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<p>The thermal decomposition and metal-driving performance of four HMX/RDX-based PBXs with varying Al/TiH<sub>2</sub> ratios (0–8 mass% TiH<sub>2</sub>) were investigated. While TiH<sub>2</sub> addition increased particle roughness, it altered the decomposition kinetics from a first-order model to a complex function described as (− ln(1 − α))<sup>2</sup>. Although the onset decomposition temperature dropped notably, the critical Self-Accelerating Decomposition Temperature (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({T}_\text{SADT}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mtext>SADT</mtext> </msub> </math></EquationSource> </InlineEquation>) showed only a marginal reduction, suggesting that macroscopic thermal safety remains manageable. Cylinder tests revealed that within the investigated range, the 4 mass% TiH<sub>2</sub> formulation (RHTL-1) enhanced the wall velocity and Gurney coefficient by 5% and 3.6% during the early expansion phase (15–30&#xa0;μs), whereas higher loadings (8 mass%) shifted energy release to later stages. Consequently, comparing the metallized formulations, 4 mass% TiH<sub>2</sub> offers the most favorable trade-off between early metal-drive capability and energy release characteristics.</p>

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Study on the influence of TiH2‑doped aluminum powder on the thermal decomposition and metal‑driving performance of HMX/RDX‑based PBX explosives

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Xiwei Xing,
  • Shaohua Jin,
  • Kun Chen,
  • Junfeng Wang

摘要

The thermal decomposition and metal-driving performance of four HMX/RDX-based PBXs with varying Al/TiH2 ratios (0–8 mass% TiH2) were investigated. While TiH2 addition increased particle roughness, it altered the decomposition kinetics from a first-order model to a complex function described as (− ln(1 − α))2. Although the onset decomposition temperature dropped notably, the critical Self-Accelerating Decomposition Temperature ( \({T}_\text{SADT}\) T SADT ) showed only a marginal reduction, suggesting that macroscopic thermal safety remains manageable. Cylinder tests revealed that within the investigated range, the 4 mass% TiH2 formulation (RHTL-1) enhanced the wall velocity and Gurney coefficient by 5% and 3.6% during the early expansion phase (15–30 μs), whereas higher loadings (8 mass%) shifted energy release to later stages. Consequently, comparing the metallized formulations, 4 mass% TiH2 offers the most favorable trade-off between early metal-drive capability and energy release characteristics.