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首页> 外文期刊>Materials Science and Engineering >Evaluation of modulus of elasticity, nano-hardness and fracture toughness of TiB2-TiC-Al_2O_3 composite coating developed by SHS and laser cladding
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Evaluation of modulus of elasticity, nano-hardness and fracture toughness of TiB2-TiC-Al_2O_3 composite coating developed by SHS and laser cladding

机译：SHS和激光熔覆技术开发的TiB2-TiC-Al_2O_3复合涂层的弹性模量，纳米硬度和断裂韧性的评价

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摘要

Modulus of elasticity (E) and nano-hardness (H) of the composite TiB_2-TiC-Al_2O_3 coating deposited on AISI 1020 steel by combined self-propagating high-temperature synthesis (SHS) and laser cladding process have been measured from load-displacement curves, resulting from nano-indentation testing. Fracture toughness (K_(IC)) of the coatings has been evaluated from the indentation method. A qualitative evaluation of interfacial strength between coating and substrate material was also performed by inden tation method. Results indicated elastic modulus and fracture toughness of the composite coatings are in the range of 230-280 GPa and 5.46-6.12 MPa m½ those are respectively lower and higher than those of the individual constituent ceramics. Nano-hardness of the coating microstructure obtained was in the range of 16-22 GPa and was found to vary depending on the laser-processing parameter adopted. Indentation taken with high load at the coating-substrate interface indicated a strong interfacial bond between coating and steel substrate. An attempt has been made to co-relate the wear rate of the coating with H/E ratio.
机译：通过负载位移法测量了结合自蔓延高温合成（SHS）和激光熔覆工艺沉积在AISI 1020钢上的TiB_2-TiC-Al_2O_3复合涂层的弹性模量（E）和纳米硬度（H）纳米压痕测试产生的曲线。涂层的断裂韧性（K_（IC））已通过压痕法进行了评估。涂层和基体材料之间的界面强度的定性评价也通过标记法进行。结果表明，复合涂层的弹性模量和断裂韧性在230-280 GPa和5.46-6.12 MPa m1 / 2的范围内，分别低于和高于单独组成的陶瓷。所获得的涂层微观结构的纳米硬度在16-22 GPa的范围内，并且根据所采用的激光加工参数而变化。在涂层-基底界面处以高载荷施加的压痕表明涂层与钢基底之间存在牢固的界面结合。已经尝试将涂层的磨损率与H / E比相关联。

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