The synchronous thermal analyzer (STA) combined with thermogravimetric analysis (TG) and differential scanning calorimetry (DSC/DTA) technology can monitor the quality changes and thermal effects of materials in real-time during programmed temperature control, providing key data support for metal oxidation kinetics research and ceramic sintering process optimization.
1. Research on metal oxidation behavior
STA accurately records the mass increase of metal samples in high-temperature oxidation environments (such as air or oxygen) through the TG module, and combines DSC detection of oxidation exothermic peaks to quantify oxidation reaction kinetic parameters. For example:
Oxidation rate analysis: Calculate the oxidation weight gain rate through isothermal or non isothermal TG curves, establish the Arrhenius equation, and determine the activation energy (Ea) and reaction order;
Evaluation of oxide film characteristics: multi-stage quality changes reflect the growth, rupture, and repair process of oxide films, such as the formation of Cr ₂ O ∝ protective film on stainless steel at 600-900 ℃;
Alloy oxidation mechanism: Distinguish between selective oxidation (such as preferential formation of Al ₂ O3) or mixed oxidation behavior by the correspondence between the DSC exothermic peak position and the TG weight gain step.
2. Optimization of ceramic sintering process
The application of STA in ceramic material sintering focuses on phase transformation, densification, and the influence of additives:
Determination of sintering starting temperature: DSC endothermic peak (such as hydroxyl removal) and exothermic peak (crystal phase formation) combined with TG weight loss step to determine the optimal sintering window;
Analysis of additive effects: Comparing the TG-DSC curves of pure ceramics and doped systems, revealing the influence of sintering aids (such as MgO, Y ₂ O ∝) on the liquid phase formation temperature;
Contraction behavior correlation: STA data is combined with a thermal expansion analyzer (TMA) to establish a coupled model of mass loss thermal effect size change, which guides the design of sintering curves.
3. Technical advantages and case studies
Expansion of Combined Technologies: STA-MS (Mass Spectrometry) can synchronously analyze gas products (such as CO ₂, H ₂ O) during oxidation or sintering processes, for the study of decomposition mechanisms of ceramic precursors;
Practical application case: A study found through STA that Al ₂ O ∝ - ZrO2 composite material exhibited an abnormal exothermic peak at 1400 ℃, which was verified by XRD as a transformation from tetragonal ZrO ₂ to monoclinic phase. After optimization, the sintering temperature was reduced by 50 ℃.
Conclusion
The high-throughput and multi parameter synchronous detection capability of STA makes it a core tool for the development of metal oxide protective materials and the optimization of ceramic sintering processes. In the future, the combination of artificial intelligence data analysis and high-pressure STA technology will further promote the precision of high-temperature material research.