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Evaluation of changes in physical properties of low thermal expansion ceramics and glass induced by radiation

机译：评估辐射引起的低热膨胀陶瓷和玻璃的物理性能变化

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Cordierite ceramics have excellent physical properties such as a high elastic modulus, low bulk density, high thermal conductivity and low coefficient of thermal expansion (CTE). These features make cordierite ceramics attractive materials for ultra-lightweight and thermally-stable components used in changing thermal environments. Thus, cordierite ceramics have been widely used in ground-based precision systems, but have not yet been applied to space missions. Their resistance against the space environment must first be demonstrated in order to apply these materials to space missions. One of the main issues in the space environment is the deterioration of materials induced by space radiation. The electrons and protons trapped around Earth and having energies of several MeV to tens of MeV cause ionization inside materials. Long-term radiation exposure may induce changes in physical properties, leading to degraded performance. This study evaluated two cordierite ceramics and a SiAlON ceramic for the changes in key physical properties (i.e. Young's modulus, CTE) induced by radiation as compared with traditional low CTE glass materials. The irradiation test conditions of 10 MeV energy and 2.5×10~(16) /cm~2 total fluence were set by assuming the worst-case condition for operation on geostationary orbit (GEO) over a 20-year period. The total fluence was irradiated in several divided doses, and the changes in physical properties were evaluated relative to increases in irradiation dose. As a characteristic result, the cordierite ceramics showed virtually no changes in terms of Young's modulus and CTE, while all the compared glass materials gradually showed an increase in CTE in line with increases in irradiation dose. This result indicates that the cordierite ceramics have superior radiation resistance in terms of the stability of physical properties as compared to the low CTE glass materials.
机译：堇青石陶瓷具有优异的物理性质，例如高弹性模量，低堆积密度，高导热率和低热膨胀系数（CTE）。这些功能使堇青石陶瓷用于超轻的超轻和热稳定部件用于改变热环境的含量材料。因此，堇青石陶瓷已广泛用于基于地面的精密系统，但尚未应用于太空任务。首先必须首先对空间环境进行抵抗，以将这些材料应用于太空任务。空间环境中的主要问题之一是空间辐射引起的材料的恶化。在地球周围捕获的电子和质子和几十MeV的能量导致材料内部材料。长期辐射暴露可能会诱导物理性质的变化，导致性能降低。该研究评估了辐射诱导的关键物理特性（即杨氏模量，CTE）的变化的两种堇青石陶瓷和唾液陶瓷，与传统的低CTE玻璃材料相比。通过假设在20年内的地球静止轨道（GEO）上的最坏情况条件下，设定了10meV能量和2.5×10〜（16）/ cm〜2的辐照测试条件。在几种分开剂量中照射总量，相对于辐照剂量的增加，评估物理性质的变化。作为一种特征的结果，堇青石陶瓷在杨氏模量和CTE方面表现得几乎没有变化，而所有比较的玻璃材料逐渐逐渐显示CTE的增加，随着辐照剂量的增加。该结果表明，与低CTE玻璃材料相比，堇青石陶瓷在物理性质的稳定性方面具有卓越的辐射阻力。

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