Influence of Micro Sandblasting on the Surface Integrity of the AlTiN Coated Tool Material

2021 ◽  
Author(s):  
Zhou Yu ◽  
Yujuan Dong ◽  
Guangming Zheng ◽  
Xiuli Jiang ◽  
Xiang Cheng ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Surface Integrity ◽  
High Efficiency ◽  
Low Cost ◽  
Tool Material ◽  
Maximum Velocity ◽  
Target Surface ◽  
Practical Significance ◽  
Coated Tools ◽  
Coated Tool

Abstract Due to the high-efficiency, environmental protection the low cost, the micro sandblasting technology is used in the surface treatment of the coated tools. The simulation and application of micro sandblasting of the coated tool are carried out to reveal the surface treatment mechanism and analyze the influence of sandblasting parameters on the tool surface integrity. The flow field erosion simulation model of abrasive-water-air three-phase flow is established. The results show that the maximum velocity and pressure are obtained at the center of jet flow. The pressure distribution on the target surface has little correlation with the distance to the nozzle. The surface morphology of the AlTiN coated tool changes obviously after micro sandblasting. Moreover, the low surface roughness Ra of the blasted tool can be obtained at the small sandblasting pressure and time. Additionally, the residual compressive stress on the surface of the AlTiN coated tool is enhanced after micro sandblasting. This work has practical significance for optimizing micro sandblasting process and improving the surface integrity of coated tools.

Study on Parameters Optimization of Ceramic Machining Process

2011 ◽  
Vol 418-420 ◽  
pp. 1338-1341
Author(s):  
Qiang Wang ◽  
Ying Ying Zeng ◽  
Xu Guang Min
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Cutting Speed ◽  
Tool Material ◽  
Parameters Optimization ◽  
Machining Process ◽  
Impact Factors ◽  
Surface Model ◽  
Optimal Parameters ◽  
Ceramic Machining

The response surface model is established through application of surface response method, then the main impact factors of ceramic machining are determined, and the process parameters are optimized. The mechanical machining technology of ceramic materials is analyzed, and the corresponding optimal parameters are proposed by cutting tool material, rake angle, clearance angle and edge angle, and three cutting elements as cutting speed, cutting depth and feed. Accord to the optimal parameters, high efficiency, good quality and low cost results can be achieved to machine ceramic parts.

The Effects of Cutting Conditions on Surface Integrity in Machining Waspaloy

2014 ◽  
Vol 611-612 ◽  
pp. 1243-1249
Author(s):  
Domenico Umbrello
Keyword(s):  
Tool Wear ◽  
Surface Integrity ◽  
Cutting Speed ◽  
Production Costs ◽  
Cutting Conditions ◽  
Dry Cutting ◽  
Important Indicator ◽  
Coated Tools ◽  
Coated Tool ◽  
Environmentally Safe

Machining of advanced aerospace materials have grown in the recent years although the difficult-to-machine characteristics of alloys like titanium or nickel based alloys cause higher cutting forces, rapid tool wear, and more heat generation. Therefore, machining with the use of cooling lubricants is usually carried out. To reduce the production costs and to make the processes environmentally safe, the goal is to move toward dry cutting by eliminating cutting fluids. This objective can be achieved by using coated tool, by increasing cutting speed and by improving the product performance in term of surface integrity and product quality. The paper addresses the effects of cutting speed and feed on the surface integrity during dry machining of Waspaloy using coated tools. In particular, the influence of the cutting conditions on mechanical power consumption, the tool wear and some important indicator of the surface integrity (surface roughness, affected layer, microhardness, grain size and microstructural alteration) were investigated. Results show that cutting conditions have a significant effect on the parameters related to the surface integrity of the product affecting its overall performance.

A New Wet-Type Dust Removal and Desulfuration Equipment and its Application in the Ceramic Industries

2012 ◽  
Vol 450-451 ◽  
pp. 1629-1632 ◽  
Author(s):  
Zhi Cheng Huang
Keyword(s):  
Spray Drying ◽  
Ceramic Industry ◽  
High Efficiency ◽  
Low Cost ◽  
Dust Removal ◽  
Practical Significance ◽  
Clean System ◽  
Long Time

A new wet-type dust removal and desulfuration equipment can be used in ceramic industry for spray drying tower. It adopts four ways and seven grades remove dust. A pair of tubes are erected inside and outside its structure; it has self- clean system, and it can keep the ability of dust removal for a long time. Practice has proved that this equipment has the advantages of low cost, easy maintenance, high efficiency and can be secondary desulfurization, it has great practical significance.

scholarly journals Hepatoprotective activity of 1,2,4-triazole-3-thione derivatives, which contains on c5-atomic carbon hydroxy(phenyl)methyl dependent

2018 ◽  
pp. 55-63
Author(s):  
A. M. Rud ◽  
A. G. Kaplaushenko ◽  
E. S. Pruglo ◽  
Yu. S. Frolova
Keyword(s):  
Carbon Tetrachloride ◽  
Chemical Structure ◽  
High Efficiency ◽  
Low Cost ◽  
Hepatoprotective Activity ◽  
Practical Significance ◽  
Experimental Animals ◽  
Triazole Derivatives ◽  
Hepatoprotective Effects ◽  
Derivatives Of

