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To solve the problems of slag entrapment risk and frequent bond alarm in the field application of mould flux for high-speed thin slab continuous casting, the idea of ‘non-Newtonian fluid mould flux with shear-thinning property’ is introduced. It was found that with an increase in the Al 2 O 3  content, the shear-thinning behaviour of the mould flux first increased and then decreased. The sample with 8.61% Al 2 O 3  content had the strongest shear-thinning property and the lowest fluidity index, which reached 0.75. With the addition of Al 2 O 3 , the degree of polymerization of the mould flux molecules increased, and the relative strength of the Si–O–Al bond increased. It was found that the Al 2 O 3  content has a significant influence on the  IV Al complexes. The XPS results showed that Q 3 (1Al) was the structural unit most easily affected by shear stress, and the higher the content of Q 3 (1Al), the stronger the shear-thinning property of the mould flux.

Effect of Al 2 O 3 on shear-thinning property of mould flux for high-speed thin slab continuous casting and its study on the mechanism