The Experts below are selected from a list of 21585 Experts worldwide ranked by ideXlab platform
A K Chattopadhyay - One of the best experts on this subject based on the ideXlab platform.
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study on the role of pvd tin coating in improving the performance of electroplated monoLayer superabrasive wheel
Surface & Coatings Technology, 2010Co-Authors: Debajyoti Bhaduri, A K ChattopadhyayAbstract:Abstract The monoLayer grinding wheels, coated with a physical vapour deposited (PVD) coating (viz. TiN, HfN, TiN + ZrN etc.), have been reported to outperform their uncoated counterparts as claimed in some patented literatures. The present work aims at exploring the mechanism how PVD TiN augments the performance of Nickel electroplated monoLayer superabrasive wheels. This study also includes the effect of negative substrate bias voltage on performance of TiN coated electroplated cBN wheels during grinding of hardened bearing steel. TiN was deposited by pulsed DC closed-field unbalanced magnetron sputtering (CFUBMS) technique in an in-house PVD coating system. The structure of the TiN coating and post-grinding condition of the wheels were observed using scanning electron microscopy (SEM). Energy dispersive X-ray (EDX) line scan, Electron probe micro analysis (EPMA) and secondary ion mass spectrometry (SIMS) depth profiling at the junction of TiN and Nickel Layer indicated the occurrence of inter-diffusion between them and grazing incidence X-ray diffraction (GIXRD) confirmed the formation of Ni–Ti intermetallic phases at their interface. The scratch test revealed a significant increase in cohesive and adhesive strengths of Nickel Layer when TiN was deposited at a bias voltage of −60 V or beyond that. The uncoated cBN wheel exhibited large number of grit fracture at the bond level and some grit pull-out. Such failures of grit were significantly arrested with TiN coating deposited at the bias voltages of −60 V and −90 V.
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effect of pulsed dc cfubm sputtered tin coating on performance of Nickel electroplated monoLayer cbn wheel in grinding steel
Surface & Coatings Technology, 2010Co-Authors: Debajyoti Bhaduri, A K ChattopadhyayAbstract:Abstract The present research involves the deposition of pulsed DC CFUBM sputtered TiN on Nickel plated steel discs and electroplated monoLayer cBN wheels at seven different target frequencies and ten different bias voltages separately. The coating microstructures and the interaction between TiN and Nickel were studied using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and electron probe micro analysis (EPMA). Phase detection was carried out using grazing incidence X-ray diffraction (GIXRD) technique. The cohesive and adhesive strengths of Nickel Layer were assessed by scratch test. After grinding of low carbon steel (AISI 1020) and hardened bearing steel (AISI 52100), the conditions of the uncoated and coated cBN wheels were observed under Stereo Zoom Microscope and SEM. Average column size of TiN was found to decrease with increase in both target frequency and negative bias voltage. The structure of the coating gradually transformed from porous and open columnar (at 0 V bias) to very compact, dense and featureless (at − 80 V bias). EDX line scan and EPMA confirmed the cross-diffusion between TiN and Nickel and GIXRD indicated the formation of Nickel–titanium intermetallic phases at their interface. The cohesive strength of Nickel Layer was not effectively enhanced with increase in target frequency, whereas the same was significantly improved with increase in negative bias voltage. Seemingly, TiN coated wheel could not perform better than the uncoated wheel in grinding AISI 1020 steel due to high wheel loading. However, the uncoated wheel was found to undergo fracture wear, which was remarkably absent in the coated wheels. On the other hand, many fractured grits and some grit pull-out were observed in the uncoated wheel when grinding AISI 52100 steel, whereas almost no pull-out along with much less fractured grits were observed in the wheels coated at bias voltages like − 60 V and − 90 V.
Qian Liming - One of the best experts on this subject based on the ideXlab platform.