Relevance of pharmaceuticals with high efficiency and low cost for the prevention and treatment of diseases of the digestive system is unquestionable. It would be appropriate to mention that we carried out an analysis of a number of studies in which hepatoprotective effects of 1,2,4-triazole derivatives were carried out, and showed high hepatoprotective effects. Therefore, the search for hepatoprotectors in the series of 1,2,4-triazole derivatives has not only theoretical but also practical significance. The aim of our work was to study the first synthesized derivatives of 1,2,4-triazole-3-thione, which was containing substituents on C5 by carbon atom in conditions of tetrachormethane hepatitis. To model toxic hepatitis, a hepatotoxic xenobiotic, carbon tetrachloride, was used. The study of biochemical indicators of liver status was carried out 24 hours after the last injection of carbon tetrachloride. The ability of the test compounds to restore the integrity of hepatocyte membranes was determined by the anti-cytolytic effect (decrease in the activity of Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST)). According to the results of the study, it was found that among 43 test compounds, 5 are able to prevent survival at 85.71%. Thus, among the substances studied, compound 2c, which contributed 85.71% of the survival of the experimental animals and decrease 33.43% in ALT and 34.33% in AST. In this case, a very weak inverse dependence of the above indices was observed (r = -0.31). Some regularities of the chemical structure of the hepatoprotective action of 1,2,4-triazole derivatives have been established, so the survival of the experimental animals decreased with the introduction of a phenyl substituent of the starting thiones with N4.

Study on the Optimization of Deposition Processing Technology of Diamond Coated Tools

2009 ◽  
Vol 69-70 ◽  
pp. 16-19
Author(s):  
Yu Ping Ma ◽  
Ming Chen ◽  
Fang Hong Sun
Keyword(s):  
Diamond Films ◽  
Cutting Performance ◽  
Practical Significance ◽  
X Ray Diffraction ◽  
Coated Tools ◽  
Coated Tool ◽  
Base Composite ◽  
Cemented Carbide Tools ◽  
Aluminum Base ◽  
Work Done

Diamond films was deposited on cemented carbide tools with two-step pretreatment method under different distances between the substrates and hot filaments, and the effect of the distance between the substrates and hot filaments on the crystallographic orientation of diamond films and the characteristics of diamond coated tools was investigated in bias-enhanced HFCVD system in this paper. The cutting performance of diamond coated tools was verified by the experiments of cutting particles reinforced aluminum base composite material with 15 vol.% Si as compared with uncoated ones. The quality of diamond film was analyzed by means of Scanning Electron Microscopy(SEM), Raman spectroscopy, and X-ray diffraction. The optimization deposition processing was obtained. The relative intensity ratio of (111) facet and (220) facet in the film tested by XRD was one third. The cutting performance of diamond coated tool was improved significantly when machining the Si particle reinforced aluminum-based metal matrix composite; its lifetime was 30 times longer than that of uncoated one. The work done in this paper was of great practical significance to accelerate the industrialization of diamond films coated WC–Co substrates.

scholarly journals Optimisation of the ratio of chitosan, tea polyphenols, and citric acid for avocado preservation and validation of the changes in quality

2021 ◽  
Author(s):  
Lina Luo ◽  
Jiaju Lu ◽  
Erqi He ◽  
Xiaomin Wang ◽  
Shuquan Han
Keyword(s):  
Citric Acid ◽  
High Efficiency ◽  
Technology Development ◽  
Polynomial Regression ◽  
Low Cost ◽  
Statistical Significance ◽  
Tea Polyphenols ◽  
Soluble Solids ◽  
Practical Significance ◽  
Storage Duration

Abstract The effect of chitosan, tea polyphenols, and citric acid on avocado storage duration was investigated using a central composite design and response surface methodology by using Design-Expert software. A quadratic polynomial regression mathematical model was constructed with time as the response value to obtain the best concentration combination of chitosan, tea polyphenol, and citric acid for developing the basis of a low-cost, high-efficiency storage preservative for avocados. The results show that the analysis of variance of the regression model of the avocado storage duration has a p = 0.0003, indicating that the model reaches an extreme level of statistical significance, and the regression coefficient of R2 = 0.9629 indicates a good fit between the model and the equation (96.29%). The optimisation results show that the preservative effect on avocados was the best when chitosan, tea polyphenols, and citric acid were combined at a concentration of 1%, 2% and 2%, respectively, and when the storage duration was 19.2 days. Validation tests confirmed that this composite agent effectively delayed the decrease in hardness, the weight loss rate, the soluble solids, soluble protein and vitamin C（VC） content of avocados and decreased their browning index, similar to the predicted results. These results carry practical significance for guiding avocado storage and preservation technology development.

