Graphite Crucible Lid & Cover

Name: Graphite Crucible Lid & Cover
Brand: SiC Crystal Crucibles
Availability: InStock
Rating: 4.8 (26 reviews)

High-purity graphite lids, covers, sleeves, liners, and matching crucible interfaces machined for SiC PVT growth and high-temperature vacuum furnace consumables.

Target Buyer:PVT process engineers and furnace maintenance teams replacing graphite crucible subcomponents by drawing.

Graphite crucible lid and cover for SiC PVT growth assemblies

Capability Highlights

Drawing-based lid, cover, sleeve, liner, ring, and holder support
Purification and optional coating reviewed by hot-zone position
Mating clearances and concentricity checked across crucible assemblies

Typical Applications

SiC PVT crucible lid and seed-holder interfaces
High-purity graphite liners and sleeves for crystal growth furnaces
Replacement covers and rings for vacuum furnace hot-zone consumables

Engineering Focus

Lid fit, vapor containment, and thermal expansion clearance
Purity, ash target, coating surfaces, and cleaning route
Thread, groove, bore, and mating-face tolerance stack-up

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Assembly Fit	Defined by drawing and mating crucible interface	Lid, liner, and sleeve fit influence vapor containment, thermal symmetry, and repeatability.
Purity Target	< 10ppm; < 5ppm reviewed by application	Low ash graphite reduces contamination risk near SiC growth and semiconductor furnace hot zones.

RFQ Checklist

2D/3D drawings for the lid, cover, liner, sleeve, ring, or holder
Mating crucible dimensions and assembly clearance requirements
Graphite grade, density, ash target, coating, and cleaning needs
Operating atmosphere, temperature, cycle length, and wear observations
Sample quantity, annual forecast, destination, and required delivery date

Risk Controls

Assembly interference after thermal cycling: Review tolerance stack-up, thermal expansion assumptions, and mating surfaces before sample machining.
Unclear coating boundary: Mark coated, uncoated, masked, and mating surfaces directly on the drawing for process planning.

RFQ Pricing, Shipping, and Returns

Pricing: Custom B2B quotes are prepared after drawings, material grade, coating scope, quantity, packing, and delivery plan are confirmed.
Shipping: Export packing, Incoterms, freight method, insurance, and delivery window are quoted per RFQ and destination.
Returns: Made-to-drawing graphite components do not use standard consumer returns; quality claims follow the approved quotation, contract, and inspection records.

Product Gallery

High-purity graphite crucible cover machined by drawing

Machined graphite lid for thermal-field and susceptor assemblies

Custom graphite cover with machined mating interface

Decision fit

Who should evaluate this

PVT process engineers and furnace maintenance teams replacing graphite crucible subcomponents by drawing.

Primary proof point

Assembly Fit

Defined by drawing and mating crucible interface

Lid, liner, and sleeve fit influence vapor containment, thermal symmetry, and repeatability.

RFQ trigger

Data needed first

2D/3D drawings for the lid, cover, liner, sleeve, ring, or holder
Mating crucible dimensions and assembly clearance requirements
Graphite grade, density, ash target, coating, and cleaning needs

Selection and Acceptance Logic

Decision Gate	What Buyers Should Check	Acceptance Evidence
Use-case fit	SiC PVT crucible lid and seed-holder interfaces; High-purity graphite liners and sleeves for crystal growth furnaces; Replacement covers and rings for vacuum furnace hot-zone consumables	Application, furnace duty, and buyer-side validation goal are confirmed before material or process route selection.
Parameter baseline	Assembly Fit: Defined by drawing and mating crucible interface; Purity Target: < 10ppm; < 5ppm reviewed by application	Target ranges, report needs, and pass/fail criteria are written into the RFQ or sample approval plan.
Risk closure	Assembly interference after thermal cycling: Review tolerance stack-up, thermal expansion assumptions, and mating surfaces before sample machining.; Unclear coating boundary: Mark coated, uncoated, masked, and mating surfaces directly on the drawing for process planning.	Drawing notes, inspection scope, cleaning, coating, packaging, and traceability controls are agreed before repeat supply.
RFQ completeness	2D/3D drawings for the lid, cover, liner, sleeve, ring, or holder; Mating crucible dimensions and assembly clearance requirements; Graphite grade, density, ash target, coating, and cleaning needs; Operating atmosphere, temperature, cycle length, and wear observations	Engineering can return a quote direction without avoidable loops for drawing, purity, coating, quantity, or delivery gaps.

Factory Execution Path

1
Application and drawing review
Confirm furnace duty, drawing revision, target purity, operating atmosphere, and replacement cycle before material selection.
2
Material and process route
Match isostatic graphite grade, purification depth, coating route, and machining allowance to the process risk.
3
Precision manufacturing
Machine graphite bodies, lids, rings, heaters, carriers, and insulation interfaces against the approved drawing pack.
4
Inspection and export readiness
Align dimensional checks, purity report format, cleaning, vacuum sealing, cushioning, and crate requirements before shipment.

Evidence Buyers Can Request

Graphite grade, density, and material batch confirmation
Ash, impurity, or coating report format aligned before sample approval
Critical OD, ID, thickness, thread, groove, and flatness checks
Cleaning, vacuum sealing, cushioning, and export crate plan for brittle graphite parts

Claim Boundaries

Ash limits, density windows, coating scope, and tolerance claims are confirmed by RFQ, material grade, geometry, and inspection method.
Service-life, equipment-fit, and semiconductor-process suitability should be validated in the buyer furnace before repeat production.
Certification or compliance documents are listed in the quotation package when available; they are not implied by catalog copy.