石墨高温粘接部件的抗热震性能研究

STUDY ON THE THERMAL SHOCK RESISTANCE OF GRAPHITE COMPONENTS BONDED WITH HIGH TEMPERATURE ADHESIVES

以酚醛树脂 (Phenol FormaldehydeResin ,PF)和B4 C、SiO2 为原料制备了高温粘结剂 ,并对石墨材料进行高温粘接 ,同时考察了粘接石墨制品经历ΔT =80 0℃和ΔT =10 0 0℃温度交变后的抗热震性能。结果表明 ,用该粘结剂粘接的石墨样品有着优良的抗热震性能 ,经历数次热震后其强度保持率仍然较高。此外 ,还对影响粘接样品抗热震性能的因素进行了理论探讨 ,指出优化原料性质、提高热处理温度。

A high temperature adhesive (HTA) was prepared using Phenol-Formaldehyde Resin (PF) as matrix and ceramic powers as additives to modify the performance. The graphite materials were bonded and treated at 800 degreesC, 1000 degreesC, and 1200 degreesC and the thermal shock resistance experiments were carried out. The critical thermal shock temperatures were 800 degreesC and 1000 degreesC. Results of shear strength test showed that the graphite components bonded with the above HTA had satisfactory thermal shock resistance. The percentage of retained strength was high even after the bonded samples had experienced several thermal shock experiments. In addition, the factors that influenced the thermal shock resistance are also discussed, and some suggestions for enhancing the thermal shock resistance, such as optimizing the composition of HTA, increasing heat-treatment temperature and controlling the cement thickness are discussed.