Ni-P-Diamond Composite Coating on Friction Shims

2013 ◽  
Vol 652-654 ◽  
pp. 1862-1865
Author(s):  
Hua Chen ◽  
Hai Ying Sun ◽  
Su Qiu Jia
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Electroless Plating ◽  
Scratch Test ◽  
Friction Coefficients ◽  
Diamond Composite ◽  
Diamond Particles

Ni-P diamond particles (20μm) composite coating on friction shims were prepared by electroless plating. Morphology and phase composition of the composite coating were measured by SEM with EDS and XRD. The friction coefficient of the coating was test with scratch test. The results showed that diamond particles distribution was uniform and not stacked by two steps for 10 min. The diamond particles were half embedded in the Ni-P substrate. The element of the coating was Ni,P,C and the phase composition was Ni and diamond. Adhesion of the composite coating was higher than that of the Ni-P coating. Friction coefficients of the Ni-P coating and Ni-P composite coating were 0.47 and 0.18. Half –naked diamond particles played a pinning role and prevented from wear of the coating to get the big friction coefficient and good wear resistance. This Ni-P composite coating on friction shims would improve friction shims technology and realize the production of localization of friction shims.

Electroless Plating of Ni-P-CNTs Composite Coating

2007 ◽  
Vol 280-283 ◽  
pp. 1445-1448 ◽  
Author(s):  
Guo Gang Zhao ◽  
Fu Ming Deng
Keyword(s):  
Carbon Nanotubes ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Surface Morphology ◽  
Composite Coating ◽  
Coefficient Of Friction ◽  
Electroless Plating ◽  
Structure And Properties ◽  
Plating Bath ◽  
The Coefficient Of Friction

Ni-P-CNTs composite coating were deposited by electroless plating. The factors which influenced the content of carbon nanotubes in deposits, such as the types of agitation, surfactants and carbon nanotubes concentration in the plating bath, were examined. The surface morphology, structure and properties, such as microhardness, wear resistance and friction coefficient of the -CNTs coating, were investigated. The results showed that the Ni-P-CNTs composite coating greatly increased the hardness and wear resistance and decreased the coefficient of friction with the increase of the content of carbon nanotubes in deposits, and the introduced carbon nanotubes did not change the structure of the Ni-P marix of the composite coating.

scholarly journals Influence of nano-SiO2 on the bonding strength and wear resistance properties of polyurethane coating

2019 ◽  
Vol 26 (1) ◽  
pp. 77-83 ◽  
Author(s):  
Fangfang Wang ◽  
Lajun Feng ◽  
Huini Ma ◽  
Zhe Zhai ◽  
Zheng Liu
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Composite Coating ◽  
Network Structure ◽  
Bonding Strength ◽  
Coating Layer ◽  
Steel Substrate ◽  
Polyurethane Coating ◽  
Nano Sio2

Abstract To improve the wear resistance of polyurethane (PU) coating and its adhesion to the steel substrate, a series of simple and practicable techniques were designed to mix nano-SiO2 with PU powder to cast a coating layer onto the steel. When the addition of nano-SiO2 was small, a network structure of PU-SiO2 was produced. It improved the wear resistance of the composite coating and its adhesion to the steel substrate. When the addition of nano-SiO2 was excessive, agglomerated nano-SiO2 particles not only affected the bond between the PU resin and the steel substrate but also became abrasive materials, intensifying the abrasion of the composite coating during friction. It resulted in lower bonding strength and poorer wear resistance of the composite coating. The wear rate and friction coefficient of 2 wt.% SiO2/PU composite coating were 1.52×10−6 cm3/min N and 0.31, respectively. Its wear resistance was about 10 times as high as that of the pure PU coating. Furthermore, a simple and practicable installation was designed to test the bonding strength between the coating and the steel substrate. The bonding strength between 2 wt.% SiO2/PU composite coating and the steel substrate was 7.33 MPa, which was 39% higher than that of the pure PU coating.

MICROSTRUCTURE AND WEAR PROPERTIES OF LASER CLAD TiB2 + TiC/Fe COMPOSITE COATING

2012 ◽  
Vol 19 (05) ◽  
pp. 1250052 ◽  
Author(s):  
X. H. WANG ◽  
M. ZHANG ◽  
B. S. DU ◽  
S. LI
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Volume Fraction ◽  
Composite Coatings ◽  
Wear Properties ◽  
Friction Coefficients ◽  
Iron Based

Iron-based composite coatings reinforced with TiB2–TiC multiple ceramic have been fabricated from a precursor of B4C , TiO2 and Al powders by laser cladding. The effect of TiO2 and Al on the microstructure and wear properties of the coatings was investigated. The results showed that the volume fraction, type and size of the reinforcements were influenced by the content of TiO2 and Al . TiB2 and TiC were evenly distributed in the coating; however, most of Al2O3 were ejected from the coatings, only few of them retained in the coating acting as nucleation core of reinforcement or inclusion. The microhardness and wear resistance of the coatings were improved, whereas the friction coefficients of the coatings were considerably lower than that of substrate.

