Hybrid low‐temperature sintering processes of electro‐ceramics

Li, Xiaomeng; Fu, Changli; Xu, Weichen; Zhao, Xuetong; Xu, Wan; Wang, Fuliang; Guo, Jing

doi:10.1111/jace.19539

Cited by 3 publications

(1 citation statement)

References 88 publications

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“…In this approach, microwave sintering at lower temperatures results in the densification of ceramic samples prepared after mixing the ceramic powder with a transient liquid phase such as deionized water, acidic, or basic aqueous solutions. [27] An alternate hybrid microwave sintering is also carried out using a combination of microwave heating and infrared heating from susceptors surrounding the ceramic sample. This technique helps in sintering ceramics with low dielectric loss by means of infrared radiation-based heating at lower temperatures using susceptors made of materials having high dielectric loss.…”

Section: Microwave Sinteringmentioning

confidence: 99%

Making the Case for Scaling Up Microwave Sintering of Ceramics

Aman,

Acharya,

Reeja‐Jayan

2024

Adv Eng Mater

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The densification and sintering of ceramics using microwaves was first reported in the mid‐1960s. Today, the reduced carbon footprint of this process has renewed interest as it uses less energy overall compared to conventional process heating/furnaces. However, scaling‐up and commercializing the microwave sintering process of ceramics remains a formidable challenge. As a contactless method, microwave sintering offers geometric flexibility over other field‐assisted sintering processes. Yet, the inability to address multi‐scale, multi‐physics‐driven heterogeneities arising during microwave coupling limits discussions about a future scale‐up process. We make the case here that unlike 60 years ago, new advances in multiscale computational modeling, materials characterization, control systems and software open up new avenues for addressing these challenges. More importantly, the rise of additive manufacturing techniques demands the innovation of sintering processes in the ceramics community for realizing near‐net‐shaped and complex parts for applications ranging from medical implants to automotive and aerospace parts.This article is protected by copyright. All rights reserved.

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Section: Microwave Sinteringmentioning

confidence: 99%

Making the Case for Scaling Up Microwave Sintering of Ceramics

Aman,

Acharya,

Reeja‐Jayan

2024

Adv Eng Mater

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Cold Sintered ZnO-Polystyrene (PS) Composites with Modified Interfacial Structures and Properties

Tai,

Si,

Saad

et al. 2024

ACS Appl. Mater. Interfaces

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Lightweight and integrated electronic devices with high performance have become an inevitable trend in the development of power electronic systems. However, it is challenging to obtain lightweight and miniaturized varistors due to the low threshold electric field. Herein, (1 − x)ZnO-xPS composites with a high threshold electric field are prepared through a cold sintering process at 220 °C for 50 min, utilizing lightweight PS to modulate the grain boundary structures of ZnO varistors. With PS content ≤1.5 wt %, the relative densities of cold sintered composites exceed 95%. PS thin layers with a thickness of 2−10 nm are distributed at the grain boundaries of ZnO, forming the Schottky barrier, which triggers nonlinear current−voltage responses. With the addition of PS, the threshold electric field is dramatically enhanced from 135 to 2703 V•mm −1 , higher than that of commercial ZnO varistors, which is further demonstrated by the electric field simulation of the Finite Element Method. The interfacial resistance obtained from impedance analysis increases with the increase of the PS content, and the activation energy of (1 − x)ZnO-xPS composites is higher than that of pure ZnO ceramics. This study provides a promising approach for the development of lightweight and cost-effective varistor materials.

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Magnesium-Titanium Alloys: A Promising Solution for Biodegradable Biomedical Implants

Sharma,

Gajević,

Sharma

et al. 2024

Materials

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Magnesium (Mg) has attracted considerable attention as a biodegradable material for medical implants owing to its excellent biocompatibility, mitigating long-term toxicity and stress shielding. Nevertheless, challenges arise from its rapid degradation and low corrosion resistance under physiological conditions. To overcome these challenges, titanium (biocompatibility and corrosion resistance) has been integrated into Mg. The incorporation of titanium significantly improves mechanical and corrosion resistance properties, thereby enhancing performance in biological settings. Mg–Ti alloys are produced through mechanical alloying and spark plasma sintering (SPS). The SPS technique transforms powder mixtures into bulk materials while preserving structural integrity, resulting in enhanced corrosion resistance, particularly Mg80-Ti20 alloy in simulated body fluids. Moreover, Mg–Ti alloy revealed no more toxicity when assessed on pre-osteoblastic cells. Furthermore, the ability of Mg–Ti-based alloy to create composites with polymers such as PLGA (polylactic-co-glycolic acid) widen their biomedical applications by regulating degradation and ensuring pH stability. These alloys promote temporary orthopaedic implants, offering initial load-bearing capacity during the healing process of fractures without requiring a second surgery for removal. To address scalability constraints, further research is necessary to investigate additional consolidation methods beyond SPS. It is essential to evaluate the relationship between corrosion and mechanical loading to confirm their adequacy in physiological environments. This review article highlights the importance of mechanical characterization and corrosion evaluation of Mg–Ti alloys, reinforcing their applicability in fracture fixation and various biomedical implants.

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Hybrid low‐temperature sintering processes of electro‐ceramics

Cited by 3 publications

References 88 publications

Making the Case for Scaling Up Microwave Sintering of Ceramics

Making the Case for Scaling Up Microwave Sintering of Ceramics

Cold Sintered ZnO-Polystyrene (PS) Composites with Modified Interfacial Structures and Properties

Magnesium-Titanium Alloys: A Promising Solution for Biodegradable Biomedical Implants

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