Impact of pressure in static and dynamic pressing of zirconia ultradisperse powders on compact density and compaction efficiency during sintering

Ghyngazov, S. A.; Frangul'yan, T. S.

doi:10.1016/j.ceramint.2017.09.042

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…The porosity as seen in Fig.2, are reduced by increasing the compaction pressure. Lower porosity should result to higher densification and the analysis of correlation between density and pressure[14,20,21]. They agreed that the reducing green body gap occurs during compaction occur linearly with increasing pressure as the intergranular-pores reduced.…”

mentioning

confidence: 92%

“…The deflection path of cracks in ceramics is caused by lattice vacancy, while compression stress cause the atoms dislocate in one direction [11]. Several studies [12][13][14] also relate the correlation between pressure load with firing shrinkage and density of the ceramic.…”

Section: Introductionmentioning

confidence: 99%

“…Current Materials Research Using X-Rays and Related Techniques III explained by other researchers [13,14]. They agreed that the increased in compaction pressure will lead to decrease in porosity of ceramic thus result in higher bulk density.…”

mentioning

confidence: 97%

“…However, the firing shrinkage for 350 MPa compaction pressure was slightly increased to 26.12%. Previous work found out that not only when pressure is higher during compaction makes the green body more densified, but also make it less compact[14]. The work emphasized that the formation of tetragonal phase to bulk chemical heterogeneity of ZrO2-Y2O3 solid-solution make the ceramic less compact, consequently result to increase in shrinkage after sintering process.…”

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confidence: 99%

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Effect of Pressure Load on the Physical Properties of ZTA-TiO2-Cr2O3

Manshor

Ali

Azhar

2022

KEM

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ZTA is considered as one of the most popular ceramic composites that are used for cutting tools due to their excellent properties. Consistent efforts should be expanded to achieve improvements in toughness and strength, and thus help them achieve a longer tool life. However, powder compaction process has been found to be a limiting factor in the production of a defect-free ceramic pellet where the green product often ruptures immediately after the compaction process or sintering process. This may be contributed by uneven distribution of pressure load, thus affecting the particles packing and properties of final product. As a solution, the present work aims to study the effect of different compaction pressure on the physical properties of ZTA-TiO2-Cr2O3 ceramic composite to establish a defect-free cutting insert. The samples were fabricated by solid state processing, subjected to pressure loads varied from 200 MPa-350MPa, followed by sintering at 1600°C for 1 hour. The sintered samples were characterized accordingly. The results showed significant enhancement in density and hardness with increasing compaction pressure from 200 MPa to 300 MPa. On the other hand, further increment of pressure deteriorates the properties of the samples. These were due to the excessive external pressure which caused a very tight compaction in the mold, resulted in elastic expansion of the compact and sliding of particles as the pressure is removed. In conclusion, ZTA-TiO2-Cr2O3 subjected to 300 MPa compaction pressure showed the most optimal properties with the highest density (4.58 g/cm3) and hardness (2001 HV).

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confidence: 92%

Section: Introductionmentioning

confidence: 99%

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confidence: 97%

mentioning

confidence: 99%

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Effect of Pressure Load on the Physical Properties of ZTA-TiO2-Cr2O3

Manshor

Ali

Azhar

2022

KEM

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“…There are numerous experimental results found in the literature for the kinetics and thermodynamics of isothermal compressibility [18][19][20], thermal shrinkage [21][22][23], and sintering [24][25][26][27]. Although there have been several mathematical modelling or computer simulations attempts, there are no studies concentrated on numerical calculations using basic thermodynamic relations.…”

Section: Introductionmentioning

confidence: 99%

Isothermal compressibility and isobaric thermal shrinkage of a porousα-alumina compact: thermodynamic calculations

2020

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Two methods were proposed to calculate the thermodynamic parameters of porous ceramic compacts depending on their molar volume change with applied pressure and heating temperature, respectively. Molar volume of the porous α-alumina (α-Al 2 O 3 ) compact was evaluated according to literature depending on both the applied pressure at room temperature and the heating temperature at atmospheric pressure. The isothermal compressibility coefficient, Gibbs energy, and work done on the compact by compression were calculated. The thermal shrinkage coefficient and activation energy as well as the change in enthalpy, entropy and Gibbs energy were calculated for partial sintering. The spontaneous nature of the treatments were discussed with respect to the obtained results.

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Effect of additives on sintering of zirconia ceramics

Ghyngazov

Shevelev

2018

J Therm Anal Calorim

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Impact of pressure in static and dynamic pressing of zirconia ultradisperse powders on compact density and compaction efficiency during sintering

Cited by 15 publications

References 16 publications

Effect of Pressure Load on the Physical Properties of ZTA-TiO<sub>2</sub>-Cr<sub>2</sub>O<sub>3</sub>

Effect of Pressure Load on the Physical Properties of ZTA-TiO<sub>2</sub>-Cr<sub>2</sub>O<sub>3</sub>

Isothermal compressibility and isobaric thermal shrinkage of a porousα-alumina compact: thermodynamic calculations

Effect of additives on sintering of zirconia ceramics

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