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multiply super anti corrosion Nickel plating chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model discloses a multiply super anti -corrosion Nickel plating - chromium part and manufacturing method, wherein multiply super anti -corrosion Nickel plating - chromium part includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, and the basal Layer, it is on the copper plate, and the functional Layer, it is on the basal Layer, and wherein the functional Layer includes electronegative potential Nickel dam and the microporous Nickel Layer on the electronegative potential Nickel dam, and the decorative Layer, it is on the microporous Nickel Layer, and the decorative Layer is the arbitrary of trivalent chromium cladding material or hexavalent chromium cladding material. The utility model discloses an on the surperficial micropore that provides of parts, chromium plating process basis, increase the electronegative potential Nickel coating to the corrosion resisting property of corrosion resisting property, the especially trivalent chromium product of product is improved, the more large -scale popularization and application of trivalent chromium product of more environmental protection can be makeeed.
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Nickel plating with or chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model discloses a Nickel plating with or chromium part, this part includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, the functional Layer, it is on the copper plate, and wherein the functional Layer includes electronegative potential Nickel dam and the microporous Nickel Layer on the electronegative potential Nickel dam, and the decorative Layer is on its formation and the microporous Nickel Layer. The utility model discloses a plate common microporous Nickel Layer and the electronegative potential Nickel dam that sets up in a top Layer to very big improvement holistic corrosion resistance of part and stability, can also have good bright planarization simultaneously, cladding material combines effectually.
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super anti corrosion Nickel plating chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model relates to a super anti-corrosion Nickel plating -chromium part belongs to and electroplates technical field. It includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, with half light Nickel dam, it is on the copper plate, with full gloss Nickel dam or husky butyl's Nickel dam, it is formed at half light Nickel dam, and the functional Layer, it is on full gloss Nickel dam or husky butyl's Nickel dam, and wherein the functional Layer includes electronegative potential Nickel dam and the microporous Nickel Layer on the electronegative potential Nickel dam, and the decorative Layer, it is on the microporous Nickel Layer. Potential difference between electronegative potential Nickel dam and the microporous Nickel Layer is 10-120mv, the electronegative potential Nickel dam in high-sulfur Nickel dam, crazing line Nickel dam the one deck or two-Layer between the complex, when adopting the crazing line with high-sulfur Nickel composite plating, the potential difference is 10-80mv between crazing line and the high-sulfur Nickel. The outward appearance of both having guaranteed part microporous Nickel Layer is bright, makes it have super high corrosion resistance, hardness, wearability again.
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Nickel chromium plating part and manufacturing method thereof
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The invention discloses a Nickel-chromium plating part and a manufacturing method thereof. The Nickel-chromium plating part includes a substrate, a pretreatment coating, a base Layer, a functional Layer and a decorative Layer. The pretreatment coating is deposited on the entire substrate, and a copper plate Layer is formed on the pretreatment coating; the base Layer is formed on the copper plate Layer; the functional Layer is formed on the base Layer and includes a low potential Nickel Layer and a microporous Nickel Layer formed on the low potential Nickel Layer; and the decorative Layer is formed on the microporous Nickel Layer and is a trivalent chromium coating or a hexavalent chromium coating. Based on the micropores on the part surface and chrome plating technology, the low potential Nickel Layer is added to improve the corrosion resistance of the product, especially the corrosion resistance of trivalent chromium plating product, so as to promote the large scale popularization and application of the trivalent chromium product, which has better environmental protection performance.
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ultra corrosion resistant Nickel chromium plating component and manufacturing method thereof
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The invention relates to an ultra-corrosion-resistant Nickel-chromium plating component and a manufacturing method thereof, and belongs to the technical field of electroplating. The ultra-corrosion-resistant Nickel-chromium plating component includes a substrate, a pretreatment coating, a half matt gloss Nickel Layer, a full gloss Nickel Layer or a satin Nickel Layer, a functional Layer and a decorative Layer. The pretreatment coating is deposited on the entire substrate, and a copper plating Layer is formed on the pretreatment coating; the half matt gloss Nickel Layer is formed on the copper plating Layer; the full gloss Nickel Layer or satin Nickel Layer is formed on the half matt gloss Nickel Layer; the functional Layer is formed on the full gloss Nickel Layer or satin Nickel Layer, and the functional Layer includes a low potential Nickel Layer and a microporous Nickel Layer formed on the low potential Nickel Layer; and the decorative Layer is formed on the microporous Nickel Layer. The potential difference between the low potential Nickel Layer and the microporous Nickel Layer is 10-120 mv; the low potential Nickel Layer is a combination of one or two Layers of a high sulfur Nickel Layer and a micro crack Nickel Layer; when the micro crack and high sulfur Nickel composite coating is employed, the potential difference between the micro crack Nickel Layer and the high sulfur Nickel Layer is 10-80 mv. The invention also discloses the manufacturing method of the ultra-corrosion-resistant Nickel-chromium plating component. The method guarantees that the component not only has bright appearance of the micropore Nickel Layer, but also has superhigh corrosion resistance, hardness and wear resistance.
