Sintering Wear Parts with Microwave Heating

Fall, Morgana L.; Shulman, Holly S.; Walker, William J.; Wolfe, Larry A.

doi:10.1002/9781118380826.ch1

Cited by 1 publication

(1 citation statement)

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“…Energy dissipation in the sample, the pod, the susceptors are known to contribute for a non-uniform distribution of the electric field inside the resonant cavity; this drawback can be minimized by using mode stirrers or turntables. The densification achieved was not noticeably influenced by the heating rate and is far lower than that reported by other authors [6,7] for comparable sintering temperatures, probably due to the fact that the volume of the pod and the ratio mass of susceptor/mass of sample were not optimised. Anyway, it is clear that MW absorption above a certain temperature (typically above 1000ºC) has resulted in significant densification in contrast with conventional heating where little effect on densification is noticed at such low temperatures.…”

Section: Transparent Materialscontrasting

confidence: 53%

Microwave Sintering – A Novel Approach to Powder Technology

Marcelo

Mascarenhas

Oliveira

2010

MSF

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The present paper focus on preliminary work carried out at INETI concerning the use of microwave radiation applied to sintering of both ceramic and metal powders. Due to the characteristics of materials-radiation interaction, microwaves can become an interesting power source in powder technology and other processing routes, since it is possible to lower the sintering temperature and shorten the sintering cycles, leading to time and energy savings. Alumina, hydroxyapatite, titanium and stainless steel powder compacts were sintered in a modified commercial oven of 2.45GHz and 1000W nominal power. Microwave susceptors were used to enable temperature rise during the initial stage of the sintering cycles. Results on densification and microstructural evaluation of microwave sintered samples are reported and compared to conventionally sintered ones, when available. For similar porosity levels upon sintering, microwave radiation generally reduces sintering times from several hours to minutes. The results obtained so far are quite encouraging since in the case of alumina and stainless steel compacts, a decrease of about 200°C in the sintering temperature was achieved. It was also found that the green density plays a key role in the densification of both metallic and ceramic powders.

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Section: Transparent Materialscontrasting

confidence: 53%