Microstructure and Property of Novel γ-Fe/ (Cr, Fe)7C3 Lamellar Eutectics Reinforced Composite Coating

2021 ◽  
Vol 871 ◽  
pp. 134-143
Author(s):  
Yin Hua Shi ◽  
Qin Shi
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Composite Coating ◽  
Carbon Fibers ◽  
Steel Surface ◽  
Surface Hardness ◽  
Lamellar Eutectic ◽  
Reinforced Composite ◽  
Metallurgical Bonding ◽  
16Mn Steel

γ-Fe/(Cr, Fe)7C3 lamellar eutectics reinforced the composite coating was deposited onto the 16Mn steel surface to enhance its surface hardness and wear resistance. The microstructure, phase composition, microhardness as well as wear resistance of the cladding coating were explored. Results indicated that the coating showed the dense and defect-free metallurgical bonding with the substrate and mainly consisted of (Cr, Fe)7C3, γ-Fe/(Cr, Fe)7C3 lamellar eutectic, B4C and carbon fibers. (Cr, Fe)7C3, B4C and carbon fibers were tightly embedded in the γ-Fe/(Cr, Fe)7C3 lamellar eutectics matrix. The microhardness and wear resistance of the coating compared with that of the substrate were highly improved by nearly 5 and 3 times, respectively.

Modification of Silumin Using the Electroexplosive Method

2017 ◽  
Vol 906 ◽  
pp. 56-62
Author(s):  
Anatolii A. Klopotov ◽  
Yu.F. Ivanov ◽  
E.A. Petrikova ◽  
V.E. Gromov ◽  
Yu.A. Kakushkin
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Phase Composition ◽  
Friction Coefficient ◽  
Surface Properties ◽  
Thermodynamic Analysis ◽  
Aluminum Foil ◽  
Electrical Explosion ◽  
Equilibrium Conditions ◽  
Physical Mechanisms

Surface modification of silumin of the grade AK12 with plasma formed during an electrical explosion of aluminum foil with a sample of yttrium oxide powder placed in the explosion region (the electroexplosive doping method) is carried out. The thermodynamic analysis of the system Al-Si-Y-O is carried out. The phases formed in this system under equilibrium conditions are revealed. Investigations of the elemental and phase composition and the defective substructure are carried out. Mechanical (microhardness) and tribological (wear resistance and friction coefficient) tests of the modified material are performed. The physical mechanisms responsible for multiple enhancement of surface properties of the modified silumin samples are revealed.

A Ni/Surface-Modified Diamond Composite Electroplating Coating on Superelastic NiTi Alloy as Potential Dental Bur Design

2009 ◽  
Vol 610-613 ◽  
pp. 1339-1342 ◽  
Author(s):  
Hui Min Zhou ◽  
Qing Fen Li ◽  
Li Li ◽  
Yu Feng Zheng
Keyword(s):  
Wear Resistance ◽  
Niti Alloy ◽  
Performance Comparison ◽  
Diamond Composite ◽  
Alloy Substrate ◽  
Future Design ◽  
Diamond Particles ◽  
Pin On Disc ◽  
The One ◽  
Surface Modified

Dental diamond bur is now a regular rotary tool, with its head made of diamond particles embedded into nickel coating, and its shank made of stainless steel. There are strong demands from the dentist on prolongation of usage life and avoiding of breakage. To solve this problem, on the one hand, since diamond is hard to be wetted under the condition of normal temperature and pressure due to the high interfacial energy between diamond and general metals and alloys. Diamond particles coated with titanium layer was used for the preparation of composite electroplating with the intention of improving the interfacial adhesion between diamond and metal matrix; on the other hand, superelastic biomedical NiTi alloy was used as the substrate to improve the flexibility and prevent the breakage. In this study, the optimal preparation parameters of Ni/surface-modified diamond electroplating were determined by orthogonal test, and the bonding conditions between the diamond particles and the NiTi alloy substrate were studied by scanning electron microscope. Further performance comparison of Ni/modified and Ni/un-modified diamond composite electroplating was conducted on a pin-on-disc wear machine under the dry sliding condition, and the material removal volume was used as the evaluating criterion of wear resistance. The results showed that the binding strength between diamond particles and NiTi alloy substrate could be enhanced, as well as the wear resistance, which may give direction on the future design of dental bur.

scholarly journals Study on Microstructure and Tribological Performance of Diamond/Cu Composite Coating via Supersonic Laser Deposition

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 276
Author(s):  
Lijuan Wu ◽  
Gang Zhang ◽  
Bo Li ◽  
Weilin Wang ◽  
Xuanjie Huang ◽  
...  
Keyword(s):  
Phase Composition ◽  
Composite Coating ◽  
Laser Power ◽  
Adhesive Bonding ◽  
Velocity Ratio ◽  
Deposition Efficiency ◽  
Laser Deposition ◽  
Micro Hardness ◽  
Diamond Particles ◽  
Supersonic Laser Deposition

