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Insight into structure evolution of carbon nitrides and its energy conversion as luminescence
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作者 Hao Zhang Jingwei Zhang +4 位作者 Wenjie Chen Minjia Tao Xianguang Meng Yuanjian Zhang Guifu Zuo 《Carbon Energy》 SCIE EI CAS CSCD 2024年第2期37-60,共24页
A series of carbon nitride(CN)materials represented by graphitic carbon nitride(g-C_(3)N_(4))have been widely used in bioimaging,biosensing,and other fields in recent years due to their nontoxicity,low cost,and high l... A series of carbon nitride(CN)materials represented by graphitic carbon nitride(g-C_(3)N_(4))have been widely used in bioimaging,biosensing,and other fields in recent years due to their nontoxicity,low cost,and high luminescent quantum efficiency.What is more attractive is that the luminescent properties such as wavelength and intensity can be regulated by controlling the structure at the molecular level.Hence,it is time to summarize the related research on CN structural evolution and make a prospect on future developments.In this review,we first summarize the research history and multiple structural evolution of CN.Then,the progress of improving the luminescence performance of CN through structural evolution was discussed.Significantly,the relationship between CN structure evolution and energy conversion in the forms of photoluminescence,chemiluminescence,and electrochemiluminescence was reviewed.Finally,key challenges and opportunities such as nanoscale dispersion strategy,luminous efficiency improving methods,standardization evaluation,and macroscopic preparation of CN are highlighted. 展开更多
关键词 carbon nitride CHEMILUMINESCENCE ELECTROCHEMILUMINESCENCE energy conversion PHOTOLUMINESCENCE structural evolution
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Development and Application of Multi-phase Nitrides Bonded Silicon Carbide Lintel Blocks for Dry Quenching Furnaces
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作者 CAO Huiyan FENG Yanbin +4 位作者 ZHANG Xinhua HUANG Zhigang LI Jie WANG Xinhui WU Jiguang 《China's Refractories》 CAS 2023年第2期7-11,共5页
Multi-phase nitrides bonded silicon carbide lintel blocks were prepared using industrial SiC(SiC≥98 mass%,3-0.5,≤0.5 and≤0.044 mm),Si powder(Si≥98 mass%,≤0.044 mm),and SiO2 micropowder(SiO2≥96 mass%,d50=0.15 pm)... Multi-phase nitrides bonded silicon carbide lintel blocks were prepared using industrial SiC(SiC≥98 mass%,3-0.5,≤0.5 and≤0.044 mm),Si powder(Si≥98 mass%,≤0.044 mm),and SiO2 micropowder(SiO2≥96 mass%,d50=0.15 pm)as raw materials,and calcium lignosulfonate as the additive,batching,mixing,and molding on a vibration pressure molding machine,drying and then firing at 1420℃for 10 h in high-purity N2.The apparent porosity,the bulk density,the cold modulus of rupture,the hot modulus of rupture,and the linear expansion coefficient of the samples were tested.The phase composition and the microstructure of the samples at different nitriding depths(50,100,and 150 mm)were analyzed by XRD and SEM.The field application effects of the blocks were studied.The results show that:(1)the multi-phase nitrides bonded silicon carbide refractories can dynamically adjust their own phase composition and minimize structural and thermal stresses,improving the service life of key parts of dry quenching furnaces;(2)calcium lignosulfonate can improve the nitriding micro-environment of multi-phase nitrides bonded silicon carbide lintel blocks,successfully increasing the effective nitriding thickness of the blocks to 300 mm;(3)Sinosteel LI RR provides a unique concept in the design of materials and block types as well as the stable and scientific overall structure,promoting the industrialization process of dry quenching furnaces with long service life in China. 展开更多
关键词 inclined channel area dry quenching furnaces silicon carbide multi-phase nitrides lintel blocks
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Ammonia Decomposition over Bimetallic Nitrides Supported on g-Al_2O_3 被引量:7
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作者 ChunShanLU XiaoNianLI YiFengZHU HuaZhangLIU ChunHuiZHOU 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第1期105-108,共4页
A series of monometallic nitrides and bimetallic nitrides were prepared by temperature-programmed reaction with NH3. The effects of Co, Ni and Fe additives and the synergic action between Fe, Co, Ni and Mo on the amm... A series of monometallic nitrides and bimetallic nitrides were prepared by temperature-programmed reaction with NH3. The effects of Co, Ni and Fe additives and the synergic action between Fe, Co, Ni and Mo on the ammonia decomposition activity were investigated. TPR-MS, XRD were also carried out to obtain better insight into the structure of the bimetallic nitride. The results of ammonia decomposition activity show that bimetallic nitrides are more active than monometallic nitrides or bimetallic oxides. 展开更多
关键词 nitrides transition metal g-Al2O3 ammonia decomposition.
