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V.V.N Reddy

Bio: V.V.N Reddy is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Composite number & Particle size. The author has an hindex of 1, co-authored 1 publications receiving 95 citations.

Papers
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Journal ArticleDOI
01 Apr 2000-Wear
TL;DR: In this article, the effect of heat treatment, particle size and phosphorus content on the wear characteristics of composite electroless coating containing diamond particles was investigated and the results indicated substantial increase in wear resistance after the coated sample containing 9-10 wt% P content having fine diamond particle size is annealed around 350°C.

103 citations


Cited by
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Journal ArticleDOI
TL;DR: The development of metal deposition processes based on electroless nickel, alloy and composite coatings on various surfaces has witnessed a surge in interest among researchers, with many recent applications made possible from many excellent properties as mentioned in this paper.

680 citations

Journal ArticleDOI
TL;DR: In this paper, the authors outline the development of electroless Ni-P composite coatings and highlight the method of formation, mechanism of particle incorporation, factors influencing particle incorporation and the effect of incorporation on the structure, hardness, friction, wear and abrasion resistance, corrosion resistance, high temperature oxidation resistance, and their applications.
Abstract: This review outlines the development of electroless Ni–P composite coatings. It highlights the method of formation, mechanism of particle incorporation, factors influencing particle incorporation, effect of particle incorporation on the structure, hardness, friction, wear and abrasion resistance, corrosion resistance, high temperature oxidation resistance of electroless Ni–P composite coatings as well as their applications. The improvement in surface properties offered by such composite coatings will have a significant impact on numerous industrial applications and in the future they will secure a more prominent place in the surface engineering of metals and alloys.

359 citations

Journal ArticleDOI
TL;DR: In this article, the influence of pre-etch phosphorus composition and etching method on the resulting morphology, composition and reflectance of the black surface produced has been examined and an optimum phosphorus composition was proposed to produce low reflectance blacks of 0.4% or lower in the visible region.
Abstract: Novel insights into the manufacture of nickel–phosphorus black surfaces by chemical etching of electroless-deposited Ni–P alloy has been achieved by examining the influence of pre-etch phosphorus composition and etching method on the resulting morphology, composition and reflectance of the black surface produced. An optimum phosphorus composition and etching regime to produce low reflectance blacks of 0.4% or lower in the visible region is proposed. Cross-sectional analysis of the etched surface has allowed, for the first time, an accurate determination of the scale of the enhanced morphologies produced and the thickness of the oxidised black layer itself. AFM studies have also provided information on the phase structure of the as-deposited Ni–P alloy.

108 citations

Journal ArticleDOI
TL;DR: In this article, the Ni-P-ND composite coating was prepared from a suspension of diamond nanoparticles in an electroless bath, and the tribological properties, hardness and corrosion behaviours of the composite coating on medium carbon steels were investigated.
Abstract: Nanometer Diamond (ND) was synthesized by using the detonation method. It was a kind of materials with properties of diamond and nanometer particle. The Ni–P–ND composite coating was prepared from a suspension of diamond nanoparticles in electroless bath. The tribological properties, hardness and corrosion behaviours of the composite coating on medium carbon steels were investigated. The Ni–P–ND composite coating exhibits not only high wear resistance but also low friction coefficient compared with the Ni–P composite coating. The highest microhardness of the Ni–P–ND composite coating was obtained by heat treated at 673 K. The corrosion resistance of Ni–P–ND composite coating is superior to that of Ni–P coating. The mechanisms of improvement of the tribological and electrochemical properties of the electroless composite coating are also discussed.

87 citations

Journal ArticleDOI
Zhi Yang1, Hui Xu1, Mengke Li1, Yan-Li Shi1, Yi Huang1, Hu-Lin Li1 
TL;DR: In this article, the tribological properties of the composite coatings were investigated by a friction and wear tester, and it was noted that amorphous Ni/P/SWNTs composite coating provided higher corrosion resistance than the polyamide-based Ni-P coating.

78 citations