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Statement of problem: The effect of clinical adjustments on the strength of cemented computer-aided design and computer-aided manufacturing (CAD-CAM) monolithic materials under aging challenge is unclear. Purpose: The purpose of this in vitro study was to assess the surface roughness and fracture resistance (with or without mechanical aging) of cemented CAD-CAM monolithic materials submitted ...
Effect of mechanical grinding on the electrochemical hydrogen storage properties of Mg–Ni–Y alloy. Yanghuan Zhang 1,2, Zeming Yuan 2, Tai Yang 2, Yan Qi 2 & Dongliang Zhao 2 Journal of Solid State Electrochemistry volume 19, pages 1187–1195 (2015)Cite this article
In the machining operations, final surface finish and dimensional accuracy are the most specified customer requirements. Hard turning machining operation using cubic boron nitride tool as an alternative of grinding process is a type of turning operation in which hardened steel are machined with the hardness greater than 45 HRc. During the hard turning operation because of the hard condition ...
A cellulose nanocrystal (CNC) suspension can form liquid crystal films with unique self-assembly behaviors. This gives CNC films a special iridescence, which has potential in many aspects, but the brittleness of pure CNC films limits their application. In this work, we propose a simple physical mixing method to obtain CNC film by adding D-sorbitol as a plasticizer.
Graphene has been proven to be a promising material for various applications due to its outstanding chemical, physical, optical as well as mechanical properties. To further improve these properties of graphene, here we apply a grinding method with various speeds (100–600 rpm) of …
gear shaving, rolling or grinding to attain the gear quality grade. Even after the heat treatment ... (pitch circle diameter) of the gear being generated is reached. ... Over the years mechanical linkages have been gradually simplified reducing the effect of play,,,: ...
12%Effect of Different Types of Nanostructured Additives and Mechanical Action on Pitch Matrix Properties for Producing Artificial Graphite ... prepared using modified pitch. The effect of adding nanoparticles on coke structural strength from modified pitch prepared from coal-tar and shale resins was studied. ... grinding of coke to a fraction ...
3. The chatter pitch, which is the separation, peak to peak, of the "wave marks" or chatter marks on the workpiece. Let's say you had 200 SFM surface speed, a 4 flute cutter, and 0.005″ separation of marks. Here is what G-Wizard's Chatter Calculator would show: G-Wizard Chatter Calculator…
Effect of mechanical grinding of MCPM and CaO mixtures on their composition and on the mechanical properties of the resulting self-setting hydraulic calcium phosphate cements. Siham Serraj 1, Philippe Boudeville 1 & Alain Terol 1 Journal of Materials Science: Materials in Medicine volume 12, pages 45–50 (2001)Cite this article
Mechanical treatment of the bleached softwood sulfate pulp (Arkhangelsk CPF, Russia) was performed using laboratory grinding complex LRK-1 (UkrSRIP, Ukraine) with the setting of diamond garniture from 0.1 to 0.4 mm for reaching 93 Schopper-Riegler (SR) degrees freeness.
Harmful vibrations during mechanical processing (such as grinding or milling) have to be avoided since they deteriorate the quality of the product as well as have a negative effect on the human ...
Introduction: This study aimed to compare the effects of pitch length and heat treatment on the mechanical properties of glide path establishing instruments. Methods: Prototypes of glide path preparation files (#14/.03 taper) were made to evaluate the effects of different pitch lengths and heat treatments. The files were divided into 4 groups according to the pitch length (pG and OneG) and ...
Then there is mechanical tearing of those bonds leading to SiO 2 removal instead of removal of lumps of Silicon Hydroxide (Si(OH) 4). [2] 3.1.1 Pitch Polishing: It is one of the most historic processes and has been used since ages. Pitch is a very complex material. There is
ground by loose abrasive grinding (alumina particles 9-30 P m) on a glass lap with the addition of larger alumina particles at various concentr ations with mean sizes ranging from 15-30 P m, or 2) polished (using 0.5 P m cerium oxide slurry) on various laps (polyurethanes pads or pitch) with
Thermal effects on mechanical grinding-induced surface texture in tetragonal piezoelectrics - Volume 22 Issue 10
Effect of mechanical grinding of pitch-based carbon fibers and graphite on their electrochemical sodium insertion properties October 2000 Electrochimica Acta 46(1):39-47
The invention discloses solar energy prism processing equipment, and provides a precise grinding machine for processing a solar energy prism, which has the advantages of high automation degree and high processing precision, and is time-saving and labor-saving in clamping, and accurate in blank positioning. According to the precise grinding machine, the technical problems of time and labor ...
Mechanical grinding effects were investigated for the single crystals (1c) and powder (1p) of imidazolium hydrogen succinate.The high-temperature phase partially precipitated, while the bulk structural transition observed for 1c was suppressed in 1p.. 1p showed drastically higher proton conductivity with lower activation energy than 1c at a lower temperature.
Pitch of base circle and corresponding center angle. ... In the grinding process, if the grinding thermal effect is greater than the mechanical extrusion effect of grinding force, the workpiece surface would show residual tensile stress. On the contrary, it shows residual compressive stress. In this study, the influence of work hardening and ...
