How to test the seismic resistance of refractory bricks

(1) Heating and cooling method. Place a sample of a certain size directly into a furnace that has reached the specified temperature for a specified period of time, then quickly remove it from the furnace and quench it in a medium such as water or air. Repeat the above process until the specified number of thermal shock cycles is reached, observe the damage of the sample, or measure the retention rate of flexural strength before and after thermal shock to determine the quality of the material's thermal shock resistance.

(2) Panel method. The panel method is to lay a refractory brick sample on the furnace wall or door, allowing it to undergo a heating and cooling cycle while being heated on one side. In the current standard in our country, the refractory brick sample is laid on the door of the test furnace. After the door is closed, one end of the sample is heated in the furnace. After reaching the specified time, the door is flipped over and the hot refractory brick end is inserted into cold water for cooling. After several repetitions, the thermal shock resistance of refractory bricks is measured by the damage rate of the heated end area. The actual measurement process needs to be carried out according to the procedures specified in the relevant standards.

(3) Long strip method. Place the rectangular refractory brick sample on the support, with * * * burner and blowing nozzle under the heating surface of the sample. First, heat the sample with * * * for the specified time, and then cool it with a hair dryer for a period of time. After repeated several times according to regulations, the retention rate of flexural strength or elastic modulus of refractory brick samples before and after thermal shock is measured to evaluate their thermal shock resistance. Compared with the general heating and cooling method, both use long strip samples. The difference is that in the long strip method, single-sided heating is used, and there is a certain temperature gradient in the sample during the heating and cooling process.