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Effect of Sputtered TiAlCr Coatings on Oxidation and Hot Corrosion Resistance of Ti-24Al-14Nb-3V 被引量:2
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作者 Fuhui WANG, Chunhong GUAN, Zhaolin TANG and Weitao WU State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第5期501-506,共6页
The effect of sputtered Ti-50Al-10Cr and Ti-50A1-20Cr coatings on both isothermal and cyclic oxidation resistance at 800-900℃ and hot corrosion resistance at 850℃ of Ti-24Al-14Nb-3V was investigated. Results indicat... The effect of sputtered Ti-50Al-10Cr and Ti-50A1-20Cr coatings on both isothermal and cyclic oxidation resistance at 800-900℃ and hot corrosion resistance at 850℃ of Ti-24Al-14Nb-3V was investigated. Results indicated that Ti-24Al-14Nb-3V alloys exhibited poor oxidation resistance due to the formation of Al2O3+TiO2+AlNbO4 mixed scales in air at 800-900℃ and poor hot corrosion resistance due to the spoliation of scales formed in Na2SO4+K2SO4 melts at 850℃. Both Ti-50Al-10Cr and Ti-50Al-20Cr coatings remarkably improved the oxidation and hot corrosion resistance of Ti-24Al-14Nb-3V alloy. 展开更多
关键词 Ti Cr effect of Sputtered TiAlCr coatings on Oxidation and Hot Corrosion Resistance of Ti-24Al-14Nb-3V Al
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Comparing the Effectiveness of Coatings on Carbide andCermet Cutting Tool Inserts
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作者 K.H. W.Seah M.Rahman and C.H.Lee (Dept. of Mech. & Prod. Eng., National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511 T.N.Goh (Dept. of Ind. & Sys. Eng., National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第4期269-275,共7页
A series of metal cutting experiments was performed on a CNC lathe to evaluate the performance of various coatings on different tool substrates. The workpiece material was plain medium carbon steel and the cutting too... A series of metal cutting experiments was performed on a CNC lathe to evaluate the performance of various coatings on different tool substrates. The workpiece material was plain medium carbon steel and the cutting tool materials were carbide and cermet inserts coated with various single as well as multilayer coatings. Machining was done under various cutting conditions of speed and feed-rate, and for various durations of Cutting. The output parameters studied were the cutting forces (axial, radial and tangential), the surface roughness of the workpiece, as well as the tool wear (crater and flank wear). From these results, the performances of the various cutting inserts are evaluated and compared. Results show that cutting forces are significantly lower when using coated cermets than when using coated carbides although different coatings on the same substrate also result in different cutting forces. However, there is less difference in the surface roughness of the finished workpiece for the various coatings and substrates. 展开更多
关键词 TOOL Comparing the effectiveness of coatings on Carbide andCermet Cutting Tool Inserts
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The Effect and Mechanism of Nano-Cu Lubricating Additives on the Electroless Deposited Ni-W-P Coating
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作者 陈敏 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第5期815-820,共6页
The coating and deposition process with excellent anti wear and suitable for industrial application were developed, and the optimum bath composition and process were obtained by studying the influence of the bath comp... The coating and deposition process with excellent anti wear and suitable for industrial application were developed, and the optimum bath composition and process were obtained by studying the influence of the bath composition, temperature and pH value on the deposition rate and the plating solution stability. Moreover, the tribological properties of nano-Cu lubricating additives and electroless deposited Ni-W-P coating as well as their synergistic effect are researched using ring-block abrasion testing machine and energy dispersive spectrometer. Research results show that Ni-W-P alloy coating and nano-Cu lubricating additive have excellent synergistic effect, e g, the wear resistance of Ni-W-P alloy coating (with heat treatment and the oil with nano-Cu additives) has increased hundreds times than 45 steel as the metal substrate with the basic oil, and zero wear is achieved, which breaks through the bottleneck of previous separate research of the above-mentioned two aspects. 展开更多
关键词 Ni-W-P alloy coating nano Cu lubricating additives friction-Wear mechanism synergistic effect
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The Study of the Grit-blasting Parameters and Their Effects on the Adhesive Strength of the Plasma Sprayed Coatings
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作者 M Heydarzadeh Sohi M Frooghieh Sh Khameneh Asl 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期108-109,共2页
