High-Purity Graphite Heater

Name: High-Purity Graphite Heater
Brand: SiC Graphite
SKU: high-purity-graphite-heater
Availability: InStock
Rating: 4.9 (24 reviews)

Custom-machined graphite heating elements for semiconductor furnaces. Delivering uniform thermal profiles and extended lifespan in harsh vacuum and inert gas environments.

Target Buyer:Furnace builders and maintenance engineering teams.

High-purity graphite heater for vacuum furnace hot zones 1

Capability Highlights

Uniform electrical resistivity
High mechanical strength at high temperatures
Custom geometries based on thermal modeling

Typical Applications

SiC Crystal Growth Furnaces
MOCVD Reactors
Vacuum High-Temperature Furnaces

Engineering Focus

Electrical resistivity matching
Wall thickness consistency
Thermal expansion compatibility

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Resistivity Variance	< 5%	Ensures uniform heating zone.
Graphite Grade	Isostatic or fine-grain graphite by load and geometry	Grade selection controls strength, machinability, resistivity, and hot-zone life.
Machining Tolerance	+/-0.01 mm to +/-0.10 mm by feature	Assembly interfaces, heater slots, and shield gaps need different inspection levels.
Atmosphere Fit	Vacuum or inert gas, oxidation risk reviewed separately	Graphite performs best when oxygen exposure and cleaning chemistry are controlled.

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
Heater geometry	Ring, plate, rod, barrel, strip, spiral, or drawing-defined element by furnace design	Heater shape, cross-section, and slot pattern determine resistance, hot spots, and installation clearance.
Electrical resistance	Buyer-defined resistance, voltage, current, power, and allowable tolerance	A replacement heater must match both electrical target and mechanical interface.
Graphite grade	High-purity graphite selected by resistivity, density, strength, and thermal shock resistance	Grade selection should be tied to power layout and atmosphere, not only machining availability.
Operating environment	Vacuum, inert, or crystal-growth hot-zone review by maximum temperature and ramp cycle	Oxygen leaks, vapor exposure, and fast thermal cycling are the main life risks for graphite heaters.
Connection interface	Terminal holes, slots, threaded connections, clamp areas, and contact faces by drawing	Poor contact or sharp corners can create local overheating and premature cracking.
Matched set control	Resistance and dimensional matching across multi-element heater sets	Set-level matching is important where uniform thermal field matters more than single-part replacement.

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
Ash content	High-purity or semiconductor-grade target by furnace process	Heaters sit inside the hot zone and can become a contamination source at high temperature.
Electrical resistivity variance	Buyer-defined matching tolerance for heater sets	Resistivity variation can create thermal imbalance and shorten heater life.
Surface dust / edge chips	Visual acceptance and clean handling route required	Machining debris can contaminate the furnace and create installation problems at electrical contact points.
Oxidation exposure	Vacuum / inert baseline; air-leak risk reviewed by process	Graphite heater life drops quickly when oxygen or moisture exposure is uncontrolled.

RFQ Evidence Package

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

Heater drawing with cross-section, slot pattern, terminal geometry, hole positions, and contact surfaces.
Electrical target sheet covering resistance, voltage, current, power, and set-matching tolerance.
Graphite grade and purification route selected for resistivity, strength, purity, and thermal shock risk.
Dimensional and resistance inspection report for first-article or matched heater sets.
Packing photos protecting thin heater sections, terminal faces, and labeled matched-set positions.

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 and crystal-growth furnaces	Graphite heaters, heater rings, strips, terminals, and matched hot-zone heating sets.	Confirm power supply, resistance target, hot-zone geometry, growth temperature, atmosphere, and replacement failure mode.
High-temperature vacuum furnaces	Graphite heater elements, connector blocks, shields, and replacement heating hardware.	Confirm voltage, current, chamber clearance, mounting points, ramp cycle, and current heater drawings.
MOCVD and semiconductor thermal processing	Custom graphite heating parts where purity, geometry, and thermal uniformity are CTQ.	Confirm process gas exposure, purity target, contact interface, inspection scope, and clean packing requirement.

Open full OEM compatibility matrix

Product Selection Logic

Decision Factor	Selection Logic	Buyer Check
Heat generation or shielding role	Heaters need resistivity and wall-section control; shields and supports need stability and fit.	Separate electrical, thermal, and mechanical CTQ features on the drawing.
Assembly interface	Graphite hot-zone parts should be selected as a matched assembly when gaps affect heat loss or arcing risk.	Provide chamber size, mating parts, power supply, and installation clearances.
Atmosphere exposure	Vacuum and inert gas are baseline; oxygen, water vapor, or aggressive cleaning steps require extra review.	Define atmosphere, ramp rate, cleaning method, and maximum temperature.

Manufacturing and QC Flow

Stage	Production / QC Checkpoint	Buyer Evidence
1. Assembly review	Map heater, shield, insulation, support, and chamber interfaces before quoting.	Hot-zone layout, mating-part drawings, power data, and atmosphere notes.
2. Material routing	Select graphite grade by resistivity, strength, machinability, and cost target.	Grade recommendation and risk notes for high-stress or high-current features.
3. Machining control	Control wall thickness, slots, bolt holes, shield gaps, and fragile edges.	Dimensional report for assembly and electrical CTQ features.
4. Fit and surface check	Inspect cracks, chips, surface finish, and installation-critical dimensions.	Visual and dimensional acceptance record.
5. Export protection	Pack heaters, shields, rings, and hot-zone parts against vibration and edge damage.	Foam-nest or crate plan for fragile assemblies.

RFQ Checklist

Provide CAD drawings
Specify operating voltage/current
Define maximum operating temperature
Identify working atmosphere

Risk Controls

Hot spots causing premature failure: Strict material density and resistivity screening.

Product Gallery

High-purity graphite heater for vacuum furnace hot zones 2

High-purity graphite heater for vacuum furnace hot zones 3

High-purity graphite heater for vacuum furnace hot zones 4

High-purity graphite heater for vacuum furnace hot zones 5

High-purity graphite heater for vacuum furnace hot zones 6

Custom graphite heating element for semiconductor furnace

Buyer FAQ

Can you match our existing heater resistance?

Yes, we select graphite grades and machine to precise cross-sections to match target resistance.

How do buyers avoid wrong graphite grade selection?

Share the process role of the part, not only the drawing. Heating, shielding, support, and insulation interfaces require different graphite properties and inspection focus.

Can a hot-zone part be quoted from a worn sample?

Yes, but a worn sample should be paired with chamber dimensions, mating-part photos, and operating conditions so reverse engineering does not copy wear damage.

What inspection evidence is practical for graphite hot-zone parts?

Most programs use dimensional reports for CTQ features, visual inspection for chips or cracks, and packing photos for fragile export shipments.

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.

Inquiry Email

[email protected]

Email app

Include process, product type, drawing status, purity/coating target, dimensions, quantity forecast, operating conditions, and delivery date.

Instant Chat

+8618857971991

Chat on WhatsApp

Best for quick drawing checks, process fit questions, and RFQ clarification.