Graphitization Degree Testing: XRD, Raman, and Conductivity
Graphitization degree is a core indicator for evaluating the graphitization effect, but how to measure it? Three commonly used methods each have their advantages and disadvantages and are suitable for different scenarios.
Principle: By measuring the diffraction peak positions of the (002) crystal plane of carbon materials, the d002 value is calculated and compared with the 3.354 ? of ideal graphite to calculate the graphitization degree.
Internationally recognized as the most authoritative method, reliable results, and traceable.
Requires sampling and testing; cannot be monitored online in real time; expensive equipment and long testing cycle.
What the source article emphasizes
The Chinese source focuses on practical furnace selection and operation, not on a simple word-for-word product description. The important point is to understand how each specification affects real batch quality, operating cost, maintenance, and safety.
- X-ray Diffraction (XRD) Method
- Conductivity Method
Key technical points
- Temperature measurement at graphitization temperatures requires a practical combination of sensor selection, calibration, and indirect verification.
- Thermocouples, infrared systems, and ceramic rings each have different suitable ranges and limitations.
- Calibration should be treated as routine quality work, not only a commissioning formality.
- Acceptance criteria should be measurable and written into the contract before manufacturing is completed.
- Site readiness, utilities, lifting, foundation, gas supply, cooling water, and exhaust treatment all affect commissioning.
- Trial production data is more useful than a simple no-load running record.
- Confirm the process temperature, holding time, atmosphere, loading volume, and product quality indicators before comparing suppliers.
- Ask which indicators will be tested at the factory, which will be tested on site, and which need production verification.
Engineering interpretation for overseas buyers
R&D stage, quality inspection, customer acceptance.
The degree of graphitization is assessed by measuring the intensity ratio Id/Ig of the D peak (defect peak) and the G peak (graphite peak). The smaller the Id/Ig ratio, the higher the degree of graphitization.
Advantages: Fast (results in minutes), non-destructive (no sample damage required), portable equipment
Disadvantages: It is a semi-quantitative method and requires calibration with XRD results for accurate conversion
For an English industrial furnace website, this topic should be presented in a way that helps the reader make a specification decision. That means connecting the furnace feature with material behavior, production rhythm, utility conditions, acceptance testing, and long-term maintenance.
Specification and acceptance checklist
- Temperature measurement at graphitization temperatures requires a practical combination of sensor selection, calibration, and indirect verification.
- Thermocouples, infrared systems, and ceramic rings each have different suitable ranges and limitations.
- Calibration should be treated as routine quality work, not only a commissioning formality.
- Acceptance criteria should be measurable and written into the contract before manufacturing is completed.
- Site readiness, utilities, lifting, foundation, gas supply, cooling water, and exhaust treatment all affect commissioning.
- Trial production data is more useful than a simple no-load running record.
- Confirm the process temperature, holding time, atmosphere, loading volume, and product quality indicators before comparing suppliers.
- Ask which indicators will be tested at the factory, which will be tested on site, and which need production verification.
Questions to confirm before ordering
- What material will be treated, and what quality indicators must be reached after graphitization?
- What temperature curve, holding time, atmosphere, vacuum level, cooling method, and loading density are required?
- Which data will be recorded for each batch, and which acceptance tests will prove stable performance?
- Which spare parts, consumables, alarms, and maintenance checks are needed for long-term operation?
Engineering takeaway
A graphitization furnace should be specified as a complete high-temperature process system. When the buyer defines the material, process window, utilities, safety logic, and acceptance method clearly, the furnace is easier to operate, easier to troubleshoot, and more reliable in repeated production.
