Surface characterization of zirconia ceramics in ultrasonic vibration-assisted grinding

2018 ◽  
Vol 40 (8) ◽  
Author(s):  
Zhihua Li ◽  
Kan Zheng ◽  
Wenhe Liao ◽  
Xingzhi Xiao
Keyword(s):  
Ultrasonic Vibration ◽  
Surface Characterization ◽  
Zirconia Ceramics ◽  
Ultrasonic Vibration Assisted Grinding

Tribological properties of surface topography in ultrasonic vibration-assisted grinding of zirconia ceramics

2017 ◽  
Vol 232 (22) ◽  
pp. 4203-4215
Author(s):  
Zhihua Li ◽  
Kan Zheng ◽  
Wenhe Liao ◽  
Xingzhi Xiao
Keyword(s):  
Friction Coefficient ◽  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Tribological Properties ◽  
Vibration Amplitude ◽  
Spindle Speed ◽  
Zirconia Ceramics ◽  
Significant Difference ◽  
Vibration Parameters ◽  
Ultrasonic Vibration Assisted Grinding

In order to clarify the friction phenomenon of zirconia ceramics in the dental prosthodontics, tribological properties of surface topography in ultrasonic vibration-assisted grinding (UVAG) are studied in this work. The mechanism of material removal is researched to introduce the discontinuous grooves in UVAG theoretically. The UVAG experiments are conducted on zirconia ceramics. Through investigating and comparing experimental results, it is found that UVAG surface has better tribological properties compared with diamond grinding surface. 3D surface roughnesses of UVAG surface are improved when suitable spindle speed, large feed, small cutting depth, and large vibration amplitude are adopted. Surface topography in UVAG changes from thorn scaly to discontinuous shallow furrow when feed increases and spindle speed decreases. The discontinuous grooves are most apparent when vibration amplitude is maximum. Furthermore, the friction coefficient is experimentally studied. The results indicate that there is no significant difference among all the friction coefficients in UVAG. Proper cutting and vibration parameters can improve the average friction coefficient.

Investigation on feed direction cutting force in ultrasonic vibration-assisted grinding of dental ceramics

2016 ◽  
Vol 231 (19) ◽  
pp. 3493-3503 ◽  
Author(s):  
Heng Meng ◽  
Kan Zheng ◽  
Xingzhi Xiao ◽  
Wenhe Liao
Keyword(s):  
Mathematical Model ◽  
Cutting Force ◽  
Ultrasonic Vibration ◽  
Abrasive Particle ◽  
Force Model ◽  
Zirconia Ceramics ◽  
Feed Direction ◽  
Input Variables ◽  
The Mathematical Model ◽  
Ultrasonic Vibration Assisted Grinding

The feasibility of ultrasonic vibration-assisted grinding in dental restoration has been preliminarily proved. Improving the machining quality of zirconia ceramics by controlling cutting force is the focus of the researchers. However, the existing feed direction cutting force model for ultrasonic vibration-assisted grinding does not take the ultrasonic vibration amplitude and frequency into account. This paper presents a mathematical model for feed direction cutting force in ultrasonic vibration-assisted grinding of zirconia under the consideration of amplitude and frequency, and assuming that brittle fracture is the primary mechanism of material removal in ultrasonic vibration-assisted grinding of zirconia. The effects of amplitude and frequency on the motion, effective cutting distance, and theoretical removal of an abrasive particle have been analyzed. Besides, the number of active abrasive particles is calculated with analyzing the influences of lateral cracks and ultrasonic vibration. The variation laws of cutting force and penetration depth of an abrasive particle during ultrasonic vibration-assisted grinding have also been analyzed. Therefore, the relationship between feed direction cutting force and input variables is predicted through the developed model. Finally, pilot experiments are conducted for the mathematical model verification. Experimental results show that the trends of input variables for feed direction cutting force agree well with the trends of the developed cutting force model. Hence, the mathematical model can be applied to evaluate the feed direction cutting force in ultrasonic vibration-assisted grinding of zirconia ceramics.

