Oxygen in Aluminum and Aluminum Alloys (TC600-Series)

Importance of the Topic

Accurate determination of oxygen content in aluminum and its alloys is essential for quality control in wire manufacturing and semiconductor target production. Oxygen exists as insoluble aluminum oxide particles that act as electrical insulators. In electrical wire, higher oxygen levels reduce conductivity. In sputtering targets for integrated circuits, oxygen contamination lowers device yield.

Objectives and Overview of the Study

This application note describes a semi-automated inert-gas fusion method for oxygen analysis in solid aluminum samples. It outlines sample preparation, instrument parameters, calibration, blank determination, and routine analysis steps using a LECO TC600-Series analyzer.

Methodology and Instrumentation

Sample Preparation

• Machine or file the sample surface to remove oxides and contaminants.
• Rinse with acetone and dry with warm air; analyze immediately.

Instrumentation Used

• LECO TC600-Series inert-gas fusion analyzer.
• 776-247 graphite crucible; 611-351-182 electrode tip.
• Consumables: 501-073 graphite powder, 761-739 tin pellet, 501-263 copper chip.

Furnace Parameters

• Purge: 15 s; Outgas: 15 s; Outgas cool: 5 s.
• Outgas power: 6 kW; Analysis power: 5 kW.
• No ramping; sample prep power off.

Main Results and Discussion

Typical results for aluminum rod and disc samples showed oxygen levels around 8–10 ppm for rods and 15–20 ppm for discs, with standard deviations of about 1–2 ppm. The method provided reproducible oxygen measurements with sufficient precision for process control.

Benefits and Practical Applications of the Method

• Rapid semi-automated analysis of small solid samples.
• High sensitivity and reproducibility (±1–2 ppm O).
• Direct applicability for wire producers and sputtering target manufacturers to monitor and minimize oxygen content.

Future Trends and Potential Applications

Advances may include fully automated sampling, improved reference materials for aluminum-specific calibration, and integration with in-line process monitoring. Development of low-oxygen aluminum alloys and real-time quality feedback loops will enhance production efficiency.

Conclusion

The described inert-gas fusion approach on the LECO TC600-Series provides a robust, precise, and practical solution for oxygen determination in aluminum and its alloys. Consistent sample preparation, proper calibration, and adherence to instrument parameters ensure reliable quality control results.

References

LECO Corporation Application Note 203-821-185: Analysis of Reactive/Refractory Metals
LECO Corporation Form No. 203-821-363 (July 2009)