Debajyoti Bhaduri - One of the best experts on this subject based on the ideXlab platform.
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study on the role of pvd tin coating in improving the performance of electroplated monoLayer superabrasive wheel
Surface & Coatings Technology, 2010Co-Authors: Debajyoti Bhaduri, A K ChattopadhyayAbstract:Abstract The monoLayer grinding wheels, coated with a physical vapour deposited (PVD) coating (viz. TiN, HfN, TiN + ZrN etc.), have been reported to outperform their uncoated counterparts as claimed in some patented literatures. The present work aims at exploring the mechanism how PVD TiN augments the performance of Nickel electroplated monoLayer superabrasive wheels. This study also includes the effect of negative substrate bias voltage on performance of TiN coated electroplated cBN wheels during grinding of hardened bearing steel. TiN was deposited by pulsed DC closed-field unbalanced magnetron sputtering (CFUBMS) technique in an in-house PVD coating system. The structure of the TiN coating and post-grinding condition of the wheels were observed using scanning electron microscopy (SEM). Energy dispersive X-ray (EDX) line scan, Electron probe micro analysis (EPMA) and secondary ion mass spectrometry (SIMS) depth profiling at the junction of TiN and Nickel Layer indicated the occurrence of inter-diffusion between them and grazing incidence X-ray diffraction (GIXRD) confirmed the formation of Ni–Ti intermetallic phases at their interface. The scratch test revealed a significant increase in cohesive and adhesive strengths of Nickel Layer when TiN was deposited at a bias voltage of −60 V or beyond that. The uncoated cBN wheel exhibited large number of grit fracture at the bond level and some grit pull-out. Such failures of grit were significantly arrested with TiN coating deposited at the bias voltages of −60 V and −90 V.
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effect of pulsed dc cfubm sputtered tin coating on performance of Nickel electroplated monoLayer cbn wheel in grinding steel
Surface & Coatings Technology, 2010Co-Authors: Debajyoti Bhaduri, A K ChattopadhyayAbstract:Abstract The present research involves the deposition of pulsed DC CFUBM sputtered TiN on Nickel plated steel discs and electroplated monoLayer cBN wheels at seven different target frequencies and ten different bias voltages separately. The coating microstructures and the interaction between TiN and Nickel were studied using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and electron probe micro analysis (EPMA). Phase detection was carried out using grazing incidence X-ray diffraction (GIXRD) technique. The cohesive and adhesive strengths of Nickel Layer were assessed by scratch test. After grinding of low carbon steel (AISI 1020) and hardened bearing steel (AISI 52100), the conditions of the uncoated and coated cBN wheels were observed under Stereo Zoom Microscope and SEM. Average column size of TiN was found to decrease with increase in both target frequency and negative bias voltage. The structure of the coating gradually transformed from porous and open columnar (at 0 V bias) to very compact, dense and featureless (at − 80 V bias). EDX line scan and EPMA confirmed the cross-diffusion between TiN and Nickel and GIXRD indicated the formation of Nickel–titanium intermetallic phases at their interface. The cohesive strength of Nickel Layer was not effectively enhanced with increase in target frequency, whereas the same was significantly improved with increase in negative bias voltage. Seemingly, TiN coated wheel could not perform better than the uncoated wheel in grinding AISI 1020 steel due to high wheel loading. However, the uncoated wheel was found to undergo fracture wear, which was remarkably absent in the coated wheels. On the other hand, many fractured grits and some grit pull-out were observed in the uncoated wheel when grinding AISI 52100 steel, whereas almost no pull-out along with much less fractured grits were observed in the wheels coated at bias voltages like − 60 V and − 90 V.