Ultrasonic Vibration Assisted Grinding of Sintered Dental Zirconia Ceramics: An Experimental Study on Surface Roughness

2014 ◽  
Vol 1017 ◽  
pp. 800-805 ◽  
Author(s):  
Song Dong ◽  
Kan Zheng ◽  
Xing Zhi Xiao
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Vibration ◽  
Spindle Speed ◽  
Machining Process ◽  
Zirconia Ceramics ◽  
Cutting Depth ◽  
Hard And Brittle Materials ◽  
Input Variables ◽  
Dental Zirconia Ceramics ◽  
Ultrasonic Vibration Assisted Grinding

Dental zirconia ceramics have been widely used in dental restorations due to their superior aesthetical and mechanical properties. Ultrasonic vibration assisted grinding (UVAG), as a novel effective machining process for hard and brittle materials, is introduced into directly machining sintered dental zirconia ceramics. This study is dedicated to investigating the influence of input variables (spindle speed, feedrate and cutting depth) on surface roughness during UVAG of sintered dental zirconia ceramics. The experiment is conducted through single-factor method, and the experimental results are statistically analyzed by One-Way ANOVA. Besides, the influence tendency of input variables on surface roughness is also obtained. The results indicate that the influence of spindle speed on surface roughness is highly significant. The value of surface roughness rises with the increase of spindle speed, feedrate, and cutting depth. Therefore, a better surface quality will be achieved with the combination of lower spindle speed, cutting depth and feedrate.

Characterization of Diamond Electrodeposited Tool for Vibration Assisted Grinding Diagnostic

2014 ◽  
Vol 980 ◽  
pp. 203-207
Author(s):  
Mohd Fauzi Ismail
Keyword(s):  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Causal Analysis ◽  
High Magnification ◽  
Optimum Size ◽  
Constant Condition ◽  
Work Surface ◽  
Working Surface ◽  
Ultrasonic Vibration Assisted Grinding

Causal analysis of diamond electrodeposited tools surface topography to the variation of grinding results is required to clarify the variations in grinding results of its application in ultrasonic vibration assisted grinding (UVAG) for steel mirror finishing. On the other hands, reference datum as defined by existing surface topography standard is not suitable and may lead to fruitless conclusion in relation to the DET characterization. This study aims to characterize the DET surface topography in relation to its performance in UVAG for steel mirror finishing. In this paper, samples of DET tool-work pairs are obtained from constant condition UVAG grinding test. The whole surface of DET surface topography is captured in one measurement using con-focal laser microscope and stitching toolbox. Surface Reversal Method is proposed to obtain the reference datum for the identification of active grains (diamond grains which actually involved in the grinding) on the DET working surface based on the most protruded grains from the surface. Based on the protrusion depth, this study found that only small number of grains can be considered as active grains. Then, each DET is characterized based on the distance of active grain to the tool rotational centre (active grain locus Rg). As a result, it is clarified that there is a non-linear relationship between the active grain locus Rg and work surface roughness Sq. There is an optimum size of active grain locus Rg for current grinding condition and for larger or smaller Rg, higher work roughness Sq is observed. Additionally, observation using high magnification white light interferometer on the work surface topography for each sample showed the existence of ultrasonic vibration marks with the marks wavelength consistence to the size of active grain locus Rg of the DET, which also validates the methodology used for DET characterization.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Surface Characterization of Functionalized Imidazolium-Based Ionic Liquids

Langmuir ◽  
2008 ◽  
Vol 24 (17) ◽  
pp. 9500-9507 ◽  
Author(s):  
Claudia Kolbeck ◽  
Manuela Killian ◽  
Florian Maier ◽  
Natalia Paape ◽  
Peter Wasserscheid ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Surface Characterization
Sign in / Sign up

Export Citation Format

Share Document