Surface Preparation is very important in adhesive b on ding of spray coatings to the surface of a work piece. The common practice is gr it-blasting of the surface before subjecting it to the spray coating process. In ... Surface Preparation is very important in adhesive b on ding of spray coatings to the surface of a work piece. The common practice is gr it-blasting of the surface before subjecting it to the spray coating process. In this study, grit-blasting of an AISI 4130 steel (of different heat treatmen ts) with Al 2O 3 particles was studied. Various grit-blasting parameters such as blasting particle size, the distance between blasting nozzle and the work pi ece (25, 30 and 40 cm.), blasting pressure (3,4,5,6 and 7 bars), blasting time ( 3, 6 and 10 seconds), and the blasting angle (45° and 90°) were examined in or der to find the optimum roughness. The mean roughness (Ra) of the grit-blasted surfaces were measured and the vari ations of the roughness with respect to the above mentioned variables were studi ed. The results show that by increasing blasting time, surface roughness increas es up to a maximum and then slightly decreases it with further duration of t he process. On the other hand a lengthy blasting causes some undesirable results such as an increase in residual particles between surface irregularities. There fore an optimum blasting time is of great importance. Increasing the blasting pr essure also provides a rougher surface, but in grit blasting of harder specimens the surface roughness decreases when the pressure reaches a certain limit. About the blasting angle, it was noticed that an angle of 45° results in less r esidual particles between the surface irregularities, in comparison to the angle of 90°. After grit-blasting, the specimens were plasma spray coated with 80% ZrO 2-20 % Y 2O 3 powder. The adhesive strength of the coating to the substrate was the n measured according to the DIN 50160 standard. The results show that for a certain base metal, the adhesive strength is directl y related to the surface roughness of the base material. Residual particles afte r grit-blasting the surface of the specimens can also have a strong deteriorati ng effect on adhesive strength. Finally, it was shown that the hardness of the b ase material had a direct effect on the adhesive strength of the sprayed coating s. 展开更多
关键词 The Study of the Grit-blasting Parameters and Their effects on the Adhesive Strength of the Plasma Sprayed coatings
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Effect of Seed Coat on Drying Kinetics of Kidney Bean Seed
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作者 杨俊红 郭锦棠 +3 位作者 段增宾 刘冰 褚治德 吴树民 《Transactions of Tianjin University》 EI CAS 2002年第4期273-276,共4页
Kidney bean seed was dried in a laboratory scale fixed bed. The effect of seed coat on drying dynamic characteristics and the changes of seed coat structure were investigated. A mathematical model was established to s... Kidney bean seed was dried in a laboratory scale fixed bed. The effect of seed coat on drying dynamic characteristics and the changes of seed coat structure were investigated. A mathematical model was established to simulate the drying process and determine the moisture diffusivity. Numerical results agree well with the experimental data. The average moisture diffusivity of the seed with separated coat is 1.67 times larger than that of the seed with coat, and the moisture diffusivity of seed cotyledon is 3.2 times larger than that of the seed coat. It is proved that the seed coat is the most main resistance of mass transfer and is also one of the key points of the optimization of heat and mass transfer for seed drying. 展开更多
关键词 seed drying seed coat effect internal moisture diffusion model moisture diffusivity
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Uncontrolled hypertension in older patients: markers and associated factors to masked and white-coat effect
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作者 Nereida KC Lima Julio C Moriguti Eduardo Feniolli 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2016年第8期672-678,共7页
Background Hypertension is the main risk factor for cardiovascular diseases, affecting more than half the elderly population. It is essential to know if they have proper control of hypertension. The aim of this study ... Background Hypertension is the main risk factor for cardiovascular diseases, affecting more than half the elderly population. It is essential to know if they have proper control of hypertension. The aim of this study was to identify the associated factors to masked uncon- trolled hypertension and false uncontrolled hypertension in older patients. Methods Two-hundred seventy-three individuals (70.1±6.7 years-old) had blood pressure (BP) measured at the office and by ambulatory BP monitoring (ABPM), with the definition of controlled group (C), individuals with high office BP and adequate ABPM, called white-coat effect group (WCE), uncontrolled (UC), and subjects with ap- propriate office BP and elevated ABPM denominated masked effect group (ME). Age, body mass index, diabetes, pulse pressure (PP) and BP dipping during sleep were evaluated (Kruskal-Wallis test and logistic regression models). Results Age was higher in UC than in C and ME (P 〈 0.01), and 24-h ABPM PP was lower in C (48± 7 mmHg) and WCE (51±6 mmHg) than in UC (67±12 mmHg) and ME (59±8 mmHg) (P 〈 0.01). Sleep systolic BP dipping was lower in ME than in C (P = 0.03). Female gender was associated with a greater chance of being of ME group, which showed a higher PP and lower BP dipping during sleep. Conclusions In older individuals, office BP measure- ments did not allow the detection of associated factors that would permit to differentiate WCE from UC group and C from ME group. ABPM favored the identification of a higher PP and a lower BP dipping during sleep in the masked effect and uncontrolled groups. 展开更多
