Effect of Sintering Profiles on the Properties and Ageing Resistance of Y-TZP Ceramic

Sivakumar, S.; Ramesh, S.; Chin, KG; Tan, C.Y.; Teng, W.D.

doi:10.15282/ijame.4.2011.3.0033

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…Firstly because it is chemically and mechanically very stable; secondly it exhibits ferroelectric properties at and above room temperature, and finally because it can be easily prepared and used in the form of ceramic polycrystalline samples. However, pure BaTiO 3 with an average grain size of around 1µm exhibits a dielectric constant of 3000-5000 at room temperature (Amarande et al, 2007;Arlt et al, 1985;Sivakumar et al, 2011;Jingkun et al, 1999). Dielectric constants as high as 5800 have also been reported (Amarande et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Effect of Ta2O5 doping on the microstructure and dielectric properties of BaTiO3 based ceramics

Mousharraf¹,

Islam²

2013

Int J Automot Mech Eng

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The main focus of the research was to correlate composition and sintering parameters with the microstructure and dielectric properties of Ta 2 O 5 doped BaTiO 3 ceramics. The samples were sintered using both single and two-stage sintering techniques. Thereafter SEM and XRD techniques were used to examine the structure of the samples with a particular focus on the incorporation of Ta 5+ ions into the BaTiO 3 crystal lattice. The SEM analysis focused on measuring the grain size and investigating the grain size distribution of the sintered samples. Finally, the dielectric properties were analysed and the relationship between the properties and structure of the doped BaTiO 3 was established. From the research it can be stated that two-stage sintering yielded the best dielectric properties. The best stable value of the room temperature dielectric constant (k) of 19000 was obtained for the 1.5 mole % Ta 2 O 5 doped BaTiO 3 sample sintered at 1320 0 C for 0hrs and 1280 0 C for 6hrs, due to the combination of a high percent theoretical density (%TD) and optimum grain size. At a temperature range of 30 0 to 60 0 C, this combination of composition and sintering parameters yielded a dielectric constant in the range of 18000-19000.

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Section: Introductionmentioning

confidence: 99%

Effect of Ta2O5 doping on the microstructure and dielectric properties of BaTiO3 based ceramics

Mousharraf¹,

Islam²

2013

Int J Automot Mech Eng

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“…Many researchers have used conventional sintering [3][4][5][6]. Newer processes exist such as plastic sintering, liquid phase sintering, spark plasma sintering and pressureless sintering [7][8][9][10]. However, microwave heating is different from all of the conventional ones in the way heat is transferred, which is by radiation and convection heating.…”

Section: Introductionmentioning

confidence: 99%

The viability of microwave sintering process to produce a ceramic tool insert

Thauri¹,

Baharudin²,

Leman³

et al. 2022

Int. J. Automot. Mech. Eng.

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Microwave processing of ceramics is fast emerging as a new field of ceramic processing and material synthesis. The past year has witnessed significant progress in the aspects of commercialization and application of the technology in new areas. Due to that reason, several experiments were conducted on microwave heating of ceramics. The aim of the study is to investigate i) whether microwave is a viable alternative to produce sintering parts, ii) the effect of soaking time on the properties of the sample, and iii) the influence of several binders including nickel, ferum, chromium and cobalt to tungsten carbide cermets. The study involved studying the density, hardness and microstructure of the sintered samples. The samples were compacted using an Instron machine at 200 MPa in a cylindrical shape using pallet press with a height of 10 mm and a diameter of 20 mm and sintered in microwave hybrid sintering at 1450°C for two different soaking time (10 min and 20 min). The soaking time of 10 min showed better density, hardness and microstructural results compared to those of 20 min. In comparing between the binders, Ni and Fe (Ni-Fe) showed better results compared to Ni and Cr. While cobalt, nickel and ferum (Co-Ni-Fe) had enhanced results compared to Co and Cr (Co-Cr). Although there are a lot of research studies on several other binders, there is still no finding on the use of microwave hybrid sintering to sinter different mixing binders of tungsten carbide cermets. Therefore, in this research, it is believed that the use of microwave hybrid sintering is viable to sinter tungsten carbide cermets with different binders. The density result showed that each composition of the sintered density was higher compared to green density, which increased by 30% than the green density on average. On the other hand, the hardness results from the commercial cutting tool for tungsten carbide cermet was in the range of 80 to 92 HRA and the highest result for hardness in this research was 84.3 HRA, which means that the insert can be used for commercial use depending on the application.

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“…Zirconia Toughened Alumina (ZTA), which primarily consist of alumina (Al2O3) as the primary phase and Yttria Tetragonal Zirconia Polycrystals (Y-TZP) as the second phase has been widely used in various applications across many industries attributed to its excellent mechanical properties [1][2][3]. The emergence of these composites was mainly driven by alumina's weaknesses, which exhibits low toughness and zirconia, which has a significant weakness known as the ageing process when exposed to humid environments.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sintering Profiles on Zirconia Toughened Alumina (ZTA) Prepared by Two-Stage Sintering

Loong¹,

Sivanesan²,

Noum³

2021

KEM

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The effects of sintering profiles on the Zirconia Toughened Alumina (ZTA) composite containing 0 vol% Y-TZP (pure alumina) to 20 vol% Y-TZP content prepared by a sintering method known as two-stage sintering were investigated. The heating rate was set between 10°C/min to 20°C/min, T1 set between 1400°C to 1500°C, T2 at 1350°C and holding time was set at 12 hours. The samples’ microstructural properties and mechanical properties, including bulk density, Vickers hardness, Young’s modulus and fracture toughness, were evaluated. Based on the data obtained, the ZTA composites with 10 vol% Y-TZP sintered at a heating rate of 10°C/min and holding time of 12 hours were able to achieve mechanical properties requirements set by the industry standard. In addition, the maximum ZTA composite’s bulk density was recorded to be above 90% T.D, while the Vickers hardness of the composite was recorded to be exceeding 17 GPa. The ZTA composite also recorded maximum Young’s modulus exceeding 380 GPa and fracture toughness above 6 MPam1/2.

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Effect of Sintering Profiles on the Properties and Ageing Resistance of Y-TZP Ceramic

Cited by 13 publications

References 18 publications

Effect of Ta2O5 doping on the microstructure and dielectric properties of BaTiO3 based ceramics

Effect of Ta2O5 doping on the microstructure and dielectric properties of BaTiO3 based ceramics

The viability of microwave sintering process to produce a ceramic tool insert

The Effect of Sintering Profiles on Zirconia Toughened Alumina (ZTA) Prepared by Two-Stage Sintering

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