High temperature creep of zirconia ceramics that you are not aware of

When zirconia ceramic material is subjected to a constant load below its limit at high temperatures, plastic deformation occurs, and the amount of deformation gradually increases with time, even causing damage to the zirconia ceramic material. This phenomenon is called creep. Therefore, for zirconia ceramic materials at high temperatures, their strength cannot be considered in isolation, and temperature and time factors should be considered simultaneously with strength.

For example, the damage to the grid bricks of a hot air stove that has been working at high temperatures for a long time is due to

The gradual softening of the brick body results in plastic deformation, significant decrease in strength, and even failure. This creep phenomenon of the checkered brick becomes the main cause of furnace damage.

It is generally believed that the factors affecting high-temperature creep of zirconia ceramic parts include:

1) Usage conditions, such as temperature and load, time, atmosphere properties, etc;

2) Materials, such as chemical composition and minerals;

3) Microstructure. The high-temperature creep curve of the material is divided into three stages, with the first stage of creep being deceleration creep (with a short duration); The second stage is uniform creep (with low creep rate); The third stage is accelerated creep (rapid increase in creep rate).

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