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<p>Talc’s high-temperature behavior—dehydroxylation, phase transitions, and sintering—dictates its performance in ceramics, polymers, cosmetics, and pharmaceuticals. Push-rod dilatometry, encompassing thermodilatometry and derivative thermodilatometry (TD/DTD), can resolve these processes with greater sensitivity than conventional thermogravimetry, yet systematic studies of how sample and test parameters bias its measurements are scarce. Here, a NETZSCH DIL 402&#xa0;PC dilatometer was used to examine Haicheng talc, evaluating the effects of sample morphology, geometry, and particle size, alongside baseline correction, heating rate, and gas flow. TD/DTD curves reveal five discrete transformation stages between 30 and 1250&#xa0;°C, highlighting the method’s ability to dissect complex mineral reactions. Key findings include: (1) Sample morphology as the dominant factor—solid talc exhibits an expansion coefficient roughly one-third that of powdered talc and produces more distinct DTD peaks; (2) sample geometry impacts results variably—lengthening samples (5–8&#xa0;mm) decreases expansion coefficients but influences sintering differently in solid and powder forms, while enlarging cross-sectional area (5 × 3–5 × 7&#xa0;mm) raises solid talc’s expansion coefficient by about 60%; (3) finer particle sizes correspond to increased expansion and sintering shrinkage; (4) among testing parameters, baseline correction introduces up to 20% variation in expansion coefficients, heating rate significantly shifts transformation kinetics, whereas gas flow rate effects are minimal. This multi-factorial analysis advances understanding of talc’s high-temperature behavior and provides essential guidance for optimizing thermal processing conditions. The results also contribute valuable standards for applying and interpreting dilatometry in mineralogy and materials science.</p>

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Thermal expansion behavior of talc: parameter-driven insights from dilatometry

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Huan Yang,
  • Qin Liu,
  • Xianghui Zhang,
  • Wenling Yang,
  • Xinyu Li,
  • Wei Hu,
  • Kaining Cao,
  • Shan Liu,
  • Ling Wang,
  • Qian Feng

摘要

Talc’s high-temperature behavior—dehydroxylation, phase transitions, and sintering—dictates its performance in ceramics, polymers, cosmetics, and pharmaceuticals. Push-rod dilatometry, encompassing thermodilatometry and derivative thermodilatometry (TD/DTD), can resolve these processes with greater sensitivity than conventional thermogravimetry, yet systematic studies of how sample and test parameters bias its measurements are scarce. Here, a NETZSCH DIL 402 PC dilatometer was used to examine Haicheng talc, evaluating the effects of sample morphology, geometry, and particle size, alongside baseline correction, heating rate, and gas flow. TD/DTD curves reveal five discrete transformation stages between 30 and 1250 °C, highlighting the method’s ability to dissect complex mineral reactions. Key findings include: (1) Sample morphology as the dominant factor—solid talc exhibits an expansion coefficient roughly one-third that of powdered talc and produces more distinct DTD peaks; (2) sample geometry impacts results variably—lengthening samples (5–8 mm) decreases expansion coefficients but influences sintering differently in solid and powder forms, while enlarging cross-sectional area (5 × 3–5 × 7 mm) raises solid talc’s expansion coefficient by about 60%; (3) finer particle sizes correspond to increased expansion and sintering shrinkage; (4) among testing parameters, baseline correction introduces up to 20% variation in expansion coefficients, heating rate significantly shifts transformation kinetics, whereas gas flow rate effects are minimal. This multi-factorial analysis advances understanding of talc’s high-temperature behavior and provides essential guidance for optimizing thermal processing conditions. The results also contribute valuable standards for applying and interpreting dilatometry in mineralogy and materials science.