Researches Regarding Ti/W/TiC Triple Layers Deposition on the Ferritic-Pearlitic Cast Iron Support, Obtained by Electro-Spark Deposition Method

2013 ◽  
Vol 371 ◽  
pp. 363-367 ◽  
Author(s):  
Carmen Nejneru ◽  
Manuela Cristina Perju ◽  
Mihai Axinte
Keyword(s):  
Cast Iron ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Layer Thickness ◽  
Surface Quality ◽  
Deposition Method ◽  
Characteristics Analysis ◽  
Part Surface

This paper contains a layer characteristics analysis layer thickness, chemical analysis, surface quality-for the triple deposition with Ti, W and TiC on the ferritic-perlitic cast iron support, using electro-spark deposition method. The resulted surface quality by electro-spark deposition method is dependent by the quality and chemical composition of the electrode. The obtained layer was realized by multiple successive depositions, using different electrodes to combine the beneficial characteristics of the part surface with the appropriate succession.

scholarly journals Effect of Nickel Equivalent on Austenite Transition Ratio in Ni-Mn-Cu Cast Iron

2013 ◽  
Vol 13 (2) ◽  
pp. 53-58 ◽  
Author(s):  
A. Janus ◽  
A. Kurzawa
Keyword(s):  
Cast Iron ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Wall Thickness ◽  
Brinell Hardness ◽  
Austenite Decomposition ◽  
Structural Components ◽  
Microscopy Image ◽  
Image Analyser ◽  
Nickel Equivalent

Abstract Determined was quantitative effect of nickel equivalent value on austenite decomposition degree during cooling-down castings of Ni-Mn- Cu cast iron. Chemical composition of the alloy was 1.8 to 5.0 % C, 1.3 to 3.0 % Si, 3.1 to 7.7 % Ni, 0.4 to 6.3 % Mn, 0.1 to 4.9 % Cu, 0.14 to 0.16 % P and 0.03 to 0.04 % S. Analysed were castings with representative wall thickness 10, 15 and 20 mm. Scope of the examination comprised chemical analysis (including WDS), microscopic observations (optical and scanning microscopy, image analyser), as well as Brinell hardness and HV microhardness measurements of structural components.

The chemical composition of leucoxene in Cainozoic bauxite from Boolarra, Victoria

1942 ◽  
Vol 26 (179) ◽  
pp. 273-274 ◽  
Author(s):  
A. B. Edwards
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Olivine Basalt ◽  
Pure Sample ◽  
Residual Structure ◽  
Aluminium Titanate

During a petrological examination of samples of bauxite from Boolarra, in south Gippsland, Victoria, it was noted that some specimens of the bauxite, which is largely derived from Tertiary olivine-basalt, contained numerous grains of yellow-brown to amber-yellow leucoxene. The leucoxene is clearly pseudo-morphous after ilmenite, residual particles of ilmenite being enclosed in many of the leucoxene grains. Most of the leucoxene grains are opaque, but occasional grains are translucent to transparent, though isotropic. Some of them show parallel markings suggestive of cleavage, but probably a residual structure from the replaced ilmenite. In view of the highly aluminous nature of the enclosing rock, there seemed some possibility that this mineral might be the little-known aluminium titanate, xanthitane. It was thought, therefore, that if a pure sample of the mineral could be prepared, a chemical analysis would establish its identity.

Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials

2007 ◽  
Vol 24-25 ◽  
pp. 229-232
Author(s):  
S.L. Ma ◽  
Wei Li ◽  
Cong Rong Zhu ◽  
J. Zhang ◽  
H.C. Ye
Keyword(s):  
Grain Size ◽  
Cast Iron ◽  
Tungsten Carbide ◽  
Surface Quality ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Different Grain Size ◽  
Grinding Efficiency ◽  
Machining Properties

Tungsten carbide which is a hard and brittle material was ground by cast-iron bonded diamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of getting high efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels with different grain size were adopted to get different grinding efficiency and surface quality of workpieces. The grinding properties of cast-iron bonded grinding wheels with different grain size and the ground surface quality of tungsten carbide are discussed in this paper. The experiment results indicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grain size is higher, and it could make the dimension accuracy of the workpiece controllable, but the wheel with smaller grain size could get better ground surface quality. The two grinding phases are decided by the ratio between the size of abrasive grain and the thickness of the oxide layer on the grinding wheel.

scholarly journals Elementary chemical analysis in leaves infected by fumagina by X-Ray fluorescence technique