Research on Laser-Driven Flyer Microforming in Warm Condition

2014 ◽  
Vol 620 ◽  
pp. 83-89 ◽  
Author(s):  
You Juan Ma ◽  
Xiao Wang ◽  
Peng Hui Xu ◽  
Qiang Zhang ◽  
Hui Xia Liu ◽  
...  
Keyword(s):  
Surface Integrity ◽  
High Efficiency ◽  
Laser Energy ◽  
Low Cost ◽  
Three Dimensional ◽  
Aluminum Foil ◽  
Forming Process ◽  
Forming Accuracy ◽  
Forming Temperature ◽  
High Flexibility

Laser-driven flyer micro forming process is a promising microforming technology with the advantage of high efficiency, low cost, high flexibility. A series of experiments are conducted to investigate forming ability of aluminum foil with the thickness of 50μm. The effect of forming temperature and laser energy on forming ability characterized by forming depth, forming accuracy and surface quality is quantitatively analyzed. It is found that forming depth observed through three dimensional topography increases with the enhancement of forming temperature and laser energy. By elevating the forming temperature, the preheated workpiece suffers more homogenous deformation, presenting better forming accuracy. However, a certain degree of deterioration of surface integrity at the forming temperature of 200°C can be attributed to the earlier appearance of micro cracks caused by excessive thinning even at low laser energy. Overall, it is concluded that the optimal forming temperature is appropriately 150°C as the forming depth and forming accuracy is improved with no deterioration of the surface integrity.

Influence of MBE Growth Conditions on Dislocation Densities of GaAs/Ge Epilayers Grown on Silicon Substrates

1985 ◽  
Vol 43 ◽  
pp. 364-365
Author(s):  
K.M. Hones ◽  
P. Sheldon ◽  
B.G. Yacobi ◽  
A. Mason
Keyword(s):  
High Efficiency ◽  
Lattice Mismatch ◽  
Low Cost ◽  
Growth Conditions ◽  
Nonradiative Recombination ◽  
Device Structure ◽  
Si Substrates ◽  
Transmission Electron ◽  
Dislocation Densities ◽  
Dislocation Type

There is increasing interest in growing epitaxial GaAs on Si substrates. Such a device structure would allow low-cost substrates to be used for high-efficiency cascade- junction solar cells. However, high-defect densities may result from the large lattice mismatch (∼4%) between the GaAs epilayer and the silicon substrate. These defects can act as nonradiative recombination centers that can degrade the optical and electrical properties of the epitaxially grown GaAs. For this reason, it is important to optimize epilayer growth conditions in order to minimize resulting dislocation densities. The purpose of this paper is to provide an indication of the quality of the epitaxially grown GaAs layers by using transmission electron microscopy (TEM) to examine dislocation type and density as a function of various growth conditions. In this study an intermediate Ge layer was used to avoid nucleation difficulties observed for GaAs growth directly on Si substrates. GaAs/Ge epilayers were grown by molecular beam epitaxy (MBE) on Si substrates in a manner similar to that described previously.

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

2019 ◽  
Author(s):  
Charlys Bezerra ◽  
Géssica Santos ◽  
Marilia Pupo ◽  
Maria Gomes ◽  
Ronaldo Silva ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Polyvinyl Alcohol ◽  
High Efficiency ◽  
Electrochemical Impedance ◽  
Pechini Method ◽  
Low Cost ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Calcination Temperatures ◽  
Service Lifetime

<p>Electrochemical oxidation processes are promising solutions for wastewater treatment due to their high efficiency, easy control and versatility. Mixed metal oxides (MMO) anodes are particularly attractive due to their low cost and specific catalytic properties. Here, we propose an innovative thermal decomposition methodology using <a>polyvinyl alcohol (PVA)</a> as a solvent to prepare Ti/RuO<sub>2</sub>–IrO<sub>2</sub> anodes. Comparative anodes were prepared by conventional method employing a polymeric precursor solvent (Pechini method). The calcination temperatures studied were 300, 400 and 500 °C. The physical characterisation of all materials was performed by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy, while electrochemical characterisation was done by cyclic voltammetry, accelerated service lifetime and electrochemical impedance spectroscopy. Both RuO<sub>2</sub> and IrO<sub>2</sub> have rutile-type structures for all anodes. Rougher and more compact surfaces are formed for the anodes prepared using PVA. Amongst temperatures studied, 300 °C using PVA as solvent is the most suitable one to produce anodes with expressive increase in voltammetric charge (250%) and accelerated service lifetime (4.3 times longer) besides reducing charge-transfer resistance (8 times lower). Moreover, the electrocatalytic activity of the anodes synthesised with PVA toward the Reactive Blue 21 dye removal in chloride medium (100 % in 30 min) is higher than that prepared by Pechini method (60 min). Additionally, the removal total organic carbon point out improved mineralisation potential of PVA anodes. Finally, this study reports a novel methodology using PVA as solvent to synthesise Ti/RuO<sub>2</sub>–IrO<sub>2</sub> anodes with improved properties that can be further extended to synthesise other MMO compositions.</p>

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