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Recrystallization of compacted gold foil specimens.

D D Schloyer, P G Winchell, R W Phillips

    Journal of Dental Research
    |May 1, 1977
    PubMed
    Summary

    This study looked at how compacted gold foil specimens behave when heated. Researchers tracked changes in hardness, grain size, and X-ray patterns to understand recrystallization. They found that the process is temperature-dependent, with higher temperatures speeding up recrystallization. An empirical formula was developed to predict how long the process takes at different temperatures. The results suggest that compacted gold remains stable for a long time under normal conditions, which is useful for dental applications.

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    Area of Science:

    • Materials science
    • Metallurgy
    • Recrystallization kinetics

    Background:

    Gold foil specimens are often studied for their mechanical and thermal properties. Prior research has shown that compacting techniques influence material behavior. However, the specific recrystallization processes in compacted gold remain unclear. No prior work had resolved the exact temperature-time relationship for this transformation. This gap motivated a closer look at how compaction affects recrystallization. The need to understand recrystallization in dental materials is growing. Existing studies focus on broader material categories. This paper's contribution lies in its detailed thermal analysis of compacted gold.

    Purpose Of The Study:

    The aim of this study was to investigate how compacted gold foil specimens behave during recrystallization. Researchers wanted to track changes in hardness and grain size. They focused on the temperature range from 100 to 300 C. The goal was to determine the empirical relationship between time and temperature. Understanding this could improve dental restoration techniques. The study sought to clarify the kinetics of recrystallization. It aimed to provide data on how long the process takes. The findings may help in optimizing material preparation methods.

    Keywords:
    recrystallizationgold foilmaterials analysisdental restorationtemperature dependence

    Frequently Asked Questions

    The main finding is an empirical formula linking recrystallization time to temperature, predicting times exceeding 100 years at lower temperatures.

    Researchers monitored hardness, grain size changes, and X-ray line broadening to track recrystallization progress.

    This range is where recrystallization occurs, with observable changes in material properties and measurable time-temperature relationships.

    X-ray line broadening indicates structural changes during recrystallization, helping to confirm the process's progression.

    Related Experiment Videos

    Main Methods:

    Gold foil specimens were compacted using dental restoration techniques. Recrystallization was monitored through hardness measurements. Grain size changes were recorded as a key indicator. X-ray line broadening was used to track structural changes. The process was repeated at various temperatures. Data was collected over a wide temperature range. The empirical formula was derived from the collected data. The analysis focused on the 50% recrystallization point.

    Main Results:

    Recrystallization in compacted gold was observed between 100 and 300 C. Hardness decreased as recrystallization progressed. Grain size increased in a discontinuous manner. X-ray line broadening decreased with time. The empirical formula log10 t = -12.3 + 6.5 × 1,000/T was derived. At lower temperatures, the process took longer. The formula predicted recrystallization times exceeding 100 years. These findings suggest a strong temperature dependence.

    Conclusions:

    The study confirmed that compacted gold undergoes recrystallization. The process is temperature-dependent, with higher temperatures speeding up the reaction. The empirical formula provides a useful model for predicting recrystallization times. The findings may help in optimizing dental restoration practices. The observed changes in hardness and grain size were consistent. The X-ray data supported the recrystallization hypothesis. The long recrystallization times suggest practical applications. The results align with the authors' initial hypotheses.

    Long recrystallization times suggest that compacted gold remains stable under normal conditions, which is important for dental applications.

    The formula log10 t = -12.3 + 6.5 × 1,000/T allows prediction of recrystallization times based on temperature, aiding material optimization.