Shrinkage characteristics studies on conventional sintered zirconia toughened alumina using computed tomography imaging technique

Elsen, S. Renold; Ramesh, T.

doi:10.1016/j.ijrmhm.2015.09.008

Cited by 13 publications

(6 citation statements)

References 36 publications

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“…In the field of ceramic materials, XCT have been particularly used for structural or damage characterization of ceramic matrix composites [38][39][40][41][42][43] and to evaluate pore morphology and interconnectivity of porous or cellular ceramics [44][45][46][47][48][49][50]. XCT analysis was also applied to follow the microstructural evolutions during the compaction process of [51] or their sintering [52][53][54], and to investigate indentation induced cracking in dense alumina [55]. Pecanac et al [56] used computed tomography data for numerical simulation of the mechanical behavior and strength prediction of tubular porous ceramics containing large defects.…”

Section: Introductionmentioning

confidence: 99%

X-ray tomography of additive-manufactured zirconia: Processing defects – Strength relations

Saâdaoui

Khaldoun

Adrien

et al. 2020

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

X-ray tomography of additive-manufactured zirconia: Processing defects – Strength relations

Saâdaoui

Khaldoun

Adrien

et al. 2020

Journal of the European Ceramic Society

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“…The greatest shrinkage was recorded at 5.6% during sintering trial 9 and sintering trial 3. It can be seen that the samples' thickness (Z-axis) had more shrinkage than their lengths (X-Y axis) at lower sintering temperatures of 1200 • C and 1300 • C. On the other hand, the length (diameter) had more shrinkage, up to 5.6%, when the temperature increased to 1400 • C. The results from this experiment suggest that the shrinkage rate for the round sample demonstrated nonlinear behaviour probably due to the nonuniform heat transfer or nonuniformity in the local packing density of the particles [20].…”

Section: Before Sinteringmentioning

confidence: 70%

“…On the other hand, the length (diameter) had more shrinkage, up to 5. when the temperature increased to 1400 °C . The results from this experiment suggest t the shrinkage rate for the round sample demonstrated nonlinear behaviour probably to the nonuniform heat transfer or nonuniformity in the local packing density of the p ticles [20]. Figure 6 presents a more in-depth examination of the microstructure of the sintered alumina.…”

Section: Before Sinteringmentioning

confidence: 90%

Effect of Sintering Parameters on the Mechanical Properties and Wear Performance of Alumina Inserts

et al. 2022

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The sintering temperature and holding time have a significant impact on the densification of a ceramic compact. In this study, alumina inserts were made with varying sintering temperatures and holding times. The procedure began with the compacting of alumina powders inside a mould with trapezium and round shapes. These inserts were then sintered between 1200 °C and 1400 °C for 5 to 9 h holding time. The sintered samples underwent analysis based on the shrinkage size, density, and microstructure. The sample with the highest density was chosen for additional machining tests. The results showed that the alumina shrinkage ranged from 3 to 6%, with a maximum relative density of 91.3% recorded when the sintering parameter was applied at 1400 °C and a 9 h holding time. The transition of the grain growth was observed depending on the sintering temperature and heating duration. When machined with AISI 1045 carbon steel, the sintered alumina inserts achieved a maximum tool life of 35 s at a cutting speed of 350 m/min. The sintered inserts exhibited brittle characteristics with a dominant notch wear and abrasive mechanisms.

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“…The addition of Cr 2 O 3 is seen to help overcome excessive shrinkage; however, the use of ZrO 2 based on percentage impacts the shrinkage. Shrinkage cannot be avoided because ZrO 2 blocks vary when sintered; the higher the ZrO 2 percentage, the higher the percentage of shrinkage that will occur [25]. where the shrinkage is very significant with each addition of wt% ZrO 2 .…”

Section: Agglomerationmentioning

confidence: 99%

Reducing The Risk of Agglomeration and Shrinkage Ceramic Body from Al2O3-ZrO2 Composition

Tamin

2023

JMechE

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This study introduces the effect of ceramic composition that consists of Alumina (Al2O3)-Zirconia (ZrO2)-Chromia (Cr2O3) compositions on agglomerate and shrinkage for cutting tool development. Shrinkage is a problem in the development of ceramic cutting tools other than the occurrence of particle agglomerate on the body structure. Finer grain size significantly contributes to the ceramic body's shrinkage and agglomeration. This study analyzed grain size and its relationship with shrinkage and agglomerates. The powders were ball-milled with 80 wt% Al2O3 -20 wt% ZrO2 -0.6 wt% Cr2O3 and then compacted and sintered at 1400 °C to examine their shrinkage and investigate microstructure by scanning electron microscopy (SEM) machine. The results show that ZrO2 has a larger particle size of 6.10 μm and Cr2O3 has a finer measure of 1.24 μm. When blended with the ball mill, the mix of Al2O3- ZrO2-Cr2O3 was obtained is 7.30 μm, showing that the ball mill can uniformly mix all the particles and reduce the risk of agglomeration. The microstructural analysis found that Cr2O3 covers and fills up the space between Al2O3 and ZrO2 compared to without Cr2O3. The combination of agglomerate and shrinkage of Al2O3-ZrO2-Cr2O3 was responsible for the performance of the ceramic cutting tool fabricated.

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Shrinkage characteristics studies on conventional sintered zirconia toughened alumina using computed tomography imaging technique

Cited by 13 publications

References 36 publications

X-ray tomography of additive-manufactured zirconia: Processing defects – Strength relations

X-ray tomography of additive-manufactured zirconia: Processing defects – Strength relations

Effect of Sintering Parameters on the Mechanical Properties and Wear Performance of Alumina Inserts

Reducing The Risk of Agglomeration and Shrinkage Ceramic Body from Al2O3-ZrO2 Composition

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