关键词 Ambulatory blood pressure monitoring HYPERTENSION Masked effect The aged White coat effect
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Effects of over night-storing of buffy coat on platelet concentrates:in vitro studies
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《中国输血杂志》 CAS CSCD 2001年第S1期396-,共1页
关键词 OVER effects of over night-storing of buffy coat on platelet concentrates
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Image-based appearance acquisition of effect coatings
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作者 Jirí Filip Radomír Vávra 《Computational Visual Media》 CSCD 2019年第1期73-89,共17页
Paint manufacturers strive to introduce unique visual effects to coatings in order to visually communicate functional properties of products using value-added, customized design. However, these effects often feature c... Paint manufacturers strive to introduce unique visual effects to coatings in order to visually communicate functional properties of products using value-added, customized design. However, these effects often feature complex, angularly dependent, spatiallyvarying behavior, thus representing a challenge in digital reproduction. In this paper we analyze several approaches to capturing spatially-varying appearances of effect coatings. We compare a baseline approach based on a bidirectional texture function(BTF) with four variants of half-difference parameterization. Through a psychophysical study, we determine minimal sampling along individual dimensions of this parameterization.We conclude that, compared to BTF, bivariate representations better preserve visual fidelity of effect coatings, better characterizing near-specular behavior and significantly the restricting number of images which must be captured. 展开更多
关键词 effect coatings MEASUREMENT bidirectional texture function(BTF) APPEARANCE psychophysical experiment
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Fabrication of a superamphiphobic coating by a simple and flexible method 被引量:1
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作者 Pengfei Jiang Yanli Li +2 位作者 Chuan Zhang Xuan Zhou YongJiang 《Particuology》 SCIE EI CAS CSCD 2018年第4期33-39,共7页
A facile and flexible method to prepare raspberry-like nanoparticles that can be used as a superamphipho- bic coating is reported. Anatase TiO2 nanoparticles were chosen as the core because of their irregular morpholo... A facile and flexible method to prepare raspberry-like nanoparticles that can be used as a superamphipho- bic coating is reported. Anatase TiO2 nanoparticles were chosen as the core because of their irregular morphology and photocatalytic performance. Anatase TiO2 nanoparticles were surrounded tightly by tiny functional fluoride-silica nanoparticles via the hydrolysis-condensation reaction of tetraethoxysi- lane and IH, 1H, 2H, 2H-perfluorodecyl triethoxysilane. The obtained Si-F@TiO2 nanoparticles can be sprayed or dipped directly onto various substrates. The coated film exhibited quite good liquid resistance, even when subjected to water jetting and sand abrasion. The photocatalytic effect of the coated anatase TiO2 with respect to formaldehyde was also studied and discussed. This method will provide more opportunities and fast access to practical applications in surface, environmental, and energy engineering. 展开更多
关键词 Superamphiphobic coating TiO2 nanoparticle Fluoride-silica nanoparticle Photocatalytic effect Formaldehyde
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N-doped CNTs capped with carbon layer armored CoFe alloy as highly stable bifunctional catalyst for oxygen electrocatalysis 被引量:1
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作者 Bin Wang Katam Srinivas +4 位作者 Yanfang Liu Dawei Liu Xiaojuan Zhang Wanli Zhang Yuanfu Chen 《Nano Research》 SCIE EI CSCD 2022年第5期3971-3979,共9页
Designing and fabricating the bifunctional electrocatalysts for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)has long posed an uphill and pressing task for the interconversion of electricity and... Designing and fabricating the bifunctional electrocatalysts for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)has long posed an uphill and pressing task for the interconversion of electricity and chemicals.Baring this in mind,herein,we propose a novel hierarchical nanoarchitecture of N-doped carbon nanotubes capped with carbon layer armored CoFe alloy(CoFe@NC-NT),which is facilely fabricated by spray drying and subsequent annealing process.As a bifunctional electrocatalyst,the well-designed CoFe@NC-NT shows a remarkably low overpotential of 257 mV and a half-wave potential of 0.74 V to obtain 10 mA·cm^(-2)in OER and ORR,respectively.Meanwhile,it is also characterized by exceptional operating stability to meet practical application for Zn-air batteries.The high catalytic activity of CoFe@NC-NT is attributed to the tight contact between the highly conductive nanotubes and metal alloy nanoparticles.And the qualified stability is ascribed to the coating effect of carbon layer shell to alloy core.Given the unique structural evolution with enhanced oxygen-involved reaction activity,we believe that this work can provide an appealing innovative approach towards the directed self-assembly of functional nanostructures to realize satisfying overall performance. 展开更多
关键词 oxygen electrocatalysis metal alloy coating effect SELF-ASSEMBLY Zn-air battery
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