2007 ◽  
Vol 50 (5) ◽  
pp. 851-860 ◽  
Author(s):  
Maria Sélia Blonski ◽  
Carlos Roberto Appoloni ◽  
Paulo Sérgio Parreira ◽  
Pedro Henrique Arruda Aragão ◽  
Virgilio Franco Nascimento Filho
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Fluorescence Technique ◽  
Energy Dispersion ◽  
X Ray ◽  
Set Up ◽  
Elementary Chemical ◽  
Cu And Zn

Energy Dispersion X-Ray Fluorescence Technique (EDXRF) was employed to study the effects of the fumagina disease on the elementary chemical composition of the leaves. The experimental set up consisted of a Mo X-ray tube (Ksub<FONT FACE=Symbol>µ</FONT> = 17.44 keV) with Zr filter and a Si (Li) detector. The measurements were performed with the infected and healthy leaves of citric plants. The elements Ti, Mn, Fe, Cu and Zn were quantified, with an average DL of 69, 12, 8, 4 and 4 µg.g-1 respectively. The obtained concentration for Fe varied from 44 to 192 µg.g-1 in healthy leaves and from 363 to 704 µg.g-1 in infected leaves with fumagina .

SURFACE ROUGHNESS IMPROVEMENT OF PARTS MADE OF POLYMERIC MATERIALS OBTAINED BY MEANS OF ADDITIVE TECHNOLOGIES

2021 ◽  
Vol 2021 (7) ◽  
pp. 12-18
Author(s):  
Mikhail Kulikov ◽  
Maksim Larionov ◽  
Denis Gusev ◽  
Evgeniy Shevchuk
Keyword(s):  
Surface Quality ◽  
Polymeric Materials ◽  
Additive Technologies ◽  
Abrasive Tool ◽  
Technological Basis ◽  
Dry Processing ◽  
Investigation Methods ◽  
Before And After ◽  
Part Surface ◽  
Surface Layer Quality

In the paper there is under consideration an effort to achieve the roughness index of Ra <0.8 with the aid of soft abrasive tool use. As a result the purpose of this work became development of the technology for surface quality improvement of parts manufactured with the aid of additive technologies. The authors carried out a number of experiments with the samples manufactured with the aid of the method of FDM print. With the aid of 3D Ultra 3 printer of EnvisionTec company. The samples were made of ABS-plastic in the amount of 6 pieces. On each sample there were defects after printing which contributed to the deterioration of surface quality in products. By means of TR220 profilometer there was measured roughness before and after the experiment. There was carried out dry processing and with the use of SCL. As a result, dry processing resulted in worsening surface quality, heavy wear of an abrasive tool and grain contamination. Analyzing the data obtained from the profilometer in the experiment and SCL use a considerable improvement of the surface layer quality at minimum allowance is observed. Investigation methods: in the work basis there are experimental methods of investigation. The investigations are carried out with the use of a microscope and profilometer. Processing investigation results was carried out as a result of the comparison of the measuring data obtained. Work Novelty: there are defined conditions of soft abrasive tool operation and SCL impact upon Ra indices. The results obtained indicate a possibility of Ra improvement on a part surface which is achieved due to a combined shaping with the aid of additive technologies and further machining carried out on a single technological basis. The experience without SCL use has shown the overheating possibility the result of which is a meltback and plastic sticking both on the surface, and on abrasive grains of the cutter which is inadmissible and results in considerable worsening of Ra on the surface machined and cutter wear. In view of this the SCL use in finishing is promising, but to achieve better results SCL chemistry must be improved.

SLS Process Parameter Optimization to Improve Surface Quality and Accuracy of Polyamide Parts

2021 ◽  
Vol 11 (4) ◽  
pp. 57-74
Author(s):  
Sunil Dutt Baloni ◽  
Somesh K. Sharma ◽  
Jagroop Singh ◽  
Sushant Negi
Keyword(s):  
Surface Roughness ◽  
Layer Thickness ◽  
Surface Quality ◽  
Manufacturing Industry ◽  
Selective Laser Sintering ◽  
Anova Analysis ◽  
Part Quality ◽  
Bed Temperature ◽  
Optimal Surface ◽  
Part Orientation

The contribution of selective laser sintering (SLS) technique in the 4.0 manufacturing industry is undisputedly significant. SLS part quality exhibits high dependence on SLS process parameters and is a major challenge. Therefore, this research aims to investigate the effect of input parameters (i.e., part orientation, bed temperature, and layer thickness) on the surface roughness and accuracy of laser-sintered polyamide specimens. Response surface methodology (RSM) and ANOVA analysis aided the testing and evaluation. Optimal working conditions for minimum shrinkage were 0.17 mm layer thickness, 177.89°C part bed temperature, and part orientation at 88.91 degrees. The surface quality deteriorated with the increment in part bed temperature and layer thickness, and it shows an inverse trend (or improves) with the part orientation in the prescribed range. The optimal surface roughness was at a layer thickness of 0.11 mm, bed temperature at 174.55°C, and part orientation at 86.5 degrees.