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Supported Cobalt Molybdenum Bimetallic Nitrides for Ammonia Decomposition 被引量:6
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作者 项益智 李小年 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第5期696-700,共5页
Co and Mo bimetallic nitrides supported on Mg(Al)O, MgO and γ-Al2O3 were prepared in temperatureprogrammed reactions with NH3. The surface morphology, chemical composition and catalytic activity for NH3 decompositi... Co and Mo bimetallic nitrides supported on Mg(Al)O, MgO and γ-Al2O3 were prepared in temperatureprogrammed reactions with NH3. The surface morphology, chemical composition and catalytic activity for NH3 decomposition on the supported Co and Mo bimetallic nitrides were studied by X-ray diffractometer (XRD), NH3 temperature-programmed desorption and mass spectrometer (NH3-TPD-MS), temperature-programmed desorption and mass spectrometer (TPD-MS), H2 temperature-programmed surface reaction (H2-TPSR) and activity test. The phases of Co3Mo3N and MoN could be formed on Mg(Al)O, MgO and Al2O3 during the nitridation, and they might be more uniformly dispersed on Mg(Al)O and MgO than on γ-Al2O3. Transition metallic nitrides are generally considered as potential catalysts for hydrogen-involving reactions due to the entrance of hydrogen atoms into subsurface and the lattice of metallic nitrides. The diffusion of nitrogen in the bulk and the structure transformation of Co and Mo nitride compounds occur during NH3-TPD, but the supported Co and Mo bimetallic nitrides are not easily reduced at H2 atmosphere. Co3Mo3N/Mg(Al)O catalyst exhibits the highest activity, while Co3Mo3N/Al2O3 exhibits the lowest activity for NH3 decomposition. Furthermore, the catalytic activity of Co and Mo bimetallic nitrides is not only much higher than that of supported single metallic nitride, but also highly dependent upon the surface acidity and BET surface area of support. 展开更多
关键词 Co and Mo bimetallic nitrides surface morphology SUPPORT ammonia decomposition
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Recent advances in pseudocapacitor electrode materials: Transition metal oxides and nitrides 被引量:4
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作者 Chen-qi YI Jian-peng ZOU +1 位作者 Hong-zhi YANG Xian LENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第10期1980-2001,共22页
Faraday pseudocapacitors take both advantages of secondary battery with high energy density and supercapacitors with high power density,and electrode material is the key to determine the performance of Faraday pseudoc... Faraday pseudocapacitors take both advantages of secondary battery with high energy density and supercapacitors with high power density,and electrode material is the key to determine the performance of Faraday pseudocapacitors.Transition metal oxides and nitrides,as the two main kinds of pseudocapacitor electrode materials,can enhance energy density while maintaining high power capability.Recent advances in designing nanostructured architectures and preparing composites with high specific surface areas based on transition metal oxides and nitrides,including ruthenium oxides,nickel oxides,manganese oxides,vanadium oxides,cobalt oxides,iridium oxides,titanium nitrides,vanadium nitrides,molybdenum nitrides and niobium nitrides,are addressed,which would provide important significances for deep researches on pseudocapacitor electrode materials. 展开更多
关键词 PSEUDOCAPACITOR transition metal oxides transition metal nitrides energy density power density
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Preparation and properties of transition metal nitrides caged in N-doped hollow porous carbon sphere for oxygen reduction reaction 被引量:4
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作者 Yan-juan LI Min WANG +5 位作者 Sa LIU Jing-xia GAO Shun YANG Zi-hao LIU Xiao-yong LAI Xiao YAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第5期1427-1438,共12页
