Optimization of pH and dispersant amount of Y-TZP suspension for colloidal stability

Chin, C. H.; Muchtar, Andanastuti; Azhari, Che Husna; Razali, Masfueh; Aboras, Mohamed

doi:10.1016/j.ceramint.2015.04.073

Cited by 33 publications

(19 citation statements)

References 30 publications

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“…The pH of the Y-TZP suspension was then adjusted to pH2 with HNO 3 solution. The PEI amount and pH value in this study were optimized based on the results of a previous study (Chin et al 2015). The suspension was thoroughly stirred with a magnetic stirrer for 45 min and then placed in an ultrasonic bath for 15 min to break soft agglomerates.…”

Section: Methodsmentioning

confidence: 99%

“…For example, Trunec and Pouchly (2016) successfully dispersed Y-TZP nanoparticles via colloidal processing, followed by osmotic dehydration, thus producing a compact and fine microstructure in the specimens from the dispersed powder after sintering. Amat et al (2014) and Chin et al (2015) electrosterically stabilized a Y-TZP suspension by adding a polyelectrolyte, obtaining a stable Y-TZP suspension. Both studies achieved excellent mechanical properties and desired microstructure in the Y-TZP specimens.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Colloidal Stability in Colloidal Processing for Highly Translucent, Nanosized Zirconia

Chin

Muchtar²,

Azhari³

et al. 2018

JSM

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This study aimed to improve the colloidal stability of yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) suspension through colloidal processing to obtain highly translucent Y-TZP. Agglomeration is often the main complication in the processing of nanosized Y-TZP as it deteriorates mechanical and optical properties. Thus, colloidal processing is necessary to mitigate the agglomeration in Y-TZP. The colloidal stability of Y-TZP suspension plays a key role for the success of colloidal processing. In this study, colloidal processing was conducted at several stages, namely, dispersant addition, pH adjustment and sedimentation. Changes in particle size and zeta potential at various stages were recorded. The suspensions were then slip-casted to form green bodies. Green bodies were sintered and characterized for density and translucency. The results showed that dispersant addition followed by pH adjustment effectively dispersed soft agglomerates by introducing electrosteric stabilization, whereas sedimentation successfully segregated hard agglomerates and contributed excellent colloidal stability. With high colloidal stability, the translucency of Y-TZP was improved by approximately 30%. This study demonstrated different colloidal processing stages and proved that high colloidal stability and fine particle size are vital to produce highly translucent Y-TZP.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of Colloidal Stability in Colloidal Processing for Highly Translucent, Nanosized Zirconia

Chin

Muchtar²,

Azhari³

et al. 2018

JSM

Self Cite

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“…The samples fabricated by CIP and the combined method achieved full densification (> 98 %). The full densification of grains has been proven in many studies [18,20] to yield high mechanical properties in Y-TZP. This result can be attributed to the high powder packing factor of the green bodies.…”

Section: Sintered Densitymentioning

confidence: 99%

“…Chin et al [20] reported a smaller average grain size of 486 nm in the Y-TZP sample fabricated via slip casting method and a hardness of 10 GPa. In the present study, a higher hardness value was achieved with the combined method of slip casting and CIP (hardness test results will be discussed in following section) although the average grain size is larger compared to that of Chin et al [20]. This is attributed to the compact microstructure with extremely low porosity yielded via the combined method in this study.…”

Section: Morphological Analysismentioning

confidence: 99%

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Fabrication of Y-TZP for Dental Crowns Applications by Combining Slip Casting and Cold Isostatic Pressing

Hao

Muchtar²,

Azhari³

et al. 2016

MJAS

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Yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) is a popular material for dental restoration because of its outstanding mechanical properties and biocompatibility. Cold isostatic pressing (CIP) and slip casting are among several consolidation methods for Y-TZP. These methods produce Y-TZP with high mechanical properties. This study aims to enhance the mechanical properties of Y-TZP by combining slip casting and CIP. Y-TZP samples were fabricated using CIP, slip casting, and their combination. Subsequently, the green bodies of the samples were sintered at 1600 °C. Their mechanical properties (density and hardness) were tested and their microstructures were scrutinized under a scanning electron microscope. Compared with the other two methods, the combined method significantly improved the mechanical properties of Y-TZP. In addition, the combined method also produced a compact and homogeneous microstructure. Therefore, the combination of slip casting and CIP is recommended in the production of Y-TZP with high mechanical properties for dental crown applications.Keywords: cold isostatic pressing, slip casting, colloidal processing Abstrak Polikristal tetragon zirkonia yang distabilkan dengan yttria (Y-TZP) merupakan bahan restorasi pergigian yang popular disebabkan sifat mekanik dan bioserasi yang baik. Kaedah penekanan isostatik sejuk (CIP) dan penuangan buburan adalah kaedah pengukuhan yang lazim digunakan untuk Y-TZP. Kedua-dua kaedah ini berupaya menghasilkan Y-TZP yang bersifat mekanik tinggi. Kajian ini bertujuan meningkatkan sifat mekanik Y-TZP melalui gabungan penuangan buburan dan CIP. Sampel Y-TZP dihasilkan melalui kaedah penuangan buburan, CIP dan gabungan kedua-dua kaedah tersebut. Seterusnya, jasad anum yang terhasil disinter pada suhu 1600 ˚C. Sifat mekanik sampel Y-TZP (ketumpatan dan kekerasan) diuji dan mikrostruktur juga diteliti di bawah mikroskop elektron imbasan. Kaedah gabungan didapati meningkatkan sifat mekanik Y-TZP dengan ketara. Selain itu, mikrostruktur yang padat dan homogen juga diperolehi. Justeru, gabungan kaedah penuangan buburan dan CIP dicadangkan untuk penghasilan Y-TZP yang bersifat mekanik tinggi dalam aplikasi korona gigi.Kata kunci: penekanan isostatik sejuk, penuangan buburan, pemprosesan berkoloid

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Optimizing of the Colloidal Dispersity of Silica Nanoparticle Slurries for Chemical Mechanical Polishing

Zeng

Zhao

Liu

et al. 2021

Silicon

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Optimization of pH and dispersant amount of Y-TZP suspension for colloidal stability

Cited by 33 publications

References 30 publications

Improvement of Colloidal Stability in Colloidal Processing for Highly Translucent, Nanosized Zirconia

Improvement of Colloidal Stability in Colloidal Processing for Highly Translucent, Nanosized Zirconia

Fabrication of Y-TZP for Dental Crowns Applications by Combining Slip Casting and Cold Isostatic Pressing

Optimizing of the Colloidal Dispersity of Silica Nanoparticle Slurries for Chemical Mechanical Polishing

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