The supersonic laser deposition (SLD) of diamond/Cu composite powder is studied over a range of laser power. The deposition efficiency, coating microstructure, cohesive/adhesive bonding, phase composition, micro-hardness, and tribological property of the diamond/Cu composite coating are investigated. The results indicate that, as laser power is increased, deposition efficiency initially increases and then declines. The diamond particles distribute uniformly in the composite coating. Due to the increase of velocity ratio and total energy by laser irradiation, the cohesive/adhesive bonding of the composite coating is improved. The composite coating can preserve the phase composition of the origin powders due to the relatively low heat input during the SLD process. Slight oxidation of the Cu powder can be detected in the coatings prepared with high laser power, which has adverse effects on material deposition. The SLD-diamond/Cu composite coating has superior wear-resistance because of low friction coefficient, high micro-hardness, and uniformly distributed diamond particles.

scholarly journals Wear Behaviors of TiN/WS2 + hBN/NiCrBSi Self-Lubricating Composite Coatings on TC4 Alloy by Laser Cladding

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 747
Author(s):  
Kaiwei Liu ◽  
Hua Yan ◽  
Peilei Zhang ◽  
Jian Zhao ◽  
Zhishui Yu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Laser Cladding ◽  
Sliding Wear ◽  
Composite Coatings ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
X Ray ◽  
Tc4 Alloy

TiN and WS2 + hBN reinforced Ni-based alloy self-lubricating composite coatings were fabricated on TC4 alloy by laser cladding using TiN, NiCrBSi, WS2, and hBN powder mixtures. Energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and optical microscopy (OM) were adopted to investigate the microstructure. The wear behaviors of the self-lubricating composite coatings were evaluated under large contact load in room temperature, dry-sliding wear-test conditions. Results indicated that the phases of the coatings mainly include γ-Ni, TiN, TiNi, TiW, WS2, and TiS mixtures. The average microhardness of the composite coating is 2.3–2.7 times that of the TC4 matrix. Laser cladding TiN/WS2 + hBN/NiCrBSi self-lubricating composite coatings revealed a higher wear resistance and lower friction coefficient than those of the TC4 alloy substrate. The friction coefficient (COF) of the coatings was oscillating around approximately 0.3458 due to the addition of self-lubricant WS2 + hBN and hard reinforcement TiN. The wear behaviors testing showed that the wear resistance of the as-received TC4 was significantly improved by a laser cladding TiN/WS2 + hBN/NiCrBSi self-lubricating composite coating.

EVALUATION OF TRANSFORMED LAYER HARDNESS OF DLC COATING AFTER FRICTION TEST

2016 ◽  
Vol 78 (10-3) ◽  
Author(s):  
Nor Azmmi Masripan ◽  
Yosuke Tsukiyama ◽  
Kenji Ohara ◽  
Noritsugu Umehara ◽  
Hiroyuki Kousaka ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Scratch Test ◽  
Tribological Performance ◽  
Diamond Like Carbon ◽  
Friction Test ◽  
Friction Behavior ◽  
Sliding Interface ◽  
Dlc Coating

Diamond-like carbon (DLC) provide very excellence performance in term of friction coefficient and wear resistance under boundary   lubrication. the  nano characteristic of the transformed  layer has not  been studied  in terms  of its  hardness  which is believed to  have a significant  effect in the tribological  performance. This study presented the scratch test of the DLC transformed layer was obtained from the AFM scratch test that governs the friction behavior of DLC. As a result, the hardness of the DLC transformed layer depends on the oil temperature, where the sliding interface of DLC softened during the friction test due to graphitization process

Wear Resistance of a Large Thick Fe Based Amorphous Composite Coating Deposited by Laser Cladding

2018 ◽  
Vol 913 ◽  
pp. 390-395
Author(s):  
Yong Tian Wang ◽  
Jia Wei Mo ◽  
Lu Lu Tao
Keyword(s):  
Wear Resistance ◽  
Phase Composition ◽  
Electron Microscope ◽  
Composite Coating ◽  
Laser Cladding ◽  
Steel Substrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardness Tester ◽  
Scanning Electron

A large thick Fe based amorphous composite coating was deposited on the carbon steel substrate by laser cladding method. The phase composition and microstructure are characterized using X-ray diffraction and scanning electron microscope, respectively. The results demonstrate that the large thick laser cladding coating has a typical layered structure mainly consisting of amorphous and nanocrystal phases. The wear resistance and microhardness property are tested by the Vickers hardness tester and MLS-225 type wet sand rubber wheel abrasion tester. The results show that the large thick laser cladding coating has excellent wear resistance and hardness.

Sign in / Sign up

Export Citation Format

Share Document