / Fe based composite coatings . Preferred the best ratio ( wt. %, 40 ? , Ti / B 4 C = 3/2 ) and the optimal parameters . Using scanning electron microscopy ( SEM ) , transmission electron microscopy ( TEM ) , X-ray diffractometer (XRD), micro hardness tester and sliding wear test machine on the microstructure, hardness and wear resistance of the composite coating and testing cladding layer in dry sliding wear conditions , the friction and wear properties . The test results show that Cladding TiC, TiB 2 and α-Fe coating and the substrate takes the shape of metallurgical bonding interface is clean and free of cracks, holes and other defects , cladding coating is divided into three area: cladding zone dilution zone and heat affected zone . TiC and TiB 2 formation mechanism based on solid - state diffusion mechanism - based , TiC the octahedral and petals dendritic first precipitation after precipitation of TiB 2 more than six gon and rod-like existence of TiB 2 < / sub> content greater than TiC content of TiB 2 organization is relatively bulky , TiC particle is relatively small . Dry sliding wear tests show that the GCr15 the friction coefficient with load increases and increases the coefficient of friction of the coating increases with load becomes smaller . GCr15 wear mechanism is adhesive wear and micro-cutting wear , coating wear mechanism is adhesive wear and abrasive wear, argon arc cladding coating showed excellent wear resistance under dry sliding wear conditions .

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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 > Metal complex layer of protection
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