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Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    1286
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1286

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Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    805
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 805

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    2-7
Measures: 
  • Citations: 

    0
  • Views: 

    1020
  • Downloads: 

    0
Abstract: 

WC-17Co coatings were deposited onto mild steel substrate using HVOF spray technique. The coated specimens were then heat-treated at different temperatures in a vacuum chamber. The coatings were studied in the as sprayed and heat treated conditions. Metallographic examination by Optical scanning, electron microscopes and XRD analysis indicated that some brittle eta phases were produced at high temperature heat-treatment. Generation of these phases increased the hardness of the coatings. The indentation fracture toughness of the coatings has also been studied. This method showed that these coatings exhibited anisotropic crack propagation parallel to the coating / substrate interface. The cracks propagate at the regions of low fracture toughness appeared to be at the boundary of the fully-melted region of the split and its inner partially melted core. The high amount of brittle eta phases decreases the fracture toughness of heat-treated coatings at high temperatures.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1020

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    9-20
Measures: 
  • Citations: 

    1
  • Views: 

    1330
  • Downloads: 

    0
Abstract: 

The aim of this studies the simultaneous imprudent of the corrosion behavior and biocompatibility of metallic implant and bone Osseo integration simultaneously. Stainless steel 316L (SS) was used as metallic substrate and after surface- treatment with 15% sulfuric acid was coated with hydroxyapatite coating employing plasma-spraying process. Structural characterization techniques including XRD, SEM, and EDX were also utilized to investigate the microstructure, morphology, and crystallinity of the coating. Electrochemical potentiodynamic tests were performed in two types of physiological solutions in order to determine and compare the corrosion resistance behavior of the coated and uncoated specimens as an indication of biocompatibility.The results indicate that the surface treatment and hydroxyapatite coating improve the corrosion resistance behavior of SS. The corrosion current density of the surface treated and the hydroxyapatite coated SS also decrease. These also show that surface-treated and hydroxyapatite-coated SS can be used as human body implants with the goals of corrosion resistance improvement (biocompatibility) and bone osseointegration simultaneously.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1330

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    21-29
Measures: 
  • Citations: 

    0
  • Views: 

    1251
  • Downloads: 

    0
Abstract: 

Silica coating was deposited on nickel substrate by sol-gel process and the structures along with the composition were evaluated. The sols were made from silicon alkoxide, ethanol, water and acid catalyst including HCL. To produce adherent silica coatings on nickel, various additives such as surfactant, viscose additive and drying control chemical additives were introduced to the system, and appropriate drying and firing cycles were applied after dipping in solution. The hot corrosion and oxidation resistance of coating at different temperatures was investigated. The structure and uniformity of the coatings were examined by scanning electron microscopy, EDAX and GDOS. The results indicate that uniform coating of alumina silica can be produced on nickel substrate by optimizing composition and process variables of the sol. Coatings can protect substrates from oxidation and hot corrosion at different temperature up to 1000°C but is not much effective for hot corrosion resistance at 10000°C.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1251

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    31-42
Measures: 
  • Citations: 

    0
  • Views: 

    813
  • Downloads: 

    0
Abstract: 

In this research, development of novel Ti-Ni intermetallic coatings on carbon tool steels has been investigated. For this purpose, nickel coatings as thickness of 20 mm were electrodeposited on steel specimens.Subsequently precoated specimens were titanized for a period of 6hs in an optimized pack cementation mixture of ferrotitanium, aluminium oxide, and ammonium choloride. In order to obtain the optimum intermetallic coatings and to reduce the compositional and hardness profile gradients, diffusion annealing process was performed on the specimens in an argon- controlled atmosphere. The microstructure and the phases developed in the coating were identified by metallography, microhardness, X-ray diffraction, and glow discharge optical spectroscopy techniques. Experimental results indicated that six distinct layers had been developed on the surface. The intermetallic compound layer of Ti2Ni was formed on the first surface and TiNi, TiNi3, TiNi , Ti2Ni+Ti(a) and FeNi compound layers formed werre beneath the surface.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 813

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Author(s): 

MEHRJOU H.R. | Edriss H.

Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    43-54
Measures: 
  • Citations: 

    0
  • Views: 

    800
  • Downloads: 

    0
Abstract: 

This research is dedicated to the influence of different technological factors on wear and corrosion behaviors of flame sprayed Alumina-Titania coatings of low carbon steel substrate. Samples were studied using optical microscope, scanning electron microscope and x-ray diffraction method. Investigation showed that structure of coatings involved different allotropic forms of Al2O3 either stable phase (a) or meta stable phases (y,k) and TiO2. There were a low amount of MgO and SiO2 in the cord as self-fluxing agents and also as reducing agents for the melting point of alumina. Microhardness, wear and corrosion test were performed to characterize the coatings. Wear results showed that depending on each factor employed, wear resistance of coatings were different. Corrosion examination was performed as immersion extrapolation tafel tests at 3.5 % NaCl solution. Electrochemical examination results showed that corrosion rates of coated samples were obviously less than that of normal steel and immersion test results demonstrated that because of present of porosity and microcracks in the coatings, localized corrosion can occurre on the substrate.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 800

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    55-65
Measures: 
  • Citations: 

    0
  • Views: 

    1299
  • Downloads: 

    0
Abstract: 

After nitriding of stainless steel by using plasma method at low temperature a duplex hard layer (YN1 premier layer and YN2 sublayer) is produced on the steel surface. About the formation of these sublayer differences hypotheses was proposed in the literatures. Some of them suggested that the formation of YN2 phase is caused by stress-assisted diffusion. Some of them proposed that the YN2 sublayer is formed during the slow cooling of the substrate after nitriding. The result of this paper show that the formation of YN2 layeris not connected to the cooling state and stress- ssisted diffusion. It is result of ion bombardment of cleaning procedure.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1299

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Issue Info: 
  • Year: 

    2005
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    67-72
Measures: 
  • Citations: 

    0
  • Views: 

    818
  • Downloads: 

    0
Abstract: 

Nitriding in H2/NH3 atmosphere was used as a post-treatment for electro less Ni-P coatings on a low- alloy steel substrate. High phosphorous (9%) coatings as thick as 2, 24, and 48 m were applied and the effect of nitriding on the structural changes, micro hardness profile and the wear resistance of the coatings was studied. The wear behavior of the nitridedl Ni-P coated samples was assessed by comparing them with nitrided samples. The pin-on-disc test was used to evaluate the wear characteristics of coatings produced under 40 and 80 N loads.It was concluded that the effect of nitriding depended on the thickness of the coatings. The 2 mm Ni-P coated steel showed better wear resistance compared with the 24 mm Ni-P coated steel under higher load. This behaviour was related to the formation of nitride phases as well as nitrogen diffusion zone at the surface regions of the thin Ni-P coated steel.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 818

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