Effect of Processing Parameters on the Mechanical and Microstructural Behavior of Ultra‐Fine Al₂O₃– (ZrO₂+8%Mol Y₂O₃) Bioceramic, Densified By High‐Frequency Induction Heat Sintering

Abstract

High‐frequency induction heat sintering (HFIHS) is a comparatively new technique that consolidates metals and ceramics very rapidly to full density. In this work, superfast densification behavior and the attendant microstructural features of Al2O3–(ZrO2+8% mol Y2O3) composites processed by HFIHS were investigated. The effects of processing parameters such as sintering temperatures, pressures, and heating rate, on the mechanical and microstructural properties were studied. The results indicated that HFIHS was effective in the preparation of fine‐grained, nearly fully dense Al2O3–8YSZ ceramics from the powder with a smaller particle size by optimizing the overall processing parameters.

Toughening mechanisms and mechanical properties of graphene nanosheet-reinforced alumina

“…After spark plasma sintering, HFIHS is a new addition in high-temperature ceramic powder compaction, involving consolidation at desirable temperatures in a very short time span after heating at extremely high rate under vacuum and uniaxial pressure. Although the ceramic powder consolidation is carried out in a graphite die like in case of hot-pressing, the heating is done using high-frequency power source to drive large alternative current through a Cu induction coil surrounding the graphite mold [28]. In this way, the HFHIS provides a right amount of heat to the loose composite powders quickly for them to attain maximum possible densification under pressure with minimum damage to the primary structures of the nanocomposite constituents.…”

“…One of the potential drawbacks associated with conventional pressureless sintering and hot-pressing (HP) techniques for ceramic composite fabrication are chemical/thermal deterioration of the graphene crystalline quality and grain growth of the matrix materials due to prolonged heating cycle [16,27]. To eliminate these issues, novel sintering techniques involving relatively lower sintering temperatures and/or reduced dwell times at elevated temperatures, have been explored [28], rapid spark-plasma sintering (SPS) process one of them for fabrication of Al 2 O 3 /graphene nanocomposite [22][23][24][25][26]. Another relatively new rapid sintering technology is high-frequency induction heat sintering (HFIHS) process that enables rapid heating to desirable consolidation temperatures and has been successfully utilized for consolidation and sintering of several metallic, monolithic ceramics and composite powders to near theoretical densities.…”

A Novel Bio-Nanocomposites Composed of Hydroxyapatite Reinforced with TiO2 Electrospun Nanofiber Consolidated Using High-Frequency Induction Heating

“…11a–c. The addition of electrospun nanofibers led to improve the densification process and eliminate the pores 35 . As shown in Figs.…”

“…The mixed composites were placed in a graphite die (outside diameter, 45 mm; inside diameter, 20 mm; height, 40 mm) and then introduced into the HFIHS machine. Details of this apparatus are introduced elsewhere 31–36 . The sintering process was carried out in a vacuum atmosphere at 1050°C.…”

“…It is therefore essential to minimize grain growth through the careful control of consolidation parameters, particularly temperature and sintering time. To this end, the technique of high‐frequency induction heat sintering (HFIHS) has been shown to be an effective sintering method, which can successfully consolidate ceramics and metallic powders to near theoretical density 33–35 …”