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Preparation and property of seal coating for gas turbine compressor

China Welding 2024年第1期33卷 60-64页

作者：余沛坰刘中华郑健生徐伏根陈千宝 Zhejiang Rancon Turbine Machinery Co. Ltd.Hangzhou 310020China Hangzhou Steam Turbine Power Group Co. Ltd.Hangzhou 310020China

Double-layer structure of seal coating which consisted of a Ni5Al bond coating and a Ni25 graphite top coating were prepared on steel substrate of gas turbine compressor cylinder *** coating was prepared by atmospheric plasma spraying and top coating was prepared by flame *** microstructure,mechanical properties and abradability of the coating were characterized by scanning elec-tron microscope(SEM),hardness tester,universal testing machine,thermal shock testing machine and abradability testing *** res-ults show that the overall spraying structure of the seal coating is uniform,the nickel metal phase is the skeleton supporting the entire coat-ing,and the coating is well bonded without *** seal coating has a bonding strength of not less than 7.7 MPa,excellent thermal stability,and thermal shock resistance cycle numbers at 500℃more than 50;the scratch length,deepest invasion depth and wear amount of the coating increase with rise of test temperature,with almost no coating adhesion,indicating that the seal coating has excellent abradability.

关键词： gas turbine compressor seal coating microstructure mechanical property abradability

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Effect of Coated PHB on Properties of Abradable seal coating

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Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 417-421页

作者：程旭东 XIANG Hongyu YE Weiping MENG Xiaoming MIN Jie LIU Minzhi ZHANG Pu LU Wei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Materials Science and Engineering Wuhan University of Technology

As pore-forming materials, the coated polyop-hydroxybenzoate（short for PHB） and h-BN can be applied in the preparation of abradable seal coatings at high temperature. The characteristics of coating such as morphology, thermal stability and composition were studied by SEM, EDS and FTIR. The results show that the modified PHB will change the remained carbon amount, porosity and pore morphology of the coating, which can affect the properties of coatings. If the pore is small enough in uniform distribution, the coating with 5 MPa bond strength, 30-55 HR45Y superficial hardness and certain of carbon can be suitable to well abradability.

关键词： coated-PHB pore morphology seal coating

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Corrosion behaviour of NiCrFeAl-hBN seal coatings in oxidation environments at a high temperature

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Rare Metals 2021年第1期40卷 212-218页

作者： Su-Yuan Yang Dan Guo Xing-Wang Cheng Jian-Ming Liu Yue-Guang Yu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081.China National Key Laboratory of Science and Technol Beijing General Research

The purpose of this investigation was to evaluate the microstructure,high-temperature oxidation behaviour,and hardness of a seal coating under controlled exposures at 750℃with different exposure *** results reveal that the main phases in the coating are Ni,FeNi3,and hexagonal BN,withα-Al_(2)O_(3)peaks appearing after 2-h *** the exposure time increases,the diffraction peak intensity ofα-Al_(2)O_(3)begins to decrease and Cr_(2)O_(3)peaks appear after 200 *** 1000 h,Cr_(2)O_(3)becomes dominant with only small amounts ofα-Al_(2)O_(3)*** high-temperature oxidation process of the coating includes three stages:the fast stage,transition stage,and slow *** oxidation rate is constant in each stage,and in the fast stage and slow stages with values of7.9×10^(-4)and 8.37×10^(-5)mg^(2)·cm^(-4)·s^(-1),***,α-Al_(2)O_(3)forms near the pores in the coating,followed by the formation of Cr_(2)O_(3).As the exposure time increases,oxidation penetrates into the interior of the coating along phase boundaries to form island-shaped inner oxide layers with high concentrations of Cr,Ni,and ***,hardness increases with increasing oxide percentage.

关键词： NiCrFeAl-hBN seal coating Oxidation Microstructure High temperature

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Tribological behaviors of turbofan seal couples from friction heat perspective under high-speed rubbing condition

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Friction 2016年第2期4卷 176-190页

作者： Siyang GAO Weihai XUE Deli DUAN Shu LI Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The tribological behaviors of two types of seal coatings, nickel–graphite and aluminum–hexagon-boron nitride (Ni–Cg and Al–hBN, respectively) versus a Ti–6Al–4V blade used in turbofan engines were investigated using a high-speed rubbing test. The wear status and damage mechanism of the friction couples were studied and the abradability of the seal coatings was evaluated. By analysis of the coating properties and damage mechanism of the seal couple, the friction heat effect was identified as the key factor influencing blade wear forms as well as coating abradability. A one-dimensional heat conduction model was established to estimate the effect of increasing temperature on the friction interface. The results indicated that in the Ni–Cg and Ti–6Al–4V seal couple, the temperature rising rate (TRR) of the Ti–6Al–4V blade was faster than that of the Ni–Cg coating, and so the Ti–6Al–4V blade softened earlier than the Ni–Cg coating, causing the blade to suffer severe wear. In the Al–hBN and Ti–6Al–4V seal couple, the TRR of the Ti–6Al–4V blade was slower than that of the Al–hBN coating, and so the Al–hBN coating softened first; thus, blade damage was reduced or even replaced by coating adhesion. The square root ratio of thermal diffusivity between the blade and the coating could be taken as an indicator of the ratio of TRR between the blade and coating to predict blade wear status as well as damage mechanism. The results of the model agreed well with the experiment results of the two seal couples used in this study.

关键词： seal coating high-speed rubbing wear mechanism friction heat thermophysical property

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