@article{osti_898584, title = {Sub-surface mechanical damage distributions during grinding of fused silica}, author = {Suratwala, T I and Wong, L L and Miller, P E and Feit, M D and Menapace, J A and Steele, R A and Davis, P A and Walmer, D}, abstractNote = {The distribution and characteristics of surface cracking (i.e. sub-surface damage or SSD) formed during standard grinding …
Effect of mechanical grinding of hydromagnesite on the reaction pathway and kinetic behaviors of the thermal decomposition process was investigated by means of thermoanalytical techniques, together with crystallographic and morphological measurements. A crystalline hydromagnesite, the as-received sample, was decomposed in two distinguished mass loss steps of …
The present work deals with the effect of graphite addition on selected mechanical and tribological properties of pitch-based granular carbon composites. Three pitches (a commercial impregnating coal tar pitch, an air-blown pitch and a thermally treated coal tar pitch) and anthracite particles as reinforcing material were used to prepare carbon composites to be tested as carbon brake …
Influence of moderate mechanical grinding on electrochemical properties of pitch-based fibers Sodium insertion appears to be dependent of the graphitization degree of the carbon host and consequently of the structural defects content. Mechanical grinding can create such defects.
The wurtzite-sphalerite dimorphism of CdSe is studied by following the effect of high-energy mechanical grinding on the wurtzite form. X-ray powder-diffraction patterns are collected at different grinding times. A drastic modification in the initial wurtzite pattern is found already after 90 min grinding. The main effect is the progressive quenching of those Bragg reflections of wurtzite that ...
Chemical mechanical polishing (CMP) is a semiconductor process that is used to achieve global planarization. To maintain the stability and the throughput of CMP, the polishing pad needs to be dressed by a diamond dresser. By calculating the distribution of the scratch numbers of diamond grits in the pad, the effect of dressing can be estimated and the pad profile can be predicted.
The addition of D-sorbitol with a low concentration can improve the mechanical properties and have less influence on optical properties. The wavelength of the selectively reflected phenomenon decreased by 5 nm and the pitch of the chiral structure decreased from 406 to 362 nm, with the D-sorbitol concentration increasing up to 6%.
This paper examines failure of helical gear in speed increasing gearbox used in the wind turbine generator (WTG). In addition, an attempt has been made to get suitable gear micro-geometry such as pressure angle and tip relief to minimize the gear failure in the wind turbines. As the gear trains in the wind turbine gearbox is prearranged with higher speed ratio and the gearboxes experience ...
Sometimes, heating can induce a positive effect on the overall grinding efficiency. However, excess heat generation can lead to the depolymerization of rubber particles and production fumes, which give the potential risk of fire hazards, in addition too much heat deteriorates the mechanical properties of the ground materials.
The effects of mechanical grinding on morphology and electrochemical performance of graphite and soft carbon powders with respect to lithium insertion were studied. The morphology of the milled graphitic powders was found to depend strongly upon the nature of the interactions (e.g., impact or shear) generated by the two kinds of mixer mills used.
Abstract: In this study, pyrolusiteore (MnO2) was subjected to mechanical milling with a high-energy mill with carbonized tea plant wastes and the effect of grinding time on the crystal structure of the material was investigated. The ratio of Mn/Fe was 8/1, the ratio of C/(MnO2 + Fe3O4) was 2 and the ratio of ball to ore was 10/1. The samples ...
mechanical force as grinding to reduce the particle size resulted in rupture of xylem vessels and other tissues. Thus resulted in the collapse of the tube and loss of ability to trap glucose or bile acid into fiber matrix, which hence gave an adverse effect on DF functional properties.
the workpiece, this study investigates the effects of equal pitch coil (EPC), variable pitch coil (VPC), and variable radius coil (VRC) on the temperature distribu-tion of the workpiece. The induction heating quality and production efficiency of the workpiece were quan-titatively studied using different coil shapes and electro-magnetic parameters.
The specific objectives were to investigate the effects of DDR on (i) carbon fiber microstructure, (ii) fiber mechanical properties, and (iii) fiber transport properties. To accomplish these goals, precursor pitch fibers were melt-spun from a synthetic, naphthalene-based mesophase pitch using multiple sets of ultrafine diameter spinnerets
The aim of this study was to systematically review the literature to assess the effect of grinding on the mechanical properties, structural stability and superficial characteristics of Y-TZP ceramics. The MEDLINE via PubMed and Web of Science (ISI - Web of Knowledge) electronic databases were search …
Traditional mechanical grinding utilizes the cutting edges of abrasive grains on the grinding wheel to produce the fine surface finishes. However, the sharpness of grinding wheels becomes dull with the processing time, so that the truing and dressing of the wheels are required to achieve the ultraprecision surface finish.
The aim of this study was to systematically review the literature to assess the effect of grinding on the mechanical properties, structural stability and superficial characteristics of Y-TZP ceramics. The MEDLINE via PubMed and Web of Science (ISI - Web of Knowledge) electronic databases were search …
Three self-sintered graphite blocks (SGs) were prepared from green pitch cokes with different average grain sizes (5.1, 3.1 and 1.9 μm) using cold isostatic compaction. The microstructures and properties of the SGs were characterized by XRD, …
Mechanical grinding is a method of manufacturing a common metal cutting, the bearing processing industry also been widely used, the bearing parts of heat hardening, or reticular cracking may occur more rules during grinding arrangement of small cracks, known as grinding cracks, it not only affects the appearance of bearing parts, more importantly, also directly affect the quality of the ...
The Chemical Mechanical Polishing (CMP) process is now widely employed in the manufacture of Ultra-Large-Scale Integrated (ULSI) circuits. Yet, the effects of various process parameters on the material removal rate (MRR) and the resulting surface topography are not well understood. In this chapter, accordingly, several polishing models are reviewed