A series of transition metal nitrides(MxNy,M=Fe,Co,Ni)nanoparticle(NP)composites caged in N-doped hollow porous carbon sphere(NHPCS)were prepared by impregnation and heat treatment methods.These composites combine the... A series of transition metal nitrides(MxNy,M=Fe,Co,Ni)nanoparticle(NP)composites caged in N-doped hollow porous carbon sphere(NHPCS)were prepared by impregnation and heat treatment methods.These composites combine the high catalytic activity of nitrides and the high-efficiency mass transfer characteristics of NHPCS.The oxygen reduction reaction results indicate that Fe2N/NHPCS has the synergistic catalytic performance of higher onset potential(0.96 V),higher electron transfer number(~4)and higher limited current density(1.4 times as high as that of commercial Pt/C).In addition,this material is implemented as the air catalyst for zinc−air battery that exhibits considerable specific capacity(795.1 mA·h/g)comparable to that of Pt/C,higher durability and maximum power density(173.1 mW/cm2). 展开更多
关键词 N-doped porous carbon transition metal nitrides Zn−air battery oxygen reduction reaction fuel cell
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Effect of ZrO_2-nitrides Composite Powder Addition on Oxidation Resistance of Al_2O_3-C Refractories 被引量:2
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作者 ZHANG Mengmeng YU Renhong ZHOU Ningsheng 《China's Refractories》 CAS 2011年第3期22-25,共4页
Oxidation of carbon is the main problem or Al2O3 - C refractories. ZrO2 - nitrides composite powder was synthesized through carbothermal reduction and nitridation (CRN) of zircon. The effect of ZrO2 - nitrides compo... Oxidation of carbon is the main problem or Al2O3 - C refractories. ZrO2 - nitrides composite powder was synthesized through carbothermal reduction and nitridation (CRN) of zircon. The effect of ZrO2 - nitrides composite powder addition on oxidation resistance of the Al2O3 - C refractories was investigated by measuring the thickness of oxidation layer. Phase compositions of the Al2O3 - C refractories before and after oxidation were investigated by X-ray diffraction ( XRD ). Results show that the oxidation resistance of the Al2O3 - C refractories can be obviously improved by adding the synthesized ZrO2 - nitrides composite powder. The formation of mullite and zircon in the oxidation layer results in the densification of oxidation layer, which prevents oxygen diffusion and bnproves the oxidation resistance of the Al2O3 - C refractories. 展开更多
关键词 Zirconia- nitrides composite powder Aluminacarbon refractories Oxidation resistance
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Carbides/nitrides precipitates in a C-Mn strip by CSP technology 被引量:2
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作者 Ling Zhang Wangyue Yang +1 位作者 Weiwei Zheng Zuqing Sun 《Journal of University of Science and Technology Beijing》 CSCD 2005年第6期517-520,共4页
The carbides/nitrides precipitates in ferrite grains, on grain boundaries and dislocations were investigated on a hot-rolled C-Mn strip (0.16wt%C-1.22wt%Mn-0.022wt%Ti) produced by the CSP (compact strip production... The carbides/nitrides precipitates in ferrite grains, on grain boundaries and dislocations were investigated on a hot-rolled C-Mn strip (0.16wt%C-1.22wt%Mn-0.022wt%Ti) produced by the CSP (compact strip production) technology using TEM and X-ray energy dispersive spectroscopy. The Pickering's equation for the contribution of precipitates to the yield stress was also discussed. It is shown that there are numerous fine and dispersive precipitates TiC in the ferrite grains, on the grain boundaries and dislocations. Also there are a small amount of coarser Ti(C, N) particles and TiC particles associated with MnS. Precipitation strengthening on steels produced by the CSP technology is significant. 展开更多
关键词 CSP technology C-Mn steel carbides/nitrides precipitates
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Regulating non-precious transition metal nitrides bifunctional electrocatalysts through surface/interface nanoengineering for air-cathodes of Zn-air batteries 被引量:1
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作者 Qixing Du Yanmei Gong +4 位作者 Muhammad Arif Khan Daixin Ye Jianhui Fang Hongbin Zhao Jiujun Zhang 《Green Energy & Environment》 SCIE EI CSCD 2022年第1期16-34,共19页
