COMPONENT
CF-SN · Corefra CF-SN silicon nitride crucible-coating powder
Hebei Corefra Silicon Nitride Material ↗Corefra's CF-SN is a silicon nitride powder for the release coating on quartz crucibles in multicrystalline ingot casting. It ships against a published chemistry and particle-size table; coating and furnace settings are worked out in your own trial.
Based on Corefra's Chinese CF-SN product page and its specification table. The page gives no slurry formula, coating thickness, phase-content limit or furnace cycle.
General illustration of wafer processing equipment, not a photograph of this model. Ask the manufacturer for current photographs and layout drawings of the configuration offered.
START WITH YOUR PRODUCTION TASK
Order CF-SN against its current specification with lot certificates, then qualify dispersion, coating and casting on your own crucible and furnace before production. Ask Corefra to confirm in writing the size distribution, coating guidance and producing site.
SOURCE-LINKED DATA
Published specifications
Values below are published by the manufacturer, each with the date its source was checked. Ask for the figures that apply to your configuration and material in the quotation.
The manufacturer has not published a complete specification table for this entry. Request the delivered material specification, drawing where applicable and lot acceptance requirements.
01 · Manufacturer information
Where CF-SN sits in multicrystalline casting
Corefra sells CF-SN as a release-agent powder. It is sprayed onto the inside of high-purity quartz crucibles before multicrystalline silicon ingots are cast. Corefra says the powder starts from high-purity silicon feedstock and goes through multistage particle-size matching and purification.
Buying CF-SN means buying the coating raw material. The crucible, slurry, spray process and furnace route belong to your engineering team, and Corefra's application guidance bridges the step from powder to coated crucible. The product is separate from Corefra's ceramic bearings, from finished crucibles and from PECVD coating gases. For crystal-growth methods other than multicrystalline casting, ask Corefra about suitability first.
02 · Manufacturer information
CF-SN limits and the test method for each
| Item | Limit or value | Instrument and standard |
|---|---|---|
| Nitrogen N | >39% | Kjeldahl nitrogen analyser; GB/T 16555-2017. |
| Oxygen O | ≤1.0% | Inert-gas pulse infrared thermal-conductivity method; GB/T 16555-2017. |
| Carbon C | ≤0.2% | High-frequency infrared carbon analyser; GB/T 16555-2017. |
| Iron Fe | ≤5 ppm | ICP-MS; GB/T 30902-2014. |
| Aluminium Al | ≤5 ppm | ICP-MS; GB/T 30902-2014. |
| Calcium Ca | ≤5 ppm | ICP-MS; GB/T 30902-2014. |
| Manganese Mn | ≤5 ppm | ICP-MS; GB/T 30902-2014. |
| Copper Cu | ≤5 ppm | ICP-MS; GB/T 30902-2014. |
| D50 | 2 µm | Laser particle-size analyser; GB/T 19077-2016. |
03 · PVYard procurement analysis
What the D50 figure leaves out
Median versus full distribution
A D50 of 2 µm says nothing about D10, D90, oversize particles or agglomerates. A coating line needs the full distribution, the dispersion conditions used for the measurement and a lot tolerance.
Phase and surface data
Alpha/beta phase content, specific surface area and particle shape are absent from the table. Values published for other silicon nitride powders will not carry over, so ask Corefra for CF-SN data matched to your coating process.
Trace contamination
Oxygen, carbon and the five metals are controlled at the powder stage. Whether the finished ingot meets your contamination limits is settled by the casting trial and the lot certificates behind it.
04 · PVYard procurement analysis
Qualifying CF-SN on your crucibles
Describe the application
Send Corefra the crucible material and size and your ingot and furnace route. Ask it to confirm CF-SN suits that route and to supply the controlled grade specification.
Get dispersion instructions
Ask which liquids and binders Corefra permits, how to mix and disperse the powder, and how to handle it safely. The solids content belongs in these instructions.
Set coating and drying acceptance
Trial the coating equipment and crucibles you will use in production. Record coverage, thickness, adhesion, drying and handling conditions agreed with your engineers.
Run a controlled cast
Keep the powder lot, slurry and coating records together. Judge release behaviour, ingot integrity and contamination against limits set before the cast; furnace schedule and yield targets are your own.
Lock the approved package
Tie the lot certificate, specification revision, coating procedure and trial results together. Any change to powder, crucible, dispersion ingredients or furnace process goes through review before release.
05 · PVYard procurement analysis
Documents to request with your CF-SN quote
Grade revision and lot certificate
The current CF-SN revision, measured lot chemistry and separate results for Fe, Al, Ca, Mn and Cu with the sampling and test basis.
Particle-size and phase data
Full size distribution and tolerance, the measurement conditions, and phase and surface data relevant to your process.
Coating guidance and SDS
The current powder SDS and Corefra's slurry and coating instructions for your crucible, plus storage, moisture protection and handling of opened packs.
Packing, site and lead time
Pack size, lot marking, producing site and lead time, all confirmed in writing because the product page gives no commercial terms.
Trial terms and change notice
Sample quantity, inspection and casting acceptance, reserve samples kept from each lot, and advance notice of changes to the grade or production process.
06 · PVYard procurement analysis
CF-SN buyer questions
Is 2 µm the largest particle allowed?
The table labels 2 µm as D50, the median. Ask Corefra for the full distribution and an oversize limit.
Will the table alone give me a high-purity ingot?
The table sets powder limits. Ingot purity also depends on slurry preparation, the crucible and the casting process, so qualify all three against your ingot acceptance.
What slurry concentration should I use?
The product page gives no concentration. Get Corefra's instructions and trial them on your real coating line.
Do the five metals share one 5 ppm limit?
Each of Fe, Al, Ca, Mn and Cu has its own row at ≤5 ppm, so each is limited separately.
Can CF-SN be used for monocrystalline pulling?
Corefra names multicrystalline ingot casting as the application. For any other crystal-growth process, ask Corefra to confirm suitability in writing.
TURN THIS INTO A CLEAR REQUEST
Ask about this product
Include the product-specific questions above and replace every bracket with your actual requirement. Save your edited text to your sourcing brief, then review it before submitting an enquiry. Saving a brief does not send it to a manufacturer.
Sources
Manufacturer information and our buying guidance are labelled section by section above. Each source below shows the date it was checked.
CF-SN product page and specification table ↗
Source check: 2026-10-11 · Casting application plus the chemistry and particle-size table with test methods.