Tribological properties of plasma sprayed zircon-alumina powder mixture with and without laser re-melting

Hazra, S.; Bandyopadhyay, P.P.

doi:10.1080/00202967.2020.1757309

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Alumina and zircon (ZrSiO4) are extensively used as initial powders for being inexpensive raw materials [4]. The molar ratio 3:2 (alumina:zircon) is commonly used [1,[5][6][7][8] for being the stoichiometric proportion for the formation of zirconia and mullite, as described in the following equation [6,[9][10][11]. This reaction starts above 1400 ºC [12] and 1600 ºC may be required to complete it [1,6].…”

Section: Introductionmentioning

confidence: 99%

Digital light processing additive manufacturing of in situ mullite-zirconia composites

Camargo¹,

Erbereli²,

Lovo³

et al. 2022

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Digital light processing additive manufacturing of in situ mullite-zirconia composites

Camargo¹,

Erbereli²,

Lovo³

et al. 2022

Journal of the European Ceramic Society

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“…Alumina and zircon (ZrSiO4) are extensively used as initial powders for being inexpensive raw materials [243]. The molar ratio 3:2 (alumina:zircon) is commonly used [240,[244][245][246][247] for being the stoichiometric proportion for the formation of zirconia and mullite, as described in Equation 6 [245,[248][249][250]. This reaction starts above 1400 ºC [251] and 1600 ºC may be required to complete it [240,245].…”

Section: Ceramic Powdersmentioning

confidence: 99%

Additive manufacturing of advanced ceramics by digital light processing: equipment, slurry, and 3D printing

Camargo¹

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Additive manufacturing (AM) or 3D printing is a set of technologies that fabricate parts by successively adding layers. This technique is already applied in all classes of materials. In ceramic manufacturing, AM allows the fabrication of small series components with greater geometric freedom, lower cost, and reduced delivery time. Among the AM technologies, vat photopolymerization (VP) stands out for its ability to produce ceramic pieces with excellent dimensional accuracy and surface finish. However, there is a shortage of VP commercial equipment dedicated to producing ceramics at an affordable price, given the challenges of dealing with raw material with high particle loading. In this work, which approaches the fabrication of advanced ceramics by digital light processing VP, the feasibility of using a topdown 3D printer prototype and an ordinary commercial bottom-up printer (usually applied in polymer 3D printing) in the processing of ceramic materials was tested. For this, a 3D printer prototype was designed and built, creating an innovative recoating system (patent pending), composed of two blades with distinct and sequential functions. This system aims to overcome the challenge of creating layers for ceramic suspensions, which usually have high viscosity. In addition, photosensitive suspensions were developed seeking to meet process requirements related to high ceramic loading, rheological behavior, photosensitive parameters, and stability.The ceramic powders were selected to evaluate the process using distinct groups of advanced ceramics: nanometric powders (3Y-TZP) and submicrometric powders (electrofused mullite).Furthermore, a combination of natural raw material (zircon) with alumina was used to investigate the in-situ formation of mullite-zirconia composites in 3D printed parts. Thus, photosensitive ceramic suspensions based on a nanometric zirconia powder (3Y-TZP) were developed and characterized, selecting the appropriate components (monomer, photoinitiator, and dispersant). In this way, a ceramic slurry was obtained capable of validating the developed prototype and manufacturing green ceramic bodies. Nonetheless, the same formulation was not suitable for the commercial 3D printer, due to its rheological behavior not being compatible with the equipment. On the other hand, the submicrometric mullite powder allowed the preparation of formulations with high solid loading (up to 50 vol%). These new formulations were successfully used in both pieces of equipment tested. Furthermore, the formulation based on the mixture of ceramic powders (zircon and alumina) showed that the technique can be combined with reactive sintering to create in-situ mullite and zirconia composites. After analysis of the thermal decomposition, a protocol for the thermal treatment was created and the printed bodies were submitted to burning of the organic components and sintering. Both 3D printers tested proved capable of creating dense ceramic pieces (>95%) and with geometries that would be unfeasible or even impossible by other man...

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Investigation on the Surface Structure and Tribological Characterization of 10 wt.% ZrO 2 -Reinforced Alumina Prepared by Flame Spray Coating

Younes,

Baiamonte,

Idir

et al. 2024

SAE Int. J. Mater. Manf.

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<div>In this study, we have investigated the microstructural characteristics, the mechanical properties, and the dry sliding wear behavior of a ceramic coating consisting of zirconia (ZrO2) and alumina (Al2O3) deposited by flame spraying. A series of wear tests were carried out under a variety of loads and at two different sliding speeds. The evaluation included an examination of the coating microstructure, microhardness, coefficient of friction (COF), and wear resistance of the flame-sprayed coating. The results showed that the coatings had a perfectly structured micro-architecture and were metallurgically bonded to the substrate. The Al2O3 coating exhibited a fine granular structure with pores and oxides. The microstructure of Al2O3-10 wt.% ZrO2, on the other hand, showed a blocky structure with a uniform distribution of ZrO2 inclusions in the composite coating. X-ray diffraction (XDR) results showed that the phases in both coatings were predominantly α-Al2O3 with a minor presence of γ-Al2O3. However, in addition to residual ZrO2 in the tetragonal phase, the ZrO2-Al2O3 coating showed a predominance of ZrO2 in the monoclinic structure. To elucidate the intricacies of the wear mechanism and the characteristics of the wear debris, a comprehensive analysis of the wear performance of flame-sprayed ceramic coatings was carried out.</div>

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Tribological properties of plasma sprayed zircon-alumina powder mixture with and without laser re-melting

Cited by 3 publications

References 24 publications

Digital light processing additive manufacturing of in situ mullite-zirconia composites

Digital light processing additive manufacturing of in situ mullite-zirconia composites

Additive manufacturing of advanced ceramics by digital light processing: equipment, slurry, and 3D printing

Investigation on the Surface Structure and Tribological Characterization of 10 wt.% ZrO <sub>2</sub> -Reinforced Alumina Prepared by Flame Spray Coating

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