Microgrinding of Nanostructured Carbide Coatings: Ground Surface and Subsurface Damage Observations

2006 ◽  
Vol 304-305 ◽  
pp. 276-280 ◽  
Author(s):  
Y.H. Ren ◽  
Zhi Xiong Zhou ◽  
Zhao Hui Deng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Material Removal ◽  
Ground Surface ◽  
Subsurface Damage ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Carbide Coatings ◽  
Subsurface Layers ◽  
Scanning Electron

Surface microgrinding of the nanostructured WC/12Co coatings have been undertaken with diamond wheels under various conditions. Nondestructive and destructive approaches were utilized to assess damage in ground nanostructured coatings. Different surface and subsurface configurations were observed by scanning electron microscopy. This paper investigates the effects of microgrinding conditions on damage formation in the surface and subsurface layers of the ground nanostructured WC/12Co coatings. And the material-removal mechanism has been discussed.

Morphology of Surfaces Generated by Circular Wire Brushes

1995 ◽  
Vol 117 (1) ◽  
pp. 9-15 ◽  
Author(s):  
R. J. Stango ◽  
R. A. Fournelle ◽  
S. Chada
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Material Removal ◽  
Qualitative Theory ◽  
Characteristic Surface ◽  
Wire Brushing ◽  
Transfer Mechanisms ◽  
Scanning Electron ◽  
Subsurface Microstructure

The characteristic surface that is generated during orthogonal wire brushing of a flat 6061-T6 aluminum workpart is examined in this paper. Scanning electron microscopy is used for characterizing the surface topography, whereas subsurface microstructure and properties of the brushed region are evaluated by both metallography and microhardness measurements. The unique topographical characteristics of the contact zone suggest material removal and subsequent redeposition onto the workpart. On the basis of the experimental observations, a qualitative theory is advanced which identifies transfer mechanisms for removal and redeposition of aluminum alloy.

scholarly journals Advanced ceramics: evaluation of the ground surface

Cerâmica ◽  
2003 ◽  
Vol 49 (311) ◽  
pp. 174-177 ◽  
Author(s):  
E. C. Bianchi ◽  
P. R. Aguiar ◽  
E. J. da Silva ◽  
C. E. da Silva Jr. ◽  
C. A. Fortulan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ground Surface ◽  
Cutting Conditions ◽  
Grinding Wheels ◽  
Advanced Ceramics ◽  
Diamond Grinding ◽  
Quality Surface ◽  
Scanning Electron

The aim of this research is to evaluate the influence of grinding and cutting conditions on surfaces of advanced ceramics ground with diamond grinding wheels containing a binding resin bond. The quality surface was analyzed by Scanning Electron Microscopy (SEM).

Comparative Study on the Materials Removal Mechanism of Ceramics and Steels

2008 ◽  
Vol 389-390 ◽  
pp. 18-23
Author(s):  
Jian Qiang Guo ◽  
Hitoshi Ohmori ◽  
Kazutoshi Katahira ◽  
Yoshihiro Uehara
Keyword(s):  
Comparative Study ◽  
Material Removal ◽  
Ground Surface ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Grinding Forces ◽  
Dressing Method ◽  
The Difference ◽  
Induced Defects

Ceramics has many advantages that cannot be substituted by metals, but its machining induced defects, such as crack and crater, are the obstacle of using ceramics in engineering. Thus, the further studies on the materials removal mechanism of ceramics should be done. As known, the cutting theory of metals is very successful and it is helpful to understand the material removal mechanism of ceramics. Through doing comparative experiments, the material removal mechanism of ceramics may be more deeply ascertained. Four types of material, such as ZrO2, SiC, STAVAX and SKD11, were ground by ELID (ELectrolytic In-process Dressing) method in this study. The grinding forces, roughness and topography of the ground surface were investigated. On the basis of this experiment, the difference of material removal mechanism between ceramics and steels was explained.

Behavior of Some Tungsten Carbide Coatings in Molten Zinc

1996 ◽  
Author(s):  
A.J. Stavros
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tungsten Carbide ◽  
The Other ◽  
Time To Failure ◽  
X Ray Diffraction ◽  
Molten Zinc ◽  
X Ray ◽  
Carbide Coatings ◽  
Scanning Electron

Abstract Two different W-Co-C powders were used in three deposition devices, the Super D-Gun, Jet Kote, and JP-5000 to produce coatings for laboratory immersion tests in molten zinc and %55Al-Zn. Resistance was evaluated as time to failure. Scanning electron microscopy and X-ray diffraction were used to characterize the structures ssid failure mechanism. All coatings were found to fail when the molten metal breached the coating thickness at weak spots and spread out over the underlying interface to lift the coating away from the underlying 316L substrate. These weak spots were "pits" on one Super D-Gun coating (the most resistant coating) and cracks on all the other coatings. No diffusion of zinc through the tungsten carbide coatings was observed.

