Since the ceramic filter itself is subjected to internal pressure, external pressure, compression, stretching and other forces, strength is one of the important characteristics. In addition, when used at high temperatures (700 to 1000 ° C), the filter does not cause softening and strength reduction after heating. This is a very important characteristic. Although the strength is affected by many factors such as aggregate quality, aggregate particle size, binder quality and mixing ratio, it is mainly related to aggregate strength and bond layer strength. For example, the strength order of various materials commonly used as bone (aggregate) particles is:
SiC, Al2O3> mullite> ceramic particles> silica sand, carbon particles
Although the strength of the bonding layer mainly depends on the binder and the firing conditions (temperature and atmosphere), adjusting the coefficient of thermal expansion of the binder and the aggregate (aggregate) to ensure the adhesion of the binder and aggregate Important (ie, the coefficient of thermal expansion and the bonding force are also important factors affecting the strength of the bonding layer).