Hao Jingjun - One of the best experts on this subject based on the ideXlab platform.
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multiply super anti corrosion Nickel plating chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model discloses a multiply super anti -corrosion Nickel plating - chromium part and manufacturing method, wherein multiply super anti -corrosion Nickel plating - chromium part includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, and the basal Layer, it is on the copper plate, and the functional Layer, it is on the basal Layer, and wherein the functional Layer includes electronegative potential Nickel dam and the microporous Nickel Layer on the electronegative potential Nickel dam, and the decorative Layer, it is on the microporous Nickel Layer, and the decorative Layer is the arbitrary of trivalent chromium cladding material or hexavalent chromium cladding material. The utility model discloses an on the surperficial micropore that provides of parts, chromium plating process basis, increase the electronegative potential Nickel coating to the corrosion resisting property of corrosion resisting property, the especially trivalent chromium product of product is improved, the more large -scale popularization and application of trivalent chromium product of more environmental protection can be makeeed.
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Nickel plating with or chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model discloses a Nickel plating with or chromium part, this part includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, the functional Layer, it is on the copper plate, and wherein the functional Layer includes electronegative potential Nickel dam and the microporous Nickel Layer on the electronegative potential Nickel dam, and the decorative Layer is on its formation and the microporous Nickel Layer. The utility model discloses a plate common microporous Nickel Layer and the electronegative potential Nickel dam that sets up in a top Layer to very big improvement holistic corrosion resistance of part and stability, can also have good bright planarization simultaneously, cladding material combines effectually.
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super anti corrosion Nickel plating chromium part
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The utility model relates to a super anti-corrosion Nickel plating -chromium part belongs to and electroplates technical field. It includes the substrate, preliminary treatment cladding material, its deposit are formed with the copper plate on preliminary treatment cladding material on whole substrate, with half light Nickel dam, it is on the copper plate, with full gloss Nickel dam or husky butyl's Nickel dam, it is formed at half light Nickel dam, and the functional Layer, it is on full gloss Nickel dam or husky butyl's Nickel dam, and wherein the functional Layer includes electronegative potential Nickel dam and the microporous Nickel Layer on the electronegative potential Nickel dam, and the decorative Layer, it is on the microporous Nickel Layer. Potential difference between electronegative potential Nickel dam and the microporous Nickel Layer is 10-120mv, the electronegative potential Nickel dam in high-sulfur Nickel dam, crazing line Nickel dam the one deck or two-Layer between the complex, when adopting the crazing line with high-sulfur Nickel composite plating, the potential difference is 10-80mv between crazing line and the high-sulfur Nickel. The outward appearance of both having guaranteed part microporous Nickel Layer is bright, makes it have super high corrosion resistance, hardness, wearability again.
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Nickel chromium plating part and manufacturing method thereof
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The invention discloses a Nickel-chromium plating part and a manufacturing method thereof. The Nickel-chromium plating part includes a substrate, a pretreatment coating, a base Layer, a functional Layer and a decorative Layer. The pretreatment coating is deposited on the entire substrate, and a copper plate Layer is formed on the pretreatment coating; the base Layer is formed on the copper plate Layer; the functional Layer is formed on the base Layer and includes a low potential Nickel Layer and a microporous Nickel Layer formed on the low potential Nickel Layer; and the decorative Layer is formed on the microporous Nickel Layer and is a trivalent chromium coating or a hexavalent chromium coating. Based on the micropores on the part surface and chrome plating technology, the low potential Nickel Layer is added to improve the corrosion resistance of the product, especially the corrosion resistance of trivalent chromium plating product, so as to promote the large scale popularization and application of the trivalent chromium product, which has better environmental protection performance.
