Overview
Ready-to-press silicon carbide (RTP SiC) granules is being produced using spray drying or spray freeze drying technique through an intermediate colloidal processing route. This method is capable of producing different size spherical granules with narrow size distribution and improved flow characteristics. As the granules are produced from uniformly dispersed slurries of SiC powder, hence wide range of additives can be accommodated in the formulation of the RTP granules. This process is beneficial to manufacture the feedstock for producing green SiC compacts with high density, defect free homogenous microstructure. The sintered products thus produced exhibit superior properties than conventionally produced SiC. The technique has been adapted to produce RTP granules comprising water sensitive nitride based composite powders.
Key Features
- Cost effective technique to produce RTP SiC granules.
- Flexibility to incorporate either solid-state or liquid-phase sintering additives in the formulation of RTP granules.
- Control on granule size with narrow distribution
- The process can be adopted for manufacturing various oxide or non-oxide ceramics.
- Up to 97.8 % relative density achieved in the sintered parts.
Potential Applications
- Feedstock for manufacturing of high performance SiC, Si3N4, SiAlON components
Status
- RTP granules processed in the laboratory scale
- Scaling up the process is in progress
Intellectual Property Development Index (IPDI)
Level
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10
Description
Basic concepts and understanding of underlying scientific principles
Shortlisting possible applications
Research to prove technical feasibility for targeted application
Coupon level testing in simulated conditions
Check repeatability/consistency
Prototype testing in real-life conditions
Check repeatability/consistency
Reassessing feasibility (IP, competition technology, commercial)
Initiate technology transfer
Support in stabilizing production
Status
| Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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| Description | Basic concepts and understanding of underlying scientific principles | Shortlisting possible applications | Research to prove technical feasibility for targeted application | Coupon level testing in simulated conditions | Check repeatability/consistency | Prototype testing in real-life conditions | Check repeatability/consistency | Reassessing feasibility (IP, competition technology, commercial) | Initiate technology transfer | Support in stabilizing production |
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- P. Barick, B. P. Saha, S. V. Joshi and R. Mitra, Spray-freeze-dried nano-crystalline SiC containing granules: processing, compaction behaviour and sintering, J. Euro. Ceram. Soc., 36 (2016), 3863-3877