scholarly journals Production of sinters from commercial powder mixtures for a matrix of diamond impregnated tools

Mechanik ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 54-55
Author(s):  
Joanna Borowiecka-Jamrozek ◽  
Jan Lachowski
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Composition Analysis ◽  
Powder Mixtures ◽  
Chemical Composition Analysis ◽  
Iron Based ◽  
Commercial Iron ◽  
Size Powder ◽  
Scanning Electron

The paper presents the results of analyzing mechanical properties of the sinters obtained from the commercial iron-based powder mixtures. Parameters mechanic, plastic and density, hardness and porosity of the sinters were determined. The sinters microstructure and the chemical composition analysis were carried out by using the scanning electron microscope. The results were compared with the properties of the sinters obtained from the cobalt SMS (submicron size) powder.

Causes and Removal of Daemonorops margaritae Cane’s Discoloration

2013 ◽  
Vol 634-638 ◽  
pp. 909-912
Author(s):  
Wen Hua Lv ◽  
Ze Hui Jiang ◽  
Xing E Liu ◽  
Jun Liang Liu
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Composition Analysis ◽  
Electron Microscope Observation ◽  
Bleaching Agent ◽  
Aging Study ◽  
Chemical Composition Analysis ◽  
Xenon Light ◽  
Scanning Electron

Through chemical composition analysis, scanning electron microscope observation, stain-fungi isolation from stained canes and their inoculation on unstained canes, as well as xenon light aging study, causes of Daemonorops margaritae cane’s discoloration were investigated. Results show that the yellow discoloration is mainly chemical photo-induced and the blue, brown and red stains are mainly resulted from the stain-fungi’s mycelia colors or secreted pigments. A treatment with hydrogen peroxide solution as main bleaching agent was explored. All the above discoloration could be effectively removed and renewed to be attractive lustrous yellowish.

scholarly journals Analysis and Research on the Cause of Wind Turbine Blade Bolt Fracture

2021 ◽  
Vol 2133 (1) ◽  
pp. 012028
Author(s):  
Feng Yun ◽  
Jun Liu ◽  
Chunyu Liu ◽  
Xiaochun Zhao
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Stress Concentration ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Farm ◽  
Composition Analysis ◽  
Chemical Composition Analysis ◽  
Mechanical Properties Testing ◽  
Load Impact

Abstract In 2019, inspection personnel of a wind farm went to the tower and found that a total of 6 bolts of blades in the hub of a wind turbine had broken and failed. In order to find out the cause of fracture, the fracture bolt was comprehensively detected and analyzed by means of appearance morphology analysis, chemical composition analysis, mechanical properties testing, microstructure testing and fracture micro-area analysis. The results show that the main reasons for the bolt fracture are as follows: under the action of the bolt’s constantly changing and repeated wind load impact and the alternating load caused by blade rotation during the operation of the fan, the crack source is formed along the bottom of the thread with serious stress concentration and expands in fatigue mode until the whole fracture fails.

Investigation of Rare-Earth Salt Refiner on Purifying Effect of Impure Red Copper

2014 ◽  
Vol 898 ◽  
pp. 436-439
Author(s):  
Bao Jun Han
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Composition Analysis ◽  
Effect Mechanism ◽  
Scanning Electron ◽  
The Rare Earth

A method to fabricate a new kind rare earth salt refiner for purifying impure red copper was introduced in present paper, and the application of which on deoxidization, conductivity and mechanical properties of impure red copper were also inspected by composition analysis, Scanning Electron Microscope (SEM) and mechanical properties test technologies. The effect mechanism of the rare earth salt refiner on the performance of red copper was discussed in detail in this paper.

