超高温陶瓷复合材料抗热冲击性能影响因素的实验研究

Experimental study on the influential factors of thermal shock resistance of ultra-high temperature ceramic composite materials

为研究超高温陶瓷复合材料抗热冲击性能的影响因素,自行搭建多参数导电类热防护材料热冲击测试装置,测试导电类材料表面温度响应、升温速率、尺寸效应、压力及气体组分对其抗热冲击性能的影响。针对ZrB2-SiC-石墨(ZSG)典型超高温陶瓷复合材料,通过正交实验获得不同参数下热冲击实验后材料的剩余弯曲强度,并利用极差、方差分析各参数对抗热冲击性能的影响权重及显著性,结果表明表面温度响应,升温速率和尺寸效应具有显著影响,压力和气体组分影响甚微。

In order to study the factors affecting thermal shock resistance of ultra-high temperature ceramic composite materials, a home-made multiparameter thermal shock testing device for conducting thermal protection materials was established to test the impact of factors, such as surface temperature response, the rate of temperature rising, dimensional effect, pressure and gas component of conductive materials, on the thermal shock resistance property. Based on high temperature ceramic material, ZrB2-SiC- graphite （ZSG） for typical, the residual bending strength of specimens was tested after the thermal shock test by the orthogonally designed experiments under different parameters. Then the thermal shock property was analyzed by using range and variance methods to evaluate the weight and significance of the parameters. Results show that the influences of surface temperature response, the rate of temperature rising and dimensional effect are remarkable, while pressure and gas component have little effects.