Advance of Sintering Methods of High Purity Alumina Ceramics

Tian, Qing Bo; Dai, Jin Shan; Ling, Xu; Wang, Xiu Hui

doi:10.4028/www.scientific.net/kem.703.76

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…The sintering temperature is monitored by a thermocouple placed on the outer surface of the mold and via a pyrometer [ 3 , 16 ]. The main advantages of the SPS method compared to conventional sintering are the reduced sintering time and the ability to control the parameters of the sintering process and the material microstructure [ 21 , 22 ]. The use of short residence times and high heating rates prevent the excessive growth of crystallites.…”

Section: Introductionmentioning

confidence: 99%

Influence of Alumina Grade on Sintering Properties and Possible Application in Binder Jetting Additive Technology

Kwiatkowski,

Marczyk,

Putyra

et al. 2023

Materials

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Alumina is one of the most popular ceramic materials widely used in both tooling and construction applications due to its low production cost, and high properties. However, the final properties of the product depend not only on the purity of the powder, but also, e.g., on its particle size, specific surface area, and the production technology used. These parameters are particularly important in the case of choosing additive techniques for the production of details. Therefore, the article presents the results of comparing five grades of Al2O3 ceramic powder. Their specific surface area (via Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) methods), particle size distribution, and phase composition by X-ray diffraction (XRD) were determined. Moreover, the surface morphology was characterized by the scanning electron microscopy (SEM) technique. The discrepancy between generally available data and the results obtained from measurements has been indicated. Moreover, the method of spark plasma sintering (SPS), equipped with the registration system of the position of the pressing punch during the process, was used to determine the sinterability curves of each of the tested grades of Al2O3 powder. Based on the obtained results, a significant influence of the specific surface area, particle size, and the width of their distribution at the beginning of the Al2O3 powder sintering process was confirmed. Furthermore, the possibility of using the analyzed variants of powders for binder jetting technology was assessed. The dependence of the particle size of the powder used on the quality of the printed parts was demonstrated. The procedure presented in this paper, which involves analyzing the properties of alumina varieties, was used to optimize the Al2O3 powder material for binder jetting printing. The selection of the best powder in terms of technological properties and good sinterability makes it possible to reduce the number of 3D printing processes, which makes it more economical and less time-consuming.

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Section: Introductionmentioning

confidence: 99%

Influence of Alumina Grade on Sintering Properties and Possible Application in Binder Jetting Additive Technology

Kwiatkowski,

Marczyk,

Putyra

et al. 2023

Materials

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“…Final properties and microstructure of the ceramic material depend on each step of the production process: powder preparing, shaping of the green bodies and sintering process [9,10].…”

Section: Introductionmentioning

confidence: 99%

Conventional and Non-conventional Sintering Techniques of High Purity Alumina Ceramics

Ropuš¹,

Ćurković

Mandić

et al. 2021

Teh. vjesn.

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The goal of this study is to compare the properties of cold isostatically pressed (CIP) alumina (A2O3) samples sintered by conventional (electrical) and nonconventional (hybrid microwave) techniques. X-ray diffraction was used to determine phase composition of A2O3 samples (raw powder and granules). Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were used to investigate the thermal behaviour of the Al2O3 powder and granules during the thermal treatment. Compaction of spray dried A2O3 granules into green compact bodies was performed by CIP, followed by sintering of green bodies at 1600 °C in an electrical and hybrid microwave kiln, respectively. Scanning electron microscopy (SEM) was used to analyse morphology of the Al2O3 granules and fracture surface of Al2O3 compacts derived by both sintering techniques. Higher linear shrinkage and densification were obtained for alumina samples sintered in electrical kiln (conventional method), while sintering by faster and more energy efficient hybrid microwave kiln (non-conventional sintering method) yielded alumina samples with finer grain size. Alumina samples sintered by electrical kiln displayed higher relative densities and lower porosities.

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