Zn-air batteries(ZABs),especially the secondary batteries,have engrossed a great interest because of its high specific energy,economical and high safety.However,due to the insufficient activity and stability of bifunc... Zn-air batteries(ZABs),especially the secondary batteries,have engrossed a great interest because of its high specific energy,economical and high safety.However,due to the insufficient activity and stability of bifunctional electrocatalysts for air-cathode oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)processes,the practical application of rechargeable ZABs is seriously hindered.In the effort of developing high active,stable and cost-effective electrocatalysts,transition metal nitrides(TMNs)have been regarded as the candidates due to their high conductivity,strong corrosion-resistance,and bifunctional catalytic performance.In this paper,the research progress in TMNs-based material as ORR and OER electrocatalysts for ZABs is discussed with respect to their synthesis,chemical/physical characterization,and performance validation/optimization.The surface/interface nanoengineering strategies such as defect engineering,support binding,heteroatom introduction,crystal plane orientation,interface construction and small size effect,the physical and chemical properties of TMNs-based electrocatalysts are emphasized with respect to their structures/morphologies,composition,electrical conductivity,specific surface area,chemical stability and corrosion resistance.The challenges of TMNs-based materials as bifunctional air-cathode electrocatalysts in practical application are evaluated,and numerous research guidelines to solve these problems are put forward for facilitating further research and development. 展开更多
关键词 Surface/interface nanoengineering Non-precious transition metal nitrides Zn-air batteries Oxygen reduction reaction Oxygen evolution reaction
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Plasma-Chemical Synthesis of Nanosized Powders-Nitrides,Carbides,Oxides,Carbon Nanotubes and Fullerenes
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作者 Katerina ZAHARIEVA Gheorghi VISSOKOV +1 位作者 Janis GRABIS Slavcho RAKOVSKY 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第11期980-995,共16页
In this article the plasma-chemical synthesis of nanosized powders (nitrides, car- bides, oxides, carbon nanotubes and fullerenes) is reviewed. Nanosized powders - nitrides, carbides, oxides, carbon nanotubes and fu... In this article the plasma-chemical synthesis of nanosized powders (nitrides, car- bides, oxides, carbon nanotubes and fullerenes) is reviewed. Nanosized powders - nitrides, carbides, oxides, carbon nanotubes and fullerenes have been successfully produced using different techniques, technological apparatuses and conditions for their plasma-chemical synthesis. 展开更多
关键词 plasma nanosized powders nitrides carbides OXIDES carbon nanotubes fullerenes
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Epitaxy of Ⅲ-nitrides on two-dimensional materials and its applications
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作者 Yu Xu Jianfeng Wang +1 位作者 Bing Cao Ke Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第11期23-35,共13页
Ⅲ-nitride semiconductor materials have excellent optoelectronic properties,mechanical properties,and chemical stability,which have important applications in the field of optoelectronics and microelectronics.Two-dimen... Ⅲ-nitride semiconductor materials have excellent optoelectronic properties,mechanical properties,and chemical stability,which have important applications in the field of optoelectronics and microelectronics.Two-dimensional(2D)materials have been widely focused in recent years due to their peculiar properties.With the property of weak bonding between layers of 2D materials,the growth ofⅢ-nitrides on 2D materials has been proposed to solve the mismatch problem caused by heterogeneous epitaxy and to develop substrate stripping techniques to obtain high-quality,low-cost nitride materials for high-quality nitride devices and their extension in the field of flexible devices.In this progress report,the main methods for the preparation of 2D materials,and the recent progress and applications of different techniques for the growth ofⅢ-nitrides based on 2D materials are reviewed. 展开更多
关键词 nitrides two-dimensional materials van der Waals forces
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First-principles studies of the vibrational properties of amorphous carbon nitrides
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作者 牛丽 王选章 +1 位作者 朱嘉琦 高巍 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期467-471,共5页
