Abstract A series of high-temperature resistant aluminum (Al) phosphate (P) adhesives with different Al:P ratios were prepared using Si as the sole additive. The influence of Al:P ratio on the temperature-dependent composition and structural evolution of the adhesives and their bonding performance were systematically analyzed. The conversion of aluminum metaphosphate to aluminum orthophosphate during the heating process from 700 °C to 900 °C decreased with increasing Al:P ratio, which reduced the generation of micro cracks inside the adhesive. Higher Al:P ratios (≥1:1) were favorable for the generation of alumina, which then reacted with silicon oxide to form mullite phase at high temperatures. No mullite phase was generated for Al:P ratios lower than 1. Accordingly, increasing Al:P ratio effectively improved the bonding performance and thermal shock resistance of the adhesive. The bonding strength of adhesive with an Al:P ratio of 1:0.85 after calcination at 1300 °C was 35.7% and 112%, respectively, higher than those of adhesives with Al:P ratios of 4:5 and 1:2. Besides, the retention rates of their bonding strength were 48.8%, 28.6% and 7.9%, respectively, after 15 thermal shocks based on air-cooling from 1300 °C to RT.

中文翻译：

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Al:P比对耐高温磷酸铝胶粘接性能的影响

摘要 以Si为唯一添加剂，制备了一系列不同Al:P比的耐高温磷酸铝(Al)(Al)(P)胶粘剂。系统地分析了Al:P比例对粘合剂的温度依赖性组成和结构演变及其粘合性能的影响。在从 700°C 到 900°C 的加热过程中，偏磷酸铝向正磷酸铝的转化率随着 Al:P 比的增加而降低，从而减少了粘合剂内部微裂纹的产生。较高的 Al:P 比 (≥1:1) 有利于生成氧化铝，然后在高温下与氧化硅反应形成莫来石相。Al:P 比率低于 1 时不会产生莫来石相。因此，增加 Al：P比有效提高了胶粘剂的粘接性能和抗热震性。Al:P 比为 1:0.85 的胶粘剂在 1300 °C 煅烧后的结合强度分别比 Al:P 比为 4:5 和 1:2 的胶粘剂高 35.7% 和 112%。此外，从1300℃空冷至室温，经过15次热冲击后，其结合强度的保持率分别为48.8%、28.6%和7.9%。