TaC Coated Graphite Crucible

Name: TaC Coated Graphite Crucible
Brand: SiC Graphite
SKU: tac-coated-graphite-crucible
Availability: InStock
Rating: 4.9 (24 reviews)

Tantalum carbide coated graphite crucibles for ultra-high-temperature SiC PVT and AlN crystal growth environments where standard SiC coating can degrade above 2000°C.

Target Buyer:SiC wafer manufacturers and crystal-growth R&D teams qualifying longer-life hot-zone consumables.

TaC coated graphite crucible for ultra-high-temperature SiC PVT crystal growth 1

Capability Highlights

CVD TaC barrier layer for extreme vapor corrosion resistance
Designed for SiC PVT growth zones approaching 2200-2300°C
High-purity graphite substrate with drawing-based coating scope

Typical Applications

4H-SiC PVT Crystal Growth
AlN Crystal Growth
Ultra-High-Temperature Source Zones

Engineering Focus

TaC coating continuity
Graphite substrate purity
Thermal stress and coating adhesion

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Maximum Service Temperature	Application review up to 2300°C class	TaC is selected when SiC coated or purified graphite parts face severe high-temperature degradation.
Coating Material	CVD tantalum carbide on graphite	A dense carbide barrier can reduce graphite vapor interaction with the crystal-growth atmosphere.
TaC Coating Route	CVD TaC on high-purity graphite substrate	The coating route must match geometry, vapor exposure, and thermal-cycle stress.
Ultra-High-Temperature Use	Project review for 2000-2300°C class hot zones	TaC is used when conventional graphite or SiC coating cannot provide enough high-temperature stability.
Coating Map	Buyer-marked vapor-facing, contact, and masked surfaces	Unclear coating boundaries create fit risk, shadow areas, and early erosion points.
Trace Element Control	Buyer-defined Ta, Fe, Ni, Al, Ca, V, Ti limits	High-value crystal-growth programs need contamination limits agreed before sample production.

Engineering Datasheet

Product-Level Technical Specifications

Values below are RFQ planning targets, not blanket guarantees. Final acceptance criteria should be frozen against drawings, process conditions, equipment model, and buyer qualification requirements.

Parameter	Target / Typical Scope	Engineering Note
Base material	High-purity isostatic graphite substrate selected by density, grain size, and thermal stress risk	The substrate still controls machining stability, impurity background, and coating stress.
Coating type	CVD TaC barrier coating on marked graphite surfaces	TaC is reviewed for SiC PVT and AlN vapor-facing zones where conventional SiC coating may be lifetime-limited.
Coating boundary	Buyer-marked vapor-facing, mating, seed-side, masked, and uncoated surfaces	Coating scope must be frozen before quote lock because post-coating dimensions and fit can change.
Service temperature review	Project review for 2000-2300C class PVT hot zones	Maximum usable condition depends on atmosphere, vapor exposure, thermal cycling, and graphite geometry.
Wall thickness and edge radius	Drawing-defined crucible wall, bottom radius, lip geometry, and edge treatment	Thin walls and sharp edges increase coating stress, handling risk, and crack initiation.
Post-coating dimensional control	CTQ OD, ID, height, lid fit, groove, thread, and seating surfaces by drawing	Fit-critical features should define whether inspection is pre-coating, post-coating, or both.

Trace Impurity Review Table

Semiconductor programs should define restricted elements before sample production. The table helps procurement and process teams turn purity expectations into a measurable qualification file.

Element	Typical Limit	Why Controlled
Ta background	Reviewed as coating-material baseline	TaC coating introduces tantalum as the functional barrier; buyers should define how it is reported.
Fe / Ni / Cr	Buyer-defined ppm or ppb boundary	Transition metals are common concerns for SiC boule quality and crystal-growth qualification.
Al / Ca / Na	Project-specific restricted elements	These elements are often included in high-purity graphite and coating acceptance files.
V / Ti	Buyer-defined limits for SiC growth programs	Trace metals can be part of crystal defect, compensation, and contamination review.

RFQ Evidence Package

These records reduce ambiguity before sample approval and repeat-order release.

Marked crucible drawing with vapor-facing, masked, mating, and uncoated surfaces.
Pre-coating and post-coating CTQ dimensional record where fit is critical.
TaC coating visual inspection photos and agreed coating-boundary acceptance criteria.
Substrate purity route, ash target, restricted-element list, and lot COA scope.
Clean packing photos with edge protection for brittle coated crucible features.

Equipment Compatibility Review

Compatibility should be treated as an engineering review, not a catalog claim. Equipment-family language helps buyers route the RFQ, while final production still depends on drawings, samples, coating allowance, and acceptance criteria.

