Experimental Investigations of Mechanical Characteristics and Tribological Mechanisms of Nanometric Zirconia Dental Ceramics

Li, Changhe

doi:10.2174/1874088x01105010178

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…The convection current and radiation on the surface in touch with the air are ignored and only the heat conduction on the contact surface between the molten drop and matrix and the heat conduction in the molten drop and matrix respectively are considered [16][17][18][19].…”

Section: Thermal Transmission Modelmentioning

confidence: 99%

Arc Spraying 3Cr13 Molten Drop Impact Stress Numerical Analysis

Li¹,

Wang²,

Zhao³

et al. 2013

TOMSJ

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Abstract:In the thermal spraying process, the process for the molten metal particles to hit against matrix to form coating experiences great change temperature. Since the coating materials has different thermal physical properties with the matrix materials, the residual stress is surely left in the coating. Much bigger residual stress not only restricts coating thickness but also primarily affects coating binding strength. Having analyzed reason for residual stress in the thermal spraying coating and matrix, the theoretical model of arc spraying 3Cr13 molten drop impact stress is built and numerical simulation is done for this theoretical model. The result indicates that: the faster the molten drop speed is, the greater the pressure that matrix produces. When the molten drop's collision speed is 100m/s, it is not obvious for the matrix's pressure stress and when the collision speed is increased to 200m/s, the pressure stress produced in the matrix can maximize 5500Mpa; the faster the molten drop's collision speed is, the higher extent the molten drop's flattening is, which is more beneficial to increase coating's bonding strength. The radius for the molten drop in the radius of 35 m becomes 80~110 m after collision and the flat ratio of the molten drop particle is about 3. The theoretical analysis is consistent with the experiment result.

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Section: Thermal Transmission Modelmentioning

confidence: 99%

Arc Spraying 3Cr13 Molten Drop Impact Stress Numerical Analysis

Li¹,

Wang²,

Zhao³

et al. 2013

TOMSJ

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show abstract

“…The development of industrial technologies has led to the extensive use of ceramic materials with high strength, high hardness, high chemical stability, low thermal expansion coefficient, and abrasion resistance in the fields of machinery, metallurgy, chemical industry, energy, and bio-engineering (Li et al, 2011c). The reason is the special physical and chemical properties of these ceramic materials that make them difficult to process.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the grinding temperature field of nano-ZrO<SUB align="right">2 dental ceramics with a nanoparticle jet of MQL

Wang

Jia

et al. 2014

IJCMSSE

Self Cite

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Abstract:The heat-transfer model of a surface grinding temperature field with a nanoparticle jet flow of minimum quantity lubrication (MQL), as well as the proportionality coefficient model of the energy input workpiece, was established. Numerical simulation of the surface grinding temperature field of a nano-ZrO 2 dental ceramic workpiece material was conducted. With increased cut depth, the peak values of grinding temperature rocketed. With increased workpiece feed speed, grinding temperature on the finished surface decreased. With increased wheel peripheral speed, a high amount of heat energy accumulated on the surface because of the low heat-transfer coefficient of the ceramic material, and a large temperature gradient appeared in the temperature distribution layer. Under the same cooling and lubrication conditions, grinding temperature insignificantly changed along the direction of grinding width. Conversely, under different cooling conditions, the temperature variation was significant. MQL grinding conditions with additive nanoparticles significantly affected the weakening of temperature effect on the grinding zone.Keywords: grinding; temperature field; nano-ZrO 2 dental ceramics; nanoparticle jet; minimum quantity lubrication; MQL.Reference to this paper should be made as follows: Wang, S., Li, C., Jia, D. Biographical notes: Sheng Wang is a graduate student at the School of Mechanical Engineering of Qingdao Technological University. His interest lies in grinding and abrasive finishing, specifically, minimum quantity lubrication (MQL) grinding, computer numerical-control grinding, superabrasive grinding wheels, and simulation of grinding processes.Changhe Li was awarded a PhD from the Northeastern University, China, in 2006. He is currently a Professor at the School of Mechanical Engineering of Qingdao Technological University. His research interests include computer applications in the study of surface finish mechanism; materials removal rate; abrasive finishing; quick-point grinding; surface roughness and integrity; CNC 14 S. Wang et al.grinding; superabrasive grinding wheels; grinding temperature field modelling; simulation of grinding processes; minimum quantity lubrication (MQL) grinding and high speed machining. Dongzhou Jia is a graduate student at the School of Mechanical Engineering of Qingdao Technological University. His interest lies in grinding and abrasive finishing, specifically, minimum quantity lubrication (MQL) grinding, computer numerical-control grinding, superabrasive grinding wheels, and simulation of grinding processes.Yali Hou is an Engineer at the School of Mechanical Engineering of Qingdao Technological University. She is interested in advanced manufacturing technology and auto-control, specifically, minimum quantity lubrication (MQL) grinding, abrasive finishing, computer numerical-control grinding, superabrasive grinding wheels, simulation of grinding processes, and highspeed machining.

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“…Furthermore, they measured the grinding force, surface roughness, the temperature of the grinding zone, and grinding ratio. Results showed that the cooling effect of the water droplets processing liquid attached by minimum quantity oil film as inferior to traditional processing liquid such as emulsion solution and soluble concentrates, yet presenting sound lubricating property [20][21][22][23]. It also presented excellent advantages in regard of processing precision and the grinding wheel life.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Numerical Simulation of the Grinding Temperature Field with Nanoparticle Jet of MQL

Wang

et al. 2013

Advances in Mechanical Engineering

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In this research, the heat transfer model of surface grinding temperature field with nanoparticle jet flow of MQL as well as the proportionality coefficient model of energy input workpiece was established, respectively. The numerical simulation of surface grinding temperature field of three workpiece materials was conducted. The results present that, in the workpiece, the surface temperature was significantly higher than the subsurface temperature, presenting relatively large temperature gradient along the direction of workpiece thickness. The impact of the grinding depth on grinding temperature was significant. With the increase of the cut depth, peak values of the grinding temperature rocketed. Distribution rules of the temperature field of 2Cr13 in four cooling and lubrication approaches were the same. Based on the excellent heat transfer property of nanofluids, the output heat through the grinding medium acquired an increasingly high proportion, leading to the drop of the temperature in the grinding zone. For the same cooling and lubrication conditions, grinding temperature presented insignificant changes along the direction of grinding width. Yet, under different cooling conditions, the temperature variation was significant. MQL grinding conditions with additive nanoparticles demonstrated great impact on the weakening of temperature effect on the grinding zone.

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Experimental Investigations of Mechanical Characteristics and Tribological Mechanisms of Nanometric Zirconia Dental Ceramics

Cited by 8 publications

References 9 publications

Arc Spraying 3Cr13 Molten Drop Impact Stress Numerical Analysis

Arc Spraying 3Cr13 Molten Drop Impact Stress Numerical Analysis

Investigation on the grinding temperature field of nano-ZrO<SUB align="right">2 dental ceramics with a nanoparticle jet of MQL

Modeling and Numerical Simulation of the Grinding Temperature Field with Nanoparticle Jet of MQL

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