Material: Ni Zn Ferrite
Sintering temperature: 1142 degree Celcius
Sintering atmosphere: Normal air
My guess No. 1 is that some foreign material like a fiber existed in the green compact. It might have got burnt away during sintering. The material on either side of the foreign material pull away from the space vacated by it and enlarge the defect.
Guess No. 2 is that there was a soft agglomerate in the powder that got retained in the green body. The soft agglomerate shrinks more than the surrounding, leaving a gap after sintering.
Hi! Are you using high heating rates? I suggest you try it again with lower heating rates.
It could be happening due to imprisioned gas from remained organics. If you are using high heating rates you can be sintering it with high gradient temperatures
Hi Mr. Saddam Amir ,
Without much knowing on what constituents you are subjecting to Sintering process, please note following points carefully and analyze them – to solve and or reduce your concerns.
* None of the individual components you are trying to put through sintering process, has Melting Temperature below the Sintering temperature you are working.
* Make sure no impurities, No incompatible materials- are entering in your process -especially if you are using Minerals in your composite, which may have sulphur-chloride related impurities.
* Make sure you do not have any low melting, organic materials like Fibers etc. (used for reinforcements in many composites) entering in your process .
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