Evaluation of adhesion strength of thin hard coatings

Arai, Toru; Fujita, Hideyuki; Watanabe, M.

doi:10.1016/0040-6090(87)90381-6

Cited by 99 publications

(33 citation statements)

References 12 publications

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“…Generally, mechanical parts that require low friction and low wear are coated with hard films such as hard Cr plating film (Ref [1][2][3]. This is because hard Cr plating film can be formed comparatively easily and cheaply.…”

Section: Introductionmentioning

confidence: 99%

Hard α-Al2O3 Film Coating on Industrial Roller Using Aerosol Deposition Method

et al. 2014

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It is well known that a-Al 2 O 3 forms very hard, highly insulating, smooth films. There is demand for the use of such films instead of conventional hard, smooth films; For example, industrial rollers such as calendering rollers etc. are always required to have a harder and smoother surface than conventional rollers. Therefore, this work investigated the specification of a-Al 2 O 3 films, e.g., their wear resistance and chemical stability, using various tests. This paper also discusses whether a-Al 2 O 3 film can take the place of Cr plating film as a hard, smooth film by comparing their wear resistance and chemical stability.

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Section: Introductionmentioning

confidence: 99%

Hard α-Al2O3 Film Coating on Industrial Roller Using Aerosol Deposition Method

et al. 2014

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“…It can be seen that the Hi-P deposit showed a smooth and complete punched surface, while the Lo-P deposit had a radial crack marks ridden punched surface. According to the referenced papers, 20,23) the adhesion strength for the Hi-P indeed is higher than the Lo-P. Furthermore, the adhesion strength and adhesive failure mechanism analysis could be corroborated by means of the acoustic emission patterns along the scratch tracks under an increasing load (0$100 N) and at a load rate of 1.67 N/s with a scratch length of 10 mm, as shown in Fig.…”

Section: Characteristics Of Hi-p and Lo-p Depositsmentioning

confidence: 62%

“…Also, a Rockwell-C indenter with a load of 980 N was utilized to analyze and compare the surface adhesion of EN deposits. 20) According to ASTM G85 21) and ASTM B117 standards, 22) a salt spray tester (model GSST-060) was utilized to perform corrosion damage test in this work. The testing conditions mainly consisted of 5 mass% NaCl liquid solution and testing temperature of 308 K (35 C).…”

Section: Methodsmentioning

confidence: 99%

Effects of Thickness of Electroless Ni-P Deposit on Corrosion Fatigue Damage of 7075-T6 under Salt Spray Atmosphere

Hsu

Chiu

Shih³

2004

Mater. Trans.

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Fatigue tests under reversed flexure have been conducted on samples of 7075-T6 Al-alloy with the application of electroless Ni-P deposits of thickness ranging from 5 to 50 mm after salt spray corrosion (100, 500 and 1000 hours). The corrosion damage of the coated and uncoated samples was determined through the measurement of the mass loss and surface corroded morphology. The mean microhardness of the high phosphorous (Hi-P) deposits in 5, 25 and 50 mm thickness were found to be 334, 457 and 606 Hv 50 , and the mean surface roughness (Ra) were measured at 0.197, 0.217 and 0.223 mm for 5, 25 and 50 mm thickness, respectively. The salt spray tests revealed that the corrosion damage increases as the exposure time increases for the 5 mm coating. The corrosion damage literally stopped when the coating thickness was increased to 25 mm. The fatigue strength of the coated samples was found decrease slightly as the deposit thickness increases to 25 mm, whereas the reduction on the fatigue strength for the 50 mm deposit is significant. It has been observed that the reduction in the fatigue strength is less or to none for the thicker coating system. For the 5 mm Hi-P deposit sample, the fatigue crack initiation started at the surface corrosion pitting then extending to the substrate and onto failure, this phenomenon reduced the fatigue strength as compared to the uncoated samples. The fatigue strength is decreased slightly as the thickness increases to 25 mm and 50 mm. With or without corrosion damage, the fatigue crack initiation all started from the coating and extended to the substrate through the bonding between the coating and the substrate. Balancing between the need for the corrosion resistance and the fact on the fatigue strength reduction, the optimum coating thickness seems to be greater than 5 mm but less than 25 mm for the aerospace alloy 7075-T6 Al-alloy.

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“…The adhesion of a-SiC:H was measured using the scratch test [9,10]. A diamond tip was pulled across the coated substrate with a variable normal load at a constant velocity.…”

Section: Adhesion Measurementmentioning

confidence: 99%

Improvement of stenting therapy with a silicon carbide coated tantalum stent

Amon

Bolz

Schaldach

1996

J Mater Sci: Mater Med

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State of the art cardiovascular stent materials are a compromise between bulk properties and surface related properties. As a consequence, deficiencies in both characteristics lead to serious limitations of stenting therapy. Beside a dissatisfying X-ray visibility of current stent materials, which hinders precise angiographic control of the stent during implantation, insufficient hemocompatibility causes subacute vessel occlusions despite stringent anticoagulant medication. Additionally, bleeding complications result which further limit the therapeutical success. Therefore it is essential to develop a new coronary stent with improved material properties for the bulk of the stent and its surface. This is realized by a hybrid concept. The stent is manufactured from tantalum, having a high inherent radio-opacity. The stent is coated with amorphous silicon carbide, optimized for hemocompatibility. An appropriate deposition technology to maximize coating adhesion was developed. Amorphous silicon carbide was investigated in vitroand in vivoto assess its suitability for coronary stents.

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Evaluation of adhesion strength of thin hard coatings

Cited by 99 publications

References 12 publications

Hard α-Al2O3 Film Coating on Industrial Roller Using Aerosol Deposition Method

Hard α-Al2O3 Film Coating on Industrial Roller Using Aerosol Deposition Method

Effects of Thickness of Electroless Ni-P Deposit on Corrosion Fatigue Damage of 7075-T6 under Salt Spray Atmosphere

Improvement of stenting therapy with a silicon carbide coated tantalum stent

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