Equipment Family	Compatible Part Scope	Buyer Validation Required
SiC PVT crystal-growth furnaces	TaC coated crucibles, source-zone crucibles, lids, liners, and vapor-facing graphite hardware.	Confirm furnace generation, boule diameter, source layout, growth temperature, vapor path, and mating hot-zone parts.
AlN and advanced wide-bandgap growth reactors	TaC coated crucibles and graphite containment parts for ultra-high-temperature vapor exposure.	Confirm atmosphere, vapor chemistry, crucible geometry, coating boundary, and impurity-report expectations.
Custom R&D PVT hot zones	Drawing-based TaC coated crucibles and graphite thermal-field parts for pilot qualification.	Confirm current failure mode, run count target, coated surfaces, masking surfaces, and sample evidence requirements.

Open full OEM compatibility matrix

Product Selection Logic

Decision Factor	Selection Logic	Buyer Check
Temperature ceiling	Review TaC coated graphite when the component faces SiC PVT, AlN growth, or vapor exposure beyond the reliable window of standard graphite or SiC coating.	Share maximum temperature, hot-zone position, atmosphere, vapor species, and current lifetime.
Coating feasibility	TaC coating feasibility depends on line-of-sight, feature depth, edge radii, masked surfaces, and final dimensions after coating.	Send drawings with vapor-facing surfaces, seed-contact surfaces, grooves, holes, and uncoated interfaces marked.
Contamination control	High-purity graphite substrate, purification route, and trace-element reporting should be agreed before prototype release.	Define restricted elements, report format, packaging cleanliness, and sample acceptance criteria.

Manufacturing and QC Flow

Stage	Production / QC Checkpoint	Buyer Evidence
1. Process and geometry review	Confirm hot-zone position, growth temperature, vapor exposure, coated surfaces, and masked interfaces.	Marked drawing, process notes, current failure photos, and lifetime target.
2. Substrate and purity plan	Select high-purity graphite substrate and define purification plus trace-element reporting scope.	Material route, ash target, restricted-element list, and COA expectations.
3. Pre-coating machining	Machine OD, ID, grooves, seed-contact surfaces, and CTQ interfaces with coating allowance reviewed.	First-article dimensional data for pre-coating critical features.
4. CVD TaC coating	Deposit TaC on agreed surfaces while controlling coating stress, edge coverage, and shadow risk.	Coating map, visual acceptance criteria, and inspection method agreed before production.
5. Final inspection and clean packing	Inspect contact surfaces, coated areas, fit-critical features, and export protection for brittle coated parts.	Final photos, dimensional checks where required, packing photos, and traceable shipment documents.

RFQ Checklist

Provide crucible drawing with coated and uncoated surfaces marked
Specify growth temperature, atmosphere, and source-vapor exposure
Define TaC coating thickness target and impurity-report expectations
Share current failure mode: sublimation, peeling, carbon inclusion, or short lifetime

Risk Controls

TaC coating stress or peeling: Review substrate grade, wall thickness, edge radius, coating map, and heat-cycle assumptions before quotation.
Carbon or metal contamination in growth zone: Align purification route and trace-element reporting with the buyer acceptance plan.

Product Gallery

TaC coated graphite crucible for ultra-high-temperature SiC PVT crystal growth 2

TaC coated graphite crucible for ultra-high-temperature SiC PVT crystal growth 3

TaC coated graphite crucible for ultra-high-temperature SiC PVT crystal growth 4

TaC coated graphite crucible for ultra-high-temperature SiC PVT crystal growth 5

Buyer FAQ

When should TaC coating be considered instead of SiC coating?

TaC coating should be reviewed for SiC PVT, AlN growth, and other ultra-high-temperature zones where SiC coating lifetime or vapor stability is the limiting risk.

What makes TaC coating different from SiC coating?

TaC coating is selected for more extreme high-temperature and vapor-corrosion environments, especially SiC PVT and AlN growth zones where SiC coating lifetime may be limited.

What information is required before quoting TaC coated parts?

Send drawings, marked coated surfaces, process temperature, atmosphere, vapor exposure, current failure mode, purity limits, and expected replacement cycle.

Can TaC coated graphite parts be made as direct replacements?

Yes, but coating allowance, masked interfaces, edge radii, and post-coating dimensions must be reviewed so the replacement still fits the furnace assembly.

Related Resources

Procurement Next Steps

Compare the full product portfolio before locking material architecture.
Match the part to a process solution for thermal-field and contamination constraints.
Review OEM capability controls for machining, coating, purification, and export packaging.
Send a drawing-based RFQ with process, material grade, tolerances, quantity, and delivery target.

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