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RISS 인기검색어
- 검색키워드
- 저자 : W.D. Teng (검색결과 5 건)
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C.H. Ting,S. Ramesh,C.Y. Tan,N.I. Zainal Abidin,W.D. Teng,I. Urriés,L.T. Bang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.8
In the present work, the effect of low temperature sintering, focusing on varying the sintering holding times on the mechanicalproperties, microstructure and low temperature degradation behavior of undoped and MnO2-doped Y-TZP ceramics wereinvestigated. Green samples were sintered at temperatures ranging from 1100 to 1250 oC at varying holding times rangingfrom 12 min. to 480 min. The sintered bodies were characterized in terms of bulk density, Vickers hardness, fracturetoughness, phase stability and grain size. The results indicated that the relative density of above 95%, Vickers hardness of 14GPa and fracture toughness of 5 MPam1/2 were obtained when sintered at lower sintering temperature (below 1250 oC) andlonger sintering times for MnO2-doped Y-TZP samples. Grain growth was marginal and the average grain size of all samplesranged between 0.14 and 0.28 µm. The results indicated that the grain growth kinetics was influenced mainly by the sinteringtemperature and not by the sintering holding time. The addition of MnO2 was found to be beneficial in enhancing densificationand mechanical properties of Y-TZP particularly at low sintering temperature of 1100 oC and low holding time of 12 min. Thelow-temperature degradation experiment conducted in superheated steam indicated that all the samples did not transformedto the monoclinic symmetry, attributed mainly to the lower grain size sintered at relatively low sintering temperatures
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Sintering behavior and characteristic of bio-based hydroxyapatite coating deposited on titanium
M. A. Roudan,S. Ramesh,Y.H. Wong,H. Chandran,S. Krishnasamy,W.D. Teng,L.T. Bang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9
Deposition of hydroxyapatite derived from bio-waste eggshell on titanium substrate via electrophoretic deposition method andthe thermal stability of the resulting coating were investigated. The coated substrates was sintered at different temperatures ranging from 900 oC to 1100 oC in argon atmosphere prior to characterisation. The results indicated that a crack-free HA coating layer having an average thickness of 20 µm was successfully deposited at the optimum temperature of 1050 oC. The XRD analysis indicated that the sintered coated substrates was fully HA phase and was stable up to 1050 oC, with Ca/P ratioof 1.67. The SEM results showed that good bonding was achieved between the HA coating and the Ti substrate. There was also no secondary phase formation at the joint interface. This study demonstrate the viability of using electrophoretic deposition method to coat a thin layer of bio-based HA onto titanium without disrupting the biocompatibility nature of the HA phase.
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S.M. Kwa,S. Ramesh,L.T. Bang,Y.H. Wong,W.J. Kelvin Chew,C.Y. Tan,J. Purbolaksono,H. Misran,W.D. Teng 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.2
The sintering of yttria-tetragonal zirconia polycrystals (Y-TZP) is commonly carried at a predefined temperature using a long holding time of 2 hours. This often has resulted in grain coarsening which affects the mechanical properties of the sintered body and low temperature degradation (LTD) behaviour of the ceramic when exposed to moist environment. In this research, the effect of using a short holding time of 1 min. during sintering coupled with small amounts (0.5 and 1 wt%) of manganese oxide, MnO2 as dopant on the mechanical properties and LTD behaviour of 3 mol% Y-TZP were investigated. The results showed that the mechanical properties improved significantly with the addition of 0.5 wt% MnO2 for the 1-min. and 12-min. holding time samples when compared to 2 hours holding time sintered at the same temperature of 1350 ℃. Nevertheless, regardless of the holding time employed, the 1 wt% MnO2 addition was not effective in improving the mechanical properties and ageing resistance of Y-TZP ceramic.
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Effect of annealing treatment on the characteristics of bovine bone
A. Niakan,S. Ramesh,C.Y. Tan,J. Purbolaksono,Hari Chandran,W.D. Teng 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.2
The effect of annealing on the properties of bovine bone was investigated over the temperature range of 400 ℃ to 1300 ℃ at a ramp rate of 10 ℃/minute. The XRD results indicated that annealing at between 600 ℃ and 1100 ℃ resulted in phase pure hydroxyapatite (HA). However, decomposition of HA to form tri-calcium phosphate was observed for samples annealed above 1000 ℃. Thermo-gram analysis of bovine bone revealed the existence of organic combinations that was completely removed from the structure during heat treatment above 600 ℃. Annealed bovine bone between 800 ℃-1000 ℃ exhibited features of interconnecting pore structure, suitable for biomedical application. The study revealed that proper heat treatment through the control of annealing temperature represent a viable method to produce a HA structure from bovine bone.
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Properties of hydroxyapatite synthesize by wet chemical method
S. Ramesh,S. Adzila,C.K.L. Jeffrey,C.Y. Tan,J. Purbolaksono,A.M. Noor,M.A. Hassan,I. Sopyan,W.D. Teng 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
The sintering behavior of a commercial HA and synthesized HA was investigated over the temperature range of 700 o C to 1400 o C in terms of phase stability, bulk density, Young’s modulus and Vickers hardness. In the present research, a wet chemical precipitation reaction was successfully employed to synthesize a submicron, highly crystalline, high purity and single phase stoichiometric HA powder that is highly sinteractive particularly at low temperature regimes below 1100 o C. It has been revealed that the sinterability of the synthesized HA was significantly greater than that of the commercial HA. The temperature for the onset of sintering and the temperature required to achieve densities above 98% of theoretical value were approximately 150 o C lower for the synthesized HA than the equivalent commercial HA. Nevertheless, decomposition of HA phase upon sintering was not observed in the present work for both powders.
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