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 Posted: Wed 10:13, 05 Jan 2011 Post subject: jordan shoes Reaction casting TiC Fe composites t |
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Reaction casting TiC / Fe composites to high temperature thermodynamics of chemical reactions
ensionofphasearemoreperfectthanthatoflasercoatingunaddedrare-earthoxide. , Oreover, thewearre-sistanceandcorrosionresistanceoflasercoatingsarealsoenhanced. Keywords: lasercladding; rareearthCeO2; ceramiccompositecoating; wearresistance; corrosionresistance cladding layer of metal ceramic laser beam is used in ordinary metal cladding layer, high hardness, thermal stability, wear resistance, corrosion resistance, metallurgical bonding with the base takes the shape of metal-ceramic coating process L1]. It succeeded in metal ductility, high strength and high melting point ceramics, high hardness and good chemical stability combine to form a new composite coating has broad application prospects. However, due to the metal substrate and the ceramic phase difference between the thermophysical properties of the larger L2 thirty j, metallic ceramic coating by laser cladding coating facing prone to porosity and cracking problems. Many studies show that rare earth in the steel refining and purification of the organization with excellent performance [4; will be used for laser surface modification of rare earth, but also made some research results [5]. But the rare earth metal-ceramic coating for laser cladding, in particular, used for laser cladding TiC / Ni composite coatings few reports. [23 Yan promising TRANSACTIONS OF METERIALS Fu Zhengyi. Situ TiC particulate reinforced iron matrix composite formation mechanism and their organizations population], Materials Science, 1999,35 ((10): 1117. [3] JiangWH, DpanW, SongGH, eta1.In-situsynthesisofaTiC-FeCompositeinLiquidIron [J]. JournalofMaterialsScienceLet-ters, 1997,16:1830. [4] RaghunathC, BhatMS,[link widoczny dla zalogowanych], RrohapgiPk, eta1.1n-situtechniqueforsynthesizingFe-TiCComposites [J]. ScriptaMetallurgicaetMa-terialia,[link widoczny dla zalogowanych], 1995,32 (4): 577. [5] SHEN Ding-chiu. iron metallurgy [M]. Beijing: Metallurgical Industry Press, 1995. [6] Liang taught English, CHE Yin-chang. Inorganic Thermodynamic Data Handbook [MI. Shenyang: Northeastern University Press, 1993. [7] If the world horse. powder sintering theory [M]. Beijing: Metallurgical Industry Press, 1998. ● In this study, TiC. / Ni composite powder by adding rare earth oxides CeO, CeO of laser cladding of a TiC / Ni composite coating with abrasion resistance corrosion performance. 1 Test materials and methods for testing the base material for the A3 steel, processed into 35 × 15 × 8 (mm) of the sample; coated alloy powder used self-fluxing alloy powder Ni60, and its chemical composition (mass fraction) was: 0.9C, 15.8Cr, 11.2Fe, 3.9Si, 3.0B, more than for the Ni, 15O ~ 300 mesh particle size; ceramic particle phase is TiC, grain size of about 325 mesh; selection of rare earth oxide CeO, purity of 99.95. First, the mass fraction of powder at 2OTiC, CeO 0,[link widoczny dla zalogowanych],0.4,1.0 respectively, and the remaining proportion of the Ni-based powder mixture, and then through the pre-coated with organic binder deposited on the sample surface (thick 1ram). drying the sample before laser treatment, and heated to 250 ℃, with TJ-HL5kWCO cross-flow single-channel laser scanning. laser cladding,[link widoczny dla zalogowanych], the laser output power of 25kW, spot diameter of 5mm, scanning speed 3mm / s, the scanning process using nitrogen protection. the laser treated specimen cross-section made of metallurgical samples, with NU-2 metallographic microscope and a JXA 8800 electron probe to observe the microstructure and macro-morphology, with D / max-3 X-ray diffraction for phase analysis. with the M-200 block of ring wear test machine Received Date :2002-04-11 Author: Xu Bofan (1941 a) , M, Zhejiang Hangzhou, Professor.
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