Microwave Sintering of Multilayer Integrated Passive Devices

Vaidhyanathan, Bala; Ketharam, Annapoorani; Binner, Jon; Ramesh, Raghavendra

doi:10.1111/j.1551-2916.2010.03740.x

Cited by 15 publications

(10 citation statements)

References 20 publications

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“…For example, research on the firing of zinc oxide varistors yielded results that showed that hybrid sintered devices exhibited more homogeneous and finer microstructures that exhibited superior electrical properties [15]. In addition, the combination of hybrid heating with a new firing strategy known as two stage sintering [16] has yielded the ability to achieve nanostructured zirconia with densities >99.5% of theoretical whilst retaining final average grain sizes as fine as just 65 nm using precursor nanopowders with an average grain size of ~16 nm [17], figure 3.…”

Section: Mixing In High Loss Additivesmentioning

confidence: 99%

When Should Microwaves Be Used to Process Technical Ceramics?

Binner

Vaidhyanathan

2008

MSF

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This paper attempts to shed light on why the stand alone microwave processing of technical ceramics, despite being one of the most popular field with respect to volume of research performed, is still struggling to achieve priority status with respect to commercialisation. To obtain some answers to this enigma and determine when microwaves should be used to process technical ceramics, three case studies are explored. The conclusion is that microwaves should be used to process technical ceramics when specific advantage can be taken of the intrinsic nature of microwave energy and not simply as an alternative energy source. In addition, it is concluded that from a commercialisation view point hybrid processing is often a better approach than the use of pure microwaves.

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Section: Mixing In High Loss Additivesmentioning

confidence: 99%

When Should Microwaves Be Used to Process Technical Ceramics?

Binner

Vaidhyanathan

2008

MSF

Self Cite

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“…Therefore, much higher heating rates are achievable with microwaves, which is one of the most important factors in many processes. Along with the evident energy savings and reduction in process duration, high rates of microwave heating can help improve the product quality, resulting in the final materials with finer and less defective microstructures and enhanced functional properties . The role of high heating rates in densification enhancement has been demonstrated in other field‐assisted techniques, such as spark plasma sintering …”

Section: Introductionmentioning

confidence: 99%

Microwave Sintering: Fundamentals and Modeling

2013

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This paper reviews the basic physical notions underlying microwave sintering and the theoretical and numerical models of the microwave sintering process. The propagation and absorption of electromagnetic waves in materials, and the distribution of electromagnetic field in cavity resonators that serve as applicators for microwave processing are discussed and the electromagnetic modeling of such applicators is reviewed. The microwave absorption properties of ceramic and metal powder materials and the methods of their description are addressed. Self‐consistent electromagnetic and thermal models that are capable of predicting the temperature distribution in the microwave‐heated materials and dynamic effects such as thermal runaway instabilities are reviewed. The multiphysics simulations that combine electromagnetic, thermal, and sintering models and result in predicting densification, shrinkage, and grain structure evolution are discussed in detail. The significance of microwave nonthermal effects in sintering is demonstrated based on the experimental results, and the models of such effects are reviewed.

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“…This is an important advance in terms of energy saving and reduction in process duration and, consequently, of the economic cost. This can help to improve the product quality, resulting in the final materials with finer and less defective microstructures and enhanced functional and structural properties [29].…”

Section: Fig 3 Represents the Fe-sem Fracture Surface Of Las Samplesmentioning

confidence: 99%

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Benavente

Salvador

Moreno

et al. 2014

Int J Applied Ceramic Tech

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Lithium aluminosilicate was fabricated by conventional and non-conventional sintering:microwave and spark plasma sintering, from 1200 to 1300 ºC. A considerable difference in densification, microstructure, coefficient of thermal expansion behavior and hardness and Young's modulus was observed. Microwave technology made possible to obtain fully dense glass-free lithium aluminosilicate bulk material (>99%) with near-zero and controlled coefficient of thermal expansion and relatively high mechanical properties 1 (7.1 GPa of hardness and 110 GPa of Young's modulus) compared to the other two processes. It is believed that the heating mode and effective particle packing by microwave sintering are responsible to improve these properties.

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Microwave Sintering of Multilayer Integrated Passive Devices

Cited by 15 publications

References 20 publications

When Should Microwaves Be Used to Process Technical Ceramics?

When Should Microwaves Be Used to Process Technical Ceramics?

Microwave Sintering: Fundamentals and Modeling

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

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