Preparation of Calcined Phosphogypsum-Based High-Strength Supersulphated Cement

2012 ◽  
Vol 188 ◽  
pp. 199-204 ◽  
Author(s):  
Yu Xin Gao ◽  
Bao Ying Yu ◽  
Fen Lian Xu ◽  
Xi Hua Lin ◽  
Shi Hai Yang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Setting Time ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Composition Analyzer ◽  
Scanning Electron ◽  
Curing Age

Based on mechanical properties, the influences of the clinker dosage(C1, C2, C3), calcination temperature(M1, M2, M3) of phosphogypsum(PG) and specific surface area(S1, S2, S3, S4) on the mechanical properties of supersulphated cement(SSC) were systematically studied; Then SSC with different kinds of PG were chose to research water requirement of normal consistency, setting time and soundness; Strengthening mechanism on SSC were further investigated and analyzed with scanning electron microscope(SEM) and chemical composition analyzer at last. Results showed SSC with conditions of C2, T3 and S3 has 36.4, 56.5 and 72.6MPa standard mortar compressive strength at 7d, 28d and 56d curing age. Calcined Phosphogypsum(CPG)-based high strength SSC is successfully developed.

scholarly journals Effect of Microstructure on Mechanical Properties of BA1055 Bronze Castings

2014 ◽  
Vol 14 (2) ◽  
pp. 73-78 ◽  
Author(s):  
J. Łabanowski ◽  
T. Olkowski
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Scanning Electron Microscope ◽  
Aluminum Bronze ◽  
Marine Propellers ◽  
Casting Technology ◽  
Alloy Microstructure ◽  
Scanning Electron

Abstract The article presents research results performed on aluminum bronze CuAl10Fe5Ni5 (BA1055) castings used for marine propellers. Metallographic studies were made on light microscope and a scanning electron microscope to assess quantitatively and qualitatively the alloy microstructure. It has been shown that the shape, size and distribution of the iron-rich к−phase precipitates in bronze microstructure significantly affect its mechanical properties. With an increase in the number of small к−phase precipitates increases the tensile strength of castings, while the presence of large globular precipitates improves ductility. Fragmentation and shape of κ−phase precipitates depends on many factors, particularly on the chemical composition of the alloy, Fe/Ni ratio, cooling rate and casting technology.

Effect of Microstructure State of Titanium Alloy Ti-6Al-4V on Structure and Mechanical Properties of Joints Produced by Diffusion Bonding Process

2014 ◽  
Vol 783-786 ◽  
pp. 2659-2664 ◽  
Author(s):  
Nikolay Lopatin ◽  
Kirill Senkevich ◽  
Egor A. Kudryavtsev
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Electron Diffraction ◽  
Diffusion Bonding ◽  
Bonding Process ◽  
Fine Grained ◽  
Α Phase ◽  
Scanning Electron

The studies of diffusion bonded samples of Ti-6Al-4V and Nitinol alloys were carried out considering the titanium alloy in two states: ultra-fine grained and bi-modal microstructures, the last one consisted of small and large α-phase grains. Depending on microstructure and chemical composition of the alloys, the diffusion bonding had been made at temperatures from 600°C to 850°C. The microstructures of joints was studied by scanning electron microscope using detector of backscattering electron diffraction. The shear strengths of joints were measured. It was concluded that the ultra-fine grained Ti-6Al-4V alloy could be applied for joints manufactured at a temperature lower than 750°C. The bi-modal Ti-6Al-4V alloy is an effective material for producing the joints at the temperature larger that 750°C.

scholarly journals Characterization of Ni-P coating prepared via electroless deposition on AZ31 magnesium alloy

2017 ◽  
Vol 61 (1) ◽  
pp. 1-6 ◽  
Author(s):  
M. Buchtík ◽  
P. Kosár ◽  
J. Wasserbauer ◽  
P. Doležal
Keyword(s):  
Chemical Composition ◽  
Magnesium Alloy ◽  
Electroless Deposition ◽  
Mechanical Characteristics ◽  
Chemical Properties ◽  
Composition Analysis ◽  
Physico Chemical ◽  
Chemical Composition Analysis ◽  
Scanning Electron

Abstract This work deals with the characterization of Ni–P coating prepared via electroless deposition on wrought AZ31magnesium alloy. For the application of electroless deposition was proposed and optimized a suitable pretreatment process of magnesium alloy surface followed by Ni–P coating in the nickel bath. The chemical composition of Ni–P based coating was characterized using the scanning electron microscope with chemical composition analysis. Next, physico-chemical properties and mechanical characteristics of Ni–P coating were evaluated. The mechanism of corrosion degradation of the coating and the substrate was also studied in this work.

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