Sizes of Chromite flour has big influence on function of Mg-Cr brick
As we know,Mg-Cr brick mainly made of magnesia and chromite sand/flour.
Zhengzhou haixu abrasives co.,ltd,manufacturer of chromite sand/flour from China,we produce a wide range of chromite sand/flour as follows:
| Chromite sand | AFS25-30 AFS30-35 AFS35-40 AFS40-45 AFS40-50 AFS45-50 AFS45-55 AFS50-60 AFS60-70 etc |
| Chromite flour | 180mesh 200mesh 230mesh 270mesh 320mesh 400mesh 500mesh 600mesh 800mesh 1000mesh 1200mesh 1500mesh 1800mesh 2000mesh 2200mesh 2500mesh |
Then what inflence will have when use different sizes of chromite sand/flour ?
In short,there are 2 kinds:
1.When chromite sand is used, it is surrounded by finely dispersed magnesia. During firing, the number of ions diffusing from the chromite surface to the periclase is limited, resulting in cracks at the interface between the particles and the matrix, thereby improving the thermal shock stability of the material.
2.When chromite flour is used, the contact area between it and magnesia is large, and the ions diffuse fully during high-temperature sintering, forming a direct bond between high-refractory phases, improving high-temperature strength and corrosion resistance, but reducing thermal shock stability.
So when produce Mg-cr brick,the exact size of chromite should be considered.
