نتایج جستجو برای: crack free chromium coating

تعداد نتایج: 593834  

2014
Kirsten Bobzin

The increasing demand on high quality optical systems with complex geometries, low tolerances and a low installation space necessitates new replicative production systems for complex optical glass elements. The technology precision blank moulding shows promising properties to comply with these demands on an industrial bulk production. Due to the required high surface quality and low surface rou...

2000
Kee Sung Lee Young-Woo Rhee Douglas H. Blackburn Brian R. Lawn Herzl Chai

The role of elastic mismatch in determining critical conditions for indentation fracture in brittle coatings on substrates of unlike modulus was investigated. A model transparent trilayer system, consisting of a glass coating layer bonded to a thick substrate of different glass or polymer by a thin layer of epoxy adhesive, facilitated in situ observations of crack initiation and propagation. A ...

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    Nowadays, suitable protective properties of tantalum nitride coatings, such as hardness, abrasion resistance and high corrosion resistance lead to increasing its application in medical engineering and improving the biological behavior of titanium and its alloys. In this research, nanostructured tantalum nitride coating was applied on the NiTi alloy by magnetron sputtering method. Then, the ...

2014
P. Sampath Kumaran

The surface modification processes such as hard facing, case carburizing, thermal spraying, ion nitriding, tough nitriding, and others, are some of the important techniques being adopted for providing enhanced life for parts and components, in service. Among them, plasma spray and High Velocity Oxy Fuel (HVOF) spray coatings are popular and widely used. In this investigation, plasma & High Velo...

2015
Ali Abdul-Aziz Ramakrishna T. Bhatt Joseph E. Grady ALI ABDUL-AZIZ RAMAKRISHNA T. BHATT JOSEPH E. GRADY

This article discusses results obtained from a parametric study to analytically evaluate the impingement of a crack at the interface of an environmental barrier coating (EBC) and a monolithic Silicon nitride (Si 3 N 4) layered ceramics substrate. The study establishes a correlation that leads to determine if the crack is arrested or advanced by either penetrating or deflecting along the EBC/sub...

2014
Xi-Shu Wang Xing-Wu Guo Xu-Dong Li Dong-Yun Ge

In this paper, rotating bending fatigue tests of 2024-T4 Al alloy with different oxide coatings were carried out. Compared to the uncoated and previously reported oxide coatings of aluminum alloys, the fatigue strength is able to be enhanced by using a novel oxide coating with sealing pore technology. These results indicate that the better the coating surface quality is, the more excellent the ...

From the standpoint of processing, hard chromium layer plate may be applied to steels, cast iron, aluminum and nickel base alloys. Cast iron can be plated provided that the surface is capable of conducting the required current and is reasonably free of voids, pits, gross silicate inclusions, and massive segregation. There are many difficulties arising from graphite phase and deposition of hydro...

Journal: :ACS applied materials & interfaces 2014
Vennesa O Williams Erica J DeMarco Michael J Katz Joseph A Libera Shannon C Riha Dong Wook Kim Jason R Avila Alex B F Martinson Jeffrey W Elam Michael J Pellin Omar K Farha Joseph T Hupp

Highly ordered, and conductive inverse opal arrays were made with silica and subsequently coated with tin-doped indium oxide (ITO) via atomic layer deposition (ALD). We demonstrate the utility of the resulting mesostructured electrodes by further coating them with nickel oxide via ALD. The NiO-coated arrays are capable of efficiently electrochemically evolving oxygen from water. These modular, ...

2004
Herzl Chai

The competition between transverse surface and sub-surface cracks in a thin, hard coating bonded to polycarbonate substrate due to spherical indentation is investigated in real-time as a function of coating thickness and indenter radius. Fine grain (Y-TZP) and medium grain (alumina) ceramics and pre-abraded amorphous glass are used for the coating. As the coating thickness is reduced, the famil...

An investigation of the friction and sliding wear of gray cast iron against chromium plated cast irons was carried out on a newly constructed reciprocating friction and wear tester. The tests were the first to be done on the test rig under dry conditions and at the speed of 170 cm/min, and variable loads of 20-260 N for a duration of 15 min. to 3 hours. The gray cast iron surfaces worn by a pro...

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