scholarly journals Molecular Dynamics Simulation on Cutting Mechanism in the Hybrid Machining Process of Single-Crystal Silicon

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Changlin Liu ◽  
Wenbin He ◽  
Jianning Chu ◽  
Jianguo Zhang ◽  
Xiao Chen ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Material Removal ◽  
Subsurface Damage ◽  
Machining Process ◽  
Dynamics Simulation ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Cutting Mechanism ◽  
Hybrid Machining ◽  
Hybrid Machining Process

AbstractIn this paper, molecular dynamics simulations are carried out to investigate the cutting mechanism during the hybrid machining process combined the thermal and vibration assistants. A modified cutting model is applied to study the material removal behavior and subsurface damage formation in one vibration cycle. The results indicate that during the hybrid machining process, the dominant material removal mechanism could transform from extrusion to shearing in a single vibration cycle. With an increase of the cutting temperature, the generation and propagation of cracks are effectively suppressed while the swelling appears when the dominant material removal mechanism becomes shearing. The formation mechanism of the subsurface damage in one vibration cycle can be distinct according to the stress distribution. Moreover, the generation of the vacancies in workpiece becomes apparent with increasing temperature, which is an important phenomenon in hybrid machining process.

Edge Grinding of Ceramic Tile by Diamond Cup Wheels

2006 ◽  
Vol 304-305 ◽  
pp. 85-89 ◽  
Author(s):  
Hui Yuan ◽  
Y.P. Cheng ◽  
Cheng Yong Wang ◽  
Ying Ning Hu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Wear Resistance ◽  
Surface Morphology ◽  
Ceramic Tile ◽  
Ground Surface ◽  
Test Machine ◽  
Ceramic Tiles ◽  
Cup Wheel ◽  
Scanning Electron

As one of the excellent decorative materials ceramic tiles must be ground and polished to present the glossy surface. In this paper the ceramic tiles were edge ground by diamond cup wheels in the special designed test machine. The surface morphology of the polished ceramic tiles and the wear of diamond cup wheel were examined by Scanning electron microscopy (SEM). The wear resistance of diamond cup wheel and the materials’ removal process of ceramic tiles had been tested. The results showed that the wear of diamond cup wheel was stable when grinding with high grinding ratio. The ground surface showed that only the fracture of ceramic tiles was acted by diamond grits during grinding with water by means of good quality diamond cup wheel.

scholarly journals Investigation of the mechanism of mercury removal from silver- amalgam alloy

2004 ◽  
Vol 69 (12) ◽  
pp. 1111-1120 ◽  
Author(s):  
Zoran Odanovic ◽  
M. Djurdjevic
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermal Treatment ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Dental Amalgam ◽  
Mercury Removal ◽  
Chemical Compositions ◽  
Removal Mechanism ◽  
Scanning Electron

An investigation of silver dental amalgam decomposition and the mercury removal mechanism was performed. The decomposition process was analyzed during thermal treatment in the temperature interval from 400 ?C to 850 ?C and for times from 0.5 to 7.5 h. The chemical compositions of the silver dental amalgam alloy and the treated alloy were tested and microstructure analysis using optical and scanning electron microscopy was carried out. The phases were identified using energy disperse electron probe microanalysis. A mechanism for the mercury removal process from silver dental amalgam alloy is suggested.

scholarly journals Абляция кремния в воздухе моно- и бихроматическими импульсами лазерного излучения с длинами волн 355 и 532 nm

2022 ◽  
Vol 92 (1) ◽  
pp. 36
Author(s):  
А.Н. Чумаков ◽  
В.В. Лычковский ◽  
И.С. Никончук ◽  
А.С. Мацукович
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Material Removal ◽  
Laser Pulses ◽  
Time Interval ◽  
Silicon Sample ◽  
Laser Irradiance ◽  
Video Registration ◽  
532 Nm ◽  
Scanning Electron

Ablation of silicon sample in air under irradiance of single and double laser pulses with wavelengths 355 and 532 nm was studied by means of optical and scanning electron microscopy, raman spectroscopy, profilometry of laser craters as well as video registration of plasma’s plume radiation in time. Dependence of specific sample’s material removal on laser fluence and time interval between coupled pulses of bichromatic laser irradiance was established. Spallation of silicon was found in broad range of irradiance parameters and parameters of craters formed by ablation and spallation under the action of bichromatic laser radiation were determined.

Sign in / Sign up

Export Citation Format

Share Document