Preparation and Tribological Property of Plasma Sprayed Adaptive Ni-Mo-Al-Ag-BN Composite Coating

2017 ◽  
Vol 739 ◽  
pp. 30-35
Author(s):  
Jian Liang Li ◽  
Hang Li ◽  
Dang Sheng Xiong ◽  
Yu Juan Ji ◽  
Yong Kun Qin
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
Tribological Property ◽  
Lubrication Mechanism ◽  
Wear Rates ◽  
Mechanism Model ◽  
Wide Range ◽  
Plasma Sprayed ◽  
Scanning Electron ◽  
Lubrication Mechanisms

In this paper an adaptive Ni-Mo-Al-Ag-BN composite coating was deposited by plasmaspraying. Its tribological property from 20°C-600°C were evaluated by using high temperature tribometer. Scanning electron microscopy and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The result shows that the friction coefficient of the Ni-Mo-Al–Ag-BN composite coating from 200°C to 400°C is about 0.4 and declines very slightly at 600°C . The wear rates of the coating is 2.0×10-4mm3/N*m at 600°C and the downward trend is obvious compared with 400°C. Silver provide lubrication below 400 °C. Ag2MoO4 were formed with the temperature raised, and acted as high-temperature lubricants above 400 °C. Ni-Mo-Al–Ag-BN composite coating established a new lubrication mechanism model at 600°C . It can be concluded that the plasma sprayed Ni-Mo-Al - Ag - BN composite coating can keep good tribological property at wide range of temperature.

A Study of Fe-Based Composite Coating Fabricated by the Self-Propagating High Temperature Synthesis

2012 ◽  
Vol 626 ◽  
pp. 138-142
Author(s):  
Saowanee Singsarothai ◽  
Vishnu Rachpech ◽  
Sutham Niyomwas
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
Steel Substrate ◽  
The Self ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Precursor Powders ◽  
Scanning Electron

The steel substrate was coated by Fe-based composite using self-propagating high-temperature synthesis (SHS) reaction of reactant coating paste. The green paste was prepared by mixing precursor powders of Al, Fe2O3and Al2O3. It was coated on the steel substrate before igniting by oxy-acetylene flame. The effect of coating paste thickness and the additives on the resulted Fe-based composite coating was studied. The composite coating was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) couple with dispersive X-ray (EDS).

Oxidation Resistance and Insulation of AlPO4/Al2O3 Coating on Tungsten Substrate at High Temperature

2017 ◽  
Vol 1142 ◽  
pp. 168-172
Author(s):  
Ai Ling Fan ◽  
Ying Kun Xue ◽  
Wei Tian Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Temperature ◽  
Composite Coating ◽  
Oxidation Resistance ◽  
Electronic Device ◽  
Sol Gel ◽  
Gel Method ◽  
Scanning Electron ◽  
Tungsten Substrate

To improve the oxidation resistance and insulation of tungsten electronic device at high temperature, an AlPO4/Al2O3 composite coating was synthesized on the tungsten substrate by sol-gel method. The morphology of coating was investigated by scanning electron microscopy (SEM). Compared to the blank specimens, the coated ones exhibit excellent oxidation resistance and insulation at about 1100, which can be attributed to the compact coating without porosity and crack. Up to 1200, the effects of coating became dramatically poor. The electron conductivity mechanism was discussed.

High Temperature Performance of Micro-plasma Sprayed CNTs/ Al2O3-TiO2 Composite Coating

2011 ◽  
Vol 26 (3) ◽  
pp. 239-243 ◽  
Author(s):  
Liu-Ying WANG ◽  
Zhuo XU ◽  
Shao-Chun HUA ◽  
Gu LIU
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
Temperature Performance ◽  
Plasma Sprayed

High-temperature oxidation and ablation behavior of plasma sprayed LaB6-MoSi2-TiB2 composite coating

2018 ◽  
Vol 152 ◽  
pp. 40-53 ◽  
Author(s):  
Changcong Wang ◽  
Kezhi Li ◽  
Qinchuan He ◽  
Caixia Huo ◽  
Xiaohong Shi
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Plasma Sprayed

scholarly journals Phase Transformation-Induced Improvement in Hardness and High-Temperature Wear Resistance of Plasma-Sprayed and Remelted NiCrBSi/WC Coatings

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1688
Author(s):  
Jin Sha ◽  
Liang-Yu Chen ◽  
Yi-Tong Liu ◽  
Zeng-Jian Yao ◽  
Sheng Lu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Composite Coating ◽  
Composite Coatings ◽  
Hardness Test ◽  
Wear Volume ◽  
Dispersion Strengthening ◽  
High Temperature Wear ◽  
Nicrbsi Coating ◽  
Plasma Sprayed

The remelting method is introduced to improve the properties of the as-sprayed NiCrBSi coatings. In this work, tungsten carbide (WC) was selected as reinforcement and the as-sprayed and remelted NiCrBSi/WC composite coatings were investigated by X-ray diffraction, scanning electron microscopy, hardness test and tribology test. After spraying, WC particles are evenly distributed in the coating. The remelting process induced the decarburizing reaction of WC, resulting in the formation of dispersed W2C. The dispersed W2C particles play an important role in the dispersion strengthening. Meanwhile, the pores and lamellar structures are eliminated in the remelted NiCrBSi/WC composite coating. Due to these two advantages, the hardness and the high-temperature wear resistance of the remelted NiCrBSi/WC composite coating are significantly improved compared with those with an as-sprayed NiCrBSi coating; the as-sprayed NiCrBSi coating, as-sprayed NiCrBSi/WC composite coating and remelted NiCrBSi/WC composite coating have average hardness of 673.82, 785.14, 1061.23 HV, and their friction coefficients are 0.3418, 0.3261, 0.2431, respectively. The wear volume of the remelted NiCrBSi/WC composite coating is only one-third of that of the as-sprayed NiCrBSi coating.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Sign in / Sign up

Export Citation Format

Share Document