scholarly journals Hot metal desulfurization by marble waste and fluorspar

2012 ◽  
Vol 65 (2) ◽  
pp. 233-240 ◽  
Author(s):  
Felipe Nylo de Aguiar ◽  
Felipe Fardin Grillo ◽  
Jorge Alberto Soares Tenório ◽  
José Roberto de Oliveira
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Pig Iron ◽  
Hot Metal ◽  
Industrial Mixture ◽  
Desulfurization Process ◽  
Hot Metal Desulfurization ◽  
Vacuum Sampling ◽  
Marble Waste

The objective of this paper is to present an analysis of the use of residual marble mixtures in the pig iron desulfurization process. The study involved the use of: marble waste, fluorspar, lime, and hot metal. Four mixtures were made and added to a liquid hot metal - with known chemical composition - at a temperature of 1450ºC. The mass of each element was calculated from its chemical analysis and compared with an industrial mixture. All of the four mixtures used in the experiments were stirred by a mechanical stirrer. Samples were collected by vacuum sampling for times of 5, 10, 15, 20, and 30 minutes, and analysis was performed to check sulfur variation in the bath with time. The results were analyzed and they verified that it was possible to use marble waste as a desulfurizer.

scholarly journals Failure Analysis of fractured Fixing Bolts of a Mobile Elevating Work Platform using Finite Element Methods

2019 ◽  
Author(s):  
DongHoon Choi ◽  
Jae-Hoon Kim
Keyword(s):  
Finite Element ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Failure Analysis ◽  
Visual Inspection ◽  
Standard Procedure ◽  
Fatigue Analysis ◽  
Certification Authority ◽  
Element Analysis ◽  
Safety Certification

Mobile elevating work platforms (MEWPs) consist of a work platform, extending structure, and chassis, and are used to move persons to working positions. MEWPs are useful but are composed of pieces of equipment, and accidents do occur owing to equipment defects. Among these defects, accidents caused by the fracture of bolts fixed to the extension structure and swing system are increasing. This paper presents a failure analysis of the fixing bolts of MEWP. Standard procedure for failure analysis was employed in this investigation. Visual inspection, chemical analysis, tensile strength measurement, and finite element analysis (FEA) were used to analyze the failure of the fixing bolts. Using this failure analysis approach, we found the root cause of failure and proposed a means for solving this type of failure in the future. First, the chemical composition of the fixing bolt is obtained by a spectroscopy chemical analysis method, which determined that the chemical composition matched the required standard. The tensile test showed that the tensile and yield strengths were within the required capacity. The stress analysis was carried out at five different boom angles, and it was determined that the fixing bolt of MEWP can withstand the loads at all the boom angles. The outcomes of the fatigue analysis revealed that the fixing bolt fails before reaching the design requirements. The results of the fatigue analysis showed primarily that the failure of the fixing bolt was due to fatigue. A visual inspection of the fractured section of the fixing bolt also confirmed the fatigue failure. We propose a method to prevent failure of the fixing bolt of the MEWP from four different standpoints: the manufacturer, safety certification authority, safety inspection agency, and owner.

scholarly journals ANALISIS BEBERAPA UNSUR KIMIA KOMPOS Azolla mycrophylla

2018 ◽  
Vol 14 (2) ◽  
pp. 60-5
Author(s):  
Sri Utami Lestari ◽  
Muryanto Muryanto
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Rainy Season ◽  
Nutrient Content ◽  
N Fertilizer ◽  
High Nitrogen ◽  
Leaf Part

The most consumed part of the plants is the leaf part so that the fertilizer provided should contain high nitrogen (N). The nature of the N fertilizer is volatile and when the rainy season there can be washing.  When plants deficienci nutrients shows symtoms of yellowing leaves so that the application of N fertilizer to the plant must remain unfulfilled.  Azolla is a usable alternative.  Azolla has a high N nutrient content because it is symbiotic with anabaena in binding to free nitrogen in the air.             The purpose of this study was to determine the chemical composition (pH,N,P,K) Azolla mycrophylla.  The experiment was conducted experimentally with the first stage of composting azolla after it was done chemical analysis in the laboratory.  The result of this research can be concluded that chemical analysis of Azolla mycrophylla cpmpost is as follows :pH 7,17, N 2,57%, P 0,34%, K 0,03%.  

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