Under high temperature conditions, the isothermal deformation of fused zirconium corundum bricks under stress over time is called the high temperature creep of fused zirconium corundum bricks. Due to the different external forces fused zirconium corundum bricks bear, they can be divided into high temperature compression creep, high temperature tensile creep, high temperature bending creep and high temperature torsion creep. Among them, the creep property often measured is compression creep, expressed in "%". Its determination method is the compression creep test method of fused zirconium corundum bricks specified in the national standard GB-5073-85.
When measuring compression creep, attention should be paid to the preparation of the sample. The sample should be drilled at any corner of the fused zirconium corundum brick, and the axis of the cylindrical fused zirconium corundum brick should be consistent with its forming and pressurizing direction. The sample should not have defects such as missing edges and cracks. The top and bottom surfaces of the sample are flat and parallel to each other, and the height difference between any two points of the sample shall not be greater than 0.2mm. The upper and lower planes of the sample should be perpendicular to the side. Its verticality is checked with a square, and the gap between the side of the sample and the square shall not be greater than 0.4mm.
The calculation formula of compressive creep rate is as follows:
P (%) = (Ln-Lo) / Li × 100
Where P—creep rate, %;
Li—original height of the sample, mm;
Lo—height of the sample at the beginning of constant temperature, mm;
Ln—height of the sample after constant temperature for n hours, mm.
Wechat Us 
