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It is easy to produce micro-cracks at the junction of two phases(white corundum), on the other hand, and the mechanism of improving thermal shock resistance is micro-crack toughening tree. Compared with sample A, the chemical composition of sample A contains Si, Al, Mg, Ca, O, and Zr. And the strength retention rate of sample A after thermal shock is somewhat lower than that of sample A(brown aluminium oxide 24 mesh), that is, thermal shock stability is poor.

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This is related to the anchor stone introduced in sample A, which is at high temperature. Free SiO2 is decomposed under low temperature(white fused alumina price). Among them, SiO2 combines with Al203 at medium and high temperature (1200~1500℃) to form mullite. As the heat treatment temperature increases, the mullite phase increases(aluminium oxide 36 grit), and the volume expansion is too large, causing more cracks. The emergence of, resulting in a decrease in strength.

(cheapest white corundum wholesale price australia)The low-temperature phase has a monoclinic crystal structure (m-ZrO2), the tetragonal phase -Z403 is gradually formed when the temperature is higher than 1000℃(white aluminum oxide), and the cubic crystal phase (c-ZrO2) is formed when the temperature is higher than 2370℃, and the monoclinic oxidation anchor (m-ZrO2) and The phase transition between tetragonal zirconium oxide (1-ZrO2) is called the martensitic phase transition of ZrO2(brown aluminum oxide sandblasting). 

The sample is sintered well, so the strength is obviously increased(black aluminium oxide). After different heat treatment temperatures, the flexural strength and compressive strength of sample A1 are basically higher than those of sample Ao. It is a process of volume expansion. Compared with sample Ao, sample A has a linear rate of change after heat treatment(aluminum oxide for sand blaster). As the heat treatment temperature increases, its linear rate of change becomes larger.(cheapest white corundum wholesale price australia)

After the heat treatment of 1600℃x4h, the linear change rate of sample A is the smallest(white fused alumina), which is 20%, while the linear change rate of sample A is the largest, is accompanied by the closed pores of ZrO2 aggregates, resulting in a significant decrease in the volume density of the sample and an increase in the porosity(aluminum oxide 40 grit). After heat treatment at 1100℃x4h, the linear rate of change of sample A is the smallest, and that of sample A maximum.

(cheapest white corundum wholesale price australia)This is probably because the free SiO2 in sample A decomposed at high temperature and reacted with Al2O3 in the base shield to become Cailaishi(pink corundum), and with the increase of heat treatment temperature, the amount of grassy stone increased and the grassy stone crystal grew Large, the resulting expansion is also large, resulting in the highest rate of linear change(white fused alumina for refractory), and the m-t phase transition is accompanied by a process of volume shrinkage.

For this reason, this is a process of decomposing free SiO2 from zoxinite at high temperature and reacting with Al2O3 in the matrix to form mullite(black corundum). It is lower, which may be due to the increase of CaO content in sample A, the increase of CA phase content in the castable, and the gradual decrease of CA6 phase content(aluminium oxide grit 24 mesh), so that the linear rate of change decreases, while the magnesium stabilized zirconium oxide introduced in sample A.(cheapest white corundum wholesale price australia)

The main reason for the improvement of the thermal shock resistance of sample A is that(brown fused alumina price), on the one hand, the residual tensile stress field around the particles after the ZrO2 phase transformation can induce the nucleation and propagation of matrix microcracks; which is as high as 182%. due to the difference in thermal expansion coefficient between ZrO2 and corundum(brown aluminum oxide blast media). The sample shows expansion after heat treatment.