TiC-TiB2 Coating on Ti-6Al-4V Alloy Substrate in Graded Composition Achieved by Fusion Bonding and Atomic Interdiffusion under Combustion Synthesis in High-Gravity Field

Xue Gang Huang; Zhong Min Zhao; Long Zhang; Li Qing Shi

doi:10.4028/www.scientific.net/KEM.537.46

Paper Titles

Crack Formation and Distribution of SiC Coating Prepared by CVD on Carbon/Carbon Composites
p.28

A C/SiC Graded Coating on C/C Composites by LPCVD in the Methyltrichlorosilane/Hydrogen System
p.32

Effect of Yb₂SiO₅ Ceramic Layer Thickness on the Thermal Cycling Life of Yb₂SiO₅⁄LaMgAl₁₁O₁₉ Coating Deposited on C⁄SiC Composites
p.36

High Temperature In Situ Antioxidation Coating Fabricated by AAC Method
p.42

TiC-TiB₂ Coating on Ti-6Al-4V Alloy Substrate in Graded Composition Achieved by Fusion Bonding and Atomic Interdiffusion under Combustion Synthesis in High-Gravity Field
p.46

Ceramic Coating of TiC-TiB₂ on 1Cr18Ni9Ti Substrate Achieved by Combustion Synthesis in High-Gravity Field
p.52

Investigation of Boron Nitride Prepared by Low Pressure Chemical Vapor Deposition at 650~1200 °C
p.58

Hardness and Wear Resistance of Ti-B-C-N Nanocomposite Coatings Synthesized by Multi-Target Magnetron Co-Sputtering
p.63

Preparation and Salt Spray Corrosion Resistance of Ni/BN and NiCrAl/BN Coatings
p.67

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TiC-TiB₂ Coating on Ti-6Al-4V Alloy Substrate in Graded Composition Achieved by Fusion Bonding and Atomic Interdiffusion under Combustion Synthesis in High-Gravity Field

Abstract:

Based on fusion bonding of liquid TiC-TiB₂ ceramic film and molten Ti-6Al-4V substrate to induce the surface alloying of Ti-6Al-4V substrate, the TiC-TiB₂ ceramic coating on Ti-6Al-4V substrate was achieved in graded composition by combustion synthesis in high-gravity field. XRD, FESEM and EDS results showed that TiC-TiB₂ ceramic coating was composed of fine TiB₂ platelets, TiC irregular grains, Cr metallic phase and a few Al₂O₃ inclusions. The mechanical properties showed that the relative density, microhardness and fracture toughness of TiC-TiB2 ceramic coating reached 98.5%, 25.8 ± 3.5 GPa and 16.5 ± 2.5 MPa • m^0.5, respectively. The fusion-bonding area and heat-affected zone of Ti alloy were obviously observed between the ceramic coating and Ti alloy substrate, and within the fusion bonding area a number of ultralfine TiB platelets and fine Ti-enriched carbides were embedded in the matrix of α’-Ti martensite, whereas at the heat-affected zone of Ti-6A1-4V substrate some C, B atoms were also detected. As a coupled result of fusion bonding and inter-diffusion between liquid ceramic film and molten Ti alloy substrate, followed by TiB₂-Ti peritectic reaction and subsequent eutectic reaction in TiC-TiB-Ti ternary system, the ceramic coating of TiC-TiB₂ on Ti-6Al4V substrate was achieved in continuously-graded composition, presenting the transitional change in microhardness from the ceramic coating to Ti alloy substrate with high shear strength of 450 ± 35 MPa between the coating and the substrate.