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ultra corrosion resistant Nickel chromium plating component and manufacturing method thereof
2015Co-Authors: Hao Jingjun, Qian LimingAbstract:The invention relates to an ultra-corrosion-resistant Nickel-chromium plating component and a manufacturing method thereof, and belongs to the technical field of electroplating. The ultra-corrosion-resistant Nickel-chromium plating component includes a substrate, a pretreatment coating, a half matt gloss Nickel Layer, a full gloss Nickel Layer or a satin Nickel Layer, a functional Layer and a decorative Layer. The pretreatment coating is deposited on the entire substrate, and a copper plating Layer is formed on the pretreatment coating; the half matt gloss Nickel Layer is formed on the copper plating Layer; the full gloss Nickel Layer or satin Nickel Layer is formed on the half matt gloss Nickel Layer; the functional Layer is formed on the full gloss Nickel Layer or satin Nickel Layer, and the functional Layer includes a low potential Nickel Layer and a microporous Nickel Layer formed on the low potential Nickel Layer; and the decorative Layer is formed on the microporous Nickel Layer. The potential difference between the low potential Nickel Layer and the microporous Nickel Layer is 10-120 mv; the low potential Nickel Layer is a combination of one or two Layers of a high sulfur Nickel Layer and a micro crack Nickel Layer; when the micro crack and high sulfur Nickel composite coating is employed, the potential difference between the micro crack Nickel Layer and the high sulfur Nickel Layer is 10-80 mv. The invention also discloses the manufacturing method of the ultra-corrosion-resistant Nickel-chromium plating component. The method guarantees that the component not only has bright appearance of the micropore Nickel Layer, but also has superhigh corrosion resistance, hardness and wear resistance.
Jouni Ahopelto - One of the best experts on this subject based on the ideXlab platform.
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Nickel stamp fabrication using step stamp imprint lithography
Microelectronic Engineering, 2006Co-Authors: Tomi Haatainen, Paivi Majander, Tommi Riekkinen, Jouni AhopeltoAbstract:In this work we report of SSIL approach to fabricate a master for Nickel stamp. Using this method we produced large area metal stamps with wafer size up to 100mm with 100nm patterns. Electron beam patterned silicon stamps with size of a few square millimeters were used in patterning. The pattern of the stamp was transferred into a 100mm silicon wafer coated with mr-I 7030 thermoplastic using SSIL sequential imprinting. The TiW/Cu field metallization was then sputtered onto the wafer. A [email protected] Nickel Layer was electroplated using a commercial plating bath and pulsed current source. The Nickel stamp was detached from the substrate in a solvent.
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Nickel stamp fabrication using step & stamp imprint lithography
Microelectronic Engineering, 2006Co-Authors: Tomi Haatainen, Paivi Majander, Tommi Riekkinen, Jouni AhopeltoAbstract:In this work we report of SSIL approach to fabricate a master for Nickel stamp. Using this method we produced large area metal stamps with wafer size up to 100mm with 100nm patterns. Electron beam patterned silicon stamps with size of a few square millimeters were used in patterning. The pattern of the stamp was transferred into a 100mm silicon wafer coated with mr-I 7030 thermoplastic using SSIL sequential imprinting. The TiW/Cu field metallization was then sputtered onto the wafer. A [email protected] Nickel Layer was electroplated using a commercial plating bath and pulsed current source. The Nickel stamp was detached from the substrate in a solvent.
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Nickel stamp fabrication using step stamp imprint lithography
Microelectronic Engineering, 2006Co-Authors: Tomi Haatainen, Paivi Majander, Tommi Riekkinen, Jouni AhopeltoAbstract:In this work we report of SSIL approach to fabricate a master for Nickel stamp. Using this method we produced large area metal stamps with wafer size up to 100mm with 100nm patterns. Electron beam patterned silicon stamps with size of a few square millimeters were used in patterning. The pattern of the stamp was transferred into a 100mm silicon wafer coated with mr-I 7030 thermoplastic using SSIL sequential imprinting. The TiW/Cu field metallization was then sputtered onto the wafer. A [email protected] Nickel Layer was electroplated using a commercial plating bath and pulsed current source. The Nickel stamp was detached from the substrate in a solvent.