Raman spectra of amorphous carbon nitride films (a-C:N) resemble those of typical amorphous carbon (a-C), and no specific features in the spectra are shown due to N doping. The present work provides a correlation... Raman spectra of amorphous carbon nitride films (a-C:N) resemble those of typical amorphous carbon (a-C), and no specific features in the spectra are shown due to N doping. The present work provides a correlation between the microstructure and vibrational properties of a-C:N films from first principles. The six periodic model structures of 64 atoms with various mass densities and nitrogen contents are generated by the liquid-quench method using Car-Parinello molecular dynamics. By using Raman coupling tensors calculated with the finite electric field method, Raman spectra are obtained. The calculated results show that the vibrations of C=N could directly contribute to the Raman spectrum. The similarity of the Raman line shapes of N-doped and N-free amorphous carbons is due to the overlapping of C=N and C=C vibration bands. In addition, the origin of characteristic Raman peaks is also given. 展开更多
关键词 amorphous carbon nitrides density functional theory vibrational Raman spectra
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Close Coupled Showerhead Reactors for the Growth of Group Ⅲ Nitrides
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作者 Thrush E J Kappers M +5 位作者 Considine L Mullins J T Saywell V Bentham F C Sharma N Humphreys C J 《发光学报》 EI CAS CSCD 北大核心 2001年第z1期103-106,共4页
The group Ⅲ nitrides are an important class of materials with aplications in UV and visible optoelectronics,high temperature electronics,cold cathodes and solar blind detectors.In recent years,with the realisation of... The group Ⅲ nitrides are an important class of materials with aplications in UV and visible optoelectronics,high temperature electronics,cold cathodes and solar blind detectors.In recent years,with the realisation of nitride based LEDs,the use of GaN IED has the potential to compete with 1raditional filament and discharge lamps,for the provision of white lighting,and there has been an explosion of interest in the MOCVD growth of GaN based materials with an increasing focus on large area multiwafer reactors and wafer uniforrmity.This paper will review the design philosophy and characteristics of close-coupled showerhead reactors,relating these to the requirements of group Ⅲ-nitride growth,and will present a selection of data resulting from the operation of such equipment.These results suggest that the close coupled showerhead style of reactor is very suitable for the growth of GaN based structures in both research and production environments. 展开更多
关键词 MOCVD close coupled showerhead reactor growth of groupⅢnitrides
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High-Temperature Thermodynamic Investigation of Nano-Dispersed Nitrides Obtained in Thermal Plasma
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作者 M. GEORGIEVA G. VISSOKOV Iv. GRANCHAROV L. BRAKALOV 《Plasma Science and Technology》 SCIE EI CAS CSCD 2007年第2期174-176,共3页
The nitrides of transient metals have a high hardness, thermal stability, remarkable wear resistance in aggressive chemical mediums, melted metals and alloys, high corrosion resistance, and low coefficient of electric... The nitrides of transient metals have a high hardness, thermal stability, remarkable wear resistance in aggressive chemical mediums, melted metals and alloys, high corrosion resistance, and low coefficient of electric resistance. Under the conditions of low-temperature argon plasma (LTP), thermodynamic investigations were conducted in the process of obtaining of A1N, TiN and Si3N4 in a temperature range of 1000 K to 6000 K. To investigate the thermodynamic possibility of obtaining nitrides, a computer model was used which provided the equilibrium composition of gaseous and solid phases at different temperatures. The conditions for chemical equilibrium of the system were based on the minimization of Gibbs' energy. 展开更多
关键词 plasma-chemical treatment nitrides thermodynamic analysis
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Synthesis and Characterization of Vanadium Molybdenum Oxynitrides Nanoparticles in the Channels of MCM-41
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作者 张存满 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第4期29-31,42,共4页
Vanadium molybdenum oxynitrides nanoparticles were synthesized successfully in the channels of MCM-41 after surface modification,vacumm co-impregnation and nitridation technology.The products were investigated by nitr... Vanadium molybdenum oxynitrides nanoparticles were synthesized successfully in the channels of MCM-41 after surface modification,vacumm co-impregnation and nitridation technology.The products were investigated by nitrogen sorption measurement,X-ray powder diffraction(XRD),high-resolution transmission electron microscopy(HRTEM),energy dispersive analysis of X-rays(EDAX)and CNH element analysis.The investigation resnlts show that superfine nanoparticles of vanadium molybderum oxynitrides exist in the channels of MCM-41. 展开更多
关键词 NANOPARTICLES vanadium molybdenum oxynitrides MCM-41 NITRIDATION
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New Type of Nitrides with High Electrical and Thermal Conductivities
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作者 Ning Liu Xiaolong Chen +2 位作者 Jiangang GUO Jun Deng Liwei Guo 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第8期70-73,共4页
The nitrogen dimer as both a fundamental building unit in designing a new type of nitrides, and a material gene associated with high electrical and thermal conductivities is investigated by first principles calculatio... The nitrogen dimer as both a fundamental building unit in designing a new type of nitrides, and a material gene associated with high electrical and thermal conductivities is investigated by first principles calculations.The results indicate that the predicted Si N4 is structurally stable and reasonably energy-favored with a striking feature in its band structure that exhibits free electron-like energy dispersions. It possesses a high electrical conductivity(5.07 × 10^5 S/cm) and a high thermal conductivity(371 W/m·K) comparable to copper. The validity is tested by isostructural Al N4 and Si C4. It is demonstrated that the nitrogen dimers can supply a high density of delocalized electrons in this new type of nitrides. 展开更多
关键词 Si New Type of nitrides with High Electrical and Thermal Conductivities
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Investigations of high-pressure and high-temperature behaviors of the newly-discovered willemite-Ⅱ and post-phenacite silicon nitrides
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作者 陈东 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第12期370-375,共6页
Using the first-principles method of the plane-wave pseudo-potential, the structural properties of the newly-discovered willemite-Ⅱ Si3N4 (wⅡ phase) and post-phenacite Si3N4 (δ phase) are investigated. The α p... Using the first-principles method of the plane-wave pseudo-potential, the structural properties of the newly-discovered willemite-Ⅱ Si3N4 (wⅡ phase) and post-phenacite Si3N4 (δ phase) are investigated. The α phase is predicted to undergo a first-order α→wⅡ phase transition at 18.6 GPa and 300 K. Within the quasi-harmonic approximation (QHA), the α→wⅡ phase boundary is also obtained. When the well-known β→γ transition is suppressed by some kinetic reasons, the β→δ phase transformation could be observed in the phase diagram. Besides, the temperature dependences of the cell volume,thermal expansion coefficient, bulk modulus, specific heat, entropy and Debye temperature of the involved phases are determined from the non-equilibrium free energies. The thermal expansion coefficients of wⅡ-Si3N4 show no negative values in a pressure range of 0-30 GPa, which implies that the wⅡ-Si3N4 is mechanically stable. More importantly, the δ-Si3N4 is found to be a negative thermal expansion material. Further experimental investigations may be required to determine the physical properties of wⅡ- and δ-Si3N4 with higher reliability. 展开更多
关键词 first-principles nitrides phase boundary thermal property
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Electrochemical extraction and the analysis of inter-metallic phases and nitrides in tempered duplex stainless steels 被引量:2
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作者 MIAO Lede ZHANG Yi WANG Zhiyu WU Junfei 《Baosteel Technical Research》 CAS 2009年第2期52-57,共6页
During aging at a temperature ranging from 650 -950 ℃,the ferric matrix in duplex stainless steels undergoes various decomposition processes which could form the precipitates of the Sigma (σ) and Chi (X) phases,... During aging at a temperature ranging from 650 -950 ℃,the ferric matrix in duplex stainless steels undergoes various decomposition processes which could form the precipitates of the Sigma (σ) and Chi (X) phases, as well as nitrides. It is well known that these precipitates lead to a reduction in creep ductility and adversely affect toughness and corrosion properties of steel. This experiment carded out qualitative and quantitative analyses of intermetallic phases and nitrides and established an analytical procedure, including specimen preparation, the choosing of the electrolyte and electrolytic systems,electrolytic isolation,wet chemical separation, and physical and chemical analysis, etc. The residues were collected by ultrasonic cleaning and filtration after galvanostatic electrolysis. Dynamic laser scattering sizer (DLS- sizer) ,scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to examine their structure,modality and size. Qualitative and quantitative analyses were performed by using X-ray diffraction (XRD), oxygen-nitrogen analyzer and wet chemical analysis. Furthermore, there is a discussion on the effect of isothermal treatment on precipitation that occurs at different temperatures for different periods of time. 展开更多
关键词 duplex stainless steel PRECIPITATION intermetallic phase NITRIDE ELECTROLYSIS
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The Role of Nanodispersed Nitrides in the Sintering of Silicon Nitride Ceramics 被引量:1
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作者 M.GEORGIEVA G.VISSOKOV +2 位作者 I.GRANCHAROV R.F.SILVA F.J.OLIVEIRA 《Plasma Science and Technology》 SCIE EI CAS CSCD 2010年第1期46-48,共3页
The synthesis of ceramics based on silicon nitride using nanopowders of TiN and Si3N4 as additives was studied. The ceramic compositions were pressurelessly sintered under ni- trogen atmosphere at different temperatur... The synthesis of ceramics based on silicon nitride using nanopowders of TiN and Si3N4 as additives was studied. The ceramic compositions were pressurelessly sintered under ni- trogen atmosphere at different temperatures (1550℃, 1650℃ and 1750℃) with a heating rate of 10℃/min and a holding time of 2 h. The nanodispersed nitrides (NDN) were produced by electric-arc plasma synthesis and characterized. The ceramic composites obtained with nanoparticles of 1wt% to 5wt% TiN and 20wt% Si3N4 were characterized by scanning electron microscopy (SEM), atom force microscopy (AFM) and energy-dispersive spectrometry (EDX). The effect of the addition of nanodispersed powders on the mechanical properties and microstructure of Si3N4 ceramics was investigated. 展开更多
关键词 silicon nitride ceramics NANOCOMPOSITES NANOPOWDERS
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Characterization and Tribological Performance of Titanium Nitrides in Situ Grown on Ti6Al4V Alloy by Glow Discharge Plasma Nitriding 被引量:1
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作者 KONG Weicheng YU Zhou HU Jun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第1期76-84,共9页
Titanium(Ti)nitrides were in situ grown on Ti6Al4V alloy(TA)using a glow discharge plasma nitriding(GDPN).The morphology,chemical composition,phase and mechanical property of the obtained nitrided TA were analyzed usi... Titanium(Ti)nitrides were in situ grown on Ti6Al4V alloy(TA)using a glow discharge plasma nitriding(GDPN).The morphology,chemical composition,phase and mechanical property of the obtained nitrided TA were analyzed using a scanning electron microscope(SEM),energy dispersive spectroscope(EDS),X-ray diffraction(XRD),and nanoindentation tester,respectively.The tribological performances of un-nitrided and nitrided TAs were evaluated using a ball-on-plate wear tester,and the wear mechanism was also discussed in detail.The results show that the nitrided layer with the compound and diffusion layers is formed on the nitrided TA,which is composed of δ-TiN and a-Ti phases.The nanohardness and elastic modulus of nitrided TA are 6.05 and 143.13 GPa,respectively,higher than those of un-nitrided TA.The friction reduction and anti-wear performances of nitrided TA are better than those of un-nitrided TA,and the wear mechanism is primary abrasive wear,accompanying with adhesive wear,which is attributed to the formation of Ti nitrides with the high nanohardness and elastic modulus. 展开更多
关键词 glow discharge plasma nitriding(GDPN) Ti6Al4V alloy(TA) coefficient